USRE42443E1 - Architecture for a universal serial bus-based PC flash disk - Google Patents
Architecture for a universal serial bus-based PC flash disk Download PDFInfo
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- USRE42443E1 USRE42443E1 US10/292,868 US29286802A USRE42443E US RE42443 E1 USRE42443 E1 US RE42443E1 US 29286802 A US29286802 A US 29286802A US RE42443 E USRE42443 E US RE42443E
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/14—Handling requests for interconnection or transfer
- G06F13/36—Handling requests for interconnection or transfer for access to common bus or bus system
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0628—Interfaces specially adapted for storage systems making use of a particular technique
- G06F3/0655—Vertical data movement, i.e. input-output transfer; data movement between one or more hosts and one or more storage devices
- G06F3/0661—Format or protocol conversion arrangements
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/38—Information transfer, e.g. on bus
- G06F13/382—Information transfer, e.g. on bus using universal interface adapter
- G06F13/385—Information transfer, e.g. on bus using universal interface adapter for adaptation of a particular data processing system to different peripheral devices
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0602—Interfaces specially adapted for storage systems specifically adapted to achieve a particular effect
- G06F3/0604—Improving or facilitating administration, e.g. storage management
- G06F3/0607—Improving or facilitating administration, e.g. storage management by facilitating the process of upgrading existing storage systems, e.g. for improving compatibility between host and storage device
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0668—Interfaces specially adapted for storage systems adopting a particular infrastructure
- G06F3/0671—In-line storage system
- G06F3/0673—Single storage device
- G06F3/0679—Non-volatile semiconductor memory device, e.g. flash memory, one time programmable memory [OTP]
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C7/00—Arrangements for writing information into, or reading information out from, a digital store
- G11C7/10—Input/output [I/O] data interface arrangements, e.g. I/O data control circuits, I/O data buffers
- G11C7/1006—Data managing, e.g. manipulating data before writing or reading out, data bus switches or control circuits therefor
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/72—Mobile telephones; Cordless telephones, i.e. devices for establishing wireless links to base stations without route selection
- H04M1/724—User interfaces specially adapted for cordless or mobile telephones
- H04M1/72403—User interfaces specially adapted for cordless or mobile telephones with means for local support of applications that increase the functionality
- H04M1/72409—User interfaces specially adapted for cordless or mobile telephones with means for local support of applications that increase the functionality by interfacing with external accessories
Definitions
- the present invention is related to semiconductor memory devices, and in particular to erasable and programmable nonvolatile memory modules which are connected to a host platform using the USB PC Bus.
- Flash memory Erasable and programmable non-volatile memory modules, hereinafter referred to as flash memory or flash devices, are known in the art for storage of information. Flash devices include electrically erasable and programmable read-only memories (EEPROMs) made of flash-type, floating-gate transistors and are non-volatile memories similar in functionality and performance to EPROM memories, with an additional functionality that allows an in-circuit, programmable, operation to erase pages of the memory.
- EEPROMs electrically erasable and programmable read-only memories
- flash-type, floating-gate transistors are non-volatile memories similar in functionality and performance to EPROM memories, with an additional functionality that allows an in-circuit, programmable, operation to erase pages of the memory.
- Flash devices have the advantage of being relatively inexpensive and requiring relatively little power as compared to traditional magnetic storage disks.
- it is not practical to rewrite a previously written area of the memory without a preceding page erase of the area.
- This limitation of flash devices causes them to be incompatible with typical existing operating system programs, since data cannot be written to an area of memory within the flash device in which data has previously. been written, unless the area is first erased.
- a software management system such as that disclosed in U.S. Pat. No. 5,404,485, filed on Mar. 5, 1993, which is incorporated as if fully set forth herein, is required to manage these functions of the flash memory device.
- USB standard offers a smaller form factor and greater ease of use for the end user, while lowering the cost of the implementation.
- This standard is specified to be an industry-wide standard promoted by companies such as Compaq Computer Corporation, Microsoft, IBM and Intel to serve as an extension to the PC architecture with a focus on Computer Telephony Integration (CTI), the consumer, and productivity applications.
- CTI Computer Telephony Integration
- USB universal trademark of Lucent Technologies Inc.
- This standard also offers protocol flexibility for mixed-mode isochronous data transfers and asynchronous messaging, integration in commodity device technology and provision of a standard interface for rapid integration into any given host product.
- the USB standard represents a single model for cabling and attaching connectors, such that all of the details of the electrical functions, including bus terminations, are isolated from the end user.
- the peripheral devices are self-identifying, and support automatic mapping of functions to a driver.
- the standard enables all peripheral devices to be dynamically attachable and re-configurable.
- USB interconnection is the manner in which USB devices are connected to, and communicate with, the host platform.
- the associated functions and components include the bus topology, which is the connection model between USB devices and the host platform.
- the USB physical interconnection has a tiered star topology.
- a hub is at the center of each star.
- Each wire segment is a point-to-point connection between the host platform and a hub or function, or a hub connected to another hub or function.
- the USB tasks which are performed at each layer in the system include a data flow model and a schedule.
- a data flow model is the manner in which data moves in the system over the USB between data producers and data consumers.
- a schedule determines access to the interconnection, which is shared. Such scheduling enables isochronous data transfers to be supported and eliminates arbitration overhead.
- the USB itself is a polled bus.
- the host controller on the host platform initiates all data transfers. All bus transactions involve the transmission of up to three packets. Each transaction begins when the host controller, on a scheduled basis, sends a USB packet describing the type and direction of transaction, the USB device address, and endpoint number. This packet is referred to as the “token packet.”
- the USB device to which the packet is addressed, selects itself by decoding the appropriate address fields.
- data is transferred either from the host platform to a device or from a device to the host platform.
- the direction of data transfer is specified in the token packet.
- the source of the transaction then sends a data packet or indicates that the source has no data to transfer.
- the destination in general, responds with a handshake packet indicating whether the transfer was successful.
- the USB data transfer model between a source and destination on the host platform and an endpoint on a device is referred to as a “pipe”.
- Stream data has no USB-defined structure, while message data does. Additionally, pipes have associations of data bandwidth, transfer service type, and endpoint characteristics like directionality and buffer sizes. Most pipes come into existence when a USB device is configured.
- the transaction schedule for the USB standard permits flow control for some stream pipes. At the hardware level, this prevents situations in which buffers experience underrun or overrun, by using a NAK handshake to throttle the data rate. With the NAK handshake, a transaction is retried when bus time is available.
- the flow control mechanism permits the construction of flexible schedules which accommodate concurrent servicing of a heterogeneous mix of stream pipes. Thus, multiple stream pipes can be serviced at different intervals with packets of different sizes.
- the USB standard as described, has three main types of packets, including token packets, data packets and handshake packets.
- An example of each type of packet is shown in background art FIGS. 1-3 .
- Background art FIG. 4 shows an exemplary USB abstract device.
- a token packet 10 features a PID (packet identification) field 12 , specifying one of three packet types: IN, OUT, or SETUP. If PID field 12 specifies the IN packet type, the data transaction is defined from a function to the host platform. If PID field 12 specifies the OUT or SETUP packet type, the data transaction is defined from the host platform to a function.
- PID packet identification
- An ADDR field 14 specifies the address, while an ENDP field 16 specifies the endpoint for token packet 10 .
- PID field 12 specifies that token packet 10 is an OUT packet type or a SETUP packet type
- ADDR field 14 and ENDP field 16 uniquely identify the endpoint for receiving the subsequent data packet, shown in FIG. 2 , which follows after token packet 10 .
- PID field 12 specifies that token packet 10 is an IN packet type
- ADDR field 14 and ENDP field 16 uniquely identify which endpoint should transmit a data packet.
- a CRC 5 field 18 contains the checksum, for determining that token packet 10 has been received without corruption. Only host platform can issue token packets 10 , such that token packets 10 provide control over transmission of the subsequent data packets.
- a background art USB data packet 20 also features a PID (packet identification) field 22 for identifying the type of data packet.
- Data packet 20 also features a data field 24 for optionally. containing data, and a CRC field 26 for containing the checksum as previously described.
- FIG. 3 shows a background art USB handshake packet 28 , which features only a PID (packet identification) field 30 .
- Handshake packets 28 are used to report the status of a data transaction and can return values indicating successful reception of data, command acceptance or rejection, flow control, and halt conditions. Only transaction types which support flow control can return handshake packets 28 . Handshake packets 28 are always returned in the handshake phase of a transaction and may be returned, instead of data packets 20 , in the data phase of a transaction.
- USB device 32 typically includes a USB electrical interface 34 , featuring a cable and a connector, which is a physical interface for receiving and transmitting electrical signals which are compatible with the USB specification as previously described.
- the signals are then passed to a logical interface 36 , which includes one or more buffers, the device address decoder for decoding the address of the source device for the signals, and a SYNC field synchronizer for synchronizing the signals.
- Information and structures required for management of USB abstract device 32 as a USB device are stored in a USB class control and enumeration engine 38 .
- a function and device engine 40 also termed the “application”, controls and manages the specific functions and properties of USB abstract device 32 .
- function and device engine 40 also consumes and produces most of the data over the USB bus.
- USB specification does not define the relationship between different entities in USB abstract device 32 , however. Rather, the USB specification describes only the requirements for the packets, and for the electrical and physical connection between USB abstract device 32 and the bus. Therefore the connections and relationships shown in background art FIG. 4 are only one example of an implementation which fulfills the requirements of the USB specification. Thus, any specific device for fulfilling the USB specification must have a specifically defined and described architecture.
- FIG. 1 is a schematic block diagram of a background art USB token packet structure
- FIG. 2 is a schematic block diagram of a background art USB data packet structure
- FIG. 3 is a schematic block diagram of a background art USB handshake data packet structure
- FIG. 4 is a schematic block diagram of an exemplary background art USB device
- FIG. 5 is a schematic block diagram of a system with a flash USB device functionality according to the present invention.
- FIG. 6 is a schematic block diagram of the USB Flash disk
- FIG. 7 is a schematic block diagram of a flash identification request packet
- FIG. 8 is a schematic block diagram of a flash identification status packet
- FIG. 9 is a schematic block diagram of a flash write request packet
- FIG. 10 is a schematic block diagram of a flash write status packet
- FIG. 11 is a schematic block diagram of a flash read request packet
- FIG. 12 is sa schematic block diagram of a flash read status packet
- FIG. 13 is a schematic block diagram of a flash erase request packet
- FIG. 14 is a schematic block diagram of a flash erase status packet.
- the present invention is of a flash memory device, containing one or more flash modules, in which the flash memory is mapped to the address space of an ASIC or a controller which has a USB-defined electrical interface and a USB-defined logical interface.
- This controller/ASIC (hereinafter termed a “controller”) supports the USB functionality according to the USB standard, thereby supporting enumeration onto the USB bus, as well as data reception and transmission over USB pipes to and from USB endpoints.
- This controller also supports the functionality and control of the flash memory device, as well as the processing of command and data packets from the host controller.
- the host controller uses one of several possible protocols, either standard or proprietary, to signal the next command to be performed to the USB flash controller.
- the entire device acts as a dynamically attachable/detachable non-volatile storage device for the host platform.
- a USB flash memory device for connecting to a USB-defined bus
- the flash memory device comprising: (a) at least one flash memory module for storing data; (b) a USB connector for connecting to the USB-defined bus and for sending packets on, and for receiving packets from, the USB-defined bus; and (c) a USB controller for controlling the at least one flash memory module and for controlling the USB connector according to at least one packet received from the USB-defined bus, such that data is written to and read from the at least one flash memory module.
- computer includes, but is not limited to, personal computers (PC) having an operating system such as DOS, WindowsTM, OS/2TM or Linux; MacintoshTM computers; computers having JAVATM-OS as the operating system; and graphical workstations such as the computers of Sun MicrosystemsTM and Silicon GraphicsTM, and other computers having some version of the UNIX operating system such as AIXTM or SOLARISTM of Sun MicrosystemsTM; or any other known and available operating system, including operating systems such as Windows CETM for embedded systems, including cellular telephones, handheld computational devices and palmtop computational devices, and any other computational device which can be connected to a network.
- PC personal computers
- an operating system such as DOS, WindowsTM, OS/2TM or Linux
- MacintoshTM computers computers having JAVATM-OS as the operating system
- graphical workstations such as the computers of Sun MicrosystemsTM and Silicon GraphicsTM
- AIXTM or SOLARISTM of Sun MicrosystemsTM or any other known and available operating system, including operating systems such as Windows CETM
- WindowsTM includes but is not limited to Windows95TM, Windows 3.XTM in which “x” is an integer such as “1”, Windows NTTM, Windows98TM, Windows CETM and any upgraded versions of these operating systems by Microsoft Inc. (Seattle, Wash., USA).
- the present invention is of a flash memory device, containing one or more flash modules, in which the flash memory is mapped to the address space of an ASIC or a controller which has a USB-defined electrical interface and a USB-defined logical interface.
- This controller/ASIC (hereinafter termed a “controller”) supports the USB functionality according to the USB standard, thereby supporting enumeration onto the USB bus, as well as data reception and transmission over USB pipes to and from USB endpoints.
- This controller also supports the functionality and control of the flash memory device, as well as the processing of command and data packets from the host controller.
- the host controller uses one of several possible protocols, either standard or proprietary, to signal the next command to be performed to the USB flash controller.
- the entire device acts as a dynamically attachable/detachable non-volatile storage device for the host platform.
- USB flash device and system may be better understood with reference to the drawings and the accompanying description, it being understood that these drawings are given for illustrative purposes only and are not meant to be limiting.
- FIG. 5 is a schematic block diagram of the main components of a flash memory device and system according to the present invention.
- a flash memory system 42 includes a host platform 44 as shown.
- Host platform 44 operates USB flash device 46 as a non-volatile storage space.
- Host platform 44 is connected to USB flash device 46 according to the present invention through a USB cable 48 .
- Host platform 44 connects to USB cable 48 through a USB host connector 50
- USB flash device 46 connects to USB cable 48 through a USB flash device connector 52 .
- Host platform 44 features a USB host controller 54 for controlling and managing all USB transfers on the USB bus.
- USB flash device 46 features a USB flash device controller 56 for controlling the other components of USB flash device 46 and for providing an interface for USB flash device 46 to the USB bus, USB flash device connector 52 and at least one flash memory module 58 .
- Flash memory module 58 is preferably an array of flash memory modules 58 in which the data is stored.
- USB flash device 46 Whenever USB flash device 46 becomes connected to host platform 44 , a standard USB enumeration process takes place. In this process host platform 44 configures USB flash device 46 and the mode of communication with USB flash device 46 . Although there are many different methods for configuring USB flash device 46 , for the purposes of clarity only and without intending to be limiting, the present invention is explained in greater detail below with regard to a method in which host platform 44 issues commands and requests to USB flash device 46 through one endpoint. Host platform 44 queries USB flash device 46 through the other endpoint for status changes, and receives related packets if any such packets are waiting to be received.
- Host platform 44 requests services from USB flash device 46 by sending request packets to USB host controller 54 .
- USB host controller 54 transmits packets on USB cable 48 .
- These requests are received by USB flash device controller 56 when USB flash device 46 is the device on the endpoint of the request.
- USB flash device controller 56 then performs various operations such as reading, writing or erasing data from or to flash memory module(s) 58 , or supporting basic USB functionality such as device enumeration and configuration.
- USB flash device controller 56 controls flash memory module(s) 58 by using a control line 60 to control the power of flash memory module(s) 58 , and also through various other signals such as chip enable, and read and write signals for example.
- Flash memory module(s) 58 are also connected to USB flash device controller 56 by an address/data bus 62 .
- Address/data bus 62 transfers commands for performing read, write or erase commands on flash memory module(s) 58 , as well as the addresses and data for these commands as defined by the manufacturer of flash memory module(s) 58 .
- USB flash device 46 In order for USB flash device 46 to notify host platform 44 on the result and status for different operations requested by host platform 44 , USB flash device 46 transmits status packets using the “status end point”. According to this procedure, host platform 44 checks (polls) for status packets and USB flash device 46 returns either an empty packet if no packets for new status messages are present, or alternatively returns the status packet itself.
- USB flash device 46 includes the physical and electrical interface defined for the USB standard, shown here as USB flash device connector 52 and a connector interface 64 .
- USB flash device connector 52 receives the electrical signals from USB cable 48 which carries electrical signals from host controller (not shown). These signals are then passed through connector interface 64 . Every millisecond, a USB frame is carried on the USB-defined bus, such that packets could be sent to USB flash device 46 .
- Connector interface 64 then receives these packets through a first interface component, which is a combined physical and logical interface 66 .
- a functional interface 68 is specifically designed to receive token packets as defined in the USB specification and as previously described with regard to FIG. 1 . These token packets are related only to particular functional aspects of USB flash device 46 which are required for the USB standard, and do not have any relation to particular application of USB flash device 46 as a flash disk according to the present invention. These token packets and their respective returned data packets enable USB host controller 54 (not shown) and host platform 44 (not shown) to identify USB flash device 46 and allocate resources for USB flash device 46 on the USB bus. Thus, functional interface 68 only supports USB functionality needed for the identification and registration of USB flash device 46 on the USB bus.
- USB flash device 46 also features an application packet extractor 70 which extracts the application data and commands from the USB application packets, such that application packet extractor 70 supports only application related packets.
- any requests to USB flash device 46 by host platform 44 in the form of read, write, identify and erase commands, are interpreted by an application command interpreter 72 .
- an address resolve module 74 translates the address from the logical address space to the physical address space.
- Host platform 44 (not shown) relates to a linear address space of logical addresses, while USB flash device 46 contains at least one, and preferably a plurality of, flash modules 58 , each of which has a physical address space.
- a translation must be performed between the logical address space of host platform 44 (not shown) and physical address space or spaces of USB flash device 46 .
- There are many ways to implement such a translation which are suitable for the present invention.
- One example of a suitable implementation of an address translation method is described with regard to U.S. Pat. No. 5,404,485, previously incorporated by reference as if fully set forth herein, which teaches a method for managing a flash memory as a flash disk and which is suitable for operation with the present invention.
- a data handler 76 handles data related aspects of any received commands, and conveying the data through functional interface 68 to and from flash module(s) 58 .
- data handler 76 performs any error correction and detection methods.
- Application command interpreter 72 , data handler 76 and address resolve module 74 all operate with an underlying Memory Technology Driver (MTD) 78 to write, read or erase a particular flash module 58 and the desired address on that flash module 58 .
- MTD Memory Technology Driver
- Host platform 44 checks for status changes in USB flash device 46 and reads status packets from USB flash device 46 when a new status packet is available. Using these status packets, USB flash device 46 can transmit, to host platform 44 , the results of different commands issued by host platform 44 in its requests (not shown).
- the read command status packet contains one of the available status words such as “success”, “error” or “invalid address”, which enables host-platform 44 to determine the result of the read command (not shown).
- the erase status packet contains a status word indicating the completion of the erase process.
- a write status packet is used by USB flash device 46 to notify host platform 44 about the result of the write command, for example whether the command was successful or erroneous, and whether USB flash device 46 is ready for additional write requests from host platform 44 .
- a Memory Technology Driver, or MTD 78 typically contains routines to read, write and erase the flash memory device controlled by the controller operating MTD 78 .
- MTD 78 optionally contains an identification routine for recognizing the proper type of flash memory device for which MTD 78 was designed, so that the controller can determine which MTD should be activated upon interacting with a particular flash memory device array.
- an identification routine should be able to detect the size of the array of flash memory devices, including the number of flash memory devices within the array, and various features of the flash array geometry, such as interleaving and bus width. This information later enables host platform 44 platform to determine the address space and size of the storage media.
- U.S. Pat. No. 5,799,168 previously incorporated by reference, discloses an example of such an MTD for a flash device.
- host platform 44 can optionally implement any application which is implementable with any regular memory mapped or I/O mapped flash memory device.
- host platform 44 can give a standard block device interface to each application, such as a magnetic storage medium “hard disk” drive, as disclosed in the previously described U.S. Pat. No. 5,404,485.
- the operation of a host system connected to a USB flash device is described with regard to the processes of identifying, programming, reading and erasing the flash device.
- the exemplary USB flash device has an array of two flash memory modules, each of which is 64 Mbit in size.
- the address translation table is within the flash device so that host platform operates with logical addresses. All commands and return codes between the flash device and the host platform are carried on USB data packets, and are transferred through USB data pipes. The exact structure of the packets, pipes and timings are described in the USB specification.
- the USB flash device When the USB flash device is first connected to the host platform, the USB host controller assigns an address to the USB flash device on the USB bus, and also assigns resources as described in the USB specification. The USB flash device actually asks the host platform to assign these resources, and must inform the host platform how much of these resources are needed.
- the USB flash disk can optionally support slower device speeds if the USB host platform has already allocated resources to other devices.
- the USB controller also negotiates with the flash modules and determines the size and manufacturing type of these modules. The controller then builds an identification structure holding this information, as well as the translation table and logical address space.
- the host platform After the USB host controller identifies the USB flash device, the host platform often uploads a USB client driver.
- the driver issues an identification request command to the USB host controller, causing the controller to transmit an identification data packet 80 , shown in FIG. 7 .
- Identification packet 80 contains PID field 22 and checksum field 26 , as described previously for background art FIG. 2 .
- Identification packet 80 also contains an “identify” operation code in an operation code field 82 .
- the packet extractor of the USB flash device receives identification data packet 80 and transfers the operating code of the “identify” command to the application command interpreter.
- identification data packet 84 In response to the “identify” command, the flash device then sends an identification data packet 84 , shown in FIG. 8 .
- identification data packet 84 also contains information about the size of the flash device in a flash device size field 86 , as well as information about the size of the minimal erase unit for erasing the flash memory in an erase unit size field 88 .
- All of the packets described in this example are only data packets which are sent on the USB bus.
- a USB token packet is transmitted, instructing the USB controller as to the identity of the device end point to which the data packet should be transmitted.
- the USB controller Upon successful reception of the packet, the USB controller issues a USB ACK packet as described in the USB specification.
- a write data packet 90 is shown in FIG. 9 , which again includes the fields shown previously in FIG. 8 , except that write data packet 90 also includes a write field 92 with the “write” operational code; an ADDR field 94 with the logical address to be written; a LEN field 96 with the length to be written; and a DATA field 98 which contains the actual data to write.
- the packet extractor extracts the operational code from write data packet 90 and transfers this code to the application command interpreter.
- the logical address is transferred to the address resolve module which translates this logical address to a physical address on one of the flash modules.
- the data handler optionally calculates error correction and detection mechanisms if employed by the USB flash device.
- a “write” command is sent to the flash module or modules containing the physical address, which may optionally span across more than one flash module to the MTD block.
- the MTD block then issues a “write” command on the data/address bus which connects the flash modules to the USB device controller.
- write status packet 100 contains a status field 102 .
- the host platform reads the status packets from the flash memory device, and from write status packet 100 , the host platform retrieves information on the completion status of the write command by reading status field 102 .
- the flash memory device repeats ADDR field 94 and LEN field 96 in order for the host platform to have a reference to the specific command related to status packet 100 .
- a “read request” packet 104 contains the operation code for the “read” command in a read field 106 , and the logical address of the desired location from which the flash controller should read in an ADDR field 108 .
- the flash controller issues a read command to the MTD block, after the address resolve module has translated the address contained in ADDR field 108 to a specific physical address in one of the flash components.
- the flash controller When the flash controller receives the data from the flash device, either after the read command was issued, or if an error occurred, the flash controller sends a signal to the host platform to indicate that a new status packet must be read.
- the host platform issues a read request and receives a “read status” packet 110 as shown in FIG. 12 .
- Read status packet 110 contains the address of the read data in ADDR field 108 , as well as the length of the read data in a LEN field 112 and the data itself in a data field 114 .
- Read status packet 110 also features the status word, according to which the operation was completed, in a status field 116 . The read operation can be completed with many different status situations such as success, fail, error detected, invalid address, invalid length and so forth.
- the host platform When the host platform needs to erase an erase unit in the flash device, the host platform issues an “erase request” packet 118 , shown in FIG. 13 .
- This packet contains the “erase” operation code in an erase field 120 , and the logical address of the erase unit in an ADDR field 122 .
- the flash controller Upon receiving such a request, the flash controller translates the logical address to a physical erase unit address on one of the physical address spaces of the flash modules, and issues an erase command to the MTD block.
- the erase process generally takes more time then a read or write process.
- the controller notifies the host platform a new status packet is ready to transmit.
- the controller then transmits an “erase status” packet 124 , as shown in FIG. 14 .
- Erase status packet 124 contains the address of the erased unit in ADDR field 122 , thereby providing the host platform with a reference to the erase requests.
- the status according to which the operation was completed is provided in a status field 126 .
Abstract
A storage unit made of flash array and a USB controller, is implemented to be compatible with then the USB specification. The unit includes memory modules which can accept write commands and read commands and are erasable and non-volatile herein referred to as flash modules. The USB/flash controller is configured to provide USB functionality and compatibility alone along with common flash operations such as programming reading and erasing the above mentioned components.
Description
This application is a reissue application of U.S. Ser. No. 09/285,706 filed on Apr. 5, 1999, now U.S. Pat. No. 6,148,354 issued on Nov. 14, 2000. More than one reissue application has been filed for the reissue of U.S. Pat. No. 6,148,354. The reissue applications are application Ser. Nos. 10/292,868 (the present application), and 10/293,986 which is a continuation of the present application.
The present invention is related to semiconductor memory devices, and in particular to erasable and programmable nonvolatile memory modules which are connected to a host platform using the USB PC Bus.
Erasable and programmable non-volatile memory modules, hereinafter referred to as flash memory or flash devices, are known in the art for storage of information. Flash devices include electrically erasable and programmable read-only memories (EEPROMs) made of flash-type, floating-gate transistors and are non-volatile memories similar in functionality and performance to EPROM memories, with an additional functionality that allows an in-circuit, programmable, operation to erase pages of the memory. One example of an implementation of such a flash device is given in U.S. Pat. No. 5,799,168, incorporated by reference as if fully set forth herein.
Flash devices have the advantage of being relatively inexpensive and requiring relatively little power as compared to traditional magnetic storage disks. However, in a flash device, it is not practical to rewrite a previously written area of the memory without a preceding page erase of the area. This limitation of flash devices causes them to be incompatible with typical existing operating system programs, since data cannot be written to an area of memory within the flash device in which data has previously. been written, unless the area is first erased. A software management system, such as that disclosed in U.S. Pat. No. 5,404,485, filed on Mar. 5, 1993, which is incorporated as if fully set forth herein, is required to manage these functions of the flash memory device.
Currently, these flash memory devices have a second limitation, which is that they must be either attached statically to the host platform, or attached and detached dynamically using the PCMCIA [Personal Computer Memory Card International Association] interface. Both implementations have drawbacks, including difficulty of use and high cost.
A more useful implementation would follow the USB standard, as described in the USB Specification Version 1.1 which is incorporated as if fully set forth herein. The USB standard offers a smaller form factor and greater ease of use for the end user, while lowering the cost of the implementation. This standard is specified to be an industry-wide standard promoted by companies such as Compaq Computer Corporation, Microsoft, IBM and Intel to serve as an extension to the PC architecture with a focus on Computer Telephony Integration (CTI), the consumer, and productivity applications.
The criteria which were applied to define the architecture for the USB standard include the ease of PC (personal computer) peripheral expansion, low cost, support of transfer rates up to 12 Mb/second and full support for real-time data, voice, audio, and compressed video. This standard also offers protocol flexibility for mixed-mode isochronous data transfers and asynchronous messaging, integration in commodity device technology and provision of a standard interface for rapid integration into any given host product. In addition, the USB standard represents a single model for cabling and attaching connectors, such that all of the details of the electrical functions, including bus terminations, are isolated from the end user. Through the standard, the peripheral devices are self-identifying, and support automatic mapping of functions to a driver. Furthermore, the standard enables all peripheral devices to be dynamically attachable and re-configurable.
A system constructed according to the USB standard is described by three separate, defined areas: USB interconnection, USB devices and the USB host platform. The USB interconnection is the manner in which USB devices are connected to, and communicate with, the host platform. The associated functions and components include the bus topology, which is the connection model between USB devices and the host platform.
The USB physical interconnection has a tiered star topology. A hub is at the center of each star. Each wire segment is a point-to-point connection between the host platform and a hub or function, or a hub connected to another hub or function.
In terms of a capability stack, the USB tasks which are performed at each layer in the system include a data flow model and a schedule. A data flow model is the manner in which data moves in the system over the USB between data producers and data consumers. A schedule determines access to the interconnection, which is shared. Such scheduling enables isochronous data transfers to be supported and eliminates arbitration overhead.
The USB itself is a polled bus. The host controller on the host platform initiates all data transfers. All bus transactions involve the transmission of up to three packets. Each transaction begins when the host controller, on a scheduled basis, sends a USB packet describing the type and direction of transaction, the USB device address, and endpoint number. This packet is referred to as the “token packet.” The USB device, to which the packet is addressed, selects itself by decoding the appropriate address fields. In a given transaction, data is transferred either from the host platform to a device or from a device to the host platform. The direction of data transfer is specified in the token packet. The source of the transaction then sends a data packet or indicates that the source has no data to transfer. The destination, in general, responds with a handshake packet indicating whether the transfer was successful.
The USB data transfer model between a source and destination on the host platform and an endpoint on a device is referred to as a “pipe”. There are two types of pipes: stream and message. Stream data has no USB-defined structure, while message data does. Additionally, pipes have associations of data bandwidth, transfer service type, and endpoint characteristics like directionality and buffer sizes. Most pipes come into existence when a USB device is configured. One message pipe, the default control pipe, always exists once a device is powered, in order to provide access to the configuration, status, and control information for the device.
The transaction schedule for the USB standard permits flow control for some stream pipes. At the hardware level, this prevents situations in which buffers experience underrun or overrun, by using a NAK handshake to throttle the data rate. With the NAK handshake, a transaction is retried when bus time is available. The flow control mechanism permits the construction of flexible schedules which accommodate concurrent servicing of a heterogeneous mix of stream pipes. Thus, multiple stream pipes can be serviced at different intervals with packets of different sizes.
The USB standard, as described, has three main types of packets, including token packets, data packets and handshake packets. An example of each type of packet is shown in background art FIGS. 1-3 . Background art FIG. 4 shows an exemplary USB abstract device.
A token packet 10, as shown in background art FIG. 1 , features a PID (packet identification) field 12, specifying one of three packet types: IN, OUT, or SETUP. If PID field 12 specifies the IN packet type, the data transaction is defined from a function to the host platform. If PID field 12 specifies the OUT or SETUP packet type, the data transaction is defined from the host platform to a function.
An ADDR field 14 specifies the address, while an ENDP field 16 specifies the endpoint for token packet 10. For OUT and SETUP transactions, in which PID field 12 specifies that token packet 10 is an OUT packet type or a SETUP packet type, ADDR field 14 and ENDP field 16 uniquely identify the endpoint for receiving the subsequent data packet, shown in FIG. 2 , which follows after token packet 10. For IN transactions, in which PID field 12 specifies that token packet 10 is an IN packet type, ADDR field 14 and ENDP field 16 uniquely identify which endpoint should transmit a data packet. A CRC5 field 18 contains the checksum, for determining that token packet 10 has been received without corruption. Only host platform can issue token packets 10, such that token packets 10 provide control over transmission of the subsequent data packets.
As shown in background art FIG. 2 , a background art USB data packet 20 also features a PID (packet identification) field 22 for identifying the type of data packet. Data packet 20 also features a data field 24 for optionally. containing data, and a CRC field 26 for containing the checksum as previously described.
Background art FIG. 3 shows a background art USB handshake packet 28, which features only a PID (packet identification) field 30. Handshake packets 28 are used to report the status of a data transaction and can return values indicating successful reception of data, command acceptance or rejection, flow control, and halt conditions. Only transaction types which support flow control can return handshake packets 28. Handshake packets 28 are always returned in the handshake phase of a transaction and may be returned, instead of data packets 20, in the data phase of a transaction.
These three different types of packets are exchanged during various phases of the transaction which includes a USB device. A schematic block diagram of the functional blocks in a typical USB device 32 is shown in FIG. 4 for an abstract background art USB device. USB device 32 typically includes a USB electrical interface 34, featuring a cable and a connector, which is a physical interface for receiving and transmitting electrical signals which are compatible with the USB specification as previously described. The signals are then passed to a logical interface 36, which includes one or more buffers, the device address decoder for decoding the address of the source device for the signals, and a SYNC field synchronizer for synchronizing the signals. Information and structures required for management of USB abstract device 32 as a USB device are stored in a USB class control and enumeration engine 38. A function and device engine 40, also termed the “application”, controls and manages the specific functions and properties of USB abstract device 32. In addition, function and device engine 40 also consumes and produces most of the data over the USB bus.
The USB specification does not define the relationship between different entities in USB abstract device 32, however. Rather, the USB specification describes only the requirements for the packets, and for the electrical and physical connection between USB abstract device 32 and the bus. Therefore the connections and relationships shown in background art FIG. 4 are only one example of an implementation which fulfills the requirements of the USB specification. Thus, any specific device for fulfilling the USB specification must have a specifically defined and described architecture.
Unfortunately, no such architecture exists for a flash memory device containing one or more flash memory modules, which would enable the flash memory device to connect to a bus defined according to the USB specification and thereby to form part of a USB system on a host platform. For example, U.S. Pat. No. 5,799,168 does not teach or suggest such an implementation for the flash device. As mentioned previously, such an architecture would be particularly useful for a number of reasons, including low cost, ease of use and transparency to the end user.
There is thus a need for, and it would be useful to have, an architecture for defining and describing a flash memory device which is compatible with a USB system and which follows the USB specification, such that the flash memory device could sit on a USB-defined bus and communicate with the host platform through this bus.
The present invention is of a flash memory device, containing one or more flash modules, in which the flash memory is mapped to the address space of an ASIC or a controller which has a USB-defined electrical interface and a USB-defined logical interface. This controller/ASIC (hereinafter termed a “controller”) supports the USB functionality according to the USB standard, thereby supporting enumeration onto the USB bus, as well as data reception and transmission over USB pipes to and from USB endpoints. This controller also supports the functionality and control of the flash memory device, as well as the processing of command and data packets from the host controller. The host controller uses one of several possible protocols, either standard or proprietary, to signal the next command to be performed to the USB flash controller. Thus, the entire device acts as a dynamically attachable/detachable non-volatile storage device for the host platform.
According to the present invention, there is provided a USB flash memory device for connecting to a USB-defined bus, the flash memory device comprising: (a) at least one flash memory module for storing data; (b) a USB connector for connecting to the USB-defined bus and for sending packets on, and for receiving packets from, the USB-defined bus; and (c) a USB controller for controlling the at least one flash memory module and for controlling the USB connector according to at least one packet received from the USB-defined bus, such that data is written to and read from the at least one flash memory module.
Hereinafter, the term “computer” includes, but is not limited to, personal computers (PC) having an operating system such as DOS, Windows™, OS/2™ or Linux; Macintosh™ computers; computers having JAVA™-OS as the operating system; and graphical workstations such as the computers of Sun Microsystems™ and Silicon Graphics™, and other computers having some version of the UNIX operating system such as AIX™ or SOLARIS™ of Sun Microsystems™; or any other known and available operating system, including operating systems such as Windows CE™ for embedded systems, including cellular telephones, handheld computational devices and palmtop computational devices, and any other computational device which can be connected to a network. Hereinafter, the term “Windows™” includes but is not limited to Windows95™, Windows 3.X™ in which “x” is an integer such as “1”, Windows NT™, Windows98™, Windows CE™ and any upgraded versions of these operating systems by Microsoft Inc. (Seattle, Wash., USA).
The present invention is of a flash memory device, containing one or more flash modules, in which the flash memory is mapped to the address space of an ASIC or a controller which has a USB-defined electrical interface and a USB-defined logical interface. This controller/ASIC (hereinafter termed a “controller”) supports the USB functionality according to the USB standard, thereby supporting enumeration onto the USB bus, as well as data reception and transmission over USB pipes to and from USB endpoints. This controller also supports the functionality and control of the flash memory device, as well as the processing of command and data packets from the host controller. The host controller uses one of several possible protocols, either standard or proprietary, to signal the next command to be performed to the USB flash controller. Thus, the entire device acts as a dynamically attachable/detachable non-volatile storage device for the host platform.
While the invention is susceptible to various modifications and can be implemented using many alternative forms, the embodiment is shown by way of example in the drawings and will be described in details in the following pages. It should be understood that one of ordinary skill in the art appreciates that the present invention could be implemented in various other ways. The intention is to cover all modifications and alternatives falling within the spirit of the current invention.
The principles and operation of a USB flash device and system according to the present invention may be better understood with reference to the drawings and the accompanying description, it being understood that these drawings are given for illustrative purposes only and are not meant to be limiting.
Referring now to the drawings, FIG. 5 is a schematic block diagram of the main components of a flash memory device and system according to the present invention. A flash memory system 42 includes a host platform 44 as shown. Host platform 44 operates USB flash device 46 as a non-volatile storage space.
Whenever USB flash device 46 becomes connected to host platform 44, a standard USB enumeration process takes place. In this process host platform 44 configures USB flash device 46 and the mode of communication with USB flash device 46. Although there are many different methods for configuring USB flash device 46, for the purposes of clarity only and without intending to be limiting, the present invention is explained in greater detail below with regard to a method in which host platform 44 issues commands and requests to USB flash device 46 through one endpoint. Host platform 44 queries USB flash device 46 through the other endpoint for status changes, and receives related packets if any such packets are waiting to be received.
In order for USB flash device 46 to notify host platform 44 on the result and status for different operations requested by host platform 44, USB flash device 46 transmits status packets using the “status end point”. According to this procedure, host platform 44 checks (polls) for status packets and USB flash device 46 returns either an empty packet if no packets for new status messages are present, or alternatively returns the status packet itself.
A more detailed structure of the functional components of USB flash device 46 is shown in FIG. 6 . USB flash device 46 includes the physical and electrical interface defined for the USB standard, shown here as USB flash device connector 52 and a connector interface 64. USB flash device connector 52 receives the electrical signals from USB cable 48 which carries electrical signals from host controller (not shown). These signals are then passed through connector interface 64. Every millisecond, a USB frame is carried on the USB-defined bus, such that packets could be sent to USB flash device 46.
A data handler 76 handles data related aspects of any received commands, and conveying the data through functional interface 68 to and from flash module(s) 58. Optionally and preferably, data handler 76 performs any error correction and detection methods. Application command interpreter 72, data handler 76 and address resolve module 74 all operate with an underlying Memory Technology Driver (MTD) 78 to write, read or erase a particular flash module 58 and the desired address on that flash module 58.
A Memory Technology Driver, or MTD 78 typically contains routines to read, write and erase the flash memory device controlled by the controller operating MTD 78. In addition, MTD 78 optionally contains an identification routine for recognizing the proper type of flash memory device for which MTD 78 was designed, so that the controller can determine which MTD should be activated upon interacting with a particular flash memory device array. In addition, an identification routine should be able to detect the size of the array of flash memory devices, including the number of flash memory devices within the array, and various features of the flash array geometry, such as interleaving and bus width. This information later enables host platform 44 platform to determine the address space and size of the storage media. U.S. Pat. No. 5,799,168, previously incorporated by reference, discloses an example of such an MTD for a flash device.
Using the above described protocol and architecture, host platform 44 can optionally implement any application which is implementable with any regular memory mapped or I/O mapped flash memory device. For example, host platform 44 can give a standard block device interface to each application, such as a magnetic storage medium “hard disk” drive, as disclosed in the previously described U.S. Pat. No. 5,404,485.
As an example of a preferred embodiment of the present invention, the operation of a host system connected to a USB flash device according to the present invention is described with regard to the processes of identifying, programming, reading and erasing the flash device. For the purposes of illustration only and without intending to be limiting in any way, the exemplary USB flash device has an array of two flash memory modules, each of which is 64 Mbit in size. The address translation table is within the flash device so that host platform operates with logical addresses. All commands and return codes between the flash device and the host platform are carried on USB data packets, and are transferred through USB data pipes. The exact structure of the packets, pipes and timings are described in the USB specification.
The operation of the exemplary device and system according to the present invention is as follows. When the USB flash device is first connected to the host platform, the USB host controller assigns an address to the USB flash device on the USB bus, and also assigns resources as described in the USB specification. The USB flash device actually asks the host platform to assign these resources, and must inform the host platform how much of these resources are needed. Thus, the USB flash disk can optionally support slower device speeds if the USB host platform has already allocated resources to other devices.
The USB controller also negotiates with the flash modules and determines the size and manufacturing type of these modules. The controller then builds an identification structure holding this information, as well as the translation table and logical address space.
After the USB host controller identifies the USB flash device, the host platform often uploads a USB client driver. The driver issues an identification request command to the USB host controller, causing the controller to transmit an identification data packet 80, shown in FIG. 7 . Identification packet 80 contains PID field 22 and checksum field 26, as described previously for background art FIG. 2 . Identification packet 80 also contains an “identify” operation code in an operation code field 82. The packet extractor of the USB flash device receives identification data packet 80 and transfers the operating code of the “identify” command to the application command interpreter.
In response to the “identify” command, the flash device then sends an identification data packet 84, shown in FIG. 8 . In addition to the fields shown in FIG. 7 , identification data packet 84 also contains information about the size of the flash device in a flash device size field 86, as well as information about the size of the minimal erase unit for erasing the flash memory in an erase unit size field 88.
All of the packets described in this example are only data packets which are sent on the USB bus. Before each data packet is sent, a USB token packet is transmitted, instructing the USB controller as to the identity of the device end point to which the data packet should be transmitted. Upon successful reception of the packet, the USB controller issues a USB ACK packet as described in the USB specification.
Once the device drivers in the host platform receive this status packet, the drivers can start issuing read and write commands to the USB flash device with the application commands. When a write request is sent, a USB data packet with the operation code for the “write” command, and the buffer containing the data, is transferred to the USB flash device. A write data packet 90 is shown in FIG. 9 , which again includes the fields shown previously in FIG. 8 , except that write data packet 90 also includes a write field 92 with the “write” operational code; an ADDR field 94 with the logical address to be written; a LEN field 96 with the length to be written; and a DATA field 98 which contains the actual data to write. The packet extractor extracts the operational code from write data packet 90 and transfers this code to the application command interpreter. The logical address is transferred to the address resolve module which translates this logical address to a physical address on one of the flash modules. The data handler optionally calculates error correction and detection mechanisms if employed by the USB flash device. Once all of the flash memory modules are ready, a “write” command is sent to the flash module or modules containing the physical address, which may optionally span across more than one flash module to the MTD block. The MTD block then issues a “write” command on the data/address bus which connects the flash modules to the USB device controller. Once the operation is complete and a status packet is returned to the MTD, the result of the operation is transmitted to the host controller and passed to the device driver in the host platform.
When the flash controller finishes the writing process, the controller signals to the host platform that the status of the USB flash memory device has changed, by sending a “write status” packet 100, as shown in FIG. 10 . In place of data field 98, write status packet 100 contains a status field 102. The host platform reads the status packets from the flash memory device, and from write status packet 100, the host platform retrieves information on the completion status of the write command by reading status field 102. In this example, the flash memory device repeats ADDR field 94 and LEN field 96 in order for the host platform to have a reference to the specific command related to status packet 100.
As shown in FIG. 11 , a “read request” packet 104 contains the operation code for the “read” command in a read field 106, and the logical address of the desired location from which the flash controller should read in an ADDR field 108. Upon receiving this command, the flash controller issues a read command to the MTD block, after the address resolve module has translated the address contained in ADDR field 108 to a specific physical address in one of the flash components.
When the flash controller receives the data from the flash device, either after the read command was issued, or if an error occurred, the flash controller sends a signal to the host platform to indicate that a new status packet must be read. The host platform issues a read request and receives a “read status” packet 110 as shown in FIG. 12 . Read status packet 110 contains the address of the read data in ADDR field 108, as well as the length of the read data in a LEN field 112 and the data itself in a data field 114. Read status packet 110 also features the status word, according to which the operation was completed, in a status field 116. The read operation can be completed with many different status situations such as success, fail, error detected, invalid address, invalid length and so forth.
When the host platform needs to erase an erase unit in the flash device, the host platform issues an “erase request” packet 118, shown in FIG. 13 . This packet contains the “erase” operation code in an erase field 120, and the logical address of the erase unit in an ADDR field 122. Upon receiving such a request, the flash controller translates the logical address to a physical erase unit address on one of the physical address spaces of the flash modules, and issues an erase command to the MTD block.
The erase process generally takes more time then a read or write process. When this erase process is finished, the controller notifies the host platform a new status packet is ready to transmit. The controller then transmits an “erase status” packet 124, as shown in FIG. 14 . Erase status packet 124 contains the address of the erased unit in ADDR field 122, thereby providing the host platform with a reference to the erase requests. The status according to which the operation was completed is provided in a status field 126.
It will be appreciated that the above descriptions are intended only to serve as examples, and that many other embodiments are possible within the spirit and the scope of the present invention.
Claims (81)
1. A USB flash memory device for connecting to a USB-defined bus, the flash memory device comprising:
(a) at least one flash memory module for storing data;
(b) a USB connector for connecting to the USB-defined bus and for sending packets on, and for receiving packets from, the USB-defined bus;
(c) a USB controller for controlling said at least one flash memory module and for controlling said USB connector according to at least one packet received from the USB-defined bus, such that data is written to and read from said at least one flash memory module;
(d) an electrical interface for connecting to said USB connector and for receiving said packets from said USB connector as a plurality of electrical signals;
(e) a logical interface for connecting to said electrical interface and for translating said plurality of electrical signals to logic signals, said logic signals being passed to said at least one flash memory module;
(f) a functional interface for receiving said logic signals such that if said logic signals represent a USB functional packet, said functional interface sends a USB command to said USB controller according to said USB functional packet;
(g) an application packet extractor for connecting to said logical interface and for receiving said logic signals, said application packet extractor extracting at least one packet from said logic signals; and
(h) an application command interpreter for receiving said at least one packet and for determining a command according to said at least one packet, said command being passed to said USB controller.
2. The flash memory device of claim 1 , further comprising:
(i) an address resolver module for receiving said at least one packet and for resolving an address contained in said at least one packet, said address being sent to said USB controller, such that said command is performed according to said address.
3. The flash memory device of claim 2 , wherein said command is a write command for writing data to said at least one flash memory module and said address is a logical address for writing said data, such that said address resolver module resolves said logical address to a physical address of said at least one flash memory module.
4. The flash memory device of claim 2 , wherein said command is a read command for reading data from said a least one flash memory module and said address is a logical address for reading said data, such that said address resolver module resolves said logical address to a physical address of said at least one flash memory module.
5. The flash memory device of claim 2 , further comprising:
(j) a data handler for performing an error detection and correction routine for said at least one flash memory module.
6. The flash memory device of claim 5 , further comprising:
(k) a status handler for receiving said USB functional packet from said functional interface, and for sending a status packet concerning a status of said at least one flash memory module according to said USB functional packet.
7. The flash memory device of claim 6 , further comprising:
(l) a MTD (memory technology driver) for receiving a write command and physical address of said at least one flash memory module, and for performing said write command to said physical address.
8. A method of storing and retrieving data comprising:
utilizing, for storing and retrieving the data, a flash memory system having integrally formed therewith and protruding therefrom an electrical connector configured in accordance with a USB standard, the flash memory system having memory cells organized into blocks of memory cells, the memory cells of the individual blocks being simultaneously erasable before data are rewritten therein;
utilizing for the memory cells within the flash memory system a defined logical address space;
receiving, through the electrical connector, logical signals that contain at least data write and data read packets in the form of application packets that are in accordance with the USB standard;
under the control of a USB controller within the flash memory system,
communicating with a host via the electrical connector;
extracting the read and write packets from the received logical signals in accordance with the USB standard;
in response to extracting a data write packet from the received logical signals, obtaining from the extracted data write packet a write command, a write logical address within the flash memory system logical address space, a length of data to be written and data to be written, wherein the obtaining is in accordance with the USB standard, and thereafter converting the write logical address into a write physical address within one or more of the blocks of memory cells and writing the data to be written into those of the memory cells having the write physical address; and
in response to extracting a data read packet from the received logical signals, obtaining from the extracted data read packet a read command and a read logical address within the memory system logical address space, wherein the obtaining is in accordance with the USB standard, and thereafter converting the read logical address into a read physical address within one or more of the blocks of memory cells, reading the data from those of the memory cells having the read physical address and sending the read data through the electrical connector as another packet in accordance with the USB standard.
9. The method of claim 8, wherein the received logical signals are only in accordance with the USB standard, and wherein writing the received data into the flash memory system and reading data from the flash memory system are performed exclusively in response to logical signals in accordance with the USB standard.
10. The method of claim 8, wherein said electrical connector is the only electrical bus connector that is connected with the flash memory system.
11. The method of claim 8, further comprising identifying said received application packets as read packets or write packets, wherein the identifying is in accordance with the USB standard.
12. The method of claim 8 wherein said logical signals encode audio data.
13. The method of claim 8 wherein said logical signals encode video data.
14. A data storage device, comprising:
an electrical connector configured in accordance with a USB standard, a flash memory and a USB controller of the flash memory that are together formed integrally as a portable memory device;
wherein the flash memory includes an array of memory cells organized into blocks of memory cells, the memory cells of an individual block being simultaneously erasable before data are rewritten therein;
wherein the flash memory is characterized by a defined logical address space;
wherein said USB controller comprises a USB-defined interface for sending and receiving USB-defined application packets via a USB-defined bus and a command interpreter which interprets read and write block commands received in the form of USB-defined application packets in accordance with the USB standard into actions for said flash memory and an address resolver which is adapted to translate a logical address within the defined logical address space from said USB-defined application packets into a physical address in one or more memory cell blocks of the flash memory;
wherein the USB controller, using the USB-defined interface, receives the USB-defined application packets from a host via the USB-defined bus;
wherein the USB controller, using the command interpreter and the address resolver, responds to those of said USB-defined application packets that contain a write command, a logical address within the defined logical address space, a length of data to be written and data to be written, by extracting the write command, the logical address, the length of data to be written and the data to be written from the packets, wherein the extracting is in accordance with the USB standard, and converting the logical address into a physical address of the flash memory and writing the data to be written into the flash memory at the physical address, and
wherein the USB controller, using the command interpreter and the address resolver, responds to those of said USB-defined application packets that contain a read command and a logical address within the defined logical address space by extracting the read command and the logical address from the packets, wherein the extracting is in accordance with the USB standard, converting the logical address into a physical address of the flash memory, reading the data from the physical address of the flash memory and sending the read data through the electrical connector as part of another packet in accordance with the USB standard.
15. A device according to claim 14, wherein the portable memory device has only one electrical bus connector.
16. A data storage system, comprising:
an electrical connector configured in accordance with a USB standard, flash memory and a USB controller of the flash memory which are together formed integrally as a portable memory device,
wherein the flash memory includes an array of re-writable non-volatile memory cells organized into blocks of memory cells, the memory cells of an individual block being simultaneously erased before data are rewritten therein;
wherein the flash memory is characterized by a defined logical address space;
wherein the USB controller is configured to receive logical signals through the electrical connector and extract data packets from the logical signals received through the electrical connector, which data packets are in accordance with the USB standard;
wherein said USB controller comprises a USB-defined interface for sending and receiving the USB-defined data packets via a USB-defined bus and a command interpreter which interprets read and write block commands contained in the extracted USB-defined data packets into actions for said flash memory and an address resolver which is adapted to translate a logical address within the defined logical address space from said USB-defined data packets into a physical address in one or more of said at least one flash memory module;
wherein the USB controller, using the USB-defined interface, receives the USB-defined data packets from a host via the USB-defined bus;
in response to extracting a packet containing a data write command, the USB controller obtains therefrom the write command, a write logical address within the defined logical address space, a length of data to be written and data to be written, wherein the obtaining is in accordance with the USB standard, and thereafter converts the write logical address into a write physical address within one or more of the blocks of memory cells and writes the data to be written into the memory cells having the write physical address; and
in response to extracting a packet containing a data read command, the USB controller obtains therefrom the read command and a read logical address within the defined logical address space, wherein the obtaining is in accordance with the USB standard, and thereafter converts the read logical address into a read physical address within one or more of the blocks of memory cells, reads the data from the memory cells having the read physical address and sends the read data through the electrical connector as another packet in accordance with the USB standard.
17. The system of claim 16, wherein the USB controller is further configured to write the received data into the flash memory system and read data from the flash memory system only in response to packets in accordance with the USB standard.
18. The system of claim 17 wherein the portable memory device has only one electrical bus connector.
19. A method of using a flash memory device, comprising:
in a unitary flash memory device having an electrical connector configured in accordance with a USB standard and having at least one flash memory module wherein the electrical connector of said device is configured to be removably coupled to a USB port on a host system:
receiving a packet in accordance with the USB standard through said electrical connector; and
under the control of a USB controller within the flash memory device,
identifying said packet as a read packet or a write packet in accordance with the USB standard;
extracting a read command from the packet if identified as a read packet or a write command from the packet if identified as a write packet in accordance with the USB standard; and
executing the extracted read or write command to perform respective read or write actions within said at least one flash memory module.
20. A method according to claim 19, additionally comprising:
utilizing for the flash memory module a defined logical address space;
under the control of the USB controller within the flash memory device,
extracting from the packet a logical address within the logical address space of the flash memory module, wherein the extracting is in accordance with the USB standard;
converting the logical address into a physical address within the at least one flash memory module; and
performing a data read or write action at the physical address in the at least one flash memory module.
21. A method according to claim 20 wherein said read packet contains a read command and a read logical address within the logical address space of the flash memory module and wherein said write packet contains a write command, a write logical address within the logical address space of the flash memory module, a length of data to be written and data to be written.
22. A method according to claim 19, wherein said unitary flash memory device has only one electrical bus connector.
23. A method according to claim 19, further comprising:
extracting at least one parameter from said received packet according to the identification of the packet as a read packet or a write packet, wherein the extracting is in accordance with the USB standard.
24. A flash memory device, comprising:
(a) at least one flash memory module;
(b) an electrical connector configured in accordance with a USB standard and adapted for connection to a USB-defined bus in accordance with the USB standard; and
(c) a USB controller adapted for communicating with a host via the USB-defined bus and for managing the at least one flash module;
wherein said USB controller comprises:
a USB-defined interface for interfacing with the host via the USB-defined bus;
a packet extractor adapted for receiving USB-defined data packets through the electrical connector and extracting information from the USB-defined data packets in accordance with the USB standard;
a command interpreter which interprets commands extracted from the USB-defined data packets into actions for said at least one flash memory module;
an address resolver which is adapted to translate a logical address extracted from said USB-defined data packets into a physical address in one or more of said at least one flash memory module; and
a data handler adapted to convey data extracted from said USB-defined data packets to said least one flash memory module.
25. A device according to claim 24, wherein the flash memory device has only a single electrical bus connector.
26. A device according to claim 24, wherein said USB controller is adapted to extract packets containing audio data in accordance with the USB standard.
27. A device according to any of claims 14, 15 or 24, wherein said USB controller is implemented as a single integrated circuit.
28. A device according to claim 27, wherein said single integrated circuit comprises an ASIC (application specific integrated circuit).
29. The flash memory device of claim 24, wherein the commands include one or more of read, write and erase commands and the one or more actions correspondingly include one or more of read, write and erase.
30. A method of storing and retrieving data, comprising:
utilizing a flash memory system having integrally formed therewith and protruding therefrom an electrical connector in accordance with a USB standard, the memory system having memory cells organized into blocks of memory cells and a USB controller comprising command interpreter, address resolver and data handler functions;
utilizing for the memory cells within the flash memory system a defined logical address space;
receiving, through the electrical connector, logical signals that contain at least data write and data read packets;
under the control of the USB controller,
communicating with a host via the electrical connector;
extracting the data write and data read packets from the logical signals in accordance with the USB standard; and
in response to extracting a data write packet from the received logical signals, obtaining from the extracted data write packet a write command, a write logical address within the defined logical address space, a length of data to be written and data to be written, wherein the obtaining is in accordance with the USB standard, and thereafter sending substantially in parallel the write command to the command interpreter function, the write logical address to the address resolver function to convert the logical address into a physical address within the memory system and the data to be written to the data handler function to write the received data into the memory cells having the physical address.
31. A method according to claim 30, wherein in response to extracting a data read packet from the received logical signals, obtaining from the extracted data read packet a read command and a read logical address within the defined logical address space, wherein the obtaining is in accordance with the USB standard, and thereafter sending substantially in parallel the read command to the command interpreter function, the read logical address to the address resolver function to convert the read logical address into a read physical address within the flash memory system, and the data to the data handler, and thereafter sending the read data through the electrical connector as another packet in accordance with the USB standard.
32. A method of storing and retrieving data, comprising:
utilizing, for storing and retrieving the data, a flash memory system having integrally formed therewith and protruding therefrom an electrical connector configured in accordance with a USB standard, the flash memory system having memory cells organized into blocks of memory cells, the memory cells of the individual blocks being simultaneously erasable before data are rewritten therein;
utilizing for the memory cells within the flash memory system a defined logical address space;
receiving and transmitting logical signals in accordance with the USB standard to and from the flash memory system through the electrical connector;
under the control of a USB controller within the flash memory system,
communicating with a host via the electrical connector;
in response to receiving through the electrical connector those of the logical signals that contain a USB-defined data packet that includes a write command, obtaining from the USB-defined data packet, in accordance with the USB standard, the write command, a write logical address within the defined logical address space, a length of data to be written and data to be written, converting the write logical address into a write physical address in a block within the flash memory system and writing the data to be written into the block within the flash memory system at the write physical address; and
in response to receiving through the electrical connector those of the logical signals that contain a USB-defined data packet that includes a read command, obtaining from the USB-defined data packet, in accordance with the USB standard, the read command and a read logical address within the defined logical address space, converting the read logical address into a read physical address in a block within the flash memory system, reading the data from the read physical address in the block and sending the read data through the electrical connector as logical signals in accordance with the USB standard.
33. The method of any of claims 8, 19 or 32, wherein said flash memory system comprises a form factor smaller than a PCMCIA form factor.
34. The method of claim 32, wherein receiving and sending logical signals to and from the flash memory system through the electrical connector occur exclusively in accordance with the USB standard.
35. The method of claim 32, wherein said electrical connector is the only electrical bus connector that is connected with the flash memory system.
36. The method of claim 30 or claim 32 further comprising identifying said received logical signals as read packets or write packets.
37. A USB flash memory device for connecting to a USB-defined bus, comprising:
(a) at least one flash memory module for storing data;
(b) a USB connector adapted for connecting to the USB-defined bus and for sending packets on, and for receiving packets from, the USB-defined bus;
(c) a USB controller operatively coupled to said USB connector, the USB controller adapted for communicating with a host via the USB-defined bus as well as for controlling said at least one flash memory module according to at least one packet received via the USB connector from the USB-defined bus, such that data is written to and read from said at least one flash memory module;
(d) an electrical interface adapted for connecting to said USB connector and for receiving said packets from said USB connector as a plurality of electrical signals;
(e) a logical interface adapted for connecting to said electrical interface and for translating said plurality of electrical signals to logic signals, said logic signals being passed to said at least one flash memory module;
(f) a functional interface adapted for receiving said logic signals such that if said logic signals represent a USB functional packet, said functional interface sends a USB command to said USB controller according to said USB functional packet;
(g) an application packet extractor adapted for connecting to said logical interface and for receiving said logic signals, said application packet extractor extracting at least one packet from said logic signals, wherein the extracting is in accordance with the USB standard; and
(h) an application command interpreter for receiving said at least one packet and for determining a command according to said at least one packet in accordance with the USB standard, said command being passed to said USB controller.
38. The flash memory device of claim 37, further comprising:
(i) an address resolver module for resolving an address contained in said at least one packet, said address being sent to said USB controller, such that said command is performed according to said address.
39. The flash memory device of claim 38, wherein said command is a write command for writing data to said at least one flash memory module and said address is a logical address for writing said data, such that said address resolver module resolves said logical address to a physical address of said at least one flash memory module.
40. The flash memory device of claim 38, wherein said command is a read command for reading data from said at least one flash memory module and said address is a logical address for reading said data, such that said address resolver module resolves said logical address to a physical address of said at least one flash memory module.
41. The flash memory device of claim 38, further comprising:
(j) a data handler for performing an error detection and correction routine for said at least one flash memory module.
42. The flash memory device of claim 41, further comprising:
(k) a status handler for sending a status packet concerning a status of said at least one flash memory module according to said USB functional packet.
43. The flash memory device of claim 42, further comprising:
(l) an MTD (memory technology driver) for receiving a write command and physical address of said at least one flash memory module and for performing said write command to said physical address.
44. A USB flash memory device for connecting to a USB-defined bus, the flash memory device comprising:
(a) at least one flash memory module;
(b) a USB connector adapted for connection to a USB-defined bus and for conveying USB-defined packets sent to or received from a host via said USB-defined bus; and
(c) a USB controller adapted to communicate with the host via said USB-defined bus as well as to carry out at least one of reads and writes in said at least one flash memory module in accordance with said USB-defined packets,
wherein said USB controller comprises:
a USB-defined interface for sending and receiving said USB-defined packets via said USB connector and said USB-defined bus;
a packet extractor for extracting information from the USB-defined data packets received via said USB-defined interface;
a command interpreter which is adapted to interpret commands extracted from the USB-defined data packets into corresponding actions addressed to said at least one flash memory module; and
an address resolver module which is adapted to translate logical addresses extracted from said USB-defined data packets into physical addresses in one or more of said at least one flash memory module, wherein the USB controller is further adapted to use the corresponding physical addresses when issuing commands to said at least one flash memory module.
45. The USB flash memory device of claim 44, wherein the commands include one or more of read, write and erase commands and the one or more actions correspondingly include one or more of read, write and erase.
46. A USB flash memory device for connecting to a USB-defined bus, the flash memory device comprising:
(a) at least one flash memory module;
(b) a USB connector adapted for connection to a USB-defined bus and for conveying USB-defined packets sent to or received from a host via the USB-defined bus; and
(c) a USB controller which is adapted to communicate with the host via the USB connector and the USB-defined bus and which is adapted to carry out at least one of reads and writes in the at least one flash memory module in accordance with the USB-defined packets,
wherein the USB controller comprises a packet extractor adapted for receiving USB-defined data packets via the USB connector and extracting information from the USB-defined data packets, and a command interpreter adapted to interpret commands extracted from the USB-defined data packets into actions for the at least one flash memory module, and
wherein the USB controller is configured to build an identification structure within the USB flash memory device for holding memory size and manufacturing type information of the at least one flash memory module determined by the USB controller and use the memory size and manufacturing type information to build an address translation table for use by the USB controller.
47. The USB flash memory device according to claim 46, wherein the device is provided as an integral unit with the USB connector.
48. The USB flash memory device according to claim 46, wherein the USB controller further comprises:
an address resolver module which is adapted to translate a logical address from the USB-defined data packets into a physical address of the at least one flash memory module using the address translation table.
49. The USB flash memory device according to claim 48, wherein the at least one flash memory module comprises a plurality of flash memory modules.
50. The USB flash memory device according to claim 48, wherein, if one of the commands is a write command for writing data to the at least one flash memory module and the logical address is a logical address for writing the data, the address resolver module is configured to resolve the logical address to a physical address of the at least one flash memory module.
51. The USB flash memory device according to claim 48, wherein, if one of the commands is a read command for reading data from the at least one flash memory module and the logical address is a logical address for reading the data, the address resolver module is configured to resolve the logical address to a physical address of the at least one flash memory module.
52. The USB flash memory device according to claim 46, further comprising:
a data handler adapted for performing an error detection and correction routine on the at least one flash memory module.
53. The USB flash memory device according to claim 46, further comprising:
a status handler adapted for sending status packets concerning a status of the at least one flash memory module according to the USB-defined data packets.
54. The USB flash memory device according to claim 46, wherein the device is configured to act as a dynamically attachable/detachable non-volatile storage device for the host.
55. The USB flash memory device according to claim 46, wherein the USB controller is implemented as a single integrated circuit.
56. The USB flash memory device according to claim 46, wherein the information extracted from the USB-defined data packets includes a write command and the USB controller is configured to interpret the write command and extract data to be written from the USB-defined data packets.
57. The USB flash memory device according to claim 46, wherein the USB-defined bus is configured to be connected to the host and the host is configured to provide commands to the USB controller using a standard protocol.
58. The USB flash memory device according to claim 46, further comprising an address/data bus for interconnecting the USB controller and the at least one flash memory module.
59. The USB flash memory device according to claim 58, wherein the address/data bus is configured to transfer addresses and data associated with the actions to and from the at least one flash memory module.
60. The USB flash memory device according to claim 46, further comprising a control line for interconnecting the USB controller and the at least one flash memory module, wherein the USB controller is configured to use the control line to control the power of the at least one flash memory module.
61. The USB flash memory device according to claim 46, wherein the USB controller is configured to negotiate with the at least one flash memory module to determine at least one feature of the flash memory module.
62. The USB flash memory device according to claim 61, wherein the USB controller is configured to notify the host that it is ready for use after the negotiation.
63. The USB flash memory device according to claim 62, wherein the notification includes at least one USB-defined data packet.
64. The USB flash memory device according to claim 63, wherein at least one USB-defined data packet contains information of the at least one feature of the at least one flash memory module.
65. The USB flash memory device according to claim 46, further comprising:
memory technology drivers, each adapted for performing actions on a respective type of flash memory module; and
an identification module adapted for determining a type of the at least one flash memory module and for determining, in accordance with the determined type, which one of the memory technology drivers to activate for performing the actions.
66. The USB flash memory device according to claim 46, wherein the USB controller includes a plurality of chip enable signal lines for attaching to a plurality of flash memory modules.
67. The USB flash memory device according to claim 46, wherein the USB connector is attached to the USB controller by a combined physical/logical interface.
68. The USB flash memory device according to claim 67, wherein the combined physical/logical interface is part of the USB controller.
69. The USB flash memory device according to claim 46, further comprising:
a functional interface adapted to receive the USB-defined packets, such that if one of the USB-defined packets is a USB token packet, the functional interface is configured to act on the token packet;
wherein the packet extractor is serially connected after the functional interface.
70. The USB flash memory device according to claim 46, wherein the USB controller is configured to invoke:
a memory technology driver to control the at least one flash memory module in response to commands extracted from the USB-defined data packets.
71. The USB flash memory device of claim 46, wherein the commands include one or more of read, write and erase commands and the one or more actions correspondingly include one or more of read, write and erase.
72. A data-processing method performed in a USB flash memory device that includes at least one flash memory module, a USB controller, and a USB connector for connecting the USB controller to a host via a USB-defined bus, the USB controller including a USB-defined interface for communicating with the host via the USB-defined bus, comprising:
receiving, at the USB-defined interface, USB-defined data packets from the host via the USB-defined bus and the USB connector;
under the control of the USB controller:
determining memory size and manufacturing type information of the at least one flash memory module;
building an address translation table in accordance with the memory size and manufacturing type information;
extracting information from the USB-defined data packets;
interpreting a command extracted from at least one of the USB-defined data packets into one or more actions, each command having at least one associated logical address extracted from the at least one USB-defined data packet; and
converting the logical address into a physical address of the at least one flash memory module using the address translation table; and
performing the one or more actions at the physical address of the at least one flash memory module.
73. The data-processing method according to claim 72, further comprising storing the memory size and manufacturing type information in an identification structure within the USB flash memory device.
74. The data-processing method according to claim 72, including:
under the control of the USB controller,
extracting a write command and a predefined amount of data from the at least one of the USB-defined data packets; and
writing the predefined amount of data into locations including the physical address in accordance with the write command.
75. The data-processing method according to claim 72, including:
under the control of the USB controller,
extracting a read command from the at least one of the USB-defined data packets;
retrieving data from locations including the physical address in accordance with the read command; and
transmitting the retrieved data to the host via the USB connector and the USB-defined bus.
76. The data-processing method according to claim 72, including:
under the control of the USB controller, executing a memory technology driver to perform the one or more actions corresponding to the command on data associated with the physical address.
77. The data-processing method according to claim 72, further comprising:
under the control of the USB controller, negotiating with the at least one flash memory module to determine at least one feature of the flash memory module.
78. The data-processing method according to claim 77, further comprising:
under the control of the USB controller, notifying the host after its negotiation with the at least one flash memory module.
79. The data-processing method according to claim 72, wherein the USB flash memory device includes memory technology drivers, each adapted for performing actions on a respective type of flash memory module, the method further comprising using the manufacturing type to determine a respective memory technology driver to activate for the at least one flash memory module.
80. The data-processing method according to claim 72, including:
receiving electrical signals from the host via the USB-defined bus and the USB connector, wherein the electrical signals are USB-compatible; and
extracting the USB-defined packets from the electrical signals.
81. The data-processing method according to claim 72, wherein the command includes one or more of read, write and erase commands and the one or more actions correspondingly include one or more of read, write and erase.
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