WO2017005009A1

WO2017005009A1 - External device expansion card and data processing method for input/output external device

Info

Publication number: WO2017005009A1
Application number: PCT/CN2016/076492
Authority: WO
Inventors: 常轶松; 张科; 崔泽汉; 陈明宇
Original assignee: 华为技术有限公司
Priority date: 2015-07-08
Filing date: 2016-03-16
Publication date: 2017-01-12
Also published as: CN106325377A; CN106325377B

Abstract

An external device expansion card and a data processing method for an input/output external device. The external device expansion card comprises: an interface unit (01) for being inserted on a memory card slot of a host, a memory unit (02), a memory unit controller (03), an input/output (I/O) external device (04) and an I/O external device controller (05). The external device expansion card may be directly inserted into the memory card slot of the host via the interface unit (01), and the memory unit (02) and the I/O external device (04) are integrated on the external device expansion card, such that the I/O external device controller (05) and the host may access the memory unit (02) directly by means of a physical address of the memory unit (02), namely, the I/O external device controller (05) and the host may read data in the memory unit (02) directly according to the physical address of the memory unit (02), thereby greatly reducing overhead for reading data from a memory by the host and the I/O external device (04).

Description

External device expansion card and data processing method of input/output external device

This application claims the priority of the Chinese Patent Application filed on July 8, 2015, the Chinese Patent Office, Application No. 201510400020.2, entitled "External Device Expansion Card and Data Processing Method for Input and Output External Devices", the entire contents of which are The citations are incorporated herein by reference.

Technical field

The present invention relates to communication technologies, and in particular, to an external device expansion card and a data processing method for an input/output external device.

Background technique

Input/Output (I/O) external devices are an important part of the computer system and hardware resources. At present, I/O external devices of mainstream computer systems mainly include two types, one is a traditional I/O external device controller, and the other is a hardware accelerator expansion card.

In the prior art, the I/O external device and the central processing unit (CPU) of the computer system have two coupling modes. The coupling method mainly used is a separate loose-coupled interconnection implementation based on a dedicated high-bandwidth peripheral bus such as Peripheral Component Interconnect (PCI) or PCI Express Channel (PCIe). In this way, the I/O external device communicates with the CPU through a high-speed interconnect bus between chips such as PCI or PCIe to deliver raw data and processing results.

However, with the above-described separation loose interconnection implementation, the CPU of the computer system needs to access the I/O external device across multiple bus interfaces, thereby causing a large amount of communication protocol conversion overhead.

Summary of the invention

The present invention provides a data processing method for an external device expansion card and an input/output external device, which is used to solve the problem that the CPU accesses the I/O external device in the prior art.

A first aspect of the present invention provides an external device expansion card, including: an interface unit, a memory unit, a memory unit controller, an input/output I/O external device, and an I/O external device that are inserted into a memory card slot of the host. Device controller

The interface unit is communicatively connected to the memory unit controller and the I/O external device controller;

The memory unit is communicatively coupled to the memory unit controller, and the I/O external device controller is communicatively coupled to the I/O external device;

The I/O external device controller is communicatively coupled to the memory unit controller; wherein

The I/O external device controller is configured to send, to the memory unit controller, a first read request that carries a physical address in the memory unit, and read from the memory unit by using the memory unit controller Data corresponding to the physical address; the interface unit is configured to receive a second read request that is sent by the host and that carries a physical address in the memory unit, and forward the second read request to the memory And the unit controller reads, by the memory unit controller, data corresponding to the physical address from the memory unit.

In conjunction with the first aspect, in a first possible implementation of the first aspect, the memory unit controller is configured to receive a data cache space request request sent by the host by using the interface unit, and according to the data The cache space request requests a data cache space to be reserved within the memory unit.

In conjunction with the first aspect, in a second possible implementation of the first aspect, the external device expansion card further includes: an interconnection unit for connecting the remote external device expansion card, the interconnection unit and the interface Unit communication connection

The interconnecting unit is configured to receive a third read request sent by the host through the interface unit, and forward the third read request to an interconnect unit of the remote external device expansion card to read Taking data in a memory unit of the remote external device expansion card;

The third read request is sent by the interconnect unit of the remote external device expansion card to the memory unit controller of the remote external device expansion card, and the third read request carries the remote external device. The physical address in the memory unit of the expansion card.

In conjunction with the second possible implementation of the first aspect, in a third possible implementation of the first aspect, the external device expansion card further includes: a capacitive address memory CAM, the CAM and the interface unit The interconnection unit is communicatively coupled;

The CAM is configured to temporarily store data sent by the remote external device expansion card.

A second aspect of the embodiments of the present invention provides a data processing method for inputting and outputting an external device, where the method is used for an external device expansion card, and the external device expansion card includes: Interface unit, memory unit, memory unit controller, input/output I/O external device, I/O external device controller on the memory card slot;

The method includes:

The I/O external device controller acquires data to be processed, and sends the to-be-processed data to the I/O external device for processing;

The I/O external device processes the to-be-processed data, and sends the processed data to the I/O external device controller;

The I/O external device controller sends the processed data to the memory unit controller, and the processed memory unit stores the processed data in the memory unit;

Receiving, by the memory unit controller, a data access request sent by the host through the interface unit, and reading the processing in the memory unit according to a physical address in the memory unit carried by the data access request And transmitting the processed data to the host through the interface unit.

With reference to the second aspect, in a first possible implementation manner of the second aspect, the I/O external device controller acquires data to be processed, including:

The I/O external device controller sends a to-be-processed data read request to the memory unit controller;

The memory unit controller reads the to-be-processed data in the memory unit according to a physical address in the memory unit carried in the to-be-processed data read request, and sends the to-be-processed data to the The I/O external device controller.

With reference to the second aspect, in a second possible implementation manner of the second aspect, the I/O external device controller acquires data to be processed, including:

The I/O external device controller receives data to be processed transmitted by the host through the interface unit.

With reference to the second aspect, in a third possible implementation manner of the second aspect, the external device expansion card further includes: an interconnection unit configured to connect the remote external device expansion card;

The interconnection unit receives a remote external device expansion card data access request sent by the host through the interface unit, and forwards the remote external device expansion card data access request to the remote unit through the interconnect unit of the remote external device expansion card a memory unit controller of a remote external device expansion card, wherein the remote external device expansion card data access request carries the remote external device extension a physical address in the memory unit of the card, configured to request processed data stored in a memory unit of the remote external device expansion card;

The interconnection unit receives the processed data in the memory unit of the remote external device expansion card forwarded by the memory unit controller of the remote external device expansion card through the interconnection unit of the remote external device expansion card, and the The processed data in the memory unit of the remote external device expansion card is forwarded to the host through the interface unit.

In conjunction with the third possible implementation of the second aspect, in a fourth possible implementation of the second aspect, the interconnecting unit receives a remote external device expansion card data access request sent by the host through the interface unit ,Also includes:

If the interconnected unit does not receive the processed data forwarded by the interconnect unit of the remote external device expansion card within a preset time period, the error identifier is sent to the host through the interface unit.

With the fourth possible implementation of the second aspect, in a fifth possible implementation of the second aspect, the external device expansion card further includes: a capacitive address memory CAM;

After the interface unit sends the error identifier to the host, the interconnect unit receives the processed data forwarded by the interconnect unit of the remote external device expansion card, and stores the processed data in the In the CAM, and sending the first interrupt information to the host by using the interface unit;

Receiving, by the interface unit, a remote external device expansion card data access request that is sent by the host after receiving the first interrupt information, according to the retransmitted remote external device expansion card data access request, the CAM in the CAM The processed data is sent to the host.

With reference to the second aspect, in a sixth possible implementation manner of the second aspect, the I/O external device controller acquires data to be processed, and sends the to-be-processed data to the I/O external device. Before processing, it also includes:

The I/O external device controller receives a working state read request sent by the host through the interface unit, and sends the working state data to the host through the interface unit according to the working state read request;

The I/O external device controller receives the updated working state data sent by the host through the interface unit, and starts the I/O external device according to the updated working state data.

With reference to the sixth possible implementation manner of the second aspect, in a seventh possible implementation manner of the second aspect, the I/O external device controller receives a working status read by the host by using the interface unit Before taking the request, it also includes:

The memory unit controller receives a data cache space request request sent by the host through the interface unit, where the data cache space is used to store the processed data;

The memory unit controller reserves the data cache space in the memory unit according to the data cache space request.

With reference to the second aspect, in an eighth possible implementation manner of the second aspect, the I/O external device processes the to-be-processed data, and sends the processed data to the I/O external device. After the controller, it also includes:

The I/O external device controller sends a second interrupt information to the host through the interface unit, where the second interrupt information is used to indicate that the I/O external device has completed data processing.

The data processing method of the external device expansion card and the input/output external device provided by the embodiment of the present invention can be directly inserted into the memory card slot of the host through the interface unit, and the memory unit and the I/O external are integrated on the external device expansion card. The device, and thus the I/O external device controller and the host can directly access the memory unit through the physical address of the memory unit, that is, the I/O external device controller and the host can directly read the data in the memory unit according to the physical address in the memory unit. This greatly reduces the overhead of reading data from memory by the host and I/O external devices.

DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description of the drawings used in the embodiments or the prior art description will be briefly described below. Obviously, the drawings in the following description It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any inventive labor.

1 is a schematic structural diagram of Embodiment 1 of an external device expansion card provided by the present invention;

2 is a schematic structural diagram of Embodiment 2 of an external device expansion card provided by the present invention;

3 is a schematic structural diagram of Embodiment 1 of an external device expansion card system provided by the present invention;

4 is a schematic structural diagram of Embodiment 2 of an external device expansion card system provided by the present invention;

FIG. 5 is a schematic flowchart diagram of Embodiment 1 of a data processing method for an I/O external device according to the present invention;

FIG. 6 is a schematic flowchart diagram of Embodiment 2 of a data processing method for an I/O external device according to the present invention;

FIG. 7 is a schematic flowchart diagram of Embodiment 3 of a data processing method for an I/O external device according to the present invention.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. It is a partial embodiment of the invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

1 is a schematic structural diagram of Embodiment 1 of an external device expansion card provided by the present invention. As shown in FIG. 1 , the external device expansion card includes: an interface unit 01 for inserting into a memory card slot of a host, and a memory unit 02 The memory unit controller 03, the input/output (I/O) external device 04, and the I/O external device controller 05.

Referring to FIG. 1, the interface unit 01 is communicatively coupled to the memory unit controller 03 and the I/O external device controller 05. The memory unit 02 is communicatively coupled to the memory unit controller 03, and the I/O external device 04 is communicatively coupled to the I/O external device controller 05. The I/O external device controller 05 is communicatively coupled to the memory unit controller 03.

In a specific implementation, the host may be a device having a memory card slot such as a computer or a processor. Common memory card slots include: Dual-Inline-Memory-Modules (DIMM) card slots, but not limited to this.

The above memory unit 02 can be various versions of double rate synchronous dynamic random access memory (Double Data Rate, DDR for short), such as DDR, DDR2, DDR3, etc., but not limited thereto, other memory that can be used as memory can .

Specifically, the I/O external device controller 05 is configured to send a first read request carrying the physical address in the memory unit 02 to the memory unit controller 03, and read from the memory unit 02 through the memory unit controller 03. The data corresponding to the above physical address.

The receiving unit 01 is configured to receive a second read request sent by the host and carry the physical address in the memory unit 02, and forward the second read request to the memory unit controller 03, and control the memory unit The controller 03 reads the data corresponding to the physical address from the memory unit 02.

Specifically, the physical address in the memory unit 02 can be determined by the physical address of the memory card slot on the host, and the physical address in the memory unit 02 is within the physical address range of the memory card slot. After the external device expansion card is inserted into the memory card slot and the physical address of the memory unit 02 is determined, the physical address of the memory unit 02 is shared with the host and the I/O external device. Thus, the host and the I/O external device can directly read data from the memory unit using the physical address of the memory unit 02.

The external device expansion card provided in this embodiment can be directly inserted into the memory card slot of the host through the interface unit, and the memory unit and the I/O external device are integrated on the external device expansion card, thereby the I/O external device controller. And the host can directly access the memory unit through the physical address of the memory unit, that is, the I/O external device controller and the host can directly read the data in the memory unit according to the physical address in the memory unit, thereby greatly reducing the host and I/. O The overhead of external devices reading data from memory.

Further, the memory unit controller 03 can be configured to receive a data cache space request request sent by the host through the interface unit 01, and reserve a data cache space in the memory unit 02 according to the data cache space request. The data cache space can be used to store some data to be processed, or processed data.

2 is a schematic structural diagram of Embodiment 2 of an external device expansion card according to the present invention. As shown in FIG. 2, on the basis of FIG. 1, the external device expansion card further includes: an interconnection for connecting a remote external device expansion card. Unit 06, which is communicatively coupled to interface unit 01.

FIG. 3 is a schematic structural diagram of Embodiment 1 of an external device expansion card system according to the present invention. As shown in FIG. 3, the system includes a local external device expansion card 101 and a remote external device expansion card 102, wherein the local external device expansion card 101 The remote external device expansion card 102 has the same structure as the local external device expansion card, and includes: an interface unit 11, a memory unit 12, a memory unit controller 13, and an I/O external device. The I/O external device controller 15 and the interconnection unit 16.

The type of I/O external device may be different, and the local external device expansion card 101 and the remote external device expansion card are realized by connecting the interconnection unit 16 of the remote external device expansion card 102 with the interconnection unit 06 of the local external device expansion card 101. 102 connection. However, it is not limited to FIG. 3, and in this way, a plurality of remote external device expansion cards can be expanded. That is, the external device expansion card provided in this embodiment implements the scalability of the external device expansion card, and prevents an external device expansion card from being inserted into the memory card slot. After that, the type of I/O external device is limited.

The interconnection unit 06 is configured to receive a third read request sent by the host through the interface unit 01, and forward the third read request to the interconnect unit 16 of the remote external device expansion card to read the remote external device extension The data in the memory unit of the card. The third read request is sent by the interconnect unit 16 of the remote external device expansion card to the memory unit controller 13 of the remote external device expansion card, where the third read request carries the remote external device expansion card in the memory unit 12 Physical address.

In a specific implementation, the physical address of the memory unit 12 of the remote external device expansion card may also be determined by the physical address of the memory card slot of the host, and the physical address of the memory unit 12 of the remote external device expansion card is also the physical address of the memory card slot. The range does not coincide with the physical address of the memory unit of the local external device expansion card.

4 is a schematic structural diagram of Embodiment 2 of an external device expansion card system according to the present invention. Referring to FIG. 4, taking the local external device expansion card as an example, the external device expansion card may further include: a content addressable memory (Content Addressable Memory, Referred to as CAM) 07, the CAM 07 is communicatively coupled to the interface unit 01 and the interconnection unit 06.

The CAM07 is used to temporarily store data sent by a remote external device expansion card. Specifically, in the process of the host accessing the memory unit of the remote external device expansion card, if the remote external device expansion card does not receive the data returned by the remote external device expansion card within the preset time, the error identifier is sent to the host, and the error is sent. After the identification, if the remote external device expansion card returns the data requested by the host, the data is temporarily stored in the CAM07 of the local external device expansion card, and when the host requests again, the CAM07 of the local external device expansion card is directly The data in is sent to the host.

It should be noted that the above I/O external device may be a traditional I/O external device, or may be a hardware accelerator expansion card, etc., correspondingly, when the I/O external device is a traditional I/O external device, the above I/O The external device control unit 05 is a conventional I/O external device controller. When the I/O external device is a hardware accelerator expansion card, the above I/O external device control unit 05 may be a hardware accelerator, but this is not limit.

FIG. 5 is a schematic flowchart of Embodiment 1 of a data processing method for an I/O external device according to the present invention. The method is used for the foregoing external device expansion card. The structure of the external device expansion card can be referred to the embodiment of FIG. As further described, as shown in FIG. 2, the method includes:

S501. The I/O external device controller acquires the to-be-processed data, and sends the to-be-processed data to I/O external devices are processed.

S502: The I/O external device processes the to-be-processed data, and sends the processed data to the I/O external device controller.

S503. The I/O external device controller sends the processed data to the memory unit controller, and the processed memory unit stores the processed data in the memory unit.

S504. The memory unit controller receives a data access request sent by the host through the interface unit, and reads the processed data in the memory unit according to the physical address in the memory unit carried in the data access request, and passes the processed data. The interface unit sends to the host. The host can then use the processed data for further processing.

Specifically, the data access request may be sent by software or an application on a CPU in the host. The physical address carried in the data access request is the address corresponding to the processed data in the memory unit.

In this embodiment, the I/O external device controller stores the processed data of the I/O external device in the memory unit, and the host can directly read the processed data of the I/O external device stored in the memory unit, thereby realizing The host can directly read and write data in the memory unit, which greatly reduces the data migration overhead that exists when the I/O peripheral controller interacts with the host.

In another embodiment, the above I/O external device controller can obtain data to be processed in two cases:

(1) The data to be processed is pre-stored in the memory unit of the external device expansion card, specifically, the I/O external device controller sends a pending data read request to the memory unit controller; the memory unit controller according to the to-be-processed data The physical address in the memory unit carried in the read request reads the data to be processed in the memory unit, and sends the to-be-processed data to the I/O external device controller. The data to be processed is sent to the I/O external device for processing by the I/O external device controller. The physical address in the memory unit carried in the data read request to be processed is the physical address corresponding to the data to be processed in the memory unit.

In this embodiment, the I/O external device controller can directly read and write the memory unit by using direct memory access (DMA).

(2) The I/O external device controller receives the data to be processed sent by the host through the interface unit. That is, the to-be-processed data is sent by the other device in the host to the I/O external device controller in the external device expansion card. For example, the network card in the host may be sent to the I/O external device controller through the host. of.

Before the I/O external device controller acquires the to-be-processed data and sends the to-be-processed data to the I/O external device for processing, the I/O external device controller receives the working state read request sent by the host through the interface unit, and The working state data is sent to the host through the interface unit according to the working state read request. Further, the I/O external device controller receives the updated working state data sent by the host through the interface unit, and starts the I/O external device according to the updated working state data.

It should be noted that the I/O external device controller may include a plurality of different registers, and the value of the register indicates the working state of the external device expansion card, that is, the working state of the I/O external device controller returned to the host. The data is the value of each register. The host can modify the values of these registers and modify them to return to the external device expansion card to start the I/O external device in the external device expansion card.

Further, before the I/O external device controller receives the working state read request sent by the host through the interface unit, the memory unit controller may further receive a data cache space request request sent by the host through the interface unit, and further, the memory unit The controller reserves the foregoing data cache space in the foregoing memory unit according to the cache space request. The data cache space is used to store the processed data. In addition, for the above-mentioned case where the data to be processed needs to be stored in the memory unit, the data cache space can also be used to store the data to be processed.

During the specific implementation process, after receiving the data buffer space request request, the memory unit controller initializes the memory unit to reserve the data buffer space.

Referring to FIGS. 2 and 3, the above external device expansion card further includes: an interconnection unit.

FIG. 6 is a schematic flowchart of Embodiment 2 of a data processing method for an I/O external device according to the present invention. Referring to the external device expansion card system of FIG. 3 and FIG. 4, specifically, the host can directly read the remote external device expansion card. The data in the memory unit, as shown in Figure 6, specifically:

S601. The interconnect unit receives a remote external device expansion card data access request sent by the host through the interface unit, and forwards the remote external device expansion card data access request to the memory of the remote external device expansion card through the interconnect unit of the remote external device expansion card. Unit controller. The remote external device expansion card data access request carries a physical address in the memory unit in the remote external device expansion card, and is used to request the processed data stored in the memory unit of the remote external device expansion card.

Specifically, the processed data of the I/O external device in the remote external device expansion card is also stored in In the memory unit in the remote external device expansion card, the host can directly access the memory unit in the remote external device expansion card through the physical address of the memory unit in the remote external device expansion card, and the physical address carried in the remote external device expansion card data access request Is the corresponding physical address of the processed data in the memory unit of the remote external device expansion card.

S602. The interconnect unit receives the processed data in the memory unit of the remote external device expansion card forwarded by the memory unit controller of the remote external device expansion card through the interconnection unit of the remote external device expansion card, and expands the remote external device expansion card. The processed data in the memory unit is forwarded to the host.

FIG. 7 is a schematic flowchart diagram of Embodiment 3 of a data processing method for an I/O external device according to the present invention. In the process of accessing a remote external device expansion card, the host may have a long delay, in order to avoid the host reading an error. The information can be solved by multiple access methods. Take two asynchronous accesses as an example. As shown in Figure 7, the method includes:

S701. The interconnect unit receives a remote external device expansion card data access request sent by the host through the interface unit, and forwards the remote external device expansion card data access request to the memory of the remote external device expansion card through the interconnect unit of the remote external device expansion card. Unit controller.

S702. If the interconnected unit does not receive the processed data forwarded by the interconnecting unit of the remote external device expansion card within a preset time period, send an error identifier to the host by using the interface unit.

As shown in FIG. 4, the above external device expansion card may further include: a CAM.

S703. After the interface unit sends the error identifier to the host, the interconnect unit receives the processed data forwarded by the interconnect unit of the remote external device expansion card, and stores the processed data in the CAM and passes the interface. The unit sends a first interrupt message to the host.

S704. The interface unit receives a remote external device expansion card data access request that is sent by the host after receiving the first interrupt information, and sends the processed data in the CAM according to the retransmitted remote external device expansion card data access request. Give the host. That is, after the interface unit is again subjected to the remote external device expansion card data access request sent by the host, the interface does not need to be forwarded to the remote external device expansion card, and the processed data in the CAM can be directly sent to the host.

Referring to the foregoing embodiment, for the remote external device expansion card, like the local external device expansion card, the host also requests to read the remote external device expansion card I// before the remote external device expansion card's I/O external device processes the data. O The operating status data in the external device controller, and modify the working status data to be returned to the remote external device expansion card I/O external device controller to start the remote For the I/O external device of the external device expansion card, refer to the foregoing embodiment for a specific process, and details are not described herein again.

Similarly, for a remote external device expansion card, the host can also apply for a data cache space in advance, that is, send a data cache space request request to the memory unit controller of the remote external device expansion card, so that the memory unit controller of the remote external device expansion card is The data cache space is reserved in the memory unit of the remote external device expansion card. For the specific process, refer to the foregoing embodiment, and details are not described herein again.

In another embodiment, after the I/O external device processes the to-be-processed data, and sends the processed data to the I/O external device controller, the I/O external device controller sends the host to the host through the interface unit. Sending a second interrupt information, the second interrupt information is used to indicate that the I/O external device has completed data processing. It should be noted that the general memory card slot does not actively send an interrupt request to the CPU of the host. Therefore, the interrupt pin is generally not provided on the memory card slot. In this embodiment, the I/O external device controller is in I/. After the external device completes the data processing, it sends an interrupt message to the host to notify the host CPU of the subsequent processing. The remote external device expansion card can also send an interrupt message to the host by referring to the local external device expansion card.

In addition, a high-speed interconnect interface can be selected to better avoid delays in the above interconnected cells.

A person skilled in the art can understand that all or part of the steps of implementing the above method embodiments may be completed by using hardware related to the program instructions. The foregoing program may be stored in a computer readable storage medium, and the program is executed when executed. The foregoing steps include the steps of the foregoing method embodiments; and the foregoing storage medium includes: a medium that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, and are not intended to be limiting; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that The technical solutions described in the foregoing embodiments may be modified, or some or all of the technical features may be equivalently replaced; and the modifications or substitutions do not deviate from the technical solutions of the embodiments of the present invention. range.

Claims

An external device expansion card, comprising: an interface unit for inserting in a memory card slot of a host, a memory unit, a memory unit controller, an input/output I/O external device, and an I/O external device Controller

The interface unit is communicatively connected to the memory unit controller and the I/O external device controller;

The memory unit is communicatively coupled to the memory unit controller, and the I/O external device controller is communicatively coupled to the I/O external device;

The I/O external device controller is communicatively coupled to the memory unit controller; wherein

The I/O external device controller is configured to send, to the memory unit controller, a first read request that carries a physical address in the memory unit, and read from the memory unit by using the memory unit controller Obtaining data corresponding to the physical address; the interface unit is configured to receive a second read request sent by the host that carries the physical address in the memory unit, and forward the second read request And the memory unit controller reads data corresponding to the physical address from the memory unit by using the memory unit controller.
The external device expansion card according to claim 1, wherein the memory unit controller is configured to receive a data cache space application request sent by the host through the interface unit, and apply according to the data cache space. Requesting to reserve data cache space within the memory unit.
The external device expansion card according to claim 1, wherein the external device expansion card further comprises: an interconnection unit for connecting a remote external device expansion card, wherein the interconnection unit is in communication with the interface unit ;

The interconnecting unit is configured to receive a third read request sent by the host through the interface unit, and forward the third read request to an interconnect unit of the remote external device expansion card to read Taking data in a memory unit of the remote external device expansion card;

The third read request is sent by the interconnect unit of the remote external device expansion card to the memory unit controller of the remote external device expansion card, and the third read request carries the remote external device. The physical address in the memory unit of the expansion card.
The external device expansion card according to claim 3, wherein the external device expansion card further comprises: a capacitive address memory CAM, wherein the CAM is communicably connected to the interface unit and the interconnection unit ;

The CAM is configured to temporarily store data sent by the remote external device expansion card.
A data processing method for inputting and outputting an external device, wherein the method is used for an external device expansion card, and the external device expansion card includes: an interface unit and a memory unit for inserting in a memory card slot of the host , a memory unit controller, an input/output I/O external device, and an I/O external device controller;

The method includes:

The I/O external device controller acquires data to be processed, and sends the to-be-processed data to the I/O external device for processing;

The I/O external device processes the to-be-processed data, and sends the processed data to the I/O external device controller;

The I/O external device controller sends the processed data to the memory unit controller, and the memory unit controller stores the processed data in a physical address in the memory unit in;

The memory unit controller receives a data access request sent by the host through the interface unit, and reads the content in the memory unit according to the physical address in the memory unit carried by the data access request. The processed data is sent to the host through the interface unit.
The method according to claim 5, wherein the I/O external device controller acquires data to be processed, including:

The I/O external device controller sends a to-be-processed data read request to the memory unit controller;

The memory unit controller reads the to-be-processed data in the memory unit according to a physical address in the memory unit carried in the to-be-processed data read request, and sends the to-be-processed data to the The I/O external device controller.
The method according to claim 5, wherein the I/O external device controller acquires data to be processed, including:

The I/O external device controller receives the to-be-processed data sent by the host through the interface unit.
The method according to claim 5, wherein the external device expansion card further comprises: an interconnection unit for connecting a remote external device expansion card;

The interconnection unit receives a remote external device expansion card data access request sent by the host through the interface unit, and forwards the remote external device expansion card data access request through an interconnection unit of the remote external device expansion card a memory unit controller for the remote external device expansion card, wherein the remote external device expansion card data access request carries a physical address in a memory unit in the remote external device expansion card for requesting the remote external The processed data stored in the memory unit of the device expansion card;

The interconnection unit receives the processed data in the memory unit of the remote external device expansion card forwarded by the memory unit controller of the remote external device expansion card through the interconnection unit of the remote external device expansion card, and the The processed data in the memory unit of the remote external device expansion card is forwarded to the host through the interface unit.
The method according to claim 8, wherein the receiving unit, after receiving the remote external device expansion card data access request sent by the host through the interface unit, further comprises:

If the interconnected unit does not receive the processed data forwarded by the interconnect unit of the remote external device expansion card within a preset time period, the error identifier is sent to the host through the interface unit.
The method of claim 9, wherein the external device expansion card further comprises: a capacitive address memory CAM;

After the interface unit sends the error identifier to the host, the interconnect unit receives the processed data forwarded by the interconnect unit of the remote external device expansion card, and stores the processed data in the In the CAM, and sending the first interrupt information to the host by using the interface unit;

The interface unit receives a remotely sent by the host after receiving the first interrupt information The external device expansion card data access request transmits the processed data in the CAM to the host according to the retransmitted remote external device expansion card data access request.
The method according to claim 5, wherein before the I/O external device controller acquires the data to be processed and sends the data to be processed to the I/O external device for processing, the method further includes:

The I/O external device controller receives a working state read request sent by the host through the interface unit, and sends the working state data to the host through the interface unit according to the working state read request;

The I/O external device controller receives the updated working state data sent by the host through the interface unit, and starts the I/O external device according to the updated working state data.
The method of claim 11, wherein before the I/O external device controller receives the working status read request sent by the host through the interface unit, the method further includes:

The memory unit controller receives a data cache space request request sent by the host through the interface unit, where the data cache space is used to store the processed data;

The memory unit controller reserves the data cache space in the memory unit according to the data cache space request.
The method according to claim 5, wherein the I/O external device processes the data to be processed, and after the processed data is sent to the I/O external device controller, further includes :

The I/O external device controller sends a second interrupt information to the host through the interface unit, where the second interrupt information is used to indicate that the I/O external device has completed data processing.