US20020051350A1 - Load adjustment board and data processing apparatus - Google Patents
Load adjustment board and data processing apparatus Download PDFInfo
- Publication number
- US20020051350A1 US20020051350A1 US09/824,015 US82401501A US2002051350A1 US 20020051350 A1 US20020051350 A1 US 20020051350A1 US 82401501 A US82401501 A US 82401501A US 2002051350 A1 US2002051350 A1 US 2002051350A1
- Authority
- US
- United States
- Prior art keywords
- expansion slot
- load adjustment
- board
- adjustment board
- processing apparatus
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/0213—Electrical arrangements not otherwise provided for
- H05K1/0237—High frequency adaptations
- H05K1/0246—Termination of transmission lines
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0064—Earth or grounding circuit
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/0213—Electrical arrangements not otherwise provided for
- H05K1/0216—Reduction of cross-talk, noise or electromagnetic interference
- H05K1/023—Reduction of cross-talk, noise or electromagnetic interference using auxiliary mounted passive components or auxiliary substances
- H05K1/0231—Capacitors or dielectric substances
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/14—Structural association of two or more printed circuits
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/14—Structural association of two or more printed circuits
- H05K1/141—One or more single auxiliary printed circuits mounted on a main printed circuit, e.g. modules, adapters
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/04—Assemblies of printed circuits
- H05K2201/044—Details of backplane or midplane for mounting orthogonal PCBs
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
- H05K2201/10007—Types of components
- H05K2201/10022—Non-printed resistor
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
- H05K2201/10007—Types of components
- H05K2201/10196—Variable component, e.g. variable resistor
Abstract
The invention provides a circuit-mounted board which can improve the reliability in the operations of a system having expansion slots. The load adjustment board is a circuit-mounted board to be used by being inserted into the expansion slot of the system, and comprises a plurality of connection pins to obtain electric connection with another board, and devices each having variable electric property, such as a variable resistance or a variable capacitor, provided for each connection pin. One end of each device is connected to the respective connection pin, and the other end is fixed to the predetermined potential (ground, for example). The board is inserted into a vacant slot of the expansion slots of the system to suppress reflection noise etc.
Description
- 1. Field of the Invention
- The present invention relates to a circuit-mounted board to be inserted into an expansion slot of a data processing apparatus such as a computer system, more particularly to a load adjustment board capable of adjusting a load value thereof.
- 2. Related Art
- FIG. 4 shows a conventional memory module to be inserted into a memory expansion slot of a computer system or the like. The
memory module 20 has a plurality ofmemory ICs 25 mounted on a printed circuit having a multi-layered structure. Acontact 21 and eachpin 25 a of thememory IC 25 are electrically connected to each other via internal wiring of the printed circuit orexternal wiring 27. - FIG. 5 shows the motherboard of the computer system in which the
memory modules 20 are inserted. On themotherboard 52 with a multi-layered structure, amemory controller 54 and a plurality ofsockets 38 a for memory module are mounted. Eachmemory module 20 is inserted into asocket 38 a. Thememory controller 54 and thesockets 38 a are connected via internal wiring orexternal wiring 52 a so as to carry electric signals between thememory controller 54 and thememory ICs 25. - In the computer system shown in FIG. 5, when there is a vacant slot X of the
slots 38 a on themotherboard 52 to which nomemory module 20 is connected, the extremely light-weight load on the signal line of the vacant slot X may cause the system to malfunction due to undesired high frequency reflection noise or the like. This sometimes becomes a problem in the reliability of the operations of the system. - The present invention has been contrived to solve the above-mentioned problem, and has an object of providing a board mounted with circuits and capable of improving the reliability in the operations of the system having expansion slots.
- A load adjustment board according to the present invention is a board mounted with circuits and is to be inserted into an expansion slot of a data processing apparatus. The load adjustment board comprises a plurality of connection pins to obtain electric connection in the expansion slot, and devices each having variable electric properties. Each of the devices is provided for one of the plurality of connection pins. The one end of the device is connected to the one of the plurality of connection pins, and the other end of the device is connected to a node which supplies a predetermined potential.
- Thus, the insertion of the load adjustment board according to the present invention into the expansion slot can eliminate undesired high frequency components on the signal line of the slot and reduce reflection noise, thereby improving the reliability in the operations of the data processing apparatus.
- In the load adjustment board, the device may comprise a variable resistor, a variable capacitor, or a combination of these. By using such an electrical property variable device, the load on the signal line can be adjusted in accordance with the drivability of the memory controller or the load of the memory modules.
- The predetermined potential may be a ground potential. Fixing to the ground potential can cut off undesired high frequency components on the signal line of the slot to reduce reflection noise.
- The load adjustment board may further comprise means for adjusting a length of wiring between the device and the connection pin. Thus the load on the signal line can be finely adjusted.
- A data processing apparatus according to the present invention comprises an expansion slot into which a board for expanding function of the device is inserted, and the load adjustment board which is inserted into the expansion slot. In the data processing apparatus, the expansion slot may be a memory expansion slot.
- According to the data processing apparatus of the present invention, inserting the above-described load adjustment board into an expansion slot such as a memory expansion slot cuts off undesired high frequency components on the signal line of the slot, and reflection noise, thereby improving the reliability in the operations of the device.
- A better understanding of the invention will be obtained by reading the description of the preferred embodiment below, with reference to the following drawings, in which:
- FIG. 1A shows the load adjustment board of the present invention;
- FIGS. 1B to1D show examples of the chip devices mounted on the load adjustment board of the present invention;
- FIG. 2 shows the structure of the computer which utilizes the load adjustment board of the present invention;
- FIG. 3 shows a state of the motherboard where the load adjustment board of the present invention is inserted;
- FIG. 4 shows a conventional memory module; and
- FIG. 5 shows a state of the motherboard where the memory module is inserted.
- The embodiments of a load adjustment board of the present invention will be described as follows, with reference to the accompanying drawings.
- FIG. 1A shows a load adjustment board of the present invention. The load adjustment board of the present invention is used by being inserted into a vacant slot of memory expansion slots of a data processing apparatus such as a computer, and reduces interruptions or reflection noise of undesired high frequency components developed on the signal line of the slot.
- A
load adjustment board 10 includescontacts 11 which are connection pins to obtain electric connection with the pins provided in the slot when theboard 10 is inserted into the memory expansion slot. Thecontacts 11 are so arranged as to correspond to the pins set for the respective signal lines in the slots. Theload adjustment board 10 containselectronic chip devices 13 having electric properties equivalent to resistance, capacitor, inductor or a circuit combining these in series or parallel. Eachchip device 13 is provided for eachcontact 11 corresponding to the signal line. One end of eachchip device 13 is connected to thecorresponding contact 11 viawiring 10 a and the other end is connected or fixed to the ground potential. The ground potential is supplied from outside via the ground pin of thecontact 11. Instead of the ground, thechip devices 13 can be connected to a node which supplies the predetermined potential (for example, the node which supplies a potential of the power supply voltage or a potential obtained by dividing the potential of the power supply voltage). Thus, eachcontact 11 of theload adjustment board 10 is terminated via therespective chip device 13. Some of thecontacts 11 of theload adjustment board 10 can be terminated by being directly connected to a node which supplies a predetermined potential such as the ground without the intervention of thechip devices 13. - The
chip devices 13 mounted on theload adjustment board 10 can be composed of an element whose electric physical characteristic is variable such as a variable resistor (refer to FIG. 1B), a variable capacitor (refer to FIG. 1C), or a parallel circuit of a variable resistor and a variable capacitor (refer to FIG. 1D). Using a device having variable electric properties as eachchip device 13 makes it possible to adjust the load value of theload adjustment board 10 as desired. - In the
load adjustment board 10 of the present embodiment, the length of thewiring 10 a between thechip devices 13 and thecontacts 11 can be changeable. As shown in FIG. 1, this is realized by arrangingrelays 15 between thechip device 13 and thecontact 11, and by selecting one of wiring patterns a and b having different lengths from each other so as to adjust the wiring length between thechip devices 13 and thecontacts 11. The provision of the wiring patterns having different lengths makes the inductance and the like of the wiring patterns variable, thereby achieving fine adjustment of the value of the load of theload adjusting board 10. - FIG. 2 shows the structure of a computer in which the above described
load adjusting board 10 is to be inserted. Thecomputer 30 shown in FIG. 2 includes aCPU 32 which executes predetermined programs. TheCPU 32 is connected, via abus 34 for carrying data and control signals, to aROM 36, a memoryexpansion slot unit 38, ahard disk 40, a display section 42, an input operation section 44, anexpansion slot unit 46, and anetwork interface 48. TheROM 36 stores basic programs and data executed in theCPU 32. The display section 42 comprises a liquid crystal display (LCD) or a CRT display. The input operation section 44 comprises a keyboard or a mouse. The memoryexpansion slot unit 38 comprises a plurality of slots into which memory modules for increasing total memory capacity are inserted. Theload adjustment board 10 is used in a vacant slot in the memoryexpansion slot unit 38. Theexpansion slot unit 46 comprises slots into which expansion boards to expand functions of the computer or connect with other apparatuses are inserted. - FIG. 3 shows a state of the
load adjustment board 10 of the present embodiment mounted on the motherboard of the computer. On themotherboard 52 having a multi-layered structure, amemory controller 54 andsockets 38 each provided for a slot of the memoryexpansion slot unit 38 are mounted. In the memoryexpansion slot unit 38,necessary memory modules 20 are inserted into thesockets 38 a. Theload adjustment board 10 is inserted in thesocket 38 a of a vacant slot. Thememory controller 54 and thesockets 38 a are electrically connected via the internal wiring orexternal wiring 52 a of themotherboard 52. - As described above, the insertion of the
load adjustment board 10 of the present embodiment into a slot of the computer applies a load on the signal lines so as to cut off undesired high frequency components, thereby reducing reflection noise and the like. Since thechip devices 13 are each comprising an element whose electric physical characteristic is variable such as a variable resistance or a variable capacitor, the load on the signal lines can be adjusted in accordance with the drivability of the memory controller or the load of thememory modules 20. In addition, the changeable length of the wiring for thechip devices 13 realizes fine adjustment of the load on the signal line. - Although in this embodiment the description is made so that the load adjustment board is inserted into a slot for memory expansion, the board may be so structured as to be inserted into an expansion slot which is connected with external apparatus or to expand functions.
- Although the present invention has been described in connection with specified embodiments thereof, many other modifications, corrections and applications are apparent to those skilled in the art. Therefore, the present invention is not limited by the disclosure provided herein but limited only to the scope of the appended claims.
Claims (12)
1. A load adjustment board which is a board mounted with circuits and is to be inserted into an expansion slot of a data processing apparatus, comprising:
a plurality of connection pins to obtain electric connection in said expansion slot; and
devices each having variable electric properties,
each of said devices being provided for one of said plurality of connection pins, and one end of the device being connected to said one of said plurality of connection pins, and the other end of the device being connected to a node which supplies a predetermined potential.
2. The load adjustment board according to claim 1 , wherein said device comprises a variable resistor, a variable capacitor, or a combination of these.
3. The load adjustment board according to claim 1 , wherein said predetermined potential is a ground potential.
4. The load adjustment board according to claim 1 further comprising means for adjusting a length of wiring between the device and the connection pin.
5. A data processing apparatus comprising:
an expansion slot into which a board for expanding function of the device is inserted; and
the load adjustment board according to claim 1 , the load adjustment board being inserted into the expansion slot.
6. A data processing apparatus comprising:
an expansion slot into which a board for expanding function of the device is inserted; and
the load adjustment board according to claim 2 , the load adjustment board being inserted into the expansion slot.
7. A data processing apparatus comprising:
an expansion slot into which a board for expanding function of the device is inserted; and
the load adjustment board according to claim 3 , the load adjustment board being inserted into the expansion slot.
8. A data processing apparatus comprising:
an expansion slot into which a board for expanding function of the device is inserted; and
the load adjustment board according to claim 4 , the load adjustment board being inserted into the expansion slot.
9. The data processing apparatus according to claim 5 , wherein said expansion slot is a memory expansion slot.
10. The data processing apparatus according to claim 6 , wherein said expansion slot is a memory expansion slot.
11. The data processing apparatus according to claim 7 , wherein said expansion slot is a memory expansion slot.
12. The data processing apparatus according to claim 8 , wherein said expansion slot is a memory expansion slot.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000320885A JP2002132402A (en) | 2000-10-20 | 2000-10-20 | Load adjusting board and data processor |
JP2000-320885 | 2000-10-20 |
Publications (2)
Publication Number | Publication Date |
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US20020051350A1 true US20020051350A1 (en) | 2002-05-02 |
US6426879B1 US6426879B1 (en) | 2002-07-30 |
Family
ID=18799099
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/824,015 Expired - Fee Related US6426879B1 (en) | 2000-10-20 | 2001-04-03 | Load adjustment board and data processing apparatus |
Country Status (2)
Country | Link |
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US (1) | US6426879B1 (en) |
JP (1) | JP2002132402A (en) |
Cited By (16)
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US20080082750A1 (en) * | 2006-09-28 | 2008-04-03 | Okin Kenneth A | Methods of communicating to, memory modules in a memory channel |
US20080082732A1 (en) * | 2006-09-28 | 2008-04-03 | Vijay Karamcheti | Systems and apparatus for main memory with non-volatile type memory modules, and related technologies |
WO2008039886A2 (en) * | 2006-09-28 | 2008-04-03 | Virident Systems, Inc. | Main memory in a system with a memory controller configured to control access to non-volatile memory, and related technologies |
US20080082751A1 (en) * | 2006-09-28 | 2008-04-03 | Okin Kenneth A | Memory modules and programmable heterogeneous memory controllers for main memory |
US20080082734A1 (en) * | 2006-09-28 | 2008-04-03 | Vijay Karamcheti | Methods for main memory in a system with a memory controller configured to control access to non-volatile memory, and related technologies |
US20080082733A1 (en) * | 2006-09-28 | 2008-04-03 | Vijay Karamcheti | Methods for main memory with non-volatile type memory modules, and related technologies |
US20080082766A1 (en) * | 2006-09-28 | 2008-04-03 | Okin Kenneth A | Systems and apparatus with programmable memory control for heterogeneous main memory |
US20080094808A1 (en) * | 2006-10-23 | 2008-04-24 | Ruban Kanapathippillai | Methods and apparatus of dual inline memory modules for flash memory |
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US20090210636A1 (en) * | 2008-02-12 | 2009-08-20 | Vijay Karamcheti | Methods and systems for two-dimensional main memory |
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