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Printed wiring board and information processing apparatus

A printed wiring board and wiring technology, applied in the secondary processing of printed circuits, printed circuits, printed circuits, etc., can solve the problem of difficult to become wiring length, etc., and achieve the effect of high waveform quality

Pending Publication Date: 2022-01-25
HITACHI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Furthermore, in order to alleviate the crosstalk, it is necessary to leave a large space between each wiring, so as a result, it is difficult to achieve the prescribed wiring length

Method used

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  • Printed wiring board and information processing apparatus
  • Printed wiring board and information processing apparatus
  • Printed wiring board and information processing apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0029] Hereinafter, an embodiment example (hereinafter, referred to as "this example") of the present invention will be described with reference to the drawings.

[0030] [Structure of Information Processing Device]

[0031] figure 1 and figure 2 An outline of an information processing device including the printed wiring board of this example is shown.

[0032] figure 1 The illustrated information processing device 100 includes a printed wiring board 101 . One memory controller 110 and a plurality of memory elements 111 to 119 are directly mounted on the printed wiring board 101 . A plurality of memory elements 111 to 119 are mounted on both surfaces of the printed wiring board 101 . That is, in figure 1 In , only the memory elements 111 , 113 , 115 , 117 , and 119 mounted on the surface of the printed wiring board 101 are shown, and the memory elements 112 , 114 , 116 , and 118 mounted on the back surface of the printed wiring board 101 are not shown. This point is me...

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PUM

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Abstract

The invention provides a printed wiring board and an information processing apparatus. When a multi-point wiring connecting a plurality of memories is provided, signals can be well transmitted without extending the total wiring length of the multi-point wiring. In a printed wiring board, one transmitting circuit (110) and N (N is an integer of 3 or more) receiving circuits(111-119) are coupled by a multi-point wiring (102). First to N-th branch points (102a-102e) are provided in sequence in the multi-point wiring having one end coupled to the transmitting circuit. Wirings branched at the respective branch points are coupled to the respective receiving circuits. Here, a wiring length (TL0) from a coupling point of the transmitting circuit to a first branch point is configured to be longer than a wiring length (TL1) from the first branch point to the second branch point. Wiring lengths (TL2) (TL3) (TL4) between the adjacent branch points at and after a second branch point are configured to be shorter than the wiring length from the first branch point to the second branch point.

Description

technical field [0001] The present invention relates to a printed wiring board and an information processing device. Background technique [0002] A memory device mounted in an information processing device includes, for example, a plurality of SDRAMs (Synchronous Dynamic Random Access Memory) and a memory controller (controller LSI: Large Scale Integration) that controls writing and reading of the SDRAMs. SDRAM generally uses DDR SDRAM (Double-Data-Rate SDRAM). [0003] Multiple SDRAMs and memory controllers are mounted on a printed wiring board. [0004] Address (Add), command (Cmd), and control (Ctrl) signals are sent from the memory controller to each SDRAM in a wiring pattern formed on a printed wiring board called multi-drop wiring. In this case, the memory controller of the multi-drop wiring serves as a transmitting end, and the plurality of SDRAMs serve as a receiving end. [0005] When connecting the memory controller and a plurality of SDRAMs by multipoint wirin...

Claims

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Application Information

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IPC IPC(8): G06F13/16H05K1/18H05K1/02
CPCG06F13/1668H05K1/181H05K1/0296G11C5/063G11C5/04G06F13/16G06F13/40H05K3/28H05K2201/10098H05K2201/10159
Inventor 滨本悟朗植松裕大岛洋平百留摩耶
Owner HITACHI LTD
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