Signal transmission system

Abstract

The invention provides a signal transmission device for high-speed operations in a memory system. Due to the difference in transmission time caused by the positions of memory modules, setup times and retention times among all the memory modules are hard to be ensured. Clock signals and data signals passing through the memory system are output from a memory controller and the transmission times of the signals are kept consistent, thereby ensuring the setup time and retention time of each memory module and ensuring the high-speed signal transmission possible. When the data is received at a side of the memory controller, once receiving the clock signal output to the memory modules, the data is adopted according to the time limit thereof.

Description

[0001] This application is a divisional application of the application with the application number 200410032115.5, the application date is June 6, 1997, and the invention name is "signal transmission device". technical field [0002] The present invention relates to a signal transmission technology between components (integrated circuits are representative components) mounted in devices such as workstations and personal computers, and particularly relates to efficient technology in high-speed signal transmission. Background technique [0003] FIG. 3 shows an example of a memory circuit currently used in a workstation or a personal computer. [0004] 30 is a memory module mounted on a plurality of memory LSIs 31 , and 32 is a memory controller for controlling the memory LSI 31 , sending write data to the memory LSI 31 , receiving read data from the memory LSI 31 , and the like. [0005] In addition, in the memory controller 32, an integrated circuit is often used as the contr...

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Problems solved by technology

[0039] By this method, several kinds of speed-up can be achieved. However, if the size of the device is, for example, in the memory circuit shown in FIG. pd(max-min) The value of can not be ignored, so speeding up still becomes difficult

[0040] That is, as required for high-speed transmission, the influence produced by the difference in the signal propagation time from the memory controller to the memory module in the near range and the signal propagation time from the memory controller to the remote memory module becomes large, and in Difficulties in high-speed design of storage systems

[0041] The same problem does not depend on the memory system, but is caused by synchronizing with the clock and between the transmitting and receiving circuits that carry out signals, for example, the same occurs even for the processor bus in a multiprocessing system using multiple microprocessors The problem

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