Method for producing high accuracy delayed signal by using multiple signal source and its device

Abstract

The method for producing high-accuracy delayed signal by using multiple signal source includes the following steps: providing several signal sources; in which between any two adjacent signal sources its difference is a clock period; responsing said several signal sources to respectively produce first and second output signals in first and second times; making said output signals undergo the process of one logic operation treatment to obtain a delay signal. At the same time said invention also provides an aquipment for implementing said method. Said equipment includes a multiple signal soruce generation device, a signal source output selection device and a logic operation device.

Description

technical field [0001] The present invention relates to a method and device for generating delayed signals, especially to a method and device for generating high-precision delayed signals with multiple signal sources in a high-frequency working environment. Background technique [0002] As the working speed of the microprocessor becomes faster and faster, more and more problems are brought about in its design; among them, the signal synchronization problem between chips is an important subject to be solved at present. [0003] see Figure 1A , Figure 1B , respectively are an example diagram of a chip architecture taking three chips as an example and a schematic diagram of a comparison of signal waveforms. exist Figure 1A Among them, 10 is a delayed signal. In addition to directly generating the third cross-chip signal 13 for use by the third chip C3, the first chip C1 can also indirectly generate the first cross-chip signal 11 to the second chip C2, so that The second ch...

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Problems solved by technology

see again Figure 1B If it is required to input the second cross-chip signal 12 to the third chip C3 after a time length of t13, it must keep synchronization with the third cross-chip signal or maintain a certain time interval (for example, Figure 1B During the time length marked t23), because the second cross-chip signal 12 is generated by the first chip C1 after passing through the second chip C2, so in terms of actual implementation experience, the second cross-chip signal is really The time of transmission to the third chip C3 is not easy to grasp. The reason is that at least it includes output pad delay (PAD delay) or circuit board delay (PCB delay) and other process or layout design uncertain factors.

[0004] Based on this, the existing attempt is to set a delay cell (delay cell) (because it is a prior art, so it is not shown in FIG. 1 ) to generate a fixed delay signal into the first chip C1, and make the first chip C1 The method of delaying the chip C1 for a fixed time length t12 before generating and outputting the second cross-chip signal to the third chip C3 obviously cannot overcome the uncertain factors in the manufacturing process or layout design for the second cross-chip signal The impact of maintaining synchronization with the third cross-chip signal or maintaining a certain time off

This situation will be more serious in the high-frequency working environment, that is, once the uncertain factors in the process or layout design cause the gap between the second cross-chip signal and the third cross-chip signal When the time difference deviates from the original design, because the acceptable error range is low in the high-frequency working environment, this display will easily cause the third chip C3 to malfunction

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