Repairing method of retention time violation

Abstract

The invention relates to a repairing method of retention time violation.The method includes: acquiring the starting point, ending point and violation value of a path with the retention time violation from the result of static time sequence analysis; secondly, selecting the ending point of the path with the retention time violation as the to-be-inserted node of a repairing unit, and inserting one buffer unit or delay unit at the to-be-inserted node during each repairing so as to reduce the influence of the repairing unit insertion on the time sequence of other paths; thirdly, search the physical position for unit placing near the node with the inserted repairing unit, releasing the space required by the repairing unit through the position of the original unit in mobile design, and setting a target function to allow the total cost of the mobile unit to be the lowest so as to achieve low disturbance to the original design; fourthly, generating corresponding repairing logic, placing units and the engineering change order of mobile unit positions; fifthly, rewiring the connection relation with the logic being modified, extracting parasitic parameters, and performing static time sequence analysis to guarantee that the retention time is repaired completely.

Description

technical field [0001] The present invention relates to a method for repairing hold time violations in high density physical designs. Background technique [0002] With the continuous use of large-scale and ultra-large-scale integrated circuits, the size of the process has been continuously reduced, and the mainstream process has reached 40nm, and it is constantly developing to a smaller and more advanced process. At present, the most advanced process size under research in the world is the process of Intel Corporation, which has entered the order of tens of nanometers. The speed at which smaller and smaller process sizes replace existing processes is constantly accelerating, which requires physical design engineers to continuously shorten the production cycle in order to have a place in the fierce competition, especially for the start-up of my country's integrated circuit industry. Relatively late, the current situation of weak technology, the country has introduced relevan...

AI Technical Summary

Problems solved by technology

[0005] In high-density physical design, the existing timing repair tools cannot find enough space to insert buffer units on the basis of high-density design, and cannot completely repair the hold time violation. The present invention proposes a hold time violation repair method, which completely repairs all hold time violations by moving the position of existing cells and inserting suitable repair cells

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