Big wire mesh splitting method for maintaining original physical routing topologies

Abstract

The invention discloses a big wire mesh splitting method for maintaining original physical routing topologies. The method comprises the following steps of: converting a big wire mesh into a tree topological structure and finding a strategy point position; finding an incremental layout legalization point position of the strategy point position; finding an optimum cutting point position of originalphysical routing; and inserting a buffer unit at the incremental layout legalization point position and physically connecting the buffer unit with the optimum cutting point position. According to thebig wire mesh splitting method for maintaining original physical routing topologies, the buffer unit is inserted at the incremental layout legalization point position to split the big wire mesh into aplurality of sub-wire meshes satisfying requirements, and the newly inserted buffer unit is connected at the optimum cutting point to sufficiently reusing the original connection topology and physical routing of the wire mesh, so that the wire wrapping length can be decreased to the greatest extent and then the consistency of time delay estimation and physical realization of an optimization scheme is ensured.

Description

technical field [0001] The invention relates to the technical field of EDA design, in particular to the process of correcting large wire nets violating design rules in the ECO optimization stage. Background technique [0002] In order to ensure that the integrated circuit can work normally, it needs to pass the design rule check to ensure that the design performance meets the requirements of various rules. In integrated circuit design, if a "big wire net" appears, the probability of not satisfying the delay constraints in the design rules will increase significantly. When a certain wire network has too long connection length or too many driving loads, it will interfere with signal transmission and affect the normal operation of the circuit. [0003] Net splitting, that is, driving segmented nets by inserting buffer cells, is a common method to efficiently handle large nets. Typically, after the buffer unit is inserted, the physical wiring of the driver unit to the buffer u...

AI Technical Summary

Problems solved by technology

However, under the advanced process conditions of 28nm and below, the impact of physical wiring on delay calculation is increasing

Moreover, for the same wire network connection, the timing delay will vary greatly under different physical routing methods, which causes a large difference between the estimated delay value of the traditional optimization scheme and the actual delay value obtained after physical implementation.

Even in extreme cases, latency issues that are expected to be successfully handled are still violated after rerouting

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