Method and apparatus for sizing buffers to provide minimal skew

Details Method and apparatus for sizing buffers to provide minimal skew Method and apparatus for sizing buffers to provide minimal skew

1996-07-01

1998-08-25

Teska, Kevin J.

Boots, shoes, and leggings

364489, 364490, 364491, 364578, 371 1, 395500, G06F 1900

Patent

active

057989354

ABSTRACT:
Disclosed is a system for automatically generating tables of buffer data which can be used during integrated circuit design to select appropriate buffers for signal distribution networks. The generated buffer data may be used by automated place and route systems to generate signal distribution networks having minimal skew. In the table, incrementally varying network features or criteria are provided (in the form of a table or list for example). Examples of such features include the length of a line connecting an L4 buffer to one or more L5 buffers and the number of L5 buffers driven by a single L4 buffer. For each incremental value of the network feature or features, one or more buffer types is specified. These buffer types have been previously modeled in the environment of the incremental value of the network features and found to meet certain criteria necessary to minimize skew. If when designing a signal distribution network the designer (or design tool) chooses L4 buffers from the proper locations on the table, then skew should be minimized.

REFERENCES:
patent: 5208764 (1993-05-01), Rusu et al.
patent: 5309035 (1994-05-01), Watson, Jr. et al.
patent: 5638291 (1997-06-01), Li et al.
"Zero Skew Clock Routing With Minimum Winelength" Ting Hai Chao et al. 1992 IEEE, pp. 799-814.
"A Zero Skew Clock Routing Scheme for ULSI Circuits" Ying Meng Li et al., 1992 IEEE pp. 458-463.

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