Standard cell library having cell drive strengths selected according to delay
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United States of America Patent
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Sep 16, 2008
Grant Date -
May 18, 2006
app pub date -
Nov 15, 2005
filing date -
May 27, 2004
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Abstract
A cell library which enables reduced quantization over-design in large scale circuit design is provided. Library cells having the same cell function have drive strengths selected to provide delays about equal to a predetermined set of design delays, at a nominal load corresponding to the cell function. In contrast, conventional cell libraries typically have drive strengths which correspond to a predetermined set of cell physical areas. Preferably, the spacing between adjacent design delays is a non-decreasing function of cell drive strength. Such spacing reduces quantization induced over-design compared to conventional cell libraries which have a design delay spacing that is a decreasing function of cell drive strength. On-chip clock distribution is an important application where cell libraries of the invention can provide significant advantages.
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