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I have macro cells in the design that have transition limit on a clock pins that is much lower than standard cells. In the ctstch file I have to define transition requirements SincMaxTran that is appropriate for standard cells but higher than that of the macro cells. As a result a few transition violations remain on clock nets connected to the macro cells - Cadence CTS optimizes transition based on a requirement in ctstch file without considering lib files. Do you have any automated solution to fix remaining transition violations, besides what I currently have in the flow is a fix by "Interactive ECO" ?
This is what the MacroModel syntax is created for. In your CTS constraints specification, you can specify a min and max rise/fall delay on the macro port (for all instances of a macro) or pin (instance specific). The syntax is: MacroModel port cellName/portName maxRise minRise maxFall minFall inputCap For example: MacroModel port myMacro/clk 10ns 5ns 12ns 7ns 20pf I have found that any units are OK but you must specify SOME unit (ps, ns, etc). Kevin