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Hello,I am using SOC62 and the problem is that I want to consider couplingcapacitances (not xtalk effects) during "timeDesign -postRoute", but the RCextraction automatically performed by timeDesigndoes not consider these capacitances.1) How to force timeDesign to consider what is set by setExtractRCMode?I tried the following commands:######setExtractRCMode -detail -noReduce -coupled -noiseextractRCtimeDesign -postRoute -reportOnlytimeDesign -postRoute -hold -reportOnly######But I'm not sure if using this option(-reportOnly) timeDesign performsdelay calculation before timing analysis or if ituses previous calculated timing data.2) How to consider coupling capacitances, not crosstalking effects, duringtimeDesign -postRoute (considering native extraction)?Regards,Cristiano.
just make sure you have "setRCFactor -xcap ###". You can play around with the number to see the effect on your timing. You could use the spef from extractRC within SOC and the spef from you signoff tool and input both spefs into "ostrich" to get ###.li siang
Thanks lisiang,The fact is that command "timeDesign -postRoute" automatically set "setExtractRCMode -declouped" before running RC extraction and delay calculation.I did some tests and I think the only way to avoid it is running "timeDesign -postRoute -reportOnly" after extract coupling caps.Cristiano.
i am suprised that the -xcap will not have effect on time using just "timeDesign". Even with the -decoupled, the extraction should still calculate the xcap and then add it to the total gnd cap. Did you try different xcap value and check to see if it produce the same/different timing?li siang