Stats

Locked Locked
Replies 3
Subscribers 91
Views 14250
Members are here 0

This discussion has been locked.

You can no longer post new replies to this discussion. If you have a question you can start a new discussion

SPEF differ between timeDesign and extractRC

steven2012 over 12 years ago

Hi Bob & Kari

I did the following things,why the spef from "timeDesign -signoff -si" is different to the spef from "extractRC".

1. spef_01.spef.gz (one way)

setExtractRCMode -engine postRoute -effortLevel signoff -coupled true -lefTechFileMap qrc.layermap

timeDesign -signoff -si

so,the spef file "spef_01.spef.gz" will be extracted.

2. spef_02.spef.gz (another way)

setExtractRCMode -engine postRoute -effortLevel signoff -coupled true -lefTechFileMap qrc.layermap

extractRC

so,the spef file "spef_02.spef.gz" will be extracted.

but,why there are slight difference between "spef_01.spef.gz" and "spef_02.spef.gz" and which is more suitable to use?

Thanks advance!

Best Regards.

Kari over 12 years ago

your second way does not include the SI analysis.
Cancel
Vote Up 0 Vote Down

Cancel
steven2012 over 12 years ago

Hi Kari
Thank you for reply.I think the option "-couple true" will force the command extractRC to
extract the si spef.
so,in my opinion the above two spef should be same,however there are subtle differences between them.
Cancel
Vote Up 0 Vote Down

Cancel
Kari over 12 years ago

My guess is that timeDesign -si triggers some other extraction variables/thresholds/etc. to be set, causing the small differences. But as I said that is a guess. If your flow is dependent on this, I would suggest filling a service request.
Cancel
Vote Up 0 Vote Down

Cancel

Community Guidelines

The Cadence Design Communities support Cadence users and technologists interacting to exchange ideas, news, technical information, and best practices to solve problems and get the most from Cadence technology. The community is open to everyone, and to provide the most value, we require participants to follow our Community Guidelines that facilitate a quality exchange of ideas and information. By accessing, contributing, using or downloading any materials from the site, you agree to be bound by the full Community Guidelines.