Stats

  • Locked Locked
  • Replies 1
  • Subscribers 91
  • Views 14099
  • 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

Setting Clock Input Transition Value When Pin Defined at Instance Output

JAUB

Quick CTS question (EDI 10.1.3) . When the clock root is defined at the output , such as
 
AutoCTSRootPoint   someInstanceName/Y
 
How do I set the input transition value for the clock root ? 

I cannot use RootInputTran in the clock spec file to specify the input transition at the clock root since the clock is not specified at an input pin/port.

The clock report shows  that CTS used the default root input tran value of 1ps which is way to fast for this design (periods for clocks 47ns and 100ns). 

  I recall seeing something about a setting/variable to tell CTS to take the driving cell into account to avoid using the default, but I cannot locate it in the docs or through online search.

 Any suggestions ?

 Thank You,

 

Jeff Aubert

 

Parents Reply Children
No Data

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.