Stats

  • Locked Locked
  • Replies 5
  • Subscribers 92
  • Views 19792
  • 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

Max tran violations

diablo

Pls suggest on improving max tran violations in SocEncounterafter after routing. After postCTS, there are no violations on setup, hold, max_tran, max_fanout. However, after post route, I can see around 100 of max_tran violations but there is still no setup and hold violations. After iteratively running  optDesign -postRoute -drv, i still get those violations. I was wondering why the tool is not using buffers to fix it. 

Parents

  • When Encounter does not fix violations, it is usually due to the fact that fixing the violation would either violate some other higher priority constraint or the design is overconstrained. For example, if the violating transition is on an output port, check the load on the output port in the constraints file. It may be that the load is so high that the design is incapable of driving the load to the desired transition time.

    • Check your constraints file to see if you are overconstraining the design.
    • Use "setOptMode -verbose true". This tells Encounter to give a more detailed report during optimization.
Reply

  • When Encounter does not fix violations, it is usually due to the fact that fixing the violation would either violate some other higher priority constraint or the design is overconstrained. For example, if the violating transition is on an output port, check the load on the output port in the constraints file. It may be that the load is so high that the design is incapable of driving the load to the desired transition time.

    • Check your constraints file to see if you are overconstraining the design.
    • Use "setOptMode -verbose true". This tells Encounter to give a more detailed report during optimization.
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.