set_input_transition in prime time

[honey13]

What is the better way to set input_transition?Is it the way to select a buffer as driving cell on all inputs or explicitly specifying the value by using set_input_transition command. If we want to specify the value how we need to calculate this value.

 

[pavanks]

Its better to specify the value using set input transition. Top level designer will give u this.
If u dont have then the second option would be set_driving_cell command.

 

[honey13]

I am working for testchips. We dont have any information about the top level design with which my testchip is going to integrate. Please suggest me what will be the better approach.

 

[iamluqi]

find one in the tech lib and scale it down somewhat

 

[dftrtl]

Generally guidelines are defined what should be the output driving cell. Once you know that you can use that cell as the driving cell for your inputs.