Timing violations after postRoute

[Ashokb431]

I am having Hold violations in my design after post route stage and my data path and clock path are completely optimized and i should not touch. how to fix these hold violations

 

[ThisIsNotSam]

there is no such thing as free lunch. hold fixes usually incur penalties... very often delay cells are added to slow down hold-critical paths.

you can go back one stage and perform your post route opt with a higher hold margin.
you can also run a dedicated Hold Opt round. in Innovus, this is achieved with optDesign -postRoute -hold

 

[Collang2]

Is there any crosstalk delta?

 

[Ashokb431]

No, There is no crosstalk

 

[Khadeer]

there is no such thing as free lunch. hold fixes usually incur penalties... very often delay cells are added to slow down hold-critical paths.

you can go back one stage and perform your post route opt with a higher hold margin.
you can also run a dedicated Hold Opt round. in Innovus, this is achieved with optDesign -postRoute -hold

Still there exist certain hold mode violations after using the command optDesign -postRoute -hold.. What to do?

 

[ThisIsNotSam]

Apply engineering skills, rinse and repeat. Earn your salary!