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So before looking to the setup/hold time report, you must have the trans/cap violations clean or so small than the impact is reduce.
It has to be - you report the setup/hold time for all paths which "don't" have a trans/cap violation....Or in other formulat, you report the setup/hold time for all paths which have a trans/cap violations and if the setup/hold time margin is important ignore the max/trans report.
Open a .lib (liberty) file, and the NLDM liberty model define a matrix of two axis (load & trans).thnks rca for responding i m new in backend please
what do yo mean by axes !! and where i can find the librairy timing !! :-(
and how we can corect the max tran/cap violation if they exist !!
thnks
Well by this was you are in very safe side, but if some cap/trans violations could not fixed, you could go to the setup/hold reports.So rca - Lets consider PT - so all you are saying is first of all check for Max trans/cap, fix it, and then you check setup/hold and fix it?? Am I interpreting it correctly?
At synthesis step, you cannot control the hold, as the clock tree is not done.Now if we go back to DC - Is the same holds true? I know that we'll not fix hold in DC (provided it is not huge) Can you please tell?
No, if you have some cap/trans violations which could not be fixing:It has to be - you report the setup/hold time for all paths which "don't" have a trans/cap violation....
Can to enlarge it? Thanks..
Open a .lib (liberty) file, and the NLDM liberty model define a matrix of two axis (load & trans).
During the placement, there are different optimisation step to fix the DRV (which include the cap & tran, and so one include the fanout).
During the check (PrimeTime for example), after the reports, there are some ECO command to fix the cap & trans, dump the modification in a file and read it back to the PnR tool.
- - - Updated - - -
i don't knew where i can find NLDM liberty !!
- - - Updated - - -
is that what you meaan rca !!
lu_table_template(table_32){
index_1(" 0.005, 0.028, 0.055, 0.11, 0.22, 0.44 ");
index_2(" 0.001, 0.0082, 0.0164, 0.0328, 0.0655, 0.131, 0.262, 0.523 ");
variable_1 : input_net_transition;
variable_2 : total_output_net_capacitance;