How is OCV timing analysis done with a single library?

[snr_vlsi]

hi,

can anyone share how OCV timing analysis is done with a single library (suppose max lib). What is the derating factor to be set for a process node like 180nm.

How is set up and hold analysis carried out.

Thanks

snr_vlsi

 

[lakshman.ar]

ocv

the derating percent to be set would be a flat 10% !

Added after 1 minutes:

For more details abt OCV, the PT manual is the bset to refer !
Its explained in detail in the PT manuls with Examples !!

jus brwse thru the forum for hte PT manuls in case u dnt have !

 

[madhuvallem]

Re: ocv

PrimeTime offers three analysis modes with respect to operating conditions, called the single, best-case/worst-case, and on-chip variation modes:

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In the single operating condition mode, PrimeTime uses a single set of delay parameters for the whole circuit, based on one set of process, temperature, and voltage conditions.
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In the best-case/worst-case mode, PrimeTime simultaneously checks the circuit for the two extreme operating conditions, minimum and maximum. For setup checks, it uses maximum delays for all paths. For hold checks, it uses minimum delays for all paths. This mode lets you check both extremes in a single analysis run, thereby reducing overall runtime for a full analysis.
*

In the on-chip variation mode, PrimeTime performs a conservative analysis that allows both minimum and maximum delays to apply to different paths at the same time. For a setup check, it uses maximum delays for the launch clock path and data path, and minimum delays for the capture clock path. For a hold check, it uses minimum delays for the launch clock path and data path, and maximum delays for the capture clock path.

 

[malluenc]

Re: ocv

How to set the timing mode single/multi/OCV in pt_shell.

Thanks,
Mallikarjun