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What exactly mean operating conditions

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gpremala

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waht is these conditions BCCOM, NCCOM, WCCOM and LTCOM
how different from another
which one i have to chose and when
 

BC***: Best case speed, i.e. high voltage, low temperature, fast nmos, fast pmos
NC***: Normal case speed, i.e. typical voltage, typical temperature, typical nmos, typical pmos
WC***: Worst case speed, i.e. low voltage, high temperature, slow nmos, slow pmos.

I'm not sure what LTCOM is.

I'm guessing the COM means commercial grade but it could mean something else depending on your vendor.

Typically when doing STA hold analysis BCS is assumed and when doing STA setup analysis WCS is assumed.
Simulations should be ran across all three corners: BCS, TYP and WCS.
 

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    gpremala

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LTCOM is basically having the worst case process and parasitics at lower temparature. It is basically setup critical corner.
 

Hi, I can understand why the design need to pass Best & Worst case. But why do we need to pass Typical test as well?
 

Sometimes we may have timing violations at typical corner, especially for hold time.
 

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