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info on timing corners is required

KVBABU

 Hi All,

Below is the information on various timing corners for which , i must close the timing.

Corner Voltage (V) Temperature (C) Process
BCCOM 0.99 0 FF
LTCOM 0.99 -40 FF
MLCOM 0.99 125 FF
NCCOM 0.9 25 TT
WCCOM 0.81 125 SS
WCLCOM 0.81 -40 SS
WCZCOM 0.81 0 SS

i wanted to know which corner is the worst of all and best of all and why?
what is the relation between delay and temparature ?
Bcz, when i tried worked previously, i have closed the timing for 3 corners simply and delay increases with temparature in worst case. But, now i have 3 corst case corners with different temparatures. But, the delay seems to be more in WCL , even though the temp. is less when compared to remaining two corners. Please calirfy my doubts.
Regards,
K.VISWANADH BABU

  • Kari

     Which corner is worst for you may depend on your library and your design. We have seen that at the smaller nodes, the "temperature inversion" corners do show a lot of violations (meaning wc with a low temp, or bc with a high temp). So I'm not surprised at what you're seeing. It just highlights the need to use MMMC to check all of the relevant corners. As you go through your design, you may see that some particular corners are not troublesome, and you could leave them out of your active views until a final signoff check at the end.

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