difference between avant! slow.db and fast.db

[rakko]

TSMC .13u Library

Can anyone tell me the difference between avant! slow.db and fast.db. More specifically, which one to use for synthesis and which for layout? I can't find good reference to this in tsmc documents! Does tsmc have a document to explain this?

Thanks for any help.

 

[patrickli]

slow.db is for checking setup time. fast.db is for checking hold time.
when you synthesize , you shouls choose slow.db. after synthesize, you fix hold time using fast.db.

 

[philewar]

Can anyone tell me the difference between avant! slow.db and fast.db. More specifically, which one to use for synthesis and which for layout? I can't find good reference to this in tsmc documents! Does tsmc have a document to explain this?

Thanks for any help.

Hello,

slow.db means your design is runing at a worst case environment, i.e. high temperature, low voltage while fast.db means a best case where low temperature and high voltage. Process issues also play a part.

Generally speaking, circuits with fast run faster than those with slow.

What Patrick Li tells is right, too.

Best,

philewar

 

[nanako]

apart from slow and fast they have typical lib. also. to be safe, you can synthesis and run simulation with all the 3 lib. to ensure that timing is met.

 

[ala]

Re: TSMC .13u Library

Can anyone tell me the difference between avant! slow.db and fast.db. More specifically, which one to use for synthesis and which for layout? I can't find good reference to this in tsmc documents! Does tsmc have a document to explain this?

Thanks for any help.

slow.db is low power, hight temperature, checking setup time by primetime . fast.db is hight power low temperature, checking hold time when static time analisis.