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Minimum Capacitance Constraint-> why needed?

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ivlsi

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Hi All,

As for the Maximum Capacitance Constraint, it's understood...

But why the Minimum Capacitance Constraint does exist?

Thank you!
 

hoanglongroyal

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hi ivlsi,
min+max cap/trans, you need to set because that denote a range for tool STA to check. also, these limits to make sure have no extrapolated calculation (at least on in/out paths) , i guess that's just a recommend, not a requirement.
 

ivlsi

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Hm... it's understood for max capacitance... But why minimum capacitance restrictions/constraints are required? Why let's say a load capacitance could not be a zero?
 

hoanglongroyal

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hm.... let's talk about timing table of NLDM.
- you have 2 index : input trans and output cap.
- trans and cap in table have min (ofcourse non-zero) and max value --> it's defined as range
- as you understood : max is the upper limit / min is the lower limit --> they make sure have no extrapolated calculation (at least on in/out paths)
 
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    ivlsi

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