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query regarding setup slack and hold margin

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au_sun

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hi ,
In my ASIC design, after finishing layout i checked for the timing,
the static timing analysis gave a results as follows,

setup slack => 3326 ps,
hold slack => 10 ps,

the target frequency of this design is 40MHZ(ie 25ns time period)

my doubt is that the hold slack margin 10ps is it enough,
else what range of values the hold slack margin should
be obtained in order to get timing safe,
 

the value usually is equal to the clock skew. and you may add a little to be more safe. it depend on the process.
 

0.1ns may be safe
 

which analysis you did ,
Single , Best case/Worst case , or OCV .
0.1ns is usually acceptable .
By the way what is your tecnology ( 0.18 or more/ less)
 

I thinks the hold time margin must be greater than 0.2 ns.




au_sun said:
hi ,
In my ASIC design, after finishing layout i checked for the timing,
the static timing analysis gave a results as follows,

setup slack => 3326 ps,
hold slack => 10 ps,

the target frequency of this design is 40MHZ(ie 25ns time period)

my doubt is that the hold slack margin 10ps is it enough,
else what range of values the hold slack margin should
be obtained in order to get timing safe,
Click to expand...
 

hi ,
In my ASIC design, after finishing layout i checked for the timing,
the static timing analysis gave a results as follows,

setup slack => 3326 ps,
hold slack => 10 ps,

the target frequency of this design is 40MHZ(ie 25ns time period)

my doubt is that the hold slack margin 10ps is it enough,
else what range of values the hold slack margin should
be obtained in order to get timing safe,
Click to expand...
[/quote]

Set Up slack is too much , please provide the following details,
are u doing "worst" case or "best" case analysis also tell me , what is your technology (0.18 or below) . your target freq is not high.
check the timing reports and confirm with designers.
 

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