query regarding setup slack and hold margin

Status
Not open for further replies.

au_sun

Full Member level 2
Joined
Aug 5, 2004
Messages
147
Helped
15
Reputation
30
Reaction score
4
Trophy points
1,298
Activity points
1,184
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.




 

[/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.
 

Status
Not open for further replies.
Cookies are required to use this site. You must accept them to continue using the site. Learn more…