Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

how to decide setup and hold margin on state timing analyze

Status
Not open for further replies.
F

feel_on_on

Full Member level 5
Joined
Apr 29, 2005
Messages
283
Helped
6
Reputation
12
Reaction score
4
Trophy points
1,298
Activity points
3,208
how to decide setup and hold margin on state timing analyze ？

How much margin can completely assure tapout sucessfully?
 

depends on which stage u are doing STA.
for eg; in prelayout stage 10% margin for setup and 0% hold will do .
 

thanks a lot , But you can assure 10% margin is okay ? if you select another process. then...postlayout stage how much margin I should keep?
 

Re: how to decide setup and hold margin on state timing anal

Well, 10% is not a magic number. I use 15% most of the time. Also, use aggressive wireload model in your early synthesis can take some wiring delay into the synthesis consideration, which will make post-layout timing closure somewhat easier.
 

but ,how to gain 15% ? if you have a bigger margin ,maybe make your design timing is not better?
 

Re: how to decide setup and hold margin on state timing anal

feel_on_on said:
but ,how to gain 15% ? if you have a bigger margin ,maybe make your design timing is not better?
Click to expand...


Set your clock period 15% shorter than your target. Bigger margin may result a little bigger block, but make your backend design easier.
 

So you won't ensure a better margin. only after you have taped out ,you can know if that is enough or too strict.
 

Set your clock period 15% shorter
Click to expand...
Why not to give 15% of setup uncertainly instead? What's the difference?
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top