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davyzhu
Joined: 23 May 2004
Posts: 521
Helped: 3
Location: oriental
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 05 Jan 2007 3:36 DC timing violation, what to do first? |
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Hi all,
I am new to Synopsys DC. And I have a basic problem. When I find timing
violation in DC report, what shall I do first?
1. Shall I change the script of DC? To let the tools do something like
retiming?
2. Shall I change the RTL code? To pipeline the comb logic manually?
3. Other choice, please recommend.
What circumstance to do "1" or "2" or "1 and 2 at the same time"?
Best regards,
Davy
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gliss
Joined: 22 Apr 2005
Posts: 659
Helped: 61
Location: Boston Metro Area
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| 05 Jan 2007 3:43 DC timing violation, what to do first? |
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You should try 2 first of course. But some people would rather not do that because it is time consuming. They would rather have tools insert flops/buffers automatically or do some other tricks to close static timing.
Also, try using PrimeTime.
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rsrinivas
Joined: 10 Oct 2006
Posts: 418
Helped: 36
Location: bengalooru
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| 05 Jan 2007 5:37 DC timing violation, what to do first? |
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| if u have a clk which is more than required in ur script file decrease it by 10%(if acceptable) and try and compare the slack previously obtained
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satyakumar
Joined: 18 May 2006
Posts: 186
Helped: 11
Location: Bangalore
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| 05 Jan 2007 7:33 Re: DC timing violation, what to do first? |
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Hi,
There is also possibility of getting timing closure with increase in area and power constarints in DC scripts. If this is not possible then go for second option by redesigning the RTL.
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sumit_techkgp
Joined: 01 Apr 2007
Posts: 135
Helped: 3
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| 14 Apr 2007 5:05 DC timing violation, what to do first? |
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1. Check the contraints and exceptions again.
2. Check the logic overhead in failing paths
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