( ESNUG 468 Item 7 ) -------------------------------------------- [09/13/07]
Subject: ( ESNUG 467 #3 ) That DC "bad logic" bug was in version 2006.06
> Yes, DC did create bad logic. We struggled together with the Synopsys R&D
> folks to figure out the root cause. We were given multiple patches, but
> the bug persisted. Due to lack of time, we couldn't afford anymore
> debugging and switched to BlastCreate. Synopsys claimed that it was a
> "ghost bug" which appeared once in a while. Unfortunately, in our case,
> on that specific design it happened every time.
>
> - Jay Pragasam
> PLX Technology Sunnyvale, CA
From: Linming Jin <ljin=user domain=brocade not calm>
To: Akhil Bagri <akhil.bagri=user domain=synopsys not calm>
Hi, Akhil,
I'd appreciate if you can get the detail of "bad logic". What is the DC
"ghost bug"? Is it fixed?
- Linming Jin
Brocade Communications San Jose, CA
---- ---- ---- ---- ---- ---- ----
From: Akhil Bagri <akhil.bagri=user domain=synopsys not calm>
To: Linming Jin <ljin=user domain=brocade not calm>
Sure, Linming! Let me look into it.
I believe this Star to be more then a year old that has already been fixed.
Anyhow, I will get back to you with more details on it.
- Akhil Bagri
Synopsys, Inc. Mountain View, CA
---- ---- ---- ---- ---- ---- ----
From: Akhil Bagri <akhil.bagri=user domain=synopsys not calm>
To: Linming Jin <ljin=user domain=brocade not calm>
Hi, Linming,
I was able to gather some more information on that bad-logic bug.
As I mentioned earlier, it is over a year old and was reported with the
2006.06 release. The bug was fixed in 2006.06-SP1 release. And, the
workaround was to not run "simplify_constants -boundary" command before
compile_ultra.
- Akhil Bagri
Synopsys, Inc. Mountain View, CA
---- ---- ---- ---- ---- ---- ----
From: Linming Jin <ljin=user domain=brocade not calm>
To: John Cooley <jcooley=user domain=zeroskew not calm>
Hi, John,
I was concerned about this bad logic "ghost" DC bug. Here is the response
from my Synopsys AE.
- Linming Jin
Brocade Communications San Jose, CA
---- ---- ---- ---- ---- ---- ----
From: John Cooley <jcooley=user domain=zeroskew not calm>
To: Linming Jin <ljin=user domain=brocade not calm>
Hi, Linming,
Thanks for forwarding the follow-ups on this. It's good to know that it's
an old DC bug plus to have its workaround!
- John Cooley
ESNUG/DeepChip.com Holliston, MA
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