Re: X values in ASIC
- From: "Mike Lewis" <someone@xxxxxxxxxxxx>
- Date: Fri, 27 Jul 2007 09:53:37 -0400
"Akhil" <akhileshpatil@xxxxxxxxx> wrote in message
news:1185516060.325876.251820@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Hi,
I just overheard about a kind of standard lib component F/F, which are
used to "smash" X-values at the module level boundary.
This components are said to have a quality of either pushing "0" or
"1" at the outputs instead of "x" or "X".
I would like to request you all, to throw some light on this. As I
searched in Google it did not result in any kind of convincing
information.
Please reply.
Akhilesh
Well, in the real world there really isn't such a beast as "X". Everything
is either a "1" or "0". Sometimes you may not know whether its a "1" or "0"
... in virtual land that is one of the things that "X" tells you. SInce there
is no "X" in the real world where real library components are used, then I
do not believe there is such a library cell that banishes this condition.
You can always edit the models for the cell libraries such that they don't
produce an "X" anymore. You can also edit the SDC files so that timing
violations no longer occur as well (that is another cause of the wicked
"X").
Mike
.
- References:
- X values in ASIC
- From: Akhil
- X values in ASIC
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