problem simulating with standard cells

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2 total messages Started by "S. Badel" Wed, 16 Jul 2003 10:26

#3862

Author: "S. Badel"
Date: Wed, 16 Jul 2003 10:26

14 lines
470 bytes

i try to do post-layout simulation. my layout contains standard cells for
which the
full layout is not available, only an abstract layout view & schematic
(cmos_sch).
I extracted those cells as macro cells. The netlister generates errors
because
the abstract view contains pins for vdd! & gnd!, while the cmos_sch view
doesn't.
    "terminal 'gnd!' found in cell 'somecell' view 'layout'  does not exist
in cell 'somecell' view 'cmos_sch'"

how can i get around this?

Re: problem simulating with standard cells

#3881

Author: Kholdoun TORKI
Date: Sun, 20 Jul 2003 15:10

59 lines
1717 bytes

Stephane,

I don't understand why this happen again. It worked perfectly long
time ago with the design-kit under 4.3.4. But now with the 4.4.XXX
the problem is re-appearing as for the design-kit for 4.2.XX (very
long time ago).

Anyway, I have found a workaround that may help you :

Edit your "extracted" view and try this piece of code in
the CIW :

cv = geGetEditCellView()
foreach( Inst cv~>instances
   if( Inst~>viewName == "abstract_mlvs"  then
      foreach( instanceTerminal Inst~>instTerms
       if(instanceTerminal~>name == "vdd!" then
        dbDeleteObject( instanceTerminal )
          )
       if(instanceTerminal~>name == "gnd!" then
        dbDeleteObject( instanceTerminal )
          )
      Inst~>instHeader~>viewName = "symbol";
       )
     )
)
auLvsFixTimeStamps(cv)
dbSave(cv)

If you are using the "abstract" views for the instances in your
layout, you have to replace this in the 3rd line above.

I'm sure that there is a more elegant and standard way to do,
and I'm interrested if someone knows.

Regards,

================================================================
Kholdoun TORKI
http://cmp.imag.fr
================================================================

S. Badel wrote:
> i try to do post-layout simulation. my layout contains standard cells for
> which the
> full layout is not available, only an abstract layout view & schematic
> (cmos_sch).
> I extracted those cells as macro cells. The netlister generates errors
> because
> the abstract view contains pins for vdd! & gnd!, while the cmos_sch view
> doesn't.
>     "terminal 'gnd!' found in cell 'somecell' view 'layout'  does not exist
> in cell 'somecell' view 'cmos_sch'"
> 
> how can i get around this?
> 
>

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