LVS problem

[Allen]

I am designing a hugh circuit which has 600 transistors, the layout was
done by layout XL, it passed DRC and was extracted. However I got more
than 2000 LVS errors, more than 1500 are for "device doesn't not
match", I checked both schematic and layout carefully, the devices are
the same! Has anyone had such problems before? Thanks.

 

[mk]

On 25 Apr 2006 20:26:00 -0700, "Allen" <oceandai@hotmail.com> wrote:

I am designing a hugh circuit which has 600 transistors, the layout was
done by layout XL, it passed DRC and was extracted. However I got more
than 2000 LVS errors, more than 1500 are for "device doesn't not
match", I checked both schematic and layout carefully, the devices are
the same! Has anyone had such problems before? Thanks.

check your rule file, recognition rules and layers they refer to and
verify against which layers the layout uses and how devices are drawn
vs recognized.

 

[danmc]

have you verified that you can lay out a 2 transistor circuit and have
it pass LVS with your tools as configured and used? Start small.

Have you run LVS on your subcircuits? Surely you don't have 600
transistors in a single cell.

-Dan