DRC errors when switching tools

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Saran - 24 Aug 2005 20:51 GMT

Hi All,

Good morning. I am working on a project where I have to use some
layouts designed in Tanner tools. I converterd the layouts to gds
format and imported them back in cadence and so far so good! Everything
imports fine.

The DRC errors I am getting when I run a DRC on the layouts imported
confuses me a little. The first error was "Edge not on grid". I
displayed grid lines on my design window and I can see them off grid.

Why so, I am not able to figure out. I tried to find information about
it online...but nothing seems to help.

The second error was "active contact size, exactly: 0.60 x 0.60 um",
SCMOS Rule 6.1.

I can see that both these DRC failures correspond to submicron design
rules. The layouts in Tanner were originally in AMI ABN 1.5u and it was
saved to AMI C5 0.5u gds file. Now, the DRC I am using has submicron
rule design check.

Is there a way to fix these errors without having to redesign the
complete layouts? Is there any setting or changes I have to
incorportate?

Any help will be greatly appreciated.

Thanks a lot and Warmest Regards,
Saran

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Gerry Vandevalk - 30 Aug 2005 22:53 GMT

I think you first need to find out how they got off grid in the first place
...

You state that you started with AMI ABN 1.5u. What is the database grid
here?

You converted to AMI C5 0.5u. What is the database grid here?

If the second grid was an exact subset of the first grid, then everything
will stay on the grid.
(But may not be DRC correct.)

Since you get off grid errors, this may be the beginning of your problem.

I have written several custom tools to aid in this type of translation, but
it is not easy.

You can use a combination of strategies.

All of this depends on the layout style going in.

(My best success was to translate cell libraries with a different strategy
from routing and custom blocks)

Good Luck

-- Gerry

> Hi All,
>
[quoted text clipped - 26 lines]
> Thanks a lot and Warmest Regards,
> Saran

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Electronics Forum / CAD / August 2005

DRC errors when switching tools