[Magic-dev] Re: "staged" design rules

[R. Timothy Edwards]

Dear Mark,

> 	I don't think "staged" is the best term but that's all I 
> could come up with right now.  Basically I have run into the
> issue where I have some design rules that look at large distances,
> say pad rules, or wide metal rules.  Philippe pointed out that
> these can really slow down the DRC since it has a lot of rectangles
> to check when the grid size is small.
> 
> It might be nice if there was a way to turn on/off select rules.
> In my "vision" rules could be tagged in the techfile (perhaps
> by putting them in a special sub section) to be checked
> or not checked.  This flag to check/not check could be set
> at the use discretion back and forth as the need to check 
> these rules arose.
> 
> Not knowing anything about the internals of magic this may 
> be a nightmare to code, but I though I would toss it out
> there anyway.

You're in luck---it's already done!  About a month or two ago, I
added the ability to put "styles" sections into the DRC block of
the techfile, and at the same time implemented the "variants" option
(the style subsection also takes a "scalefactor" line that lets you
define a scaling between DRC units and magic's internal units, so you
can put in vendor DRC rules in standard units).

I use it for just the reason you cite.

-----------------------------------------------------------
drc

  style xxxx035xxx  variants (drc),(stress),(varactor),(all)

  scalefactor 175

    .
    .
    .
  variants (stress),(all)

    maxwidth *m1,rm1,m1p 35000 bend_ok \
    "Metal1 > 35um requires slotting"

    .
    .
    .
  variants *

--------------------------------------------------------------

						---Tim

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| Dr. R. Timothy Edwards (Tim)   | email: tim.edwards at multigig.com     |
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