( ESNUG 359 Item 4 ) --------------------------------------------- [9/13/00]
Subject: Tools/Ways To Draw On-Grid 45 Degree Lines In Cadence Layouts
> Does anyone have a fix/work around for drawing diagonal lines in a Cadence
> layout, say on a metal layer, at a 45 degree angle but has the corners of
> the bends on grid?
>
> Currently I can draw the 45 no problem, but have to draw a polygon around
> the corners to get it to DRC etc... changing the grid spacing is not an
> option as it violates the technology rules.
>
> - A. Jale
From: Jos Hesdal <jos@hl.siemens.de>
My opinion is that there is no solution. Even the boundaries of the 45 path
are not on grid. That has to be, simple mathematics. The only thing you
can do is: draw polygons.
- Jos Hesdal
Siemens AG
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From: reb@cypress.com
Long ago we wrote our own tool (in Cadence Skill code) including that
capability. I'd expect some commercial tools may do it also (browse
Connections Partners on the Cadence site)? As a fun basic starting point,
develop a pcell to emulate the path (points, width, layer, grid, etc.) but
keep it on grid. (One of the 4.4.x releases has (will have?)
mouse-draggable "handles" on pcells? Anyone play with that yet?)
- Reb
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From: "Chuck King" <charles.a.king@intel.com>
There is a "fix" that is commercially available. You can find this at
http://www.stxcadware.com/ (a connections partner). They have written, in
SKILL, a series of programs one of which is called "polypath". Using that
program, you enter a path and when you have completed your entry the path is
converted into a polygon automatically, design rule correct and with the 45
degree angles made properly. The width of the 45 degree segment will be
slightly wider depending upon working grid and of course the square root of
2 issue.
This is not an endorsement of Stx Cadware, I am simply, as a fellow user,
offering a suggestion.
- Chuck King
Intel
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