[Magic-dev] [Fwd: Magic7.3.107: GDS2 importation.]

[R. Timothy Edwards]

-------- Original Message --------
Subject: Magic7.3.107: GDS2 importation.
Date: Thu, 10 Aug 2006 13:40:28 +0100
From: Simon HARPHAM <SimonH at SiliconDevices.com>
Reply-To: SimonH at SiliconDevices.com
Organization: Silicon Devices (UK) Limited
To: tim.edwards at multigig.com

Hi Tim,
              not sure if I should send this to you or the forum, but here goes:

 > Yes, it is, so I'm forwarding it (without the attachment), along with my response.
 > It's a problem any number of users may encounter, so it is helpful to have the
 > question and the answer in the archive.

I have recently downloaded and installed v7.3.107 from
http://opencircuitdesign.com/cygwin/archive/magic_win.tgz
running under cygwin from:
http://sourceware.org/cygwin/
including the TCL/TK patch at:
http://opencircuitdesign.com/cygwin/archive/tcltk_x11_win.tgz
- these are installed on a Dell Inspirion PC running Windows XP
professional.


The feature I am getting is that sometimes when I read gds from another
source, I cannot see the layout contained in that gds - I get a blank
layout window.

I have attached two gds files - the first is the layout for tut3d
exported from Magic, which, when read back in, works fine (as you would
expect).

If I then import this (tut3d_magic.gds) file into WinLASI, then export
it (as Tut3d_lasi.gds) then read it back into Magic, it loads in but
Magic does not display the layout.

If I examine both the above gds files with StreamVista, or convert them
to dump files using Electric, then as near as I can tell, they are
identical  (a file compare shows the the dump files to be the same with
the exception of the names, create date and revision dates).

Interestingly, if I convert the dump file (Tit3d_lasi.txt) or the
re-export the Tut3d_lasi.gds from Electric (as TUT3D_electric.gds) both
files (only one, -lasi.gds > dump > -electric.gds has been provided)
read into magic ok.  The extracted spice netlists (for both -magic.gds
and -electric.gds) look a little different in terms of values, plus some
extra parasitic caps, but I don't see anything obvious that might be
causing the failure to read in.  The dump file from -electric.gds looks
identical to the dump from -magic.gds with the exception of  one line,
line 18 (of the attached TUT3d_electric.txt dump file):

17: aidname: project
18: userbits: 64

in the -magic.txt and -lasi.txt dump files "userbits" have been set to 0.

Any ideas what is wrong?

Cheers,
              SimonH.




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