[Magic-dev] Broken Nets

[Satpal Singh]

I recently downloaded Magic 7.1 and am using the tech file 
SCN3ME_SUBM.30.tech27 to design for AMI 0.5 um process. On extraction (ext 
all) and running ext2spice to generate a netlist, I occasionally (not 
always) find that a single net in the layout has been broken into 2 
different nets in the spice file, this leads to the failure of simulation.

Sometimes by moving one of the cells in the design a bit, or changing the 
position of the label on some random net, seems to fix the problem, and at 
times it might create additional broken nets. Some of the nets which are 
broken involve a m1 to m2 connection, though I feel there may be other 
situations too.

In one of the situations I was able to get round the problem by reducing 
the step size in the extract section of the tech file from 100 to 50, but 
then it did not solve the problem for some other examples. This seems to be 
a random problem !

I would greatly appreciate if you can help.

Thanks,
Satpal Singh
Prime Circuits Inc.
301 286 7086