How to specify minimum via cuts while autorouting in vcar?
By command its: circuit net net13 (use_via (use_array M2_M1 1 2) (use_array M3_M2 1 2) (use_array M4_M3 1 2) (use_array M5_M4 1 2)) I don't really know how to specify to all nets.
Daniel Oliveira wrote, on 08/20/09 16:31: In the past I've done this with: define (class ALLNETS *) circuit class ALLNETS (use_via (use_array M2_M1 1 2) (use_array M3_M2 1 2) (use_array M4_M3 1 2) (use_array M5_M4 1 2)) (apologies if line-wrapped). I think there's a better way of doing this in VCAR these days. A quick search in the "iccdlr.pdf" doc in the installation shows: The following design file example specifies at least 3 cuts for any connection to layer metal1 pins or wires greater than 2.0 microns wide, and 4 cuts for connections greater than 4.0 microns wide. (layer metal1 (type signal) (rule (minimumcut (width 2.0 numcuts 3) (width 4.0 numcuts 4))) ) So you can have width dependent rules on the minimum number of cuts, on each layer. Regards, Andrew.
Yours seems indeed like a better solution Andrew I only worked with VCAR 2/3 times so I do not know the tool well enough. Best Regards, Daniel
