( ESNUG 299 Item 1 ) ---------------------------------------------- [9/21/98]
Subject: ( ESNUG 297 #5 ) PowerMill "spFactor" & L-U Matrix Factorization
> spFactor is a L-U matrix factorization function in a sparse matrix
> package -- evidently PowerMill uses "sparse" from Berkeley. Looking at
> the version of "sparse" that I have, error=3 corresponds to a singular
> matrix -- but the PowerMill authors could have changed the codes.
>
> So, do you get any topology error messages (loops of inductors/voltage
> sources, floating nodes) if you run the netlist in HSPICE? This would
> be an easy way to generate a singular matrix.
>
> PowerMill should give a bit more diagnostic help here...
>
> - Steve Hamm
> Motorola Austin, Texas
From: "Anil Gundurao" <akg@cypress.com>
John,
We had similar problems with TimeMill 5.1 when we had inductors in our
circuit. By using the following config command (as advised by Synopsys/EPIC)
we got around the error: set_sim_imna. (It applies the Modified Nodal
Analysis with ideal vsrc & inductors.)
- Anil Gundurao
Cypress
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