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failing to declare pins as global signals (Read 1548 times)
Dipankar
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failing to declare pins as global signals
Jul 30th, 2009, 3:59pm
 
Dear Sirs,

                 I am using a CDK whose cells have schematic, symbol, layout and functional (verilog) views. Now for all the cells sch view has VSS and VDD inout pins (not globals)  but the symbol views don't have them. My problem is I am failing to declare VDD and VSS as global from ADE. When I use functional view of those cells, simulation(AMS)  goes smoothly, but when I use schematic  view of those cells simulation fails just because the cells' power grnd pins are not getting the desired voltage supposed to get passed  to them from TOP testbench. Please advise.
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With Thanks and Regards,
Dipankar.
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Andrew Beckett
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Re: failing to declare pins as global signals
Reply #1 - Aug 15th, 2009, 1:19am
 
So do the pins on the schematic have inherited connections? If they're not global signals, and they're not inherited connections (i.e. have net expressions on them) it's rather hard to see how you'd connect to them.

The AMS netlister should handle inherited connections OK.

I think you'll need to give some more details - perhaps some pictures - for us to be able to help. At least to avoid me having to anticipate every possible scenario you might have...

Best Regards,

Andrew.
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