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Calculations with signal bus outputs in Cadence calculator

DKaraca over 4 years ago

Hi,

My question is as follows:

I run an ac test and save two signal buses in bundle form: /inp<1:32> & /inm<1:32>

Then I calculate the ac response of each:

Vinp=VF("/inp<1:32>")

Vinm=VF("/inm<1:32>")

Until this point, all is fine. I can plot Vinp & Vinm successfully (each having 32 traces).

However, the calculator fails to compute Vinp-Vinm (or any similar calculation).

Intuitively, I expect to get a new waveform family where each trace gives VF("/inp<N>")-VF("/inp<N>") for N=1:1:32

I suppose the problem is that "bit" variable in the two waveform families is not identical.

Could you please advise me about how to solve this?

My Cadence version is: IC6.1.7-64b.500.23

Thanks in advance.

BR,

Denizhan Karaca

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Andrew Beckett over 4 years ago

Hi Denizhan,

I tried this in the latest IC6.1.8 ISR (ISR14) and it fails there too - I can subtract a non-bussed net from a bus, but not one bus from another. This ought to be possible (in principle), so please contact customer support. It needs a fix from R&D, I believe.

Andrew.
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Andrew Beckett over 4 years ago

Hi Denizhan,

I tried this in the latest IC6.1.8 ISR (ISR14) and it fails there too - I can subtract a non-bussed net from a bus, but not one bus from another. This ought to be possible (in principle), so please contact customer support. It needs a fix from R&D, I believe.

Andrew.
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