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av_extracted to dispf/idspf conversion

msharma

I inherited an av_extracted view created by another designer for a cell. When I simulate this view and compare with another simulation with the idspf view that I generated, the waveforms are quite different. Is it possible to generate a dspf/idspf view from the av_extracted view? 

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  • Andrew Beckett

    No, that’s not possible. I’m not sure what the point would be?

    Andrew

  • msharma
    in reply to Andrew Beckett

    It is to replicate the simulation results with the two types of extracted views. idspf is faster to netlist but the simulation results need to match too.

  • Andrew Beckett
    in reply to msharma

    It is possible that if a foundry have not qualified DSPF output from Quantus they might be doing things in the extracted view generation which don't end up in the DSPF (or vice versa). This is fairly rare nowadays. More likely is that the extraction was done with different settings, but it would be worth checking. As far as the simulator is concerned though it shouldn't really matter - the DSPF gives Spectre a clear hint that it's post layout and hence can use post-layout optimisation strategies, but equally the netlist from an extracted view also gives Spectre the hint too - and so I wouldn't expect them to give (significantly) different results.

    Either way, there's nothing to convert extracted view to a DSPF-based approach.

    Andrew

  • msharma
    in reply to Andrew Beckett

    Hi Andrew,

    Thanks for the info.

    I was able to get reasonable match between av_extracted and file dspf (Simulation files). However idspf view is closer to the schematic simulation.

    For now I can run dspf file. But, I need to control the dspf view in the config view (hierarch editor) tree structure. i.e. some instances use dspf view, while others do not. My current configuration does not allow it.

  • Andrew Beckett
    in reply to msharma

    Given that both a DSPF file and the DSPF file within an idspf view should be the same I wouldn't expect this. I wonder whether something has gone wrong which means that the dspf_include for the idspf isn't working and it's reverting to the schematic.

    Assuming you are using recent IC (and Quantus) versions, please contact customer support (use the case menu to submit a support case after logging in).

    Andrew

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  • Andrew Beckett
    in reply to msharma

    Given that both a DSPF file and the DSPF file within an idspf view should be the same I wouldn't expect this. I wonder whether something has gone wrong which means that the dspf_include for the idspf isn't working and it's reverting to the schematic.

    Assuming you are using recent IC (and Quantus) versions, please contact customer support (use the case menu to submit a support case after logging in).

    Andrew

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