Community Custom IC Design Waveform file is empty?

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Waveform file is empty?

Woodhouse

For generating waveform, I did following steps:

a. Place an instance of "vsource" from "analogLib" in schematic
b. Set the "source type" to "pwl"
c. Specify the path for csv or txt file in the properties form

d. In ADE->Setup->Simulation Files specify the Include Path to include the directory which contains the tx.txt file.

tx.txt file:

0 1

0.5 1

1 0

In the log file, it shows a Error (CMI - 2197) : Waveform file 'tx.txt' is empty.

Any idea about this Error? I tried txt/csv/prn, but all failed.

Thanks,

Wood.

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  • Hi Wood,

    The only way I can reproduce that problem is if the tx.txt file is actually empty. If it contains the lines you mention, whether it's got DOS or Unix line endings, or blank lines between the rows, it works fine. Are you sure the file has been saved in the location in the path and is not really empty? Which IC subversion and spectre subversion are you using? The IC version can be found with Help->About in Virtuoso and the spectre subversion should appear at the top of the spectre log file.

    You should see in the spectre output  log a line like this appear (even if it fails with error):

    Time for NDB Parsing: CPU = 76.988 ms, elapsed = 128.895 ms.
    Time accumulated: CPU = 122.98 ms, elapsed = 128.898 ms.
    Peak resident memory used = 62.1 Mbytes.

    Reading file: /export/home/myuser/demos/OCEAN/Models/tx.txt
    Time for Elaboration: CPU = 139.979 ms, elapsed = 139.731 ms.
    Time accumulated: CPU = 262.959 ms, elapsed = 268.884 ms.
    Peak resident memory used = 69.6 Mbytes.

    and ADE should show the file name as a hypertext link. For me, if it's empty - clicking on the link causes ADE to tell me that it's empty. Otherwise clicking on the link will bring up another window showing the contents. So first is to check that it's really being included from the location you think it is, and the second is to see whether it is truly empty or not.

    It seems pretty unlikely that spectre would complain about a file being empty when it isn't. Reading PWL files has been supported for at least 25 years (almost certainly since the beginning of Spectre's life, so longer than that), so I'd be very surprised if this was broken.

    Regards,

    Andrew.

  • in reply to Andrew Beckett

    Many thanks, Andrew.

    The reason why this error happens is the WINDOWS-UNIX file conversion. 

    I checked those files in WINDOWS only, and then move them to UNIX. Those files moved to UNIX are not original files anymore because they are encrypted automatically. 

    Sorry for a silly question, my bad.

    Regards,

    Wood.

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  • in reply to Andrew Beckett

    Many thanks, Andrew.

    The reason why this error happens is the WINDOWS-UNIX file conversion. 

    I checked those files in WINDOWS only, and then move them to UNIX. Those files moved to UNIX are not original files anymore because they are encrypted automatically. 

    Sorry for a silly question, my bad.

    Regards,

    Wood.

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