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 Zero-width pulse problem 

Last post Wed, Jul 24 2013 12:30 AM by muffi. 1 replies.
Started by YauShk 24 Jul 2013 12:24 AM. Topic has 1 replies and 550 views
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  • Wed, Jul 24 2013 12:24 AM

    • YauShk
    • Not Ranked
    • Joined on Wed, Jul 24 2013
    • Hong Kong, 00-HK
    • Posts 1
    • Points 20
    Zero-width pulse problem Reply

    I have a simulation that generate a zero-width pulse. There are two waveform file. One is vcd. Another one is shm. Both waveform was dump in same time. When i using Simvision to open both waveform, the VCD waveform file show the icon of zero-width pulse on waveform. But the SHM wavefrom file doesn't show it.

    How can I set the Simvision showning the zero width icon?


    • Post Points: 20
  • Wed, Jul 24 2013 12:30 AM

    • muffi
    • Top 500 Contributor
    • Joined on Tue, Aug 4 2009
    • Bangalore, Karnataka
    • Posts 22
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    Re: Zero-width pulse problem Reply

     The yellow icon should have showed up in the shm database too. I am not sure why it isn't.

     You can dump event based waveforms. This will help in catching any glitches that might be generated from within the design.

    To dump the delta events you need to use the following TCL commands:

    ncsim> database -open waves -shm -default -event
    ncsim> probe -create -shm -all -depth all

    You can issue the above commands at the ncsim TCL console BEFORE running the simulation/sending signals to waveform window or you can put them in a file called input.tcl and provide this file to irun/ncverilog with -input option.

    > irun -input input.tcl <other options>

    To expand the time sequence:

        Go to the "Simvision Waveform WIndow"
        Go to "View" menu
        Go to "Expand Sequence Time"
        Go to "All Time"


    • Post Points: 5
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Started by YauShk at 24 Jul 2013 12:24 AM. Topic has 1 replies.