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Explorer
Explorer
264 Views
Registered: ‎07-10-2013

Simulator Waveform Display Anomaly

When using Vivado 2019.1 and simulating some Verilog code, SimA.png shows display of an 8-bit value, wOut_CtrlStatus, which has been expended to show the individual bits (display lines 18..26).  On the line above is shown wCtrlStatusErr, which in the code is an assign equal to (|wOut_CtrlStatus[7:1]).  The display shows that wCtrlStatusErr is asserted as expected whenever any of the upper seven bits of wOut_CtrlStatus are true.

SimB.png shows the display result after a single click on the waveform-magnify button.  It can be seen that wherever wCtrlStatusErr had shown an assertion in SimA, here instead is shown an X (red) value.  Note that none of the wOut_CtrlStatus bits are ever X during the times being displayed (and with no display of X values occurring for any magnification level).

Two apparent bugs: a) The display changes significantly when magnification is changed; b) X values are being indicated improperly.

SimA.png
SimB.png
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Moderator
Moderator
186 Views
Registered: ‎09-15-2016

Re: Simulator Waveform Display Anomaly

Hi @chsdkj ,

On which OS are you working upon? Can you please share the archived project to check this is issue at my end.

Thanks & Regards,
Sravanthi B
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Explorer
Explorer
173 Views
Registered: ‎07-10-2013

Re: Simulator Waveform Display Anomaly

Sravanthi B,

The OS is Windows 10 Pro.  I have attached the archived project ZIP file.

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