Re: [SI-LIST] : Eye diagram displays from HSPICE simulations

Mike Jenkins (jenkins@lsil.com)
Mon, 19 Jul 1999 15:24:54 -0700

Chris,

Regarding your question about plotting eye diagrams in HSPICE, try
defining parameter(s) that are "sawtooth time", then plotting the
waveform versus one of these parameters. The general form is:

.probe Parm=par('BitTime+(time/BitTime-int(time/BitTime+Phase))')

where BitTime is the bit interval and Phase (0 <= Phase < 1) is
a time offset to center your displayed eye diagram. I define
several of these parameters, then choose the best one for display.

You also need to set a switch in AvanWaves to turn off the flyback
which will otherwise mess up the plot. (I think this is a setting
to plot points vs. plot lines, but don't recall.)

There's probably a slicker way, but this works. Hope it helps.

Regards,
Mike (not the Mike to which you addressed your question)

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