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

Mike Jenkins (
Mon, 19 Jul 1999 15:24:54 -0700


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.

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

 Mike Jenkins               Phone: 408.433.7901            _____     
 LSI Logic Corp, ms/G715      Fax: 408.433.7461        LSI|LOGIC| (R)   
 1525 McCarthy Blvd.        |     |     
 Milpitas, CA  95035      |_____|    

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