FreeLists / si-list / [SI-LIST] Re: EYE diagram mode in HSPICE

["Greim, Michael" <mgreim@xxxxxxxxxxxx>]

Hi Bob et al,

I can't say that I would refer to it as a mode, but 
I will tell you how to display eye diagrams in Awaves.
First you need to enter a couple of lines to your spice
deck to create a ramp function that will act as the time
line for your eye display.  What this does is as time goes 
from 0 till whenever you sim'd to, the timeline for the 
display will go from 0 till the period you want displayed
and then back to zero.  This results in drawing the display
over and over again, creating the eye.  You can create this
ramp many different ways.  I have included one that you 
can cut and paste into your file as desired.


----------------- Cut Here ---------------------------

.param per='2.572e-9' $desired eye diagram period
.param tsi='3.658n' $desired eye diagram start time
.probe tran
+eyetime1=
+par('.5*(sgn(TIME-tsi)+abs(sgn(TIME-tsi)))*(TIME-tsi-per*int((TIME-tsi)/per
))')

----------------- Cut Here ---------------------------

Once you have run your simulation and you have enterred 
awaves to see what you have, you need to replace your TIME
x axis with the ramp function.  Using the lines shown
above, you would go to the middle window that says Types
and click on params.  You will see eyetime1 appear to 
the right of this.  Click on eyetime1 in the curves window.
Directly beneath this you will see the Current X-Axis window.
Time is shown as the current X Axis.  Click on apply and 
par(eyetime1) will now become your x axis. When you display
your waveform it will now be in eye diagram format.  You 
may need to adjust tsi a few times to get the eye centered.

Hope this helps.  If you have any other questions, drop me 
a line and don't hesitate to ask.

best regards,

Michael Greim



-----Original Message-----
From: Bob Patel [mailto:whizplayer@xxxxxxxxx]
Sent: Monday, October 08, 2001 7:47 PM
To: si_list
Subject: [SI-LIST] EYE diagram mode in HSPICE



Hi! I had a question regarding Avanwaves the waveform
viewer tool with HSPICE and that is how do I display
an EYE diagram for continuous bit-stream of data?
Thanks in advance
Bob

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