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Eye diagram

nevinalex1234

 hi

I have been trying to plot eye diagrams in cadence. The command eyediagram(signal,start,stop,period) is the format. But i am not able to control the no of eyes in my diagram. Say i run my simulation from 0 to 10u and my input clk is 5Ghz, typically to get a SINGLE EYE, i should give 200p as period rite ? I have added a 25p, 25p rise time fall time for it. But the thing seems going crazy.

Any ideas whats bugging ?

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  •  The first picture does show a single eye - maybe you just want it shifted though? To do that, you could specify 50p as the start time. You could do the same thing with 100p chunks and shift it by half a rise time - maybe that's what you want?

    I don't see why the eye diagram needs to know about the rise time and fall time - it simple cuts the waveform up into 200p (or whatever period) chunks and overlays them.

    You can also use the eye diagram assistant in ViVA (Measurements->Eye Diagram) which has a form to allow you to set it up - it also supports an edge-triggered eye diagram (unless you're using early IC615 versions - you didn't say which subversion you're using - I know it must be IC615 something because that's the new graph I see).

    Regards,

    Andrew.

     

Reply

  •  The first picture does show a single eye - maybe you just want it shifted though? To do that, you could specify 50p as the start time. You could do the same thing with 100p chunks and shift it by half a rise time - maybe that's what you want?

    I don't see why the eye diagram needs to know about the rise time and fall time - it simple cuts the waveform up into 200p (or whatever period) chunks and overlays them.

    You can also use the eye diagram assistant in ViVA (Measurements->Eye Diagram) which has a form to allow you to set it up - it also supports an edge-triggered eye diagram (unless you're using early IC615 versions - you didn't say which subversion you're using - I know it must be IC615 something because that's the new graph I see).

    Regards,

    Andrew.

     

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