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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 ?

Parents

  • hi andrew.. thankx a lot for elaborating in excellent detail.

    I am getting the following error for the above prbs.scs . I am stuck @ this point. 

     

    Notice from spectre during hierarchy flattening.

        v1: Invalid enumeration `prbs' used as value of parameter `type'.  Ignored.

    Error found by spectre during hierarchy flattening.

        v1: Waveform type must be specified if any waveform parameters are given.

     

     

Reply

  • hi andrew.. thankx a lot for elaborating in excellent detail.

    I am getting the following error for the above prbs.scs . I am stuck @ this point. 

     

    Notice from spectre during hierarchy flattening.

        v1: Invalid enumeration `prbs' used as value of parameter `type'.  Ignored.

    Error found by spectre during hierarchy flattening.

        v1: Waveform type must be specified if any waveform parameters are given.

     

     

Children
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