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stop & restart clock

Charanraj Mohan

Hi,

Just a question. Can b silly. How to stop the clock and start again in a transient time ?? Say, the whole clock time has same period, pulse width, tr, tf, td. I can do it in Vpwl, but the clock I am planning has more cycles :(

Thanks in advance.

Parents

  • Yes - you could have four inputs - one with each of the two clock frequencies, and then an enabling signal for each which would multiply the corresponding input. The coefficients will get a little complex with pvcvsp because you don't care about the higher order terms, but it's doable. 

    Simpler would probably just be to use two vcvsp in AND mode (as described above) with the outputs connected in series. Then you'll get the sum of the enabled two clock frequencies - assuming you only have one enabled at a time, that would do exactly what you want.

    Or you could use the bit source with a pattern which was of the form 1100 for the second part of the waveform.

    As always, there are many ways you can solve this kind of problem.

    Andrew.

Reply

  • Yes - you could have four inputs - one with each of the two clock frequencies, and then an enabling signal for each which would multiply the corresponding input. The coefficients will get a little complex with pvcvsp because you don't care about the higher order terms, but it's doable. 

    Simpler would probably just be to use two vcvsp in AND mode (as described above) with the outputs connected in series. Then you'll get the sum of the enabled two clock frequencies - assuming you only have one enabled at a time, that would do exactly what you want.

    Or you could use the bit source with a pattern which was of the form 1100 for the second part of the waveform.

    As always, there are many ways you can solve this kind of problem.

    Andrew.

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