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 custom measurement 

Last post Sat, Mar 17 2007 9:48 AM by archive. 6 replies.
Started by archive 17 Mar 2007 09:48 AM. Topic has 6 replies and 1218 views
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  • Sat, Mar 17 2007 9:48 AM

    • archive
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    custom measurement Reply

    i need help regarding custom measurement sigxp for

    setup
    hold
    rise time
    fall time

    i want to know the parameter which we can set in custom section of sigxp

    thanks in advance

    nikhil


    Originally posted in cdnusers.org by nikhilbny
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  • Fri, Mar 30 2007 9:16 AM

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    RE: custom measurement Reply

    I don't quite understand what you mean by "the parameter which we can set in custom section of sigxp".

    However, if you wish to have SigXp calculate the setup time, for instance, you will need to create the measurement expression that will do this for you. The setup measurement will be based upon

    1) the time your "strobe" crosses a reference point for the first time in any given cycle; your Data Strobe time.
    2) the time your data crossed the reciever in the previous cycle; your Prev Data Time.
    3) subtract Prev Data Time from Data Strobe.

    You will need three custom measurements to complete this task. One named Data_Strobe, one named Prev_Data_Time, and one named Setup. (Note: there is a multiplier in the equations (1e+009) to convert the results to nano-seconds instead of the default seconds the tool uses). (Also the reference voltage for the equations is 1.25 Volts. You will need to correct this to the value you wish to use).

    Your Data_Strobe custom measurement will be:

    product
    CrossingTime
    Strobe
    PkgPin
    1.25
    RiseOrFall
    First
    1e+009

    Your Prev_Data_Time custom measurement will be

    product
    RangeCrossingTime
    Reciever
    PkgPin
    0
    quotient
    Data_Strobe
    1e+009
    1.25
    RiseOrFall
    LAST
    1e+009

    And finally, your Setup custom measurement will be

    difference
    Data_Strobe
    Prev_Data_Time

    The other measurements you ask about can be created in a similar manner.


    Originally posted in cdnusers.org by kenk57
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  • Thu, Apr 5 2007 10:39 AM

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    RE: custom measurement Reply

    Try downloading the PCI Express Design Kit for some good/interesting examples of custom measurements. YOu can export those measurements and re-use them in your design too.

    Donald


    Originally posted in cdnusers.org by Donald Telian
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  • Sat, Apr 14 2007 11:33 PM

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    RE: custom measurement Reply

    Thanks

    i am looking for the same what u explain

    thanks once again

    Nikhil


    Originally posted in cdnusers.org by nikhilbny
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  • Sun, Apr 15 2007 12:28 AM

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    RE: custom measurement Reply

    Hi kenk57

    is there any application notes or tutorial available
    let me know

    nikhil


    Originally posted in cdnusers.org by nikhilbny
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  • Wed, May 30 2007 7:47 PM

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    RE: custom measurement Reply

    Hi Donald, IE always shows HTTP Error 403 when trying to download PCI Express Design Kit, could you tell me other way to download that Kit? Thanks, Xi


    Originally posted in cdnusers.org by xiliu
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  • Wed, May 30 2007 8:26 PM

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    RE: custom measurement Reply

    Xi,

    There was a problem with the download a couple weeks ago, but I heard it was fixed. I'll send a note to the people in charge of the links. They may contact you, and check back in a day or two.

    Donald


    Originally posted in cdnusers.org by Donald Telian
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Started by archive at 17 Mar 2007 09:48 AM. Topic has 6 replies.