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 external delay  

Last post Fri, Mar 28 2014 6:18 AM by grasshopper. 1 replies.
Started by IBKRAJU 03 Mar 2014 08:54 AM. Topic has 1 replies and 3577 views
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  • Mon, Mar 3 2014 8:54 AM

    • IBKRAJU
    • Not Ranked
    • Joined on Fri, Sep 7 2012
    • Posts 1
    • Points 20
    external delay Reply

    is externa dealy input is equel to settting setup time ?

    external_delay –clock [find / -clock clock1] –input 200 -name in_con \
    [find /des* -port ports_in/*] 

    externa dealy output is equel to settting hold time ?

    external_delay -clock [find / -clock clock2] –output 400 -name out_con \
    [find /des* -port ports_out/*]

     

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    • Post Points: 20
  • Fri, Mar 28 2014 6:18 AM

    • grasshopper
    • Top 25 Contributor
    • Joined on Thu, Jul 17 2008
    • Chelmsford, MA
    • Posts 242
    • Points 3,205
    Re: external delay Reply

    Hi IBKRAJU,

    that is a reasonable  way to look at it. I am just a little hesitant to define that way since many crazy things can be done with constraints. I certainly would not define output delay as 'hold'. If anything it is more like ck->q. input delay is the amount of time taken away from the driver whereas output delay is the amount of time taken away from the load side.

    hope this helps,

    gh-

    • Post Points: 5
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Started by IBKRAJU at 03 Mar 2014 08:54 AM. Topic has 1 replies.