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 A warning when doing timing-driven NanoRoute, Urgent! 

Last post Fri, Jun 20 2008 10:05 AM by archive. 4 replies.
Started by archive 20 Jun 2008 10:05 AM. Topic has 4 replies and 2763 views
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  • Fri, Jun 20 2008 10:05 AM

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    A warning when doing timing-driven NanoRoute, Urgent! Reply

    #Total number of DRC violations = 2
    #Total number of violations on LAYER M1 = 2
    #Total number of violations on LAYER M2 = 0
    #Total number of violations on LAYER M3 = 0
    #Total number of violations on LAYER M4 = 0
    #Total number of violations on LAYER M5 = 0
    #Total number of violations on LAYER M6 = 0
    #Total number of violations on LAYER M7 = 0
    #Total number of violations on LAYER M8 = 0
    #option droute_honor_min_feature is default to true
    #    because min feature/manufacturing grid is defined in the library
    #Analyzing pin access.
    #Done analyzing pin access.
    #WARNING (NR) No sdc file was imported, Timing Analyzer is not called.
    #WARNING (NR) Total 176 pins do not have the noise margin specified, in which 176 pins are IO pins. Default rise/fall noise margins 0.400000/0.500000 have been used.
    #    48 out of 48 nets are selected for further SI-fixing!

    Above is an excerpt from nanoroute log file, the red characters means SDC file is not imported? But I never see setNanoRouteMode can set which SDC file to use. How can I make this WARNING disappear? Need help

    BRs


    Originally posted in cdnusers.org by eminemshow
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  • Fri, Jun 20 2008 10:20 AM

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    RE: A warning when doing timing-driven NanoRoute, Urgent! Reply

    I would think nano would grab the SDC file already loaded in the FE session. Did you by chance load the design without the SDC file? Also, have you compared results of timingDriven nano to non-timingDriven? We usually turn on SI prevention, but leave timingDriven off.

    - Kari


    Originally posted in cdnusers.org by Kari
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  • Fri, Jun 20 2008 12:08 PM

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    RE: A warning when doing timing-driven NanoRoute, Urgent! Reply

    Kari,

    I am sure that my FE session has SDC file loaded, because I should 1st use 'writeDesignTiming' to dump a timing graph file. I am really confused why this warning happens, is this a bug? (I guess). Anyway, thank you for your reply *^.^*

    BRs


    Originally posted in cdnusers.org by eminemshow
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  • Fri, Jun 20 2008 2:29 PM

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    RE: A warning when doing timing-driven NanoRoute, Urgent! Reply

    What version do you see this in? It appears to be a bug in older versions, where this message was printed, but the SDC is in fact read in and timing-driven routing is still performed. In the rest of the route log, do you see timing numbers?

    - Kari


    Originally posted in cdnusers.org by Kari
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  • Fri, Jun 20 2008 7:57 PM

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    RE: A warning when doing timing-driven NanoRoute, Urgent! Reply

    Posted By Kari on 6/20/2008 2:29 PM
    What version do you see this in? It appears to be a bug in older versions, where this message was printed, but the SDC is in fact read in and timing-driven routing is still performed. In the rest of the route log, do you see timing numbers?

    - Kari

    I am now using SOC-E 52 update 5. This version of Encounter also will issue a warning if I didn't give it the '.timing.tif' file, that why I use the 'writeDesignTiming' command 1st to generate a timing file. By the way, I didn't see any timing numbers after NanoRoute, just see a WNS at the very beginning of the globalDetailRoute phase, I think this is the result NanoRoute parsed from the '.timing.tif' file.

    BRs


    Originally posted in cdnusers.org by eminemshow
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Started by archive at 20 Jun 2008 10:05 AM. Topic has 4 replies.