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simulation preformence issue specman with C golden model

myonlyscreen

 Hi all 

I looking for advise on a preformance issue i am having.

I doing verification of a PHY module with specman and using a golden model of the design for checkers & debug aid.

over the time to ease the debug we exposed signals from the C model and injected them to signals in the test-bench via specman port .

in that we were able to look at waves both on the RTL signal and its equivalent reference signal.

all the simulation and the management of the C model is done by specman.

how ever we reached a sum of 7000 ports that specman inject from the C reference model , its realy slows the simulation.

after running profiler we saw that most of the time the cpu is busy in "flushing ports at end of tick".

i will be glad to hear some ideas on how to overcome this performance issue .

for now i am concentrating on reducing the number of ports.

Thanks in advence

Eyal.

  • Hello Eyal,

    Depending on the control of yourports, it might be possible to combine multiple values into
    one port (i.e. 4 bytes into a 32-bit bus) and drive that from SPMN to your DUT. Or you could
    implement some sort of RTL driver/BFM and send a whole transaction of values to that RTL
    code to drive to the DUT.

    Best regards,
    -hannes

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