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using command ncverilog cause hang issue

Jack Lee
Hi, I am Jack.I have something to verify about the ncverilog command.

I write the ncverilog command to compile and simulate my design:ncverilog   abc_tb.v -f abc_tb.f -l abc_tb.log  +ncelabargs+"-timescale 1ps/1ps" +access+rw(abc_tb.f is the filelist which contains all files required for this design) I face hanging issue while running simulation, when I remove the option +access+rw, the hang issue can be avoided.Why this can be happened?I have tried out with other tools like VCS, I have not experienced this type of issue, thanks for giving me some advices.
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  • Hi Inan,

    The introduction of PLI is another layer of complexity to determining the cause of a hanging simulation.  The way the simulator works with a PLI is when a PLI is encountered, control is passed to the PLI to execute it's function.  Once the PLI completes its code processing, control is given back to the simulator. So another possible source of the hang could be the coding within the PLI.

    I would encourage you to check with Synopsys to make sure that you have the latest version of their PLI.  I'd also make sure that the latest IUS version is being used.  You should also open a service request with Synopsys as well as our support team (support@cadence.com) and include a testcase so that the situation can be investigated.

    Best regards,
    Mickey 

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  • Hi Inan,

    The introduction of PLI is another layer of complexity to determining the cause of a hanging simulation.  The way the simulator works with a PLI is when a PLI is encountered, control is passed to the PLI to execute it's function.  Once the PLI completes its code processing, control is given back to the simulator. So another possible source of the hang could be the coding within the PLI.

    I would encourage you to check with Synopsys to make sure that you have the latest version of their PLI.  I'd also make sure that the latest IUS version is being used.  You should also open a service request with Synopsys as well as our support team (support@cadence.com) and include a testcase so that the situation can be investigated.

    Best regards,
    Mickey 

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