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How to suppress Spectre simulation for digital design?

Shengkui Gao
I am using Cadence 6.1.2 and NCSU_analog_parts library to do digital design. When I use spectre to simulate my circuit, it costs a long time (40 minutes at least) and a large file generated (more than 15MB). So I'd like to know how to suppress the simulation of Spectre？ Because I think it may do the full calculation for each part of my circuit. And do someone know how to set spectre to do the digital simulation directly? Now I have to generate the analog waveforms for each bits of my output and then use analog2digital function to transmit it to digital waveforms, then bus them... I am really a beginner in using Cadence 6 and Spectre, I used to use cadence 5 and generate to Hspice netlist, then go to use HPSICE or NANOSIM to do the simulation. Now the NCSU libraries does not support HSPICED models using in Cadence 6, I have to use spectre........
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  • Hi Shengkui

    a. Spectre can certainly simulate the schematic views of digital circuits that have actual transistors. It seems that you are building custom digital circuits. This means circuits that have actual transistors and not just a symbol encapsulating verilog/vhdl codes. You can simulate such circuits just as how you would simulate any analog/RF circuits.

    b. It is most likely because your spectre is of the wrong version. You can check it as follows:
    - Open a terminal window
    - Enter the following cmd "spectre -W" :
    unix>spectre -W

    You need a min spectre version of 7.0. If you need to upgrade your spectre, please install MMSIM package.

    No, it does not mean that you do not have licenses for spectre turbo. To check for licenses, you can use:
    unix>env | grep LM_LICENSE_FILE
    ( If you above does not work, try "env | grep CDS_LIC_FILE" )
    unix>lmstat -a -c output_of_previous_cmd

    c. This is the link to INCISIV92 package. Actually I think you only need the "IUS" part of the package but to avoid missing out any features when selecting them, I guess it would be easier to simply install everything. : )  It would take up quite a huge space though, about 14Gb. You can find out more about our AMS Designer simulator by clicking here.

    Best regards
    Quek

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  • Hi Shengkui

    a. Spectre can certainly simulate the schematic views of digital circuits that have actual transistors. It seems that you are building custom digital circuits. This means circuits that have actual transistors and not just a symbol encapsulating verilog/vhdl codes. You can simulate such circuits just as how you would simulate any analog/RF circuits.

    b. It is most likely because your spectre is of the wrong version. You can check it as follows:
    - Open a terminal window
    - Enter the following cmd "spectre -W" :
    unix>spectre -W

    You need a min spectre version of 7.0. If you need to upgrade your spectre, please install MMSIM package.

    No, it does not mean that you do not have licenses for spectre turbo. To check for licenses, you can use:
    unix>env | grep LM_LICENSE_FILE
    ( If you above does not work, try "env | grep CDS_LIC_FILE" )
    unix>lmstat -a -c output_of_previous_cmd

    c. This is the link to INCISIV92 package. Actually I think you only need the "IUS" part of the package but to avoid missing out any features when selecting them, I guess it would be easier to simply install everything. : )  It would take up quite a huge space though, about 14Gb. You can find out more about our AMS Designer simulator by clicking here.

    Best regards
    Quek

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