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Disabling single signals in expression coverage?

cmautner

I am running expression coverage on a design. There are many ATPG multiplexers implemented in RTL, such as

wire signal = aptg_mode ? something : something_else;

Expression coverage complains that, since atpg_mode is always 0 in RTL simulations, the ternary expression is only 50% tested. Is there something I can do about it? Like, a pragma that tells the coverage scoring that atpg_mode is considered to be constant '0'?

Parents

  • My apologies for never responding to this.

    So this is what I ended up doing:

    `ifdef COVERAGE_SIMULATION
      assign atpg_mode = 0;
    `else
      assign aptg_mode = atpg_mode_reg;
    `endif

    This was pretty much the only way that ended up working for me.

    Thanks for your help, Stephen!

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  • My apologies for never responding to this.

    So this is what I ended up doing:

    `ifdef COVERAGE_SIMULATION
      assign atpg_mode = 0;
    `else
      assign aptg_mode = atpg_mode_reg;
    `endif

    This was pretty much the only way that ended up working for me.

    Thanks for your help, Stephen!

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