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e HVL (IEEE 1647): How to set 'X' value?

I would like to initialize some variables in my verification environment to 'X' value. How can I set 'X' value in e?

Thank you for your help

Solution

  • You can set values other than 0 and 1 using the MVL (multi-valued logic) functions. For a one-bit wide signal this would be:

    sig.put_mvl(MVL_X);

    It's also possible to assign multi-bit signals by writing:

    wide_sig.put_mvl_list({ MVL_X, MVL_X, ... });

    These methods only apply to ports. If you want to assign variables to X you need to declare them as being of type mvl or list of mvl.