errata/283: Syntax 2-1: 'dx, 'dz

From: Brad Pierce (Brad.Pierce@synopsys.com)
Date: Fri Feb 14 2003 - 16:05:14 PST

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    >Number: 283
    >Category: errata
    >Originator: "Brad Pierce" <Brad.Pierce@synopsys.com>
    >Environment:
    >Description:

    According to Syntax 2-1, a based decimal number can either be something
    like 12'd1_234_ or something like

           12'dx____
           12'dX____
           12'dz____
           12'dZ____
           12'd?____

    Section 2.5.1 about integer constants explains what x and z
    mean in binary, octal and hexidecimal constants, in which they
    can be used as digits.

    But the section is silent about the meaning of 'dx and 'dz and
    about the (sensible) restriction that x and z cannot be used
    as decimal digits.

    Is 12'dx the same as 12'bx? Is 12'sdx the same as 12'sbx?

    -- Brad

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