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Case x, z difference, which is preferable, why?
CASEZ :
Special version of case statement that uses a Z logic value to signify don't-care bits.
CASEX :
Special version of case statement that uses Z or X logic values to represent don't-care bits.
CASEZ must be used for case statements with wildcard don't cares, or else use of CASE is required; CASEX must never be used.
This is because:
Don't cares aren't allowed in the "case" statement. Hence casex or casez are required. Casex would automatically match any x or z with anything in the case statement. Casez would only match z's --x's require an absolute match.
Case
case Complete bitwise match between expression and case item expression casez enables for z values to be treated as don't cares.
casex allows for both x and z to be treated as don't cares.
example of data dictionary
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