Here is an UPDATED proposal, to add to section 5, on how x and z values are to be
interpreted for synthesis.
--------------------------
5.5 Support for meta-logical values, x and z
The value x may be used only as a primary on the RHS of an assignment
to indicate
a dont care value for synthesis.
The value x may be used in case item expressions in a casex statement to
imply a dont care value for synthesis.
The value x may be used in a case item expression in a case statement; however
such a branch is never expected to occur for synthesis.
The value x shall not be used with any
operators or mixed with other expressions.
The value z may be used only as a primary on the RHS of an assignment to
infer a three-state driver as described in section 5.4.
The value z (or ?) may be used in case item expressions for casex and casez
statements to imply a dont care value for synthesis.
The value z may be used in a case item expression of a case statement; however
such a branch is never expected to occur for synthesis.
The value z shall not be used with any operators or mixed with other expresions.
-------------------------
Please provide your comments on this UPDATED proposal by March 15.
- bhasker
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Date: Mon, 8 Mar 1999 16:12:11 -0500 (EST)
From: Jayaram Bhasker <jbhasker>
To: vlog-synth@eda.org
Subject: Support for values x and z
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Here is a proposal, to add to section 5, on how x and z values are to be
interpreted for synthesis.
--------------------------
5.5 Support for non-logical values, x and z
The value x may be used only as a primary on the RHS of an assignment
to indicate
a dont care value for synthesis.
The value x shall not be used with any
operators or mixed with other expressions.
The value z may be used only as a primary on the RHS of an assignment to
infer a three-state driver as described in section 5.4.
The value z shall not be used with any operators or mixed with other expresions.
-------------------------
Please provide your comments on this proposal by March 15.
- bhasker
----- End Included Message -----