full_case, parallel_case

Jayaram Bhasker (jbhasker@Cadence.COM)
Fri, 23 Apr 1999 17:28:37 -0400 (EDT)

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Another issue discussed at the 1364.1 WG meeting was on how to specify
full_case, parallel_case on a case statement.

In this regard, Cadence has made a proposal to the Verilog language committee
on how attributes can be specified for verilog constructs. This proposal
is attached. Note that this is an extension to the language. Here is an example:

case (foo) {* rtl_full_case, rtl_parallel_case *}
...
endcase

Attributes are specified on constructs using the {*...*} notation.

If the language committe can standardize on this attribute mechanism, then both
a simulation tol and a synthesis tool will be able to recognize and act on this
attribute appropriately.

Even if this proposal is agreed upon by the language committee,
the plan is not to incorporate this feature
in the current version of the RTL standard as all old models will no
longer be portable. But it can be incorporated in a future revision of the
synthesis standard.

We need your feedback in this regard whether such an attribute mechanism is
useful or not in a future revision of the synthesis standard.

- bhasker
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