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If a PGAssign is driven by a select then make a driver. 

When a PGAssign is driven by (r-value) a bit, part or indexed
select and the strength is not the default (supply). Then
we need to create a driver (BUFZ) to convey the strength
information.
This commit is contained in:
Cary R 2009-04-02 17:20:41 -07:00 committed by Stephen Williams
parent 74ea0ecb4a
commit 85e2bf3e55
1 changed files with 8 additions and 0 deletions
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8
elaborate.cc
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@ -189,6 +189,14 @@ void PGAssign::elaborate(Design*des, NetScope*scope) const
need_driver_flag = false; need_driver_flag = false;
} }
/* When we are given a non-default strength value and if the
* drive source is a bit, part or indexed select we need to
* add a driver (BUFZ) to convey the strength information. */
if ((drive0 != Link::STRONG || drive1 != Link::STRONG) &&
(dynamic_cast<NetESelect*>(rval_expr))) {
need_driver_flag = true;
}
if (need_driver_flag) { if (need_driver_flag) {
NetBUFZ*driver = new NetBUFZ(scope, scope->local_symbol(), NetBUFZ*driver = new NetBUFZ(scope, scope->local_symbol(),
rval->vector_width()); rval->vector_width());