Istype 'dc'
Unspecified Logic is Don't Care

Syntax

signal_name [,signal_name] [PIN|NODE] ISTYPE 'com' ;

Use

Signal attribute 'dc' is used to specify that unspecified logic should be given a value of don't care.

The 'dc' attribute is equivalent to the @DCSET directive, except that it operates on individual signals instead of on an entire section of a design.

Note: 'dc,' 'neg,' and 'pos' are mutually exclusive.

Caution: The @DCSET directive overrides 'dc,' 'neg,' and 'pos'.