| CAUSE: | In a Boolean expression in a Text Design File (.tdf), you used both a comparator and a constant with the specified don't care (X) value. However, you cannot use don't care values in a Boolean expression that contains a comparator. The Compiler ignored the don't care value as it performed the comparison, and may therefore have produced incorrect comparison results. |
| ACTION: | To avoid receiving incorrect comparison results, use only fully defined values (that is, values without don't care bits) in the comparison. |
See also:
Implementing Boolean Expressions & Equations
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