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Summary
The prefix of LAST_EVENT, LAST_ACTIVE and LAST_VALUE attributes must be a signal.
Description
The VHDL Analyzer has encountered an attribute being used incorrectly. The specified attribute may only be applied to signal objects.
Recommendation
Check the type of the object being referenced in the attribute. If you are specifying these attributes within a subprogram, check to make sure the SIGNAL keyword has been specified on the associated subprogram parameter.