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Summary
A description cannot be the target of a Variable assignment statement.
Description
The Compiler has encountered an invalid use of a variable assignment (:=). The target of a variable assignment must be a variable.
Recommendation
Check to make sure that the left side of the assignment is a variable. If you are assigning to a signal or port, use the signal assignment operator <= .
Note, however, that variable assignments occur immediately within the process and signal assignments are executed at the end of a process. Such a substitution may change the behavior of your design.