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Summary
Illegal NULL in concurrent signal assignment.
Description
The Compiler has encountered an illegal assignment to NULL in a concurrent signal assignment. VHDL does not allow assignments of NULL in concurrent signal assignments.
Recommendation
Check to make sure that you really need to assign the signal to NULL. If you are attempting to describe an output enable, you should use the std_logic data type and assign the signal a value of 'Z', rather than NULL. If you require an assignment of NULL, modify the design so that the assignment is performed within a process or subprogram.