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Summary
Signal 'name' is not readable as it has mode OUT.
Description
The Compiler has encountered an invalid use of a port with mode out. It is not legal to read values of ports, or aliases of ports, that have been declared as mode out.
Recommendation
Check to make sure that you are specifying the correct port in your design. If you need to read the value of a port, use mode buffer. You could also consider mode inout. This, however, specifies bi-directional data flow and is often over-specification.