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Message: [QUOTE="Andy, post: 5109638"] If your tools support vhdl-2008, it really helps. Modelsim's tools do support 2008, but 2008 has new reserved words that, if used in your pre-2008 written code, also cause a failure. If for some reason you cannot use 2008, then you still have a couple of good options. Initialize the constant with "00100" (not as readable) Convert the case expression to an integer, and store it in a variable, then used that variable in the case statement. Then define your target expression constants as integers. There are probably others... Note that 2008 would also allow you to skip the variable for the converted case expression. Andy [/QUOTE]