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Message: [QUOTE="Andy, post: 1893511"] Using variables for the register itself also means that the register can be read back internally, which you can't do with the output port signal. Variable assignment/update overhead during simulation is less than that of signals. Using variables for the registers, then a final output signal assignment from the variable (within the process) removes the need for a separate combo process or concurrent assignment, and the simulation overhead involved with that too. Andy [/QUOTE]