Quartus

Detected combinatorial loop in register <name> at time <time> -- set output to X


CAUSE: The Simulator detected a combinatorial loop (that is, a zero-time oscillation) in the specified register at the specified time that prevents the register value from reaching a stable state. When this condition occurs, simulation is not performed for the register and the output value is set to X.
ACTION: To avoid receiving this message, modify the design or the vector source file such that it does not contain a combinatorial loop.

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