Quartus

Device requires opposite polarity of global signal for this port -- invert INPUT pin <pin name> that feeds the secondary input of primitive <primitive name>

CAUSE: The specified INPUT pin feeds a GLOBAL buffer that in turn feeds the secondary input of another primitive. However, the polarity of the signal feeding the GLOBAL buffer is incorrect. For this device, the secondary input does not allow the specified global signal to have this polarity.
ACTION: Invert the specified signal by inserting a NOT gate between the INPUT primitive and the GLOBAL primitive.

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