External pause originates from the external pause line. An active low on this line low will cause an immediate pause. The external pause overrides other pause conditions set to the GT-DIO board.
The P mask and event registers can be used to create conditional pauses that depend on external event lines. The 16 external event lines are ANDed with pre-defined masks and compared with pre-defined events in register P.
The external/internal events pause function in the board is shown in the figure below:
External Events Pause Block Diagram