C_INTR_LATCH
bus_space_write_2(iot, ioh, EP_COMMAND, C_INTR_LATCH);
bus_space_write_2(iot, ioh, EP_COMMAND, C_INTR_LATCH);
bus_space_write_2(iot, ioh, EP_COMMAND, C_INTR_LATCH);
C_INTR_LATCH | C_INT_RQD);