When connected to the DS90UB953-Q1 serializer, interrupts can be generated on changes in any of the four forward channel GPIOs per port. Interrupts are enabled by setting bits in the FC_GPIO_ICR register. Interrupts may be generated on rising and/or falling transitions on the GPIO signal. The GPIO interrupt status is cleared by reading the FC_GPIO_STS register.

Interrupts should only be used for GPIO signals operating at less than 10 MHz. High or low pulses that are less than 100 ns might not be detected at the DS90UB960-Q1. To avoid false interrupt indications, the interrupts should not be enabled until after the Forward Channel GPIOs are enabled at the serializer.