Agilex™ 5 FPGAs and SoCs Device Data Sheet

ID 813918
Date 8/05/2024
Public
Document Table of Contents

HPS GPIO Interface

The general-purpose I/O (GPIO) interface has debounce circuitry included to remove signal glitches. The debounce clock frequency ranges from 125 Hz to 32 kHz. The minimum pulse width is 1 debounce clock cycle and the minimum detectable GPIO pulse width is 62.5 µs (at 32 kHz).

If the external signal is driven into the GPIO for less than one clock cycle, the external signal is filtered. If the external signal is between one and two clock cycles, the external signal may or may not be filtered depending on the phase of the signal. If the external signal is more than two clock cycles, the external signal is not filtered.

The GPIO modules provided in the HPS include optional debounce capabilities. The external signal can be debounced to remove any spurious glitches that are less than one period of the external debouncing clock, gpio_db_clk.