General-Purpose I/O User Guide: Agilex™ 5 FPGAs and SoCs

ID 813934
Date 10/07/2024
Public
Document Table of Contents

3.2.3. HVIO Buffer Behavior

Table 28.   HVIO Pins Guideline for Different Pin States
HVIO Pin State
Not turned on Powering up Fully powered up Configuration mode User mode Powering down

Either tristate the pins or do not drive them with any external voltage.

  • Pin voltage must not exceed VCCIO_HVIO . 9
  • After full VCCIO_HVIO power up, the pins are tri-stated.

All pins are tri-stated.

All pins are tri-stated.

Valid data transactions can be initiated.

  • Pin voltage must not exceed VCCIO_HVIO . 9
  • When the VCCIO_HVIO and VCC power rails are powering down, the I/O pin signals measure between ground and the VCCIO_HVIO voltage levels.
Note: After the Agilex™ 5 device fully powers up, the voltage levels for the HVIO pins must not exceed the DC input voltage (VI) value or the AC maximum allowed overshoot during transitions.
9 VCCIO_HVIO refers to the onboard real-time voltage supply.