Stratix® 10 Hard Processor System Technical Reference Manual

ID 683222
Date 8/15/2024
Public
Document Table of Contents

14.3.3.2. Stratix® 10 Dedicated Configuration Registers

Configuration registers for each dedicated I/O pin allow software to control the corresponding I/O cell. These registers, io0ctrl through io47ctrl, allow software to set the following characteristics:

  • Drive strength discrete values set to 8, 10, or 12 mA
  • Slow/Fast Slew rate control
  • Internal weak pullup
  • internal weak pulldown
  • Open drain
  • Schmitt trigger/TTL input

A warm reset event does not affect these registers.

In addition, registers io0_delay through io47_delay allow software to set the delay chains in each of the dedicated I/Os.

Note: Although the dedicated I/O pins are configured through the control registers, Intel recommends against reconfiguring the dedicated I/O pins after I/O configuration is complete.