Intel® Pentium® Silver and Intel® Celeron® Processors Datasheet, Volume 1


ID 633935
Date 17/06/2021 00:00:00
Public Content

A newer version of this document is available. Customers should click here to go to the newest version.

Document Table of Contents

Configurable GPIO Voltage

Except for all pads in GPIO F, GPIO S, and GP_​DSW groups, all other GPIO pads support per-pad configurable voltage, which allows control selection of 1.8 V or 3.3 V for each pad. The configuration is done via soft straps.

Before soft straps are loaded, the default voltage of each pin depends on its default as input or output.

  • Input: 1.8 V level with 3.3 V tolerant.
  • Output: the pin drives 3.3 V via a ~20 K pull-up. With this, any 1.8 V device must be capable of taking 20K pull-up to 3.3 V.
Warning:GPIO pad voltage configuration must be set correctly depending on device connected to it; otherwise, damage to the PCH or the device may occur. Notes:
  • GPIO F and S groups support 1.8 V only.
  • GP_​DSW group supports 3.3 V only.