Intel® 800 Series Chipset Family Platform Controller Hub (PCH)

Datasheet, Volume 1 of 2

ID Date Version Classification
833778 02/06/2025 Public
Document Table of Contents

Signal Description

Signal Name

Type

Description

GPP_​A00/ESPI_​IO0

I/O

eSPI Data Signal 0: Bi-directional pin used to transfer data between the PCH and eSPI device.

GPP_​A01/ESPI_​IO1

I/O

eSPI Data Signal 1: Bi-directional pin used to transfer data between the PCH and eSPI device

GPP_​A02/ESPI_​IO2/PRIMWARN#/PRIMPWRDNACK

I/O

eSPI Data Signal 2: Bi-directional pin used to transfer data between the PCH and eSPI device

GPP_​A03/ESPI_​IO3/PRIMACK#

I/O

eSPI Data Signal 3: Bi-directional pin used to transfer data between the PCH and eSPI device

GPP_​A04/ESPI_​CS0#

O

eSPI Chip Select 0: Driving CS# signal low to select eSPI device for the transaction.

GPP_​A05/ESPI_​CLK

O

eSPI Clock: eSPI clock output from the PCH to device.

GPP_​A06/ESPI_​RESET#

O

eSPI Reset: Reset signal from the PCH to eSPI device.

GPP_​A07/ESPI_​CS1#

O

eSPI Chip Select 1 :Driving CS# signal low to select eSPI device for the transaction.

GPP_​A08/ESPI_​CS2#

O

eSPI Chip Select 2:Driving CS# signal low to select eSPI device for the transaction.

GPP_​A09/ESPI_​CS3#

O

eSPI Chip Select 3:Driving CS# signal low to select eSPI device for the transaction.

GPP_​A10/ESPI_​ALERT0#

I

eSPI Alert 0 :Alert signal from eSPI device to the PCH.

Note:If only a single device is connected, the eSPI Compatibility Specification requires that the device must operate with in-band Alert# signaling in order to free up the GPIO pin required for the discrete Alert# pin.

GPP_​A11/ESPI_​ALERT1#

I

eSPI Alert 1 : Alert signal from eSPI device to the PCH.

Note:If only a single device is connected, the eSPI Compatibility Spec requires that the device must operate with in-band Alert# signaling in order to free up the GPIO pin required for the discrete Alert# pin.

GPP_​A12/ESPI_​ALERT2#

I

eSPI Alert 2: Alert signal from eSPI device to the PCH.

Note:If only a single device is connected, the eSPI Compatibility Spec requires that the device must operate with in-band Alert# signaling in order to free up the GPIO pin required for the discrete Alert# pin.

GPP_​A13/ESPI_​ALERT3#

I

eSPI Alert 3: Alert signal from eSPI device to the PCH.

Note:If only a single device is connected, the eSPI Compatibility Spec requires that the device must operate with in-band Alert# signaling in order to free up the GPIO pin required for the discrete Alert# pin.