Enhanced Serial Peripheral Interface 1.0 ( eSPI )_327432-004

Enhanced Serial Peripheral Interface 1.0 ( eSPI )_327432-004

Version: 1.0 (Latest) Date: 1/25/2016

Available Downloads

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1.21 MB


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1.24 MB


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0.34 MB


OS Independent


0.19 MB

eSPI ECN - Change Alert pin behavior.pdf

OS Independent


0.08 MB

eSPI ECN - Clarify OOB packet payload.pdf

Detailed Description

This specification describes the architecture details of the Enhanced Serial Peripheral Interface (eSPI) bus interface.

The devices that can be supported over this interface includes but are not necessary limited to Embedded Controller (EC), Baseboard Management Controller (BMC), Super-I/O (SIO), and Port-80 debug card.


Prior to this specification, Embedded Controller (EC), Baseboard Management Controller (BMC), and Super I/O (SIO) are connected to the chipset through the Low Pin Count (LPC) bus. Low Pin Count (LPC) bus is a legacy bus developed as the replacement for Industry Standard Architecture (ISA) bus.


The specification generally refers to EC/BMC/SIO as the LPC device for the purpose of illustrating the eSPI bus capabilities and the comparison to LPC bus. However, EC/SIO is applicable for client platforms whereas BMC is generally associated with server platforms.


Files provided:

329957-001_eSPI_Spec_Server_Addendum_Rev0_7_Chg_Bars.pdf: Provides additional information specific to eSPI implementation in servers.

327432-004_eSPI_Base_Specification_rev1.0.pdf: Revision 1.0 eSPI specification document.
327432-004_eSPI_Base_Specification_rev1.0_CB.pdf: Same document as eSPI Specification rev 1.0. pdf but includes a section that describes the changes made from revision 7 ("CB" = Change Bar)

Engineering Change Notice - Enhanced Serial Peripheral Interface (eSPI) ECN - Change Alert# pin behavior
Title - Change Alert# pin behavior
Date - 10 January 2014
Affected Document - eSPI Base Specification Rev. 1.0

Engineering Change Notice - Enhanced Serial Peripheral Interface (eSPI) ECN - Clarify OOB packet payload
Title - Clarify OOB packet Payload
Date - 10 January 2014
Affected Document - eSPI Base Specification Rev. 1.0

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