Intel® Pentium® Silver and Intel® Celeron® Processors

Datasheet, Volume 1 of 2

ID Date Version Classification
633935 12/27/2022 Public
Document Table of Contents
DSP

TCO Modes

TCO Compatible Mode

In TCO Legacy/Compatible mode, only the host SMBus is used. The TCO Slave is connected to the host SMBus internally by default.

TCO Compatible Mode SMBus Configuration

In TCO Legacy/Compatible mode the PCH can function directly with an external LAN controller or equivalent external LAN controller to report messages to a network management console without the aid of the system processor. This is crucial in cases where the processor is malfunctioning or cannot function due to being in a low-power state. Below table includes a list of events that will report messages to the network management console.

Event Transitions that Cause Messages

Event

Assertion?

Deassertion?

Comments

Watchdog Timer Expired

Yes

NA

“Hung S0” state entered

SMBALERT# pin

Yes

Yes

Must be in “Hung S0” state

BATLOW#

Yes

Yes

Must be in “Hung S0” state

CPU_​PWR_​FLR

Yes

No

“Hung S0” state entered

Advanced TCO Mode

The PCH supports the Advanced TCO mode in which SMLink are used in addition to the host SMBus.

In advanced TCO mode, the TCO slave can either be connected to the host SMBus or the SMLink0.

Advanced TCO Mode