Intel Video Game Controller Intel Gigabit Ethernet Controllers User Manual

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Note: Since the 82546GB/EB is a dual-port device, the Management Control in 13h corresponds to LAN 

B, and the Management Control in 23h corresponds to LAN A.

The following table lists the SMBus slave address for TCO mode.

Note: This byte must be C8h for ASF mode. For example, to program an address of 0011_001b, the byte 

should be set to 0011_0010b. When this address is used on the SMBus, the address byte is 

0011_0010b for writes and 0011_0011b for reads.

Note: Since the 82546GB/EB is a dual-port device, the SMBus Slave Address in 14h corresponds to 

LAN B, and the SMBus Slave Address in 24h corresponds to LAN A.

2

Reset on Force TCO

This bit is controlled by the ASF agent. Manually set this bit for 
TCO mode.
Reset the Ethernet controller on a ForceTCO SMBus Command 
with the “Force” bit set to 1b (default) in TCO mode, or on various 
conditions in ASF mode.
Set this bit to 0b if the SMBus is disabled.

1

ASF Mode

This bit is controlled by the ASF agent.
Set this bit to 1b to enable ASF mode.
Set this bit to 0b (default) for TCO mode and Intel’s ASF Agent 
implementation.

0

SMBus  Enable

This bit is controlled by the ASF agent. Manually set this bit for 
TCO mode.
Set this bit to 1b (default) to enable SMBus functionality.
Set this bit to 0b to enable ASF mode if its being routed by LAN A 
and if LAN A is the active interface for ASF to the BIOS.

1.

Applicable to the 82546GB/EB only.

7:1

SMBus Slave Address

These bits are controlled by the ASF agent. Manually set these bits for 
TCO mode.
Contains the SMBus slave address for TCO mode. This address must 
be 1100b 100b for ASF mode. 

0

Reserved

Set this bit to 0b.