COMe-bSL6 – User Guide Rev. 1.4
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4.4.
Peripheral Component Interconnect (PCI) Devices
All devices follow the Peripheral Component Interconnect 2.3 (PCI 2.3) and PCI Express Base 1.0a specification. The
BIOS and Operating Software (OS) control the memory and I/O resources. For more information, refer to the PCI 2.3
specification.
4.5.
I2C Bus
The following table provides details of the devices connected the I2CBus and the I2C address
I2C Bus Port Addresses
I2C Address
Used For
Available
Comment
58h
No
Internally reserved
A0h
JIDA-EEPROM
No
Module EEPROM
AEh
FRU-EEPROM
No
Recommended for Baseboard EEPROM
4.6.
System Management (SM) Bus
The 8-bit SMBus address uses the LSB (Bit 0) for the direction of the device.
Bit0 = 0 defines the write address
Bit0 = 1 defines the read address
The 8-bit address listed below shows the write address for all devices. The7-bit SMBus address shows the device
address without bit0.
Designated I/O Port Addresses
8-bit
Address
7-bit
Address
Device
Comment
SMBus
5Ch
2Eh
HWM NCT7802Y
Do not use under any circumstances
SMB
A0h
50h
SPD DDR Channel 1 (SO-DIMM)
SMB
A4h
52h
SPD DDR Channel 2 (SO-DIMM)
SMB
30h
18h
SO-DIMM Thermal Sensor
If available on the used memory-module
SMB
34h
1Ah
SO-DIMM Thermal Sensor channel 2
If available on the used memory-module
SMB
