GE VR11, Reference Manual

Page: 71 / 118

The Technical Product Information CD-ROM supplied with the VR11 includes
the most commonly used software drivers and utilities.
Additional devices
SMBus devices
The VR11 uses a serial 2-wire I
2
C bus to communicate with several onboard
devices:
Table 23: Additional devices
Device Designation SMBus address a
Clock synthesizer * U1000 1101 001Xb
Clock buffer * U1110 1101 110Xb
SPD Eeprom U1981 1010 1XXXb
Factory Eeprom U1981 1010 00XXb
User Eeprom 24C512 U1983 1010 010Xb
Temperature Sensor LM86 U1985 0101 011Xb
Optional Temperature sensor
LM83 U1982 0011 001Xb
Northbridge E7520 U1300 0011 000Xb
Southbridge 6300ESB (slave) U1600 1000 100Xb
PCIe bridge 6700PXH U6000 1100 000Xb
Devices marked * are handled by BIOS. It is strongly recommended not to
access these devices via the user software.
An X at bit 0 represents the R/#W bit.
Temperature Sensor LM86
A LM86 temperature sensor is implemented on the VR11 board. The sensor is
located close to the CPU and shows the die-temperature of the CPU and the
local onboard temperature. The sensor has an over-temperature output
integrated and this can be used to take actions like reducing the CPU speed. For
programming information please see the 'Board Specific Hardware
Programmer’s Manual´.
More information on LM86 can be found in the data sheet from National
Semiconductors.
Serial EEPROM
For storage of user data a serial EEPROM is implemented on the VR11 board.
The user EEPROM is a 24C512 type with 64 kBytes of memory. More
information about writing and reading the contents can be found in the data
sheets from the manufacturer (e.g. Microchip Technology, SGS Thomson,
Atmel, Catalyst and many others).
GE Intelligent Platforms – VR11, VP11 Hardware Reference Manual, Second Edition Page 71