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2
I
C Address Map (Continued)
TABLE 5-3
Standby
Address
Location
Powered
0xA8
MB
No
0xAC
MB
No
0x72
AMC
No (Yes,
AMC
management
power)
A few items are worth noting in the I
column indicates the I
space is only 7 bits, the read/write bit is appended as bit <0>. Thus, the addresses
listed here all represent the read form of the given device's address, that is,
Addr<0>=0. These devices are solely accessed by the H8 on the motherboard (MB),
if not otherwise noted in
Note that a number of addresses are the same. This is possible because they are on
different I
The Location column indicates the FRU on which the physical device resides. The
Standby column indicates whether this device is readable when the system is in
standby mode; that is, powered off but receiving its main power source. In other
words, a YES in this column indicates that the H8 which is powered from the
systems standby power rail, can access this device at all times, whether the system is
powered on or off.
5.1.6.10
System Monitor and Thresholds
The system monitor (ADM1026) is a highly integrated and highly sophisticated
multi-function system monitor, including Analog-to-Digital Conversion (ADC),
Digital-to-Analog Conversion (DAC), Temperature Sensing, and GPIO pins.
The Analog Devices ADM1026 is used for system monitoring functions. The
ADM1026 is interfaced with the IPMC, and the IPMC firmware is responsible for
monitoring these sensors.
Voltage Monitoring
The ADM1026 measures most of the board voltages. The ADM1026 has one
temperature sensor embedded in the device itself and supports two remote sensing
channels requiring external diodes for temperature sensing. These remote sensors
are used for measuring CPU die temperature.
2
I
C Segment
Accessed by:
DDRR_I2C
DDRR_I2C
H8
IMPI_L
2
C address for the associated device. Although the I
TABLE 5-3
2
C segments controlled by the I
2
C address map shown above. The Address
.
2
C MUX.
Chapter 5
Hardware and Functional Descriptions
Function
Channel 3 DIMM0
Channel 3 DIMM1
IPMI bus to AMC module
2
C address
5-23
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