Sun Microsystems Netra CP3060, Руководство пользователя

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Chapter 5 Hardware and Functional Descriptions 5-23
A few items are worth noting in the I
2
C address map shown above. The Address
column indicates the I
2
C address for the associated device. Although the I
2
C address
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
TABLE 5-3
.
Note that a number of addresses are the same. This is possible because they are on
different I
2
C segments controlled by the I
2
C MUX.
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.
0xA8 MB No DDRR_I2C Channel 3 DIMM0
0xAC MB No DDRR_I2C Channel 3 DIMM1
0x72 AMC No (Yes,
AMC
management
power) IMPI_L H8 IPMI bus to AMC module
TABLE 5-3
I
2
C Address Map (Continued)
Address Location
Standby
Powered
I
2
C Segment Accessed by: Function