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Intel NetStructure
®
MPCMM0002 Chassis Management Module
July 2007 Hardware TPS
Order Number: 309247-004US 69
Guidelines for Third Party Chassis Vendors—MPCMM0002 CMM
13.6.2 Two-Wire Serial Interface Based
FRUs such as sensors, EEPROMs, or similar devices that have support for the two-wire
serial bus (I
2
C) can be hooked on shared or dedicated I
2
C buses. Examples are the
Atmel* AT24C64/16 EEPROMs and the DS75 temperature sensor.
13.7 Non-Intelligent FRUs without I
2
C Support
The GPIO pins and (if needed) the dedicated I/O pins of the CMM can be used to allow
FRUs that do not support the I
2
C bus to communicate with the CMM. For example, the
air filter tray used on the Intel NetStructure MPCHC0001 chassis communicates with
the CMM in this manner. In that chassis some of the seven GPIOs shown in Figure 33
are used to control the LED and to detect the presence of the filter tray. Also, readings
from two temperature sensors (thermistors) on the filter tray are wired to the
ADM1026 on the CMM board.
13.8 FRU Data Storage for Non-Intelligent Devices
Version 6.1 of the CMM firmware for the MPCMM0002 currently supports the Atmel
Corporation* AT24C64 or AT24C16 EEPROMs and the Microchip Technology* 24LC256
EEPROM for the storage of FRU data on any non-intelligent device in the chassis. In
particular, the chassis FRU data must be stored on one of these EEPROMs, each of
which can store up to 8 kilobytes of data.
Figure 36. FRU That Uses the ADM1026
PWM
ADM 1026
AIN(3) AIN(4) AIN(5)
FANTK0/GPIO0
User LED2
User LED1
Health LED
GPIO10
GPIO9
HS LED
Monitor fan voltage for all 3
fans
HS Button
FANTK1/GPIO1
FANTK2/GPIO2
Fan1 Tach
Fan2 Tach
Fan3 Tach
SDA
I2c Data
SCL
I2c Clock
GPIO13
GPIO12
GPIO11
IPMB-A[1] SDA
IPMB-A[1] SDA
CMM
Fan Tray Presence
signal
GPIO 1
FPGA2
FPGA1