This appendix describes the I2E bus devices.
F.1 Power-On Reset Sequence
The Inter-IC Communication bus (I2C) is a simple 2-pin serial bus used to control some of the basic chassis management features. These include existing EEPROMs, fan controllers, and power supply monitors that are used to monitor the health and status of the chassis. In some instances, such as temperature, a separate interrupt immediately alerts the processors when it detects a problem.
F.2 I2E Bus Address Table
TABLE F-1 shows the addresses of the devices on the bus.
TABLE F-1 I2E Bus Addresses
|
Description
|
Part #
|
Location
|
Address (Hex)
|
|
Fan controller 0
|
VSC055-01
|
Disk backplane
|
0x1000000 (40/80)
|
|
Fan controller 1
|
VSC055-01
|
Disk backplane
|
0x1000001 (41/82)
|
|
System monitor
|
ADM1026
|
Front of I/O controller
|
0x0101100 (2C/58)
|
|
Processor inlet temp sensor
|
LM75
|
Rear of CPU board
|
0x1001001 (49/92)
|
|
PCI card area temp sensor
|
LM75
|
Between PCI slots on I/O controller
|
0x1001010 (4A/94)
|
|
IO controller ID PROM
|
AT24C64B
|
I/O controller
|
0x1010010 (52/A4)
|
|
Power supply 0 ID PROM
|
AT24C02A
|
Power Supply
|
0x1010100 (54/A8)
|
|
Power supply 1 ID PROM
|
AT24C02A
|
Power Supply
|
0x1010101 (55/AA)
|
|
Power supply 2 ID PROM
|
AT24C02A
|
Power Supply
|
0x1010110 (56/AC)
|
|
Backplane temperature sensor
|
LM75
|
Front of Disk backplane
|
0x1001000 (48/90)
|
|
Backplane ID PROM
|
AT24C64B
|
Disk backplane
|
0x1010000 (50/A0)
|
|
Proc card ID PROM
|
AT24C64B
|
CPU board
|
0x1010001 (51/A2)
|
|
Service processor ID PROM
|
AT24C64B
|
GRASP
|
0x1010011 (53/A6)
|
|
IO expander (for Front LEDs)
|
PCA9556
|
Disk backplane
|
0x0011000 (18/30)
|
|
IO Expander (for Fan Enables)
|
PCA9556
|
I/O controller
|
0x0011001 (19/32)
|
|
IO expander (for DIMM LEDs)
|
PCA9556
|
CPU board
|
0x0011100 (1C/38)
|
|
IO expander (for PROC LEDs)
|
PCA9556
|
CPU board
|
0x0011101 (1D/3A)
|
|
Proc card system monitor
|
ADM1026
|
Front of CPU board
|
0x0101101 (2D/5A)
|
|
Clock generator
|
CDC960
|
I/O controller
|
0x1101001 (69/D2)
|
|
8-port switch (for DIMMS and PCI slots)
|
PCA9548
|
I/O controller
|
0x1110000 (70/E0)
|
|
DIMM0 serial presence detect
|
EEPROM
|
DIMM
|
0x1010000 (50/A0)
|
|
DIMM1 Serial Presence Detect
|
EEPROM
|
DIMM
|
0x1010001 (51/A2)
|
|
DIMM2 serial presence detect
|
EEPROM
|
DIMM
|
0x1010010 (52/A4)
|
|
DIMM3serial presence detect
|
EEPROM
|
DIMM
|
0x1010011 (53/A6)
|
| Sun Fire X4500/X4540 Server Service Manual
|
819-4359-19
|
   
|
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