User guide

30
M5000 Series: User Guide
Issued June 20, 2007
Processor Subsystem
The 440GX PowerPC processor has access to the four temperature sensors on its secondary I2C
bus. The following figure describes the processor I2C configuration:
FIGURE 3-3
AMCC 440GX
I2C Devices
Serial PROM Devices
There are three Serial Prom devices:
• One serial PROM is required for the processor to boot and load the configuration parameters.
• One SPROM is used to keep the processor from booting.
• A third serial EEPROM is used to store the MFS (Midas File System). Monitor and BSP boot
behavior depending on parameter values held in the MFS.
Use of SPROM Devices should be under VMETRO guidance, some functions are already available
in the BSP software.
IBM
440GX
I
2
C 0
I
2
C 1
I/O
Spacer
???
I/O
Spacer
???
MFS
1010001b
MFS
1010001b
Flash Boot
Params
101010Xb
Flash Boot
Params
101010Xb
PCI Boot
Params
101010Xb
PCI Boot
Params
101010Xb
Temp
Sensor 3
1001010b
Temp
Sensor 3
1001010b
Temp
Sensor 2
1001011b
Temp
Sensor 2
1001011b
Temp
Sensor 1
1001111b
Temp
Sensor 1
1001111b
X is set up using PPC_BOOT dip-switch
Temp
Sensor 4
1001001b
Temp
Sensor 4
1001001b
I2C
Switch
I2C
Switch
1010001b
SFF
SPROM
1010001b
SFF
SPROM