2 processor information rom, Processor information rom, Eeprom smbus addressing on the itanium – Intel Itanium 2 Processor User Manual
Page 82: Processor information rom format, Table 6-3
82
Datasheet
System Management Feature Specifications
6.2
Processor Information ROM
An electrically programmed read-only memory (ROM) provides information about the Itanium 2
processor. The checksum bits for each category provide error correction and serve as a mechanism
to check whether data is corrupted or not. This information is permanently write-protected.
shows the data fields and formats provided in the memory.
Note:
The data, in byte format, is written and read serially with the most significant bit first.
Table 6-3. EEPROM SMBus Addressing on the Itanium
®
2 Processor
Address
(Hex)
Upper
Address
1
NOTES:
1. Though this addressing scheme is targeted for up to four-way MP systems, more processors can be supported by using a
multiplexed (or separate) SMBus implementation.
Processor Select
Memory
Device
Select
Read/
Write
Device Addressed
Bits 7–4
(SMA1)
Bit 3
(SMA0)
Bit 2
Bit 1
Bit 0
A0h/A1h
1010
0
0
0
X
Scratch EEPROM 1
A2h/A3h
1010
0
0
1
X
Processor Information ROM 1
A4h/A5h
1010
0
1
0
X
Scratch EEPROM 2
A6h/A7h
1010
0
1
1
X
Processor Information ROM 2
A8h/A9h
1010
1
0
0
X
Scratch EEPROM 3
AAh/ABh
1010
1
0
1
X
Processor Information ROM 3
ACh/ADh
1010
1
1
0
X
Scratch EEPROM 4
AEh/AFh
1010
1
1
1
X
Processor Information ROM 4
Table 6-4. Processor Information ROM Format (Sheet 1 of 4)
Offset/
Section
# of
Bits
Function
Notes
Examples
Header
00h
8
Data Format Revision
Two 4-bit hex digits
Start with 00h
01h
16
EEPROM Size
Size in bytes (MSB first)
Use a decimal to hex
transfer; 128 bytes =
0080h:
•
02h[7:4] = 0000
•
02h[3:0] = 0000
•
01h[7:4] = 1000
•
01h[3:0] = 0000
03h
8
Processor Data Address
Byte pointer, 00h if not present
0Eh
04h
8
Processor Core Address
Byte pointer, 00h if not present
17h
05h
8
Processor Cache Address
Byte pointer, 00h if not present
28h
06h
8
Processor Data Address
Byte pointer, 00h if not present
37h
07h
8
Part Number Data Address
Byte pointer, 00h if not present
3Eh
08h
8
Thermal Reference Data
Address
Byte pointer, 00h if not present
63h