Other Data; Checksums; 128 Byte Pirom Checksum Values - Intel BX80569Q9550 - Core 2 Quad 2.83 GHz Processor Datasheet

System Management Bus Interface
Itanium ®
(for example, 2-core Intel
on the TAP chain.
6.4.10

Other Data

Addresses 7Dh-7Fh are listed as reserved.
6.4.11

Checksums

The Processor Information section of the ROM includes multiple checksums.
includes the checksum values for each section defined in the 128 byte PIROM section,
except the Other Data section.
Table 6-5.

128 Byte PIROM Checksum Values

Processor Uncore Data
Thermal Reference Data
Checksums are automatically calculated and programmed. The first step in calculating
the checksum is to add each byte from the field to the next subsequent byte. The
second step is to take the 2's complement of the first step. This value is the checksum.
Example: For a byte string of AA445Ch, the resulting checksum will be B6h.
AA = 10101010
First step: add the bytes.
AA + 44 + 5C = 01001010
Second step: take 2's complement.
10110101 +1 = 10110110
Checksum is 0xB6.
® ®
Intel Itanium Processor 9300 Series and 9500 Series Datasheet
Processor 9500 Series. Note that even reduced core count Itanium products
®
Itanium
Section
General
Processor Data
Processor Core Data
Cache Data
Package Data
Part Number Data
Feature Data
Other Data
44 = 01000100
®
Processor 9300 Series) will still have all devices
Checksum Address
0Eh
21h
2Dh
45h
4Eh
55h
6Ah
71h
7Ch
None Defined
5C = 0101100
§
Table 6-5
157