Intel III Xeon 550 MHz 80525KY550512 User Manual

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Also available on the SMBus is an EEPROM which may be used for other data at the system or 
processor vendor’s discretion. The data in this EEPROM, once programmed, can be write-
protected by asserting the active-high WP signal. This signal has a weak pull-down (10 k

Ω

) to 

allow the EEPROM to be programmed in systems with no implementation of this signal. The 
Scratch EEPROM is a 1024 bit part.

8

L2 Cache Voltage Tolerance, 
High

Edge finger tolerance in mV, +

8

L2 Cache Voltage Tolerance, Low

Edge finger tolerance in mV, -

4

Cache/Tag Stepping ID

One 4-bit hex digit

4

Reserved

Reserved for future use

8

Checksu

1 byte checksu

CARTRIDGE: 32h

32

Cartridge Revision

Four 8-bit ASCII characters

2

Substrate Rev. Software ID

2-bit revision number

6

Reserved

Reserved for future use

8

Checksu

1 byte checksu

PART NUMBERS: 
38h

56

Processor Part Number

Seven 8-bit ASCII characters

112

Processor BOM ID

Fourteen 8-bit ASCII characters

64

Processor Electronic Signature

64-bit processor number

208

Reserved

Reserved for future use

8

Checksu

1 byte checksu

THERMAL REF.: 
70h

8

Thermal Reference Byte

See below

16

Reserved

Reserved for future use

8

Checksu

1 byte checksu

FEATURES: 74h

32

Processor Core Feature Flags

From CPUID

32

Cartridge Feature Flags

[6] = Serial Signature
[5] = Electronic Signature Present 
[4] = Thermal Sense Device Present 
[3] = Thermal Reference Byte Present
[2] = OEM EEPROM Present
[1] = Core VID Present
[0] = L2 Cache VID Present

4

Number of Devices in TAP Chain

One 4-bit hex digit

4

Reserved

Reserved for future use

8

Checksu

1 byte checksu

OTHER: 7Eh

16

Reserved

Reserved for future use