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Document Number: 318080-002 137
Features
7.4.4 Checksums
The PIROM includes multiple checksums. Table 7-7 includes the checksum values for
each section defined in the 128 byte ROM.
Checksums are automatically calculated and programmed by Intel. The first step in
calculating the checksum is to add each byte from the field to the next subsequent
byte. This result is then negated to provide the checksum.
Example: For a byte string of AA445Ch, the resulting checksum will be B6h.
AA = 10101010 44 = 01000100 5C = 0101100
AA + 44 + 5C = 01001010
Negate the sum: 10110101 +1 = 101101 (B6h)
7.4.5 Scratch EEPROM
Also available in the memory component on the processor 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
SM_WP signal. This signal has a weak pull-down (10 kΩ) to allow the EEPROM to be
programmed in systems with no implementation of this signal. The Scratch EEPROM
resides in the upper half of the memory component (addresses 80 - FFh). The lower
half comprises the Processor Information ROM (addresses 00 - 7Fh), which is
permanently write-protected by Intel.
§
Offset: 7Fh
Bit Description
7:0 Feature Data Checksum
One Byte Checksum of the Feature Data Section
00h- FFh: See Section 7.4.4 for calculation of the value
Table 7-7. 128 Byte ROM Checksum Values
Section Checksum Address
Header 0Dh
Processor Data 15h
Processor Core Data 24h
Cache Data 31h
Package Data 37h
Part Number Data 6Fh
Thermal Ref. Data 73h
Feature Data 7Fh
- Processor 7200 Series 1
- Contents 3
- 4 Document Number: 318080-002 4
- Document Number: 318080-002 5 5
- 6 Document Number: 318080-002 6
- Document Number: 318080-002 7 7
- Revision History 8
- 1 Introduction 9
- 1.1 Terminology 11
- Introduction 12
- 1.2 State of Data 13
- 1.3 References 13
- 2 Electrical Specifications 15
- Clocking 16
- 2.3.2 PLL Power Supply 17
- Electrical Specifications 18
- Table 2-4. FSB Signal Groups 21
- Asynchronous Signals 22
- 2.9 Mixing Processors 23
- CC_VTT_OUT 27
- Time Duration (s) 28
- Sustained Current (A) 28
- Table 2-10. V 30
- Load Lines 32
- Static and Transient 34
- Tolerance Load Lines 34
- Specifications 35
- 2.11.2.1 DC Characteristics 36
- 2.11.3 V 37
- Overshoot Specification 37
- Example Overshoot Waveform 38
- Tp = T1: BCLK[1:0] period 47
- THERMTRIP# 51
- Figure 2-26. VID Step Timings 54
- 3 Mechanical Specifications 57
- Mechanical Specifications 58
- 3.7 Processor Materials 67
- 3.8 Processor Markings 68
- Processor 69
- 4 Pin Listing 71
- 10 of 16) 75
- 11 of 16) 76
- 12 of 16) 76
- 13 of 16) 77
- 14 of 16) 77
- 15 of 16) 78
- 16 of 16) 78
- 1 of 14) 79
- 2 of 14) 79
- 3 of 14) 80
- 4 of 14) 80
- 5 of 14) 81
- 6 of 14) 81
- 8 of 14) 82
- 7 of 14) 82
- 9 of 14) 83
- 10 of 14) 83
- 11 of 14) 84
- 12 of 14) 84
- 13 of 14) 85
- 14 of 14) 85
- Pin Listing 86
- 5 Signal Definitions 87
- CC and BCLK have reached 92
- 6 Thermal Specifications 95
- CASE_MAX 96
- Thermal Profile 98
- = 0.162 x Power + 45 98
- Pow er (W) 100
- Temperature (C) 100
- = 0.420 x Power + 45 100
- = 0.238 x Power + 45 101
- 6.1.2 Thermal Metrology 102
- 6.2.2 Thermal Monitor 103
- 6.2.3 Thermal Monitor 2 104
- 6.2.4 On-Demand Mode 105
- 6.2.5 PROCHOT# Signal 106
- 6.2.6 FORCEPR# Signal 106
- 6.2.7 THERMTRIP# Signal 106
- 6.3.1 Introduction 107
- 6.3.2 PECI Specifications 108
- 7 Features 111
- 7.2.1 Normal State 112
- EXTENDED_HALT 113
- 7.2.3 Stop-Grant State 114
- 7.3 Enhanced Intel SpeedStep 115
- Technology 115
- Features 116
- 7.4.1 SMBus Device Addressing 117
- Transactions 118
- 7.4.3.1 Header 121
- 7.4.3.2 Processor Data 125
- 7.4.3.3 Processor Core Data 126
- 16h-19h 127
- 1Ah-1Bh 127
- Offset: 1Ch 128
- 1Dh-1Eh 128
- 1Fh-20h 128
- 7.4.3.4 Cache Data 129
- 7.4.3.5 Package Data 131
- 7.4.3.6 Part Number Data 132
- 38h-3Eh 133
- 3Fh-4Ch 133
- 4Dh=54h 133
- 55h-6Eh 134
- 71h-72h 134
- 7.4.3.8 Feature Data 135
- 7.4.3.9 Other Data 136
- 7.4.4 Checksums 137
- 7.4.5 Scratch EEPROM 137
- 8.1 Introduction 139
- 8.2 Thermal Specifications 139
- 9 Debug Tools Specifications 141
- Debug Tools Specifications 142
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