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AMD 8 SYSCLK and SYSCLK# DC Characteristics, Preliminary Information, Chapter, Electrical Data

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8.9SYSCLK and SYSCLK# DC Characteristics

Preliminary Information

25175H —March 2003

AMD Athlon™ XP Processor Model 8 Data Sheet

8.9SYSCLK and SYSCLK# DC Characteristics

Table 14 shows the DC characteristics of the SYSCLK and SYSCLK# differential clocks. The SYSCLK signal represents CLKIN and RSTCLK tied together while the SYSCLK# signal represents CLKIN# and RSTCLK# tied together. For information about SYSCLK and SYSCLK#, see “SYSCLK and SYSCLK#” on page 79 and Table 24, “Pin Name Abbreviations,” on page 58.

Table 14. SYSCLK and SYSCLK# DC Characteristics

Symbol	Description	Min	Max	Units

VThreshold-DC	Crossing before transition is detected (DC)	400		mV
VThreshold-AC	Crossing before transition is detected (AC)	450		mV
ILEAK_P	Leakage current through P-channel pullup to VCC_CORE	–1		mA
ILEAK_N	Leakage current through N-channel pulldown to VSS (Ground)		1	mA
VCROSS	Differential signal crossover		VCC_CORE / 2±100	mV
CPIN	Capacitance *	4	25 *	pF

Note:

* The following processor inputs have twice the listed capacitance because they connect to two input pads—SYSCLK and SYSCLK#. SYSCLK connects to CLKIN/RSTCLK. SYSCLK# connects to CLKIN#/RSTCLK#.

Figure 11 shows the DC characteristics of the SYSCLK and

SYSCLK# signals.

VCROSS

VThreshold-DC = 400mV

VThreshold-AC = 450mV

Figure 11. SYSCLK and SYSCLK# Differential Clock Signals

Chapter 8

Electrical Data

37

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AMD 8 manual SYSCLK and SYSCLK# DC Characteristics, Preliminary Information, Chapter, Electrical Data

Contents

AMD AthlonTM XP Processor Model Data Sheet Preliminary InformationPublication # 25175 Rev. H Issue Date March 2001-2003 Advanced Micro Devices, Inc. All rights reserved Preliminary InformationTrademarks 2 Interface Signals Contents3 Logic Symbol Diagram 4 Power Management Processor Model 8 Specifications9 Signal and Power-Up Requirements AMD Athlon XP Processor Model 8 Data Sheet8 Electrical Data 10 Mechanical DataAppendix B Conventions and Abbreviations 12 Ordering InformationTable of Contents Preliminary InformationPreliminary Information AMD Athlon XP Processor Model 8 Data Sheet25175H- March List of Figures List of FiguresPreliminary Information Preliminary Information AMD Athlon XP Processor Model 8 Data SheetList of Figures 25175H- MarchList of Tables List of TablesPreliminary Information Preliminary Information AMD Athlon XP Processor Model 8 Data SheetList of Tables Revision History Revision HistoryPreliminary Information Preliminary Information AMD Athlon XP Processor Model 8 Data SheetRevision History Chapter 1 OverviewOverview Preliminary InformationAMD Athlon XP Processor Model 8 Data Sheet 1.1 QuantiSpeed Architecture SummaryPreliminary Information OverviewChapter Preliminary InformationOverview Preliminary Information AMD Athlon XP Processor Model 8 Data SheetOverview Chapter2.2 Signaling Technology 2 Interface SignalsInterface Signals 2.1 Overview2.3 Push-Pull PP Drivers 2.4 AMD Athlon System Bus SignalsAMD Athlon XP Processor Model 8 Data Sheet Interface SignalsData Probe/SysCMD Request Power Management and Initialization 3 Logic Symbol DiagramFigure 2. Logic Symbol Diagram Logic Symbol DiagramLogic Symbol Diagram AMD Athlon XP Processor Model 8 Data SheetPreliminary Information Chapter4.1 Power Management States 4 Power ManagementPower Management Preliminary InformationNote In all power management states that the processor is AMD Athlon System Bus Specification, order#powered, the system must not stop the system clock SYSCLK/SYSCLK# to the processorPreliminary Information Power ManagementThere are two mechanisms for asserting STPCLK#-hardware and software ChapterAMD Athlon XP Processor Model 8 Data Sheet Connect and Disconnect ProtocolPower Management Preliminary InformationPower Management The Northbridge contains BIOS programmable registers to enable the system bus disconnect in response to Halt and Stop Grant special cycles. When the Northbridge receives the Halt or Stop Grant special cycle from the processor and, if there are no outstanding probes or data movements, the Northbridge deasserts CONNECT a minimum of eight SYSCLK periods after the last command sent to the processor. The processor detects the deassertion of CONNECT on a rising edge of SYSCLK and deasserts PROCRDY to the Northbridge. In return, the Northbridge asserts CLKFWDRST in anticipation of reestablishing a connection at some later pointPreliminary Information ChapterPower Management AMD Athlon XP Processor Model 8 Data SheetPreliminary Information 4. The processor responds to the Northbridge by deasserting PROCRDYPreliminary Information Power Management3. The Northbridge asserts CONNECT Chapter7/D,C Figure 6. Northbridge Connect State DiagramAMD Athlon XP Processor Model 8 Data Sheet Power ManagementConnect 6/B Figure 7. Processor Connect State Diagram2/B Connect Pending DisconnectAMD Athlon XP Processor Model 8 Data Sheet 4.3 Clock ControlPower Management Preliminary InformationAMD Processor Recognition Application Note, order# 5 CPUID SupportAMD Athlon Processor Recognition Application Note Addendum, order# CPUID SupportPreliminary Information AMD Athlon XP Processor Model 8 Data SheetCPUID Support ChapterChapter Preliminary InformationPreliminary Information AMD Athlon XP Processor Model 8 Data SheetMaximum Die Working State C0Chapter Preliminary Information6.2 Advanced 266 FSB AMD Athlon XP Processor Model SYSCLK and SYSCLK# AC CharacteristicsFigure 8. SYSCLK Waveform AMD Athlon XP Processor Model 8 Data SheetAMD Athlon System Bus AC Characteristics 6.3 Advanced 266 FSB AMD Athlon System Bus AC CharacteristicsPreliminary Information ChapterPreliminary Information AMD Athlon XP Processor Model 8 Data SheetChapter 25175H- MarchPreliminary Information Table 5. Electrical and Thermal SpecificationsChapter 62.0 WAMD Athlon XP Processor Model 8 Data Sheet Figure 9. SYSCLK WaveformFigure 9 shows a sample waveform of the SYSCLK signal Preliminary InformationAMD Athlon System Bus AC Characteristics 7.3 Advanced 333 FSB AMD Athlon System Bus AC CharacteristicsPreliminary Information ChapterPreliminary Information AMD Athlon XP Processor Model 8 Data SheetChapter 25175H- March8 Electrical Data 8.2 Interface Signal Groupings8.1 Conventions Electrical DataAMD Athlon XP Processor Model 8 Data Sheet Interface Signal Groupings continuedRESET#, INTR, NMI, SMI#, INIT#, A20M#, FERR, IGNNE# Preliminary Information8.3 Voltage Identification VID40 8.5 VCCA AC and DC Characteristics8.4 Frequency Identification FID30 Preliminary InformationTable 12. VCCCORE AC and DC Characteristics 8.7 VCCCORE Characteristics8.6 Decoupling AMD Athlon XP Processor Model 8 Data SheetPreliminary Information Figure 10. VCCCORE Voltage WaveformChapter Electrical DataTable 13. Absolute Ratings 8.8 Absolute RatingsAMD Athlon XP Processor Model 8 Data Sheet Preliminary InformationPreliminary Information 8.9 SYSCLK and SYSCLK# DC CharacteristicsChapter Electrical DataTable 15. AMD Athlon System Bus DC Characteristics 8.10 AMD Athlon System Bus DC CharacteristicsAMD Athlon XP Processor Model 8 Data Sheet Preliminary InformationTable 16. General AC and DC Characteristics 8.11 General AC and DC CharacteristicsPreliminary Information ChapterAMD Athlon XP Processor Model 8 Data Sheet Table 16. General AC and DC Characteristics continuedPreliminary Information Electrical Data50 Ω ±3% Open-Drain Pin IOL = Output Current2 8.12 Open-Drain Test CircuitFigure 12. General ATE Open-Drain Test Circuit Preliminary InformationAMD Athlon XP Processor Model 8 Data Sheet 8.13 Thermal Diode CharacteristicsThermal Diode Electrical Characteristics Preliminary InformationAMD Thermal, Mechanical, and Chassis Cooling Design Guide, order# AMD Athlon Processor-Based Motherboard Design Guide, order#Preliminary Information ChapterTable 19. APIC Pin AC and DC Characteristics 8.14 APIC Pins AC and DC CharacteristicsTable 18. Guidelines for Platform Thermal Protection of the Processor AMD Athlon XP Processor Model 8 Data Sheet9.1 Power-Up Requirements 9 Signal and Power-Up RequirementsSignal and Power-Up Requirements Preliminary Information1. RESET# must be asserted before PWROK is asserted AMD Athlon XP Processor Model 8 Data SheetSignal and Power-Up Requirements Preliminary Information4. PWROK assertion to deassertion of RESET# AMD Athlon XP Processor Model 8 Data SheetSignal and Power-Up Requirements Preliminary InformationAMD Athlon XP Processor Model 8 Data Sheet 9.2 Processor Warm Reset RequirementsSignal and Power-Up Requirements Preliminary Information10.1 Die Loading 10 Mechanical DataMechanical Data Preliminary InformationTable 21. Part Number 27291 OPGA Package Dimensions for AMD Athlon 10.2 Part Number 27291 OPGA Package Dimensions forAMD Athlon XP Processors Model 8 with a CPUID of XP Processors Model 8 with a CPUID ofTable 22. Part Number 27291 OPGA Package Dimensions for 10.3 Part Number 27291 OPGA Package Dimensions forAMD Athlon XP Processors Model 8 with a CPUID of 1. Dimensions are given in millimetersPreliminary Information AMD Athlon XP Processor Model 8 Data SheetMechanical Data ChapterTable 23. Part Number 27648 OPGA Package Dimensions for 10.4 Part Number 27648 OPGA Package Dimensions for1. Dimensions are given in millimeters AMD Athlon XP Processors Model 8 with a CPUID ofPreliminary Information AMD Athlon XP Processor Model 8 Data SheetMechanical Data Chapter11 Pin Descriptions 11.1 Pin Diagram and Pin Name AbbreviationsPin Descriptions Preliminary InformationAMD Athlon XP Processor Figure 16. AMD Athlon XP Processor Model 8 Pin Diagram-Topside ViewModel Topside ViewChapter Pin Descriptions Bottomside ViewAMD Athlon XP Processor Model 8 Data Sheet ModelAMD Athlon XP Processor Model 8 Data Sheet Table 24. Pin Name AbbreviationsPreliminary Information Pin DescriptionsPreliminary Information Table 24. Pin Name Abbreviations continuedChapter Pin DescriptionsPreliminary Information AMD Athlon XP Processor Model 8 Data SheetTable 24. Pin Name Abbreviations continued Pin DescriptionsTable 24. Pin Name Abbreviations continued Preliminary InformationChapter Pin DescriptionsPreliminary Information AMD Athlon XP Processor Model 8 Data SheetTable 24. Pin Name Abbreviations continued Pin DescriptionsTable 24. Pin Name Abbreviations continued Preliminary InformationChapter Pin DescriptionsPreliminary Information AMD Athlon XP Processor Model 8 Data SheetTable 24. Pin Name Abbreviations continued Pin DescriptionsPreliminary Information 11.2 Pin ListChapter Pin DescriptionsAMD Athlon XP Processor Model 8 Data Sheet Table 25. Cross-Reference by Pin LocationPreliminary Information Pin DescriptionsChapter Preliminary InformationPin Descriptions SDATAINCLK3#Preliminary Information AMD Athlon XP Processor Model 8 Data SheetPin Descriptions SDATAINCLK1#Chapter Preliminary InformationPin Descriptions Preliminary Information AMD Athlon XP Processor Model 8 Data SheetPin Descriptions SDATAINCLK0#Chapter Preliminary InformationPin Descriptions Preliminary Information AMD Athlon XP Processor Model 8 Data SheetPin Descriptions Table 25. Cross-Reference by Pin Location Preliminary InformationChapter Pin Descriptions11.3 Detailed Pin Descriptions See the AMD Athlon System Bus Specification, order#AMD Athlon XP Processor Model 8 Data Sheet Preliminary InformationMotherboard Design Guide, order# Circuits” chapter of the AMD Athlon Processor-BasedPreliminary Information ChapterAMD Athlon XP Processor Model 8 Data Sheet Table 26. FID30 Clock Multiplier EncodingsPreliminary Information Pin DescriptionsPreliminary Information JTAG PinsFLUSH# Pin IGNNE# PinK7CLKOUT# Pins AMD Athlon XP Processor Model 8 Data SheetKey Pins NC Pinspage 35 and the AMD Athlon Processor-Based Motherboard see the AMD Athlon System Bus Specification, order#Preliminary Information ChapterAMD Athlon XP Processor Model 8 Data Sheet the AMD Athlon Processor-Based Motherboard Design GuidePreliminary Information AMD Athlon Processor-Based Motherboard Design Guide, order#Standard AMD Athlon XP Processor Model 8 Products 12 Ordering InformationFigure 18. OPN Example for the AMD Athlon XP Processor Model Ordering InformationPreliminary Information AMD Athlon XP Processor Model 8 Data SheetOrdering Information ChapterThermal Diode Calculations Appendix AIdeal Diode Equation Appendix A - Thermal Diode CalculationsAMD Athlon XP Processor Model 8 Data Sheet Temperature Offset CorrectionPreliminary Information --- I-- high------  cancellationT die , spec + 273.15 ⋅ ln = T die , spec + 273.15 ⋅Preliminary Information AMD Athlon XP Processor Model 8 Data SheetAppendix A - Thermal Diode Calculations 25175H- MarchAppendix B Signals and BitsConventions and Abbreviations Appendix B - Conventions and AbbreviationsAMD Athlon XP Processor Model 8 Data Sheet Data TerminologyPreliminary Information Table 31. Abbreviations Abbreviations and AcronymsPreliminary Information Appendix B - Conventions and AbbreviationsTable 32. Acronyms Table 31. Abbreviations continuedAMD Athlon XP Processor Model 8 Data Sheet Preliminary InformationPreliminary Information Table 32. Acronyms continuedAppendix B - Conventions and Abbreviations Zero Delay Buffer AMD Athlon XP Processor Model 8 Data SheetPreliminary Information Table 32. Acronyms continuedAMD Athlon Processor x86 Code Optimization Guide, order# Related PublicationsBuilders Guide for Desktop/Tower Systems, order# Preliminary InformationPreliminary Information AMD Athlon XP Processor Model 8 Data SheetAppendix B - Conventions and Abbreviations 25175H- March