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RVCC 2.5 Standby Voltage Regulator

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8 7 6 5 Voltage Regulators D 4 3 2 VCC5DUAL 1 D VCMOS Generator For Rambus VCC2_5SBY C 9 SLP_S5# CR8 31 MMBD914LT1 VCMOS1_8SBY R259 35.7-1% C263 R258 100-1% 0.1UF B C295 VCC2_5SBY_COSC VCC2_5SBY_RUN VCC2_5SBY_ITH C294 C296 68PF 0.1UF C293 330PF 100PF C292 VCC 2.5 Standby Voltage Regulator VR7 LT1435 4 SFB 1 COSC 2 RUN/SS 3 ITH 5 SGND 6 VOSENSE 9 EXTVCC VIN 13 TG 16 SW 14 INTVCC 12 BOOST 15 BG 11 PGND 10 C299 1000PF VCC2_5SBY_TG VCC2_5SBY_SW Q11 SI4966DY VCC2_5SBY_INTVCC V_BOOST 1 +A 1 2 2 -C C312 0.1UF VCC2_5SBY_BG D3 6 D4 5 S2 3 G2 4 C315 1UF-X7R 1+ 2 C314 100UF 1+ 2 L23 10UH CDRH127-6R1 CA+ R295 SBY_ITH_R 100PF 10K Do not stuff C292. VCC2_5SBY_SENSE+ VCC2_5SBY_SENSEVCC2_5SBY_VOSENSE C306 4.7UF + C307 + 0.1UF CMDSH-3 8 D1 7 D2 1 S1 2 G1 MBRS130LT3 CR10 R297 100-1% R325 0.01 330UF 330UF 100PF VCC2_5SBY_L CR9 SENSE+ 8 SENSE- 7 R301 100-1% VCC2_5SBY Do not stuff C304. C304 C R302 11K + 1 C325 2 + 1 C326 T510 2 R294 10K B A A TITLE: INTEL(R) 820 CHIPSET CUSTOMER REFERENCE BOARD REV: VOLTAGE REGULATORS 1.01 R PCD PLATFORM DESIGN DRAWN BY: PROJECT: 1900 PRAIRIE CITY ROAD FOLSOM, CALIFORNIA 95630 LAST REVISED: SHEET: 11-18-1999_11:28 30 OF 36 8 7 6 5 4 3 2 1

Section	Page
Introduction 1	13
1.1 About This Design Guide	13
1.2 References	14
1.3 System Overview	14
1.3.1 Chipset Components	15
1.3.2 Bandwidth Summary	16
1.3.3 System Configuration	17
1.4 Platform Initiatives	20
1.4.1 Direct Rambus*	20
1.4.2 Streaming SIMD Extensions	20
1.4.3 AGP 2.0	20
1.4.4 Hub Interface	20
1.4.5 Manageability	21
1.4.6 AC’97	22
1.4.7 Low Pin Count (LPC) Interface	23
Layout/Routing Guidelines 2	27
2.1 General Recommendations	27
2.2 Component Quadrant Layout	27
2.3 Intel® 820 Chipset Component Placement	29
2.4 Core Chipset Routing Recommendations	30
2.5 Source Synchronous Strobing	31
2.6 Direct Rambus* Interface	33
2.6.1 Stackup	34
2.6.2 Direct Rambus* Layout Guidelines	34
2.6.2.1 RSL Routing	34
2.6.2.2 RSL Termination	37
2.6.2.3 Direct Rambus* Ground Plane Reference	39
2.6.2.4 Direct Rambus* Connector Compensation	40
2.6.2.5 RSL Signal Layer Alternation	46
2.6.2.6 Length Matching Methods	47
2.6.2.7 VIA Compensation	49
2.6.2.8 Length Matching & Via Compensation Example	49
2.6.3 Direct Rambus* Reference Voltage	51
2.6.4 High-speed CMOS Routing	51
2.6.4.1 SIO Routing	52
2.6.4.2 Suspend-to-RAM Shunt Transistor	52
2.6.5 Direct Rambus* Clock Routing	54
2.6.6 Direct Rambus* Design Checklist	54
2.7 AGP 2.0	57
2.7.1 AGP Interface Signal Groups	58
2.7.2 1X Timing Domain Routing Guidelines	59
2.7.3 2X/4X Timing Domain Routing Guidelines	59
2.7.4 AGP 2.0 Routing Summary	61
2.7.5 AGP Clock Routing	62
2.7.6 General AGP Routing Guidelines	62
2.7.7 VDDQ Generation and TYPEDET#	63
2.7.8 VREF Generation for AGP 2.0 (2X and 4X)	65
2.7.9 Compensation	67
2.7.10 AGP Pull-ups	67
2.7.10.1 AGP Signal Voltage Tolerance List	68
2.7.11 Motherboard / Add-in Card Interoperability	68
2.8 Hub Interface	69
2.8.1 Data Signals	70
2.8.2 Strobe Signals	70
2.8.3 HREF Generation/Distribution	70
2.8.4 Compensation	71
2.9 System Bus Design	72
2.9.1 100/133 MHz System Bus	72
2.9.2 System Bus Ground Plane Reference	73
2.10 S.E.C.C. 2 Grounding Retention Mechanism (GRM)	73
2.11 Processor CMOS Pullup Values	75
2.12 Additional Host Bus Guidelines	78
2.13 Ultra ATA/66	82
2.13.1 Ultra ATA/66 Detection	82
2.13.2 Ultra ATA/66 Cable Detection	83
2.13.3 Ultra ATA/66 Pullup/Pulldown Requirements	86
2.14 AC’97	87
2.14.1 AC’97 Signal Quality Requirements	89
2.14.2 AC’97 Motherboard Implementation	89
2.15 USB	91
2.16 ISA (82380AB)	92
2.16.1 ICH GPIO connected to 82380AB	92
2.16.2 Sub Class Code	92
2.17 IOAPIC Design Recommendation	92
2.18 SMBus/Alert Bus	93
2.19 PCI	93
2.20 RTC	93
2.20.1 RTC Crystal	94
2.20.2 External Capacitors	94
2.20.3 RTC Layout Considerations	95
2.20.4 RTC External Battery Connection	95
2.20.5 RTC External RTCRST Circuit	96
2.20.6 RTC Routing Guidelines	96
2.20.7 VBIAS DC Voltage and Noise Measurements	97
Advanced System Bus Design 3	101
3.1 Terminology and Definitions	101
3.2 AGTL+ Design Guidelines	104
3.2.1 Initial Timing Analysis	105
3.2.2 Determine General Topology, Layout, and Routing Desired	108
3.2.3 Pre-Layout Simulation	108
3.2.3.1 Methodology	108
3.2.3.2 Sensitivity Analysis	108
3.2.3.3 Monte Carlo Analysis	109
3.2.3.4 Simulation Criteria	109
3.2.4 Place and Route Board	110
3.2.4.1 Estimate Component To Component Spacing for AGTL+ Signals	110
3.2.4.2 Layout and Route Board	110
3.2.4.3 Host Clock Routing	112
3.2.4.4 APIC Data Bus Routing	112
3.2.5 Post-Layout Simulation	113
3.2.5.1 Intersymbol Interference	113
3.2.5.2 Cross-Talk Analysis	113
3.2.5.3 Monte Carlo Analysis	113
3.2.6 Validation	114
3.2.6.1 Measurements	114
3.2.6.2 Flight Time Simulation	114
3.2.6.3 Flight Time Hardware Validation	115
3.3 Theory	115
3.3.1 AGTL+	115
3.3.2 Timing Requirements	116
3.3.3 Cross-talk Theory	116
3.3.3.1 Potential Termination Cross-Talk Problems	118
3.4 More Details and Insight	119
3.4.1 Textbook Timing Equations	119
3.4.2 Effective Impedance and Tolerance/Variation	120
3.4.3 Power/Reference Planes, PCB Stackup, and High Frequency Decoupling	120
3.4.3.1 Power Distribution	120
3.4.3.2 Reference Planes and PCB Stackup	121
3.4.3.3 High Frequency Decoupling	122
3.4.3.4 SC242 Connector	123
3.4.4 Clock Routing	123
3.5 Definitions of Flight Time Measurements/ Corrections and Signal Quality	124
3.5.1 VREF Guardband	124
3.5.2 Ringback Levels	124
3.5.3 Overdrive Region	124
3.5.4 Flight Time Definition and Measurement	125
3.6 Conclusion	126
Clocking 4	129
4.1 Clock Generation	129
4.2 Component Placement and Interconnection Layout Requirements	134
4.2.1 14.318MHz Crystal to CK133	134
4.2.2 CK133 to DRCG	134
4.2.3 MCH to DRCG	135
4.2.4 DRCG to RDRAM Channel	136
4.2.5 Trace Length	136
4.3 DRCG Impedance Matching Circuit	138
4.3.1 DRCG Layout Example	139
4.4 AGP Clock Routing Guidelines	139
4.5 Series Termination Resistors for CK133 Clock Outputs	139
4.6 Unused Outputs	140
4.7 Decoupling Recommendation for CK133 and DRCG	140
4.8 DRCG Frequency Selection and the DRCG+	140
4.8.1 DRCG Frequency Selection Table and Jitter Specification	140
4.8.2 DRCG+ Frequency Selection Schematic	141
System Manufacturing 5	145
5.1 In Circuit FWH Flash BIOS Programming	145
5.2 FWH Flash BIOS Vpp Design Guidelines	145
5.3 Stackup Requirement	145
5.3.1 Overview	145
5.3.2 PCB Materials	146
5.3.3 Design Process	146
5.3.4 Test Coupon Design Guidelines	147
5.3.5 Recommended Stackup	147
5.3.6 Inner Layer Routing	147
5.3.7 Impedance Calculation Tools	148
5.3.8 Testing Board Impedance	148
5.3.9 Board Impedance/Stackup Summary	149
System Design Considerations 6	153
6.1 Power Delivery	153
6.1.1 Terminology and Definitions	153
6.1.2 Intel® 820 Chipset Customer Reference Board Power Delivery	154
6.1.3 64/72Mbit RDRAM Excessive Power Consumption	157
6.1.3.1 Option 1: Reduce the Clock Frequency During Initialization	158
6.1.3.2 Option 2: Increase the Current Capability of the 2.5V Voltage Regulator	158
6.2 Power Plane Splits	159
6.3 Thermal Design Power	159
6.4 Glue Chip 3 (Intel® 820 Chipset Glue Chip)	160
Appendix A: Reference Board Schematics: Uni-Processor	161
Reference Design Schematics: Uni-Processor A	163
Appendix B: Reference Design Schematics: Dual-Processor B	201

Match case Limit results 1 per page

11-18-1999_11:28

VOLTAGE REGULATORS

SLP_S5#

VCC2_5SBY_INTVCC

100-1%

R297

10K

R294

0.01

R325

R302

11K

100-1%

R258

35.7-1%

R259

CMDSH-3

CR9

VCC2_5SBY_ITH

VCC2_5SBY_VOSENSE

VCC2_5SBY_SENSE-

VCC2_5SBY_SENSE+

VCC2_5SBY_L

VCC2_5SBY_TG

VCC2_5SBY_BG

R295

10K

SBY_ITH_R

C295

68PF

1UF-X7R

C315

100-1%

R301

100PF

C304

100UF

C314

C312

0.1UF

V_BOOST

C306

4.7UF

C299

1000PF

C292

100PF

C293

C263

0.1UF

C307

0.1UF

330PF

C296

VR7

VCC2_5SBY_COSC

VCC2_5SBY_RUN

C294

0.1UF

CR8

MMBD914LT1

VCC2_5SBY_SW

CDRH127-6R1

10UH

L23

C326

330UF

C325

330UF

CR10

MBRS130LT3

SI4966DY

Q11

PCD PLATFORM DESIGN

REV:

DRAWN BY:

LAST REVISED:

PROJECT:

SHEET:

FOLSOM, CALIFORNIA 95630

1900 PRAIRIE CITY ROAD

1.01

TITLE: INTEL(R) 820 CHIPSET CUSTOMER REFERENCE BOARD

OF 36

VCC5DUAL

VCC2_5SBY

LT1435

RUN/SS

ITH

SGND

VIN

INTVCC

BOOST

PGND

SENSE-

SENSE+

COSC

SFB

VOSENSE

EXTVCC

VCMOS1_8SBY

VCC 2.5 Standby Voltage Regulator

VCMOS Generator For Rambus

Do not stuff C292.

Do not stuff C304.

Voltage Regulators

T510