PCIe Gen4规格详解：高速数据传输规范

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"PCIE Gen4 spec 是PCI Express（PCIe）第四代基础规范的文档，版本1.0，发布于2017年9月27日。这个规范详细定义了PCIe接口的传输速率、协议、错误处理机制以及一系列增强功能，是理解PCIE Gen4技术的关键参考资料。" PCI Express（PCIe）是一种高速接口标准，用于计算机系统中的外部设备通信，如显卡、网卡、硬盘等。Gen4是PCIe的第四代，相较于之前的版本，它显著提升了数据传输速度。在PCIe Base Specification Revision 4.0 Version 1.0中，主要包含了以下关键知识点： 1. **数据速率提升**：PCIe Gen4将数据传输速率提升至16 GT/s（吉比特每秒），每个通道（lane）可达到8 GT/s，双通道（x16配置）则可以实现16 GT/s的全双工传输，这意味着每秒可以传输16GB的数据，是Gen3速度的两倍。 2. **错误处理和报告**：规范中包含对内部错误报告的ECN（工程变更通知），这使得系统能够更好地检测和处理传输过程中出现的问题，提高了系统的稳定性和可靠性。 3. **多播功能**：多播ECN允许数据包同时发送给多个目的地，优化了资源利用率和效率，尤其适用于服务器和数据中心环境。 4. **原子操作**：原子操作ECN提供了更高级别的并发控制，确保在多任务环境中数据操作的完整性。 5. **可调整大小的BAR（基址寄存器）**：Resizable BAR Capability ECN允许动态分配内存资源，使设备可以根据需要获取更多的内存带宽。 6. **动态功率分配**：动态功率分配ECN使得设备能根据工作负载灵活调整功率，从而实现能效优化。 7. **基于ID的排序**：ID-Based Ordering ECN改进了数据包的排序机制，确保正确性。 8. **延迟容忍报告**：Latency Tolerance Reporting ECN提供了关于系统延迟容忍度的信息，有助于优化系统性能。 9. **替代路由ID解释（ARI）**：ARI ECN扩展了PCIe的地址空间，提高了扩展配置的灵活性。 10. **其他增强**：还包括其他ECN，如Resizable BAR、动态功率分配等，这些都旨在提升PCIe Gen4的性能、兼容性和效率。 PCIe Gen4规范的更新不仅提升了物理层的传输速度，还引入了一系列技术改进，以适应高性能计算、云计算和大数据应用的需求。通过深入理解和应用这些规范，开发者和硬件制造商能够设计出更高效、更可靠的PCIe设备和系统。

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PCI Express Base Specification, Rev. 4.0 Version 1.0

10.3.5 Invalidate Flow Control .................................................................................... 1191

10.3.6 Invalidate Ordering Semantics ......................................................................... 1192

10.3.7 Implicit Invalidation Events .............................................................................. 1193

10.3.8 PASID TLP Prefix and Global Invalidate ........................................................ 1194

10.4 PAGE REQUEST SERVICES .......................................................................................... 1195

10.4.1 Page Request Message ...................................................................................... 1196

10.4.2 Page Request Group Response Message .......................................................... 1200

10.5 CONFIGURATION ........................................................................................................ 1202

10.5.1 ATS Extended Capability Structure .................................................................. 1202

10.5.2 Page Request Extended Capability Structure ................................................... 1205

A. ISOCHRONOUS APPLICATIONS ................................................................................. 1212

A.1. INTRODUCTION .......................................................................................................... 1212

A.2. ISOCHRONOUS CONTRACT AND CONTRACT PARAMETERS ......................................... 1214

A.2.1. Isochronous Time Period and Isochronous Virtual Timeslot ........................... 1215

A.2.2. Isochronous Payload Size ................................................................................. 1216

A.2.3. Isochronous Bandwidth Allocation ................................................................... 1216

A.2.4. Isochronous Transaction Latency ..................................................................... 1217

A.2.5. An Example Illustrating Isochronous Parameters ............................................ 1218

A.3. ISOCHRONOUS TRANSACTION RULES ......................................................................... 1219

A.4. TRANSACTION ORDERING .......................................................................................... 1219

A.5. ISOCHRONOUS DATA COHERENCY ............................................................................. 1219

A.6. FLOW CONTROL ......................................................................................................... 1220

A.7. CONSIDERATIONS FOR BANDWIDTH ALLOCATION ..................................................... 1220

A.7.1. Isochronous Bandwidth of PCI Express Links.................................................. 1220

A.7.2. Isochronous Bandwidth of Endpoints ............................................................... 1220

A.7.3. Isochronous Bandwidth of Switches ................................................................. 1220

A.7.4. Isochronous Bandwidth of Root Complex......................................................... 1221

A.8. CONSIDERATIONS FOR PCI EXPRESS COMPONENTS ................................................... 1221

A.8.1. An Endpoint as a Requester .............................................................................. 1221

A.8.2. An Endpoint as a Completer ............................................................................. 1221

A.8.3. Switches............................................................................................................. 1222

A.8.4. Root Complex .................................................................................................... 1223

B. SYMBOL ENCODING .................................................................................................... 1224

C. PHYSICAL LAYER APPENDIX .................................................................................... 1233

C.1. 8B/10B DATA SCRAMBLING EXAMPLE ....................................................................... 1233

C.2. 128B/130B DATA SCRAMBLING EXAMPLE ................................................................. 1239

D. REQUEST DEPENDENCIES .......................................................................................... 1242

E. ID-BASED ORDERING USAGE .................................................................................... 1245

E.1. INTRODUCTION .......................................................................................................... 1245

E.2. POTENTIAL BENEFITS WITH IDO USE ........................................................................ 1246

E.2.1. Benefits for MFD/RP Direct Connect ............................................................... 1246

E.2.2. Benefits for Switched Environments ................................................................. 1246

E.2.3. Benefits for Integrated Endpoints ..................................................................... 1247

PCI Express Base Specification, Rev. 4.0 Version 1.0

E.2.4. IDO Use in Conjunction with RO ..................................................................... 1247

E.3. WHEN TO USE IDO .................................................................................................... 1247

E.4. WHEN NOT TO USE IDO ............................................................................................ 1248

E.4.1. When Not to Use IDO with Endpoints .............................................................. 1248

E.4.2. When Not to Use IDO with Root Ports ............................................................. 1248

E.5. SOFTWARE CONTROL OF IDO USE ............................................................................. 1249

E.5.1. Software Control of Endpoint IDO Use ............................................................ 1249

E.5.2. Software Control of Root Port IDO Use ........................................................... 1250

F. MESSAGE CODE USAGE .............................................................................................. 1251

G. PROTOCOL MULTIPLEXING ................................................................................... 1253

G.1. PROTOCOL MULTIPLEXING INTERACTIONS WITH PCI EXPRESS ................................. 1256

G.2. PMUX PACKETS ........................................................................................................ 1261

G.3. PMUX PACKET LAYOUT ........................................................................................... 1262

G.3.1. PMUX Packet Layout for 8b/10b Encoding ..................................................... 1262

G.3.2. PMUX Packet Layout at 128b/130b Encoding ................................................. 1264

G.4. PMUX CONTROL ....................................................................................................... 1267

G.5. PMUX EXTENDED CAPABILITY ................................................................................. 1267

G.5.1. PCI Express Extended Header (Offset 00h) ..................................................... 1268

G.5.2. PMUX Capability Register (Offset 04h) ........................................................... 1269

G.5.3. PMUX Control Register (Offset 08h) ............................................................... 1270

G.5.4. PMUX Status Register (Offset 0Ch) ................................................................. 1272

G.5.5. PMUX Protocol Array (Offsets 10h Through 48h) .......................................... 1275

H. FLOW CONTROL UPDATE LATENCY AND ACK UPDATE LATENCY

CALCULATIONS .................................................................................................................... 1277

H.1. FLOW CONTROL UPDATE LATENCY ........................................................................... 1277

H.2. ACK LATENCY ........................................................................................................... 1279

ACKNOWLEDGEMENTS ...................................................................................................... 1282

PCI Express Base Specification, Rev. 4.0 Version 1.0

Figures

FIGURE 1-1: PCI EXPRESS LINK .................................................................................................... 56

FIGURE 1-2: EXAMPLE TOPOLOGY ................................................................................................ 57

FIGURE 1-3: LOGICAL BLOCK DIAGRAM OF A SWITCH ................................................................. 61

FIGURE 1-4: HIGH-LEVEL LAYERING DIAGRAM ........................................................................... 63

FIGURE 1-5: PACKET FLOW THROUGH THE LAYERS ..................................................................... 64

FIGURE 2-1: LAYERING DIAGRAM HIGHLIGHTING THE TRANSACTION LAYER .............................. 69

FIGURE 2-2: SERIAL VIEW OF A TLP ............................................................................................. 72

FIGURE 2-3: GENERIC TLP FORMAT ............................................................................................. 73

FIGURE 2-4: FIELDS PRESENT IN ALL TLPS .................................................................................. 74

FIGURE 2-5: FIELDS PRESENT IN ALL TLP HEADERS .................................................................... 75

FIGURE 2-6: EXAMPLES OF COMPLETER TARGET MEMORY ACCESS FOR FETCHADD ................... 80

FIGURE 2-7: 64-BIT ADDRESS ROUTING ........................................................................................ 82

FIGURE 2-8: 32-BIT ADDRESS ROUTING ........................................................................................ 82

FIGURE 2-9: ID ROUTING WITH 4 DW HEADER ............................................................................ 84

FIGURE 2-10: ID ROUTING WITH 3 DW HEADER .......................................................................... 84

FIGURE 2-11: LOCATION OF BYTE ENABLES IN TLP HEADER ....................................................... 85

FIGURE 2-12: TRANSACTION DESCRIPTOR .................................................................................... 88

FIGURE 2-13: TRANSACTION ID .................................................................................................... 88

FIGURE 2-14: ATTRIBUTES FIELD OF TRANSACTION DESCRIPTOR ................................................ 95

FIGURE 2-15: REQUEST HEADER FORMAT FOR 64-BIT ADDRESSING OF MEMORY ........................ 98

FIGURE 2-16: REQUEST HEADER FORMAT FOR 32-BIT ADDRESSING OF MEMORY ........................ 98

FIGURE 2-17: REQUEST HEADER FORMAT FOR I/O TRANSACTIONS .............................................. 99

FIGURE 2-18: REQUEST HEADER FORMAT FOR CONFIGURATION TRANSACTIONS ...................... 100

FIGURE 2-19: TPH TLP PREFIX .................................................................................................. 101

FIGURE 2-20: LOCATION OF PH[1:0] IN A 4 DW REQUEST HEADER ........................................... 101

FIGURE 2-21: LOCATION OF PH[1:0] IN A 3 DW REQUEST HEADER ........................................... 102

FIGURE 2-22: LOCATION OF ST[7:0] IN THE MEMORY WRITE REQUEST HEADER ....................... 102

FIGURE 2-23: LOCATION OF ST[7:0] IN MEMORY READ AND ATOMICOP REQUEST HEADERS ... 103

FIGURE 2-24: MESSAGE REQUEST HEADER ................................................................................ 105

FIGURE 2-25: HEADER FOR VENDOR-DEFINED MESSAGES ......................................................... 114

FIGURE 2-26: HEADER FOR PCI-SIG-DEFINED VDMS ................................................................ 116

FIGURE 2-27: LN MESSAGE ......................................................................................................... 117

FIGURE 2-28: DRS MESSAGE ...................................................................................................... 118

FIGURE 2-29: FRS MESSAGE ...................................................................................................... 120

FIGURE 2-30: HIERARCHY ID MESSAGE ..................................................................................... 121

FIGURE 2-31: LTR MESSAGE ...................................................................................................... 123

FIGURE 2-32: OBFF MESSAGE ................................................................................................... 123

FIGURE 2-33: PTM REQUEST/RESPONSE MESSAGE ..................................................................... 124

FIGURE 2-34: PTM RESPONSED MESSAGE (4 DW HEADER AND 1 DW PAYLOAD) ...................... 125

FIGURE 2-35: COMPLETION HEADER FORMAT ............................................................................ 126

FIGURE 2-36: (NON-ARI) COMPLETER ID .................................................................................. 126

FIGURE 2-37: ARI COMPLETER ID .............................................................................................. 127

FIGURE 2-38: FLOWCHART FOR HANDLING OF RECEIVED TLPS ................................................. 133

FIGURE 2-39: FLOWCHART FOR SWITCH HANDLING OF TLPS ..................................................... 135

PCI Express Base Specification, Rev. 4.0 Version 1.0

FIGURE 2-40: FLOWCHART FOR HANDLING OF RECEIVED REQUEST ........................................... 140

FIGURE 2-41: EXAMPLE COMPLETION DATA WHEN SOME BYTE ENABLES ARE 0B ..................... 144

FIGURE 2-42: VIRTUAL CHANNEL CONCEPT – AN ILLUSTRATION .............................................. 156

FIGURE 2-43: VIRTUAL CHANNEL CONCEPT – SWITCH INTERNALS (UPSTREAM FLOW) ............. 157

FIGURE 2-44: AN EXAMPLE OF TC/VC CONFIGURATIONS .......................................................... 159

FIGURE 2-45: RELATIONSHIP BETWEEN REQUESTER AND ULTIMATE COMPLETER ..................... 160

FIGURE 2-46: CALCULATION OF 32-BIT ECRC FOR TLP END TO END DATA INTEGRITY

PROTECTION ........................................................................................................................ 177

FIGURE 3-1: LAYERING DIAGRAM HIGHLIGHTING THE DATA LINK LAYER ................................ 185

FIGURE 3-2: DATA LINK CONTROL AND MANAGEMENT STATE MACHINE .................................. 188

FIGURE 3-3: VC0 FLOW CONTROL INITIALIZATION EXAMPLE WITH 8B/10B ENCODING-BASED

FRAMING ............................................................................................................................. 196

FIGURE 3-4: DLLP TYPE AND CRC FIELDS ................................................................................ 198

FIGURE 3-5: DATA LINK LAYER PACKET FORMAT FOR ACK AND NAK ....................................... 201

FIGURE 3-6: NOP DATA LINK LAYER PACKET FORMAT ............................................................. 201

FIGURE 3-7: DATA LINK LAYER PACKET FORMAT FOR INITFC1 ................................................ 201

FIGURE 3-8: DATA LINK LAYER PACKET FORMAT FOR INITFC2 ................................................ 201

FIGURE 3-9: DATA LINK LAYER PACKET FORMAT FOR UPDATEFC ............................................ 202

FIGURE 3-10: PM DATA LINK LAYER PACKET FORMAT ............................................................. 202

FIGURE 3-11: VENDOR-SPECIFIC DATA LINK LAYER PACKET FORMAT ...................................... 202

FIGURE 3-12: DATA LINK FEATURE DLLP ................................................................................. 202

FIGURE 3-13: DIAGRAM OF CRC CALCULATION FOR DLLPS ..................................................... 204

FIGURE 3-14: TLP WITH LCRC AND TLP SEQUENCE NUMBER APPLIED ................................... 204

FIGURE 3-15: TLP FOLLOWING APPLICATION OF TLP SEQUENCE NUMBER AND RESERVED BITS

............................................................................................................................................. 207

FIGURE 3-16: CALCULATION OF LCRC ...................................................................................... 209

FIGURE 3-17: RECEIVED DLLP ERROR CHECK FLOWCHART ...................................................... 215

FIGURE 3-18: ACK/NAK DLLP PROCESSING FLOWCHART .......................................................... 216

FIGURE 3-19: RECEIVE DATA LINK LAYER HANDLING OF TLPS ................................................ 220

FIGURE 4-1: LAYERING DIAGRAM HIGHLIGHTING PHYSICAL LAYER .......................................... 225

FIGURE 4-2: CHARACTER TO SYMBOL MAPPING ......................................................................... 226

FIGURE 4-3: BIT TRANSMISSION ORDER ON PHYSICAL LANES - X1 EXAMPLE ............................ 227

FIGURE 4-4: BIT TRANSMISSION ORDER ON PHYSICAL LANES - X4 EXAMPLE ............................ 227

FIGURE 4-5: TLP WITH FRAMING SYMBOLS APPLIED ................................................................. 230

FIGURE 4-6: DLLP WITH FRAMING SYMBOLS APPLIED .............................................................. 231

FIGURE 4-7: FRAMED TLP ON A X1 LINK .................................................................................... 231

FIGURE 4-8: FRAMED TLP ON A X2 LINK .................................................................................... 232

FIGURE 4-9: FRAMED TLP ON A X4 LINK .................................................................................... 232

FIGURE 4-10: LFSR WITH 8B/10B SCRAMBLING POLYNOMIAL ................................................... 234

FIGURE 4-11: EXAMPLE OF BIT TRANSMISSION ORDER IN A X1 LINK SHOWING 130 BITS OF A

BLOCK ................................................................................................................................. 235

FIGURE 4-12: EXAMPLE OF BIT PLACEMENT IN A X4 LINK WITH ONE BLOCK PER LANE ............ 236

FIGURE 4-13: LAYOUT OF FRAMING TOKENS .............................................................................. 239

FIGURE 4-14: TLP AND DLLP LAYOUT ...................................................................................... 241

FIGURE 4-15: PACKET TRANSMISSION IN A X8 LINK ................................................................... 241

FIGURE 4-16: NULLIFIED TLP LAYOUT IN A X8 LINK WITH OTHER PACKETS ............................. 242

PCI Express Base Specification, Rev. 4.0 Version 1.0

FIGURE 4-17: SKP ORDERED SET OF LENGTH 66-BIT IN A X8 LINK ............................................ 242

FIGURE 4-18: LFSR WITH SCRAMBLING POLYNOMIAL IN 8.0 GT/S AND ABOVE DATA RATE .... 250

FIGURE 4-19: ALTERNATE IMPLEMENTATION OF THE LFSR FOR DESCRAMBLING ...................... 252

FIGURE 4-20: 8.0 GT/S EQUALIZATION FLOW ............................................................................. 260

FIGURE 4-21: 16.0 GT/S EQUALIZATION FLOW ........................................................................... 261

FIGURE 4-22: ELECTRICAL IDLE EXIT ORDERED SET FOR 8.0 GT/S AND ABOVE DATA RATES ... 273

FIGURE 4-23: MAIN STATE DIAGRAM FOR LINK TRAINING AND STATUS STATE MACHINE ........ 288

FIGURE 4-24: DETECT SUBSTATE MACHINE ............................................................................... 290

FIGURE 4-25: POLLING SUBSTATE MACHINE .............................................................................. 301

FIGURE 4-26: CONFIGURATION SUBSTATE MACHINE .................................................................. 317

FIGURE 4-27: RECOVERY SUBSTATE MACHINE ........................................................................... 344

FIGURE 4-28: L0S SUBSTATE MACHINE ...................................................................................... 350

FIGURE 4-29: L1 SUBSTATE MACHINE ........................................................................................ 352

FIGURE 4-30: L2 SUBSTATE MACHINE ........................................................................................ 354

FIGURE 4-31: LOOPBACK SUBSTATE MACHINE ........................................................................... 359

FIGURE 4-32: RECEIVER NUMBER ASSIGNMENT ......................................................................... 376

FIGURE 4-33: SUPPORTED TOPOLOGIES ................................................................................. 390

FIGURE 4-34: RETIMER CLKREQ# CONNECTION TOPOLOGY .................................................... 420

FIGURE 5-1: LINK POWER MANAGEMENT STATE FLOW DIAGRAM ............................................. 428

FIGURE 5-2: ENTRY INTO THE L1 LINK STATE ............................................................................ 437

FIGURE 5-3: EXIT FROM L1 LINK STATE INITIATED BY UPSTREAM COMPONENT ........................ 440

FIGURE 5-4: CONCEPTUAL DIAGRAMS SHOWING TWO EXAMPLE CASES OF WAKE# ROUTING . 443

FIGURE 5-5: A CONCEPTUAL PME CONTROL STATE MACHINE .................................................. 447

FIGURE 5-6: L1 TRANSITION SEQUENCE ENDING WITH A REJECTION (L0S ENABLED) ................ 460

FIGURE 5-7: L1 SUCCESSFUL TRANSITION SEQUENCE ................................................................ 461

FIGURE 5-8: EXAMPLE OF L1 EXIT LATENCY COMPUTATION ..................................................... 463

FIGURE 5-9: STATE DIAGRAM FOR L1 PM SUBSTATES ................................................................ 468

FIGURE 5-10: DOWNSTREAM PORT WITH A SINGLE PLL ............................................................. 469

FIGURE 5-11: MULTIPLE DOWNSTREAM PORTS WITH A SHARED PLL ......................................... 470

FIGURE 5-12: EXAMPLE: L1.1 WAVEFORMS ILLUSTRATING UPSTREAM PORT INITIATED EXIT ... 472

FIGURE 5-13: EXAMPLE: L1.1 WAVEFORMS ILLUSTRATING DOWNSTREAM PORT INITIATED EXIT

............................................................................................................................................. 473

FIGURE 5-14: L1.2 SUBSTATES .................................................................................................... 474

FIGURE 5-15: EXAMPLE: ILLUSTRATION OF BOUNDARY CONDITION DUE TO DIFFERENT SAMPLING

CLKREQ# ...................................................................................................................... 475

FIGURE 5-16: EXAMPLE: L1.2 WAVEFORMS ILLUSTRATING UPSTREAM PORT INITIATED EXIT ... 477

FIGURE 5-17: EXAMPLE: L1.2 WAVEFORMS ILLUSTRATING DOWNSTREAM PORT INITIATED EXIT

............................................................................................................................................. 477

FIGURE 5-18: FUNCTION POWER MANAGEMENT STATE TRANSITIONS ....................................... 480

FIGURE 5-19: NON-BRIDGE FUNCTION POWER MANAGEMENT DIAGRAM .................................. 481

FIGURE 5-20: PCI EXPRESS BRIDGE POWER MANAGEMENT DIAGRAM ...................................... 486

FIGURE 6-1: ERROR CLASSIFICATION .......................................................................................... 501

FIGURE 6-2: FLOWCHART SHOWING SEQUENCE OF DEVICE ERROR SIGNALING AND LOGGING

OPERATIONS ........................................................................................................................ 518

FIGURE 6-3: PSEUDO LOGIC DIAGRAM FOR ERROR MESSAGE CONTROLS .................................. 519

FIGURE 6-4: TC FILTERING EXAMPLE ......................................................................................... 538

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