PCI EXPRESS BASE SPECIFICATION, REV. 3.0
5
4.3. ELECTRICAL SUB-BLOCK ............................................................................................. 323
4.3.1. Electrical Specification Organization................................................................. 323
4.3.2. Interoperability Criteria for 2.5, 5.0, and 8.0 GT/s Devices .............................. 323
4.3.3. Transmitter Specification.................................................................................... 325
4.3.4. Receiver Specifications....................................................................................... 359
4.3.5. Low Frequency and Miscellaneous Signaling Requirements............................. 382
4.3.6. Channel Specification......................................................................................... 387
4.3.7. Refclk Specifications........................................................................................... 400
4.3.8. Refclk Specifications for 8.0 GT/s....................................................................... 408
5. POWER MANAGEMENT................................................................................................. 413
5.1. OVERVIEW ................................................................................................................... 413
5.1.1. Statement of Requirements.................................................................................. 414
5.2. LINK STATE POWER MANAGEMENT............................................................................. 414
5.3. PCI-PM
SOFTWARE COMPATIBLE MECHANISMS......................................................... 419
5.3.1. Device Power Management States (D-States) of a Function.............................. 419
5.3.2. PM Software Control of the Link Power Management State.............................. 424
5.3.3. Power Management Event Mechanisms............................................................. 429
5.4. N
ATIVE PCI EXPRESS POWER MANAGEMENT MECHANISMS....................................... 436
5.4.1. Active State Power Management (ASPM) .......................................................... 436
5.5. AUXILIARY POWER SUPPORT....................................................................................... 455
5.5.1. Auxiliary Power Enabling................................................................................... 455
5.6. POWER MANAGEMENT SYSTEM MESSAGES AND DLLPS............................................. 456
6. SYSTEM ARCHITECTURE ............................................................................................. 459
6.1. INTERRUPT AND PME SUPPORT ................................................................................... 459
6.1.1. Rationale for PCI Express Interrupt Model........................................................ 459
6.1.2. PCI Compatible INTx Emulation........................................................................ 460
6.1.3. INTx Emulation Software Model ........................................................................ 460
6.1.4. Message Signaled Interrupt (MSI/MSI-X) Support............................................. 460
6.1.5. PME Support....................................................................................................... 462
6.1.6. Native PME Software Model .............................................................................. 462
6.1.7. Legacy PME Software Model ............................................................................. 463
6.1.8. Operating System Power Management Notification........................................... 463
6.1.9. PME Routing Between PCI Express and PCI Hierarchies ................................ 463
6.2. E
RROR SIGNALING AND LOGGING................................................................................ 464
6.2.1. Scope................................................................................................................... 464
6.2.2. Error Classification............................................................................................ 464
6.2.3. Error Signaling................................................................................................... 466
6.2.4. Error Logging..................................................................................................... 474
6.2.5. Sequence of Device Error Signaling and Logging Operations .......................... 478
6.2.6. Error Message Controls ..................................................................................... 480
6.2.7. Error Listing and Rules ...................................................................................... 481
6.2.8. Virtual PCI Bridge Error Handling.................................................................... 486
6.2.9. Internal Errors.................................................................................................... 488
6.3. VIRTUAL CHANNEL SUPPORT ...................................................................................... 489
6.3.1. Introduction and Scope....................................................................................... 489
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