2.2.6.6 Transaction Descriptor - Traic Class Field....................................................................................................127
2.2.7 Memory, I/O, and Configuration Request Rules.....................................................................................................127
2.2.7.1 TPH Rules.........................................................................................................................................................131
2.2.8 Message Request Rules ...........................................................................................................................................133
2.2.8.1 INTx Interrupt Signaling - Rules ......................................................................................................................135
2.2.8.2 Power Management Messages........................................................................................................................139
2.2.8.3 Error Signaling Messages ................................................................................................................................140
2.2.8.4 Locked Transactions Support .........................................................................................................................141
2.2.8.5 Slot Power Limit Support................................................................................................................................142
2.2.8.6 Vendor_Defined Messages..............................................................................................................................143
2.2.8.6.1 PCI-SIG-Defined VDMs.............................................................................................................................144
2.2.8.6.2 LN Messages.............................................................................................................................................145
2.2.8.6.3 Device Readiness Status (DRS) Message.................................................................................................146
2.2.8.6.4 Function Readiness Status Message (FRS Message) ..............................................................................147
2.2.8.6.5 Hierarchy ID Message ..............................................................................................................................148
2.2.8.7 Ignored Messages............................................................................................................................................150
2.2.8.8 Latency Tolerance Reporting (LTR) Message..................................................................................................150
2.2.8.9 Optimized Buer Flush/Fill (OBFF) Message..................................................................................................151
2.2.8.10 Precision Time Measurement (PTM) Messages ..............................................................................................152
2.2.9 Completion Rules ....................................................................................................................................................153
2.2.10 TLP Prefix Rules .......................................................................................................................................................156
2.2.10.1 Local TLP Prefix Processing.............................................................................................................................157
2.2.10.1.1 Vendor Defined Local TLP Prefix.............................................................................................................157
2.2.10.2 End-End TLP Prefix Processing .......................................................................................................................157
2.2.10.2.1 Vendor Defined End-End TLP Prefix .......................................................................................................159
2.2.10.2.2 Root Ports with End-End TLP Prefix Supported.....................................................................................159
2.3 Handling of Received TLPs..............................................................................................................................................160
2.3.1 Request Handling Rules ..........................................................................................................................................163
2.3.1.1 Data Return for Read Requests .......................................................................................................................169
2.3.2 Completion Handling Rules....................................................................................................................................175
2.4 Transaction Ordering.......................................................................................................................................................177
2.4.1 Transaction Ordering Rules.....................................................................................................................................177
2.4.2 Update Ordering and Granularity Observed by a Read Transaction.....................................................................181
2.4.3 Update Ordering and Granularity Provided by a Write Transaction .....................................................................182
2.5 Virtual Channel (VC) Mechanism.....................................................................................................................................182
2.5.1 Virtual Channel Identification (VC ID).....................................................................................................................184
2.5.2 TC to VC Mapping.....................................................................................................................................................185
2.5.3 VC and TC Rules .......................................................................................................................................................186
2.6 Ordering and Receive Buer Flow Control.....................................................................................................................187
2.6.1 Flow Control Rules...................................................................................................................................................188
2.6.1.1 FC Information Tracked by Transmitter..........................................................................................................192
2.6.1.2 FC Information Tracked by Receiver...............................................................................................................194
2.7 Data Integrity ...................................................................................................................................................................198
2.7.1 ECRC Rules...............................................................................................................................................................198
2.7.2 Error Forwarding .....................................................................................................................................................202
2.7.2.1 Error Forwarding Usage Model .......................................................................................................................202
2.7.2.2 Rules For Use of Data Poisoning .....................................................................................................................203
2.8 Completion Timeout Mechanism ...................................................................................................................................204
2.9 Link Status Dependencies...............................................................................................................................................205
2.9.1 Transaction Layer Behavior in DL_Down Status ....................................................................................................205
5.0-1.0-PUB — PCI Express® Base Specification Revision 5.0 Version 1.0
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