Appendix A: Acronyms and Abbreviations

Table 1. Acronyms and Abbreviations
Term Definition
AER Advanced Error Reporting
ARI Alternative Routing-ID Interpretation
ASPM Active-state power management
AXI Advanced eXtensible Interface
EP Endpoint
PCIe Peripheral Component Interface Express
PNP Posted/Non-Posted
SOP Start Of Packet
EOP End Of Packet
CRC Cyclic Redundancy Check
LCRC Link Cyclic Redundancy Check
DLLP Data Link Layer Packet
LTSSM Link Training and Status State Machine
TLP Transaction Layer Packet
AER Advanced Error Reporting
FLR Function-Level Reset
PBA Pending Bit Array
MSI Message-Signaled Interrupt
OS Ordered Set
ASPM Active State Power Management
UR Unsupported request
LTR Latency Tolerance Reporting
PTM Precision Time Measurement
RP Root Port
OBFF Optimized Buffer Flush/Fill
IDO ID-based Ordering
VC Virtual Channel
Register notation
R Read Only for Software Root Complex.
RW The software can read or write. Write access to configuration registers through the local management interface.
WOCLR Software has to write a 1 to clear. The PCIe Controller sets the bit and software clears the bit.
R/WOCLR The software can read or write. The software has to write a 1 to clear. The PCIe Controller sets the bit and software clears the bit.
W Write Only Register Field. A read will return 00s.