ARM DEN 0114 Copyright © 2022 Arm Limited or its affiliates. All rights reserved. Page iii
1.0 Non-Confidential
3.3.4 Coherency management for Inbound transactions 20
4 COMPLYING TO ARM memory model FOR PE GENERATED PCIE TRANSACTIONs 23
4.1 Device-nGnRnE and Device-nGnRE 24
4.1.1 PE and Interconnect requirements for handling Outbound requests to Device-nGnRnE or
Device-nGnRE mapped locations 24
4.1.2 PCIe interface requirements for handling Outbound requests to Device-nGnRnE or Device-
nGnRE mapped locations 25
4.1.3 Example use cases for Device-nGnRnE and Device-nGnRE mapping of PCIe address spaces
25
4.2 Device-nGRE and Device-GRE 26
4.2.1 PCIe interface requirements for handling Outbound requests to Device-nGRE and Device-
GRE mapped locations 26
4.3 Normal with Non-cacheable as the cacheability attribute 27
4.3.1 PCIe interface requirements for handling Outbound requests to Normal Non-cacheable
mapped memory locations 27
4.4 Complying with internal visibility requirement of the Arm memory model 27
4.4.1 PCIe interface requirements for complying with internal visibility requirement for
Outbound transactions from PEs 28
4.5 PCIe interface requirements for handling transactions with the same AXI ID 28
4.6 Interconnect requirements for preserving barrier-ordered-before ordering relation 29
4.7 Setting RO and IDO for PE transactions 29
4.7.1 Setting RO for Root-SoC PE transactions 29
4.7.2 Setting IDO for Root-SoC PE transactions 29
4.7.3 Setting RO for Endpoint-SoC PE transactions 29
4.7.4 Setting IDO for Endpoint-SoC PE transactions 30
4.8 Ordering guarantees available to software for accesses targeting PCIe destinations 30
4.8.1 Achieving producer consumer ordering for transactions from PE to PCIe destinations 32
4.8.2 Multiple PCIe address spaces mapped as Device-nGnRnE or Device-nGnRE 33
5 COMPLYING TO PCIE ORDERING MODEL 34
5.1 Ordering table coverage 34
5.2 Overtaking and Ordering 36
5.3 Overtaking Rules 38
5.3.1 Both requests Outbound 38
5.3.2 Both requests Inbound 39
5.3.3 Outbound request / Inbound Completion 40
5.3.4 Outbound completion/ Inbound request 41
