Root complex - Wikipedia
EMRICK10G PCIe x1 to 4 PCIe x1 Expansion Kit, Riser Card - Conceptronic
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89HPES3T3 - 3-lane, 3-port PCIe I/O Expansion Switch | Renesas
Introduction to PCIe – Systems Research
PCIe 5.0 Customizable Embedded Multi-port Switch IP Core
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ExpEther Consortium - Technology
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89HPES24N3 - 24-lane, 3-port PCIe I/O Expansion Switch | Renesas
Code 31 in Windows Device Manager While Using a MXI Connection - NI
XIO3130 PCI Express 1:3 4-Port 4-Lane Switch - TI | Mouser
Cyclone Microsystems - PCIe-423-3 Three Slot PCI Express Switched Riser Card
Synopsys IP Technical Bulletin: PCI Express Switch Enumeration Using VMM-Based DesignWare Verification IP
89HPES10T4G2 - 10-lane, 4-port Gen2 PCIe I/O Expansion Switch | Renesas
Flashback to Basics Friday! Upstream, downstream? – Express Yourself
PCI Express System Interconnect Software Architecture - EEWeb
Amazon.com: GLOTRENDS LE8245F Dual 2.5Gbps + Dual 100/1000Mbps PCI-E NIC Ethernet Network Card for PC, RTL8125BG Chip, PCI-Express 2.0 X2, 10Gbps Upstream Bandwidth, RJ45 LAN Port : Electronics
PCIe System Architecture - Processors forum - Processors - TI E2E support forums
PCIE知识点-003：PCIE协议中的upstream概念_upstream port_IC小鸽的博客-CSDN博客
PCI Express Upstream switch port error - Aorus Gaming Box : r/eGPU
PCI Express Glossary - Rambus
