SPARC T5-4 Server Service Manual

Understanding PCIe Root Complex Connections

All 16 PCIe slots support PCIe cards with the following characteristics:

• Hot-plug low-profile adapters

• x8 Gen1, x8 Gen2, and x8 Gen3 cards

A root complex is the CMP circuitry that provides the base to a PCIe I/O fabric. Each PCIe I/O fabric consists of the PCIe switches, PCIe slots, and leaf devices associated with the root complex. Understanding the relationship of the PCIe root complexes to the PCIe I/O fabrics will help you properly assign devices when configuring Oracle VM Server for SPARC logical domains.

These topics explain the root complex configurations:

• PCIe Root Complex Connections (Single-Processor Configurations)

• PCIe Root Complex Connections (Dual-Processor Configurations)