PCIe/CXL Deep Dive · All levels
PCIe/CXL Glossary
Shared vocabulary across PCIe/CXL protocol layers, enumeration, LTSSM, and RAS.
Terms to use precisely
TLP: transaction layer packet carrying memory, config, or IO requests across the fabric.
LTSSM: link training state machine governing Detect through L0 and Recovery.
Credit flow control: receiver buffer pools advertised via UpdateFC DLLPs.
AER: Advanced Error Reporting for correctable and uncorrectable PCIe errors.
Equalization: Gen3+ PHY tuning phases for transmitter presets and receiver CTLE/DFE.
HDM: Host-managed device memory decode for CXL.mem expansion regions.