PCIe tutorials & labs.

The most complete PCI Express curriculum on the internet — from first principles (why shared buses stopped scaling, why switched serial fabrics won) before lanes and speeds, then through the layered architecture, enumeration, configuration space, BARs, TLPs, DLLPs, flow control, the physical layer and LTSSM, interrupts, DMA, switches, performance, RTL design, verification, debugging, system integration, and interview mastery.