PCI-SIG 'PCI Express 6.0 Specification' page

PCI-SIG's own page for the generation, carrying the authoritative headline figure: '64.0 GT/s raw data rate and up to 256.0 GB/s via x16 configuration', plus 'Pulse Amplitude Modulation with 4 levels (PAM4) signaling' and 'Flit (flow control unit) based encoding'. THE KEY POINT FOR THIS REPO: the 256.0 GB/s x16 figure is a BIDIRECTIONAL AGGREGATE (both TX and RX lanes of a dual-simplex x16), so the per-direction rate is half of it. Recording 256 as per-direction overstates PCIe 6.0 by 2x. Establishes the generational ladder against the sibling PCIe 6.0 generations.