Pcie Base Specification _verified_ 【Android】

The PCIe Base Specification is a masterpiece of backward compatibility. You can plug a Gen 1 card from 2004 into a Gen 6 slot today. It will simply "link train" at the lowest common denominator.

Moving from NRZ to PAM4 (4-level signaling) and introducing FLIT (Flow Control Unit) mode, which removes the 128b/130b overhead entirely for better efficiency. pcie base specification