Forward
The JESD204 standard separates the communication mechanism between logic devices and data converters into three layers, each with a distinct function: physical (specified in clause 5), link (64B/66B and 64B/80B encoding specified clause 7, and 8B/10B encoding specified in clause 8), and transport (specified in clause 6). The JESD204 physical layer encompasses the PMA and PMD Ethernet layers; the JESD204 link layer encompasses the FEC and PCS Ethernet layers and additional CRC and alignment functionality. Finally, the JESD204 transport layer maps to the MAC Ethernet layer.
