The AMD 1G/10G/25G Switching Ethernet Subsystem includes MAC+PCS/PMA switching subsystems in two variants as well as a PCS/ PMA switching subsystem variant. It offers a flexible solution for connection to transmit and receive data interfaces using an AXI4-Stream interface for the MAC+PCS/PMA configuration, and an XGMII/GMII interface for the PCS/PMA configuration.