The Triple-Speed Ethernet Intel® FPGA IP core consists of a 10/100/1000 Mbps Ethernet media access control (MAC) and physical coding sublayer (PCS) intellectual property (IP). This IP function enables Intel FPGAs to interface to an external Ethernet PHY device, which interfaces to the Ethernet network.
This IP is offered in MAC-only mode or in MAC+PHY mode. In the MAC only mode, the IP uses an external PHY chip to do signaling. The two supported interfaces to the external PHYs are: GMII (8 bit interface at 125 MHz SDR) and RGMII (4 bit interface at 125 MHz DDR). In the MAC+PHY mode, the PHY is realized using on-chip transceivers or LVDS I/O with dynamic phase alignment (DPA) logic that can operate up to 1.25 Gbps. SGMII or 1000Base-X protocol is used in this case. The usage of LVDS I/Os enables very scalable multiport gigabit Ethernet (GbE) system designs while saving the serial transceivers for higher performance protocols.
Figure 1 shows the Triple-Speed Ethernet Intel FPGA IP core in an Intel FPGA with a serial transceiver or with LVDS I/Os with DPA. The physical medium attachment (PMA) in the embedded serial transceivers is compliant to the IEEE 1000BASE-X PMA standard and compatible with SGMII specification. The PMA can alternatively be implemented using LVDS I/O with DPA for realizing a SGMII interface.