SFP-Ethernet Design

This design provides an example of using the SFP MGT interfaces on the WARP FPGA Board v2.2 as gigabit Ethernet interfaces.

Requirements:

• WARP FPGA Board v2.2
• 1 or 2 SFP 1000Base-T Ethernet modules in MGTs 7 and 8
• Xilinx EDK 10.1.03 or 11.3

Important Details

• The xps_ll_temac pcore has two ports for LocalLink clocks (LlinkTemac0_CLK and LlinkTemac1_CLK). These must be connected to the same clock signal which drives the SPLB_CLK ports on the corresponding xps_ll_fifo pcores. These signals are not connected automatically when you connect the LocalLink bus interfaces on the TEMAC and FIFO.
• The TEMAC PHY type must be set to 1000Base-T (C_PHY_TYPE = 5). The other MGT-compatible PHY type (SGMII) didn't work with our SFP Ethernet modules.
• The DCLK port on the xps_ll_temac core should be connected to a clock signal with frequency between 25 and 50MHz. It's unclear whether this signal is absolutely required for 1000Base-T modes (the Xilinx documentation is frustratingly vague), but our designs worked fine with a 40MHz DCLK.