Version 3 (modified by murphpo, 15 years ago) (diff) |
---|
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.
Overview
Requirements:
- WARP FPGA Board v2.2
- WARP Clock Board v1.1
- 2 SFP 1000Base-T Ethernet modules (inserted in MGTs 7 and 8)
- PC with terminal emulator and serial or USB port
- 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.