ARTIX-7 FPGA Development Board AX7101 User Manual
Part 3.3: SFP Interface
The AX7101 FPGA carrier board has four optical interfaces. Users can
purchase SFP optical modules (1.25G, 2.5G optical modules on the market)
and insert them into these four optical interfaces for optical data
communication. The four fiber interfaces are connected to the two RX/TX of the
GNK transceiver of the FPGA. The TX signal and the RX signal are connected
to the FPGA and the optical module through the DC blocking capacitor in
differential signal mode. The TX and RX data rates are up to each 6.6Gb/s per
channel. The reference clock for the GTX transceiver is provided by the
125Mhz differential clock of AC7100B FPGA core board.
Figure 3-3-1 detailed the schematic diagram of FPGA and fiber design
Figure 3-3-1: SFP Interface Schematic
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