Part 2.3: Sfp+ Optical Fiber Interface - Alinx KINTEX UltraScale FPGA AXKU042 User Manual

KINTEX UltraScale+ FPGA Board AXKU042 User Manual

Part 2.3: SFP+ Optical fiber interface

AXKU042 FPGA development board has a two SFP interface. The Users can buy
SFP optical modules (1.25G, 2.5G, 10G optical modules on the market) and insert
them into these 2 optical fiber interfaces for optical fiber data communication. The 2
optical fiber interfaces are respectively connected with 2 RX/TX of FPGA BANK226
GTH transceiver. Both the TX signal and the RX signal are connected to the FPGA and
the optical module through a DC blocking capacitor in a differential signal mode, and
the data rate of each TX transmission and RX reception is as high as 16.3Gb/s. The
reference clock of the GXH transceiver of BANK226 is provided by a differential crystal
oscillator 156.25M.
The design diagram of FPGA and SFP fiber is shown in Figure 2-3-1 below:
st
The 1 fiber interface FPGA pin assignment is as follows:
Signal Name
SFP1_TX_P
SFP1_TX_N
SFP1_RX_P
SFP1_RX_N
SFP1_TX_DIS
SFP1_LOSS
The 2nd fiber interface FPGA pin assignment is as follows:
Signal Name
SFP2_TX_P
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Figure 2-3-1 SFP Fiber schematic diagram
FPGA Pin
U4 SFP Optical Module Data Transmit Positive
U3 SFP Optical Module Data Transmit Negative
T2 SFP Optical Module Data Transmit Positive
T1 SFP Optical Module Data Transmit Negative
AN11 SFP optical module transfer Disable, active high
AP9 SFP light optical LOSS,High level means no light signal is received
FPGA Pin
W4 SFP Optical Module Data Transmit Positive
Description
Description
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