Alinx ZYNQ 7000 User Manual page 40

burning the FPGA. If you want to connect 5V equipment, you need to
connect level conversion chip.
A 33 ohm resistor is connected in series between the expansion port and
the FPGA connection to protect the FPGA from external voltage or current. The
P and N traces on the PCB design use differential traces to control the
differential impedance to 100 ohms. The circuit of the expansion port (J10) is
shown in Figure 7-9:
Figure 7-10 shows the physical diagram of the J10 expansion port. Pin1,
Pin2 and Pin39 of the expansion port, Pin40 has been marked on the board.
Figure 7-10: Expansion header J10 on the FPGA Board
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ZYNQ FPGA Development Board AX7020 User Manual
Figure 7-9: Expansion header J10 schematic