Pmod RJ45 Reference Manual
The Digilent PmodRJ45(Revision A) enables long distance connectivity between devices by providing users with a standardRJ45(8P8C) port.
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Features
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StandardRJ45(8P8C) port
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Male and female connectors for host and peripheral connectivity
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6-pin Pmod connector with GPIO interface
功能描述
The Pmod RJ45 utilizes the traces onRJ45cables (Ethernet cables) to transmit signals through the cable to the other side. Although the cables are typically used for Ethernet, the data lines can also be used as general purpose inputs and/or outputs as they are essentially just wires. The benefit is to be able to use a widely used shielded cable that nicely contains and conceals all of the data and power wires.
Interfacing with the Pmod
The Pmod RJ45 communicates with the host board via theGPIO protocol. Since there are four data wires available, other communication protocols such as UART, SPI, or I²C could also be sent through these wires as long as theRJ45cable is not prohibitively long for the the specific protocol to work correctly.
Pinout Description Table
| Pin | Signal | Description |
|---|---|---|
| 1 | 7 | Signal 7 of the RJ45 port |
| 2 | 5 | Signal 5 of the RJ45 port |
| 3 | 3 | Signal 3 of the RJ45 port |
| 4 | 1 | Signal 1 of the RJ45 port |
| 5 | GND | Power Supply Ground |
| 6 | VCC | Power Supply (3.3V/5V) |
Any external power applied to the Pmod RJ45 must be within the limitations of the device receiving power on the other end of the Ethernet cable.
Physical Dimensions
The pins on the pin header are spaced 100 mil apart. The PCB is 1.375 inches long on the sides parallel to the pins on the pin header and 0.8 inches long on the sides perpendicular to the pin header.
Additional Information
The schematics of the male Pmod RJ45 are availablehere; the female schematics are availablehere.
Example code demonstrating how to get information from the Pmod RJ45 can be foundhere.
If you have any questions or comments about the Pmod RJ45, feel free to post them under the appropriate section (“Add-on Boards”) of theDigilent Forum.