DIGILENT PmodNIC100 Ethernet Controller Module User Manual
- June 3, 2024
- DIGILENT
Table of Contents
DIGILENT PmodNIC100 Ethernet Controller Module
Overview
The Digilent PmodNIC100 is a standalone Ethernet Controller to provide Ethernet functionality to any system board.
Features include:
- IEEE 802.3 compatible Ethernet controller
- 10/100 Mb/s data rates
- MAC and PHY support
- 10BASE-T support and 100Base-TX support
- Small PCB size for flexible designs 1.8“ × 0.8” (4.6 cm × 2.0 cm)
- 12-pin Pmod connector with SPI interface
- Follows Digilent Pmod Interface Specification Type 2A
Functional Description
The PmodNIC100 utilizes Microchip’s ENC424J600 Stand-Alone 10/100 Ethernet Controller. By providing both MAC and PHY support, Ethernet functionality at data rates up to 10 Mbit/s is achievable for any system board.
Interfacing with the Pmod
The PmodNIC100 communicates with the host board via the SPI protocol. By
leaving the Interrupt/SPI Select (INT/SPISEL) pin floating or at a logic level
high voltage within the first 1 to 10 μS, the SPI mode is enabled. Users may
then bring the Chip Select (CS) line to a logic low voltage state to initiate
communication with the Ethernet Controller.
Note that this Pmod only provides the hardware at the physical layer (PHY) and
the media access control (MAC) for a network interface. Users must provide
their own protocol stack software (such as TCP/IP). Digilent provides a set of
libraries providing Ethernet support that is available for download on the
PmodNIC100 product page
Pinout Description Table
| Pin | Signal | Description |
|---|---|---|
| 1 | CS | Chip Select |
| 2 | MOSI | Master-Out-Slave-In |
| 3 | MISO | Master-In-Slave-Out |
| 4 | SCLK | Serial Clock |
| 5 | GND | Power Supply Ground |
| 6 | VCC | Power Supply (3.3V) |
| 7 | ~INT/SPISEL | Interrupt Signal/SPI Enable |
| 8 | NC | Not Connected |
| 9 | NC | Not Connected |
| 10 | NC | Not Connected |
| 11 | GND | Power Supply Ground |
| 12 | VCC | Power Supply (3.3V) |
Any external power applied to the PmodNIC100 must be within 3V and 3.6V; however, it is strongly recommended that the Pmod is operated at 3.3V.
Physical Dimensions
The pins on the pin header are spaced 100 mil apart. The PCB is 1.8 inches long on the sides parallel to the pins on the pin header (2.05 inches long including the Ethernet port) and 0.8 inches long on the sides perpendicular to the pin header
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