The Pmod Standard developed by Digilent is a peripheral protocol, interconnect and form-factor guideline supported by various FPGA and microcontroller development boards. Digilent manufacture a wide variety of modules which conform to the Pmod standard. Some development boards which support the standard are listed below.
Board | Manufacturer | FPGA | Price | Buy |
---|---|---|---|---|
iCESugar | MuseLab | Lattice ICE40UP5K | $35 USD | MuseLab AliExpress Store |
Mimas V2 | Numato Lab | Xilinx XC6SLX9 | $50 USD | Numato Lab Store |
iCEBreaker | 1BitSquared | Lattice iCE40UP5K | $65 USD | 1BitSquared Store |
ULX3S | Radiona | Lattice LFE5U-12F / LFE5U-85F | $115 / $155 USD | Radiona Crowd Supply Store |
ECPIX-5 | LambdaConcept | Lattice LFE5U-45F / LFE5U-85F | €99 / €149 | LambdaConcept Store |
Arty A7 | Digilent | Xilinx XC7A35T / XC7A100T | $129 / $249 USD | Digilent Store |
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SFP PmodInterface for Small Form-factor Pluggable (SFP) modules |
The Pmod standard assumes a maximum current draw per Pmod of 100mA. Check your development board is capable of supplying the required current through the Pmod connectors before plugging in a SFP module.
EAGLE Schematic
PDF Schematic
EAGLE Board
PCB Gerbers
Octopart BOM
The PCB is a 4-layer impedance controlled board which uses the JLC7628 stackup and JLCPCB design rules. Project files and gerbers were built with Autodesk EAGLE 9.6.2.
This module uses a single 12-pin 0.1" header to interface with the host board.
Pin | Name | Description |
---|---|---|
TXD |
Transmit Data | Single-ended input to differential transmitter |
RXD |
Receive Data | Single-ended output of differential receiver |
LOS |
Loss of Signal | Active high output indicating optical power level is below receiver threshold. |
FLT |
Transmitter Fault | Active high output indicating low optical output at the transmitter. Toggling DIS will reset the transmitter to recover from the fault condition. |
DIS |
Transmitter Disable | Enable the transmitter by pulling this pin LOW .If left floating or HIGH the transmitter will be disabled. |
DET |
Module Detect | Pulled low by the SFP module after successful startup |
SDA |
Serial Data | Data line of two-wire diagnostic and monitoring (MOD_DEF) interface |
SCL |
Serial Clock | Clock line of two-wire diagnostic and monitoring (MOD_DEF) interface |
VCC |
Supply | Power supply from host board (3.3V DC) |
GND |
Ground | Common ground with host board |
Manufacturer / Model | Nominal Data Rate | Optical Wavelength | Lowest Stable Rate (50% duty cycle) |
---|---|---|---|
Cisco GLC-SX-MM | 1.25 Gbps (1000BASE-SX 1GbE) | 850 nm | 50 kHz |
Finisar FTLF8524P2BNL | 1.062, 1.25, 2.125, 4.25 Gbps | 850 nm | 50 kHz |
SFP Design Guide
SFP Diagnostic Monitoring Interface Specification