Pmod Interface

Pmod interface (peripheral module interface) is an open standard defined by Digilent in the Pmod Interface Specification for connecting peripheral modules to FPGA and microcontroller development boards using 12 (8 I/O, 2 VCC, 2 GND) pins. Pmod or Pmods may also refer to modules compatible with the Pmod interface.

Overview Pmods are available from simple push buttons to more complex modules with network interfaces, analog to digital converters or liquid-crystal displays. These modules can be used with a variety of FPGA or microcontroller development boards from different vendors. The Pmod interface is designed so Pmods can be quickly connected to host boards for prototyping or evaluation purposes without soldering, but Pmods aren't quite plug and play since software and configuration is required.

Pmods come with a standard 6-pin interface of 4 signals, one ground and one power pin. Double and quad Pmods also exist. These duplicate the standard interface to allow more signals to pass through to the module.

Pmods can use either SPI, I2C or UART protocol. With I2C it is possible to use a 4-pin connector. Alternatively the pins 1 to 4 can be used as simple digital I/O pins.

Pinouts +Pmod type pinouts type 1(7) 2(8) 3(9) 4(10) 5(11) 6(12) Type 1 (GPIO) GPIO1 GPIO2/PWM GPIO3 GPIO4 GND Vcc Type 1A (extended GPIO) GPIO1GPIO5 GPIO2/PWMGPIO6/PWM GPIO3GPIO7 GPIO4GPIO8 GNDGND VccVcc Type 2 (SPI) CS MOSI MISO SCK GND Vcc Type 2A (extended SPI) CS1GPIO/INT MOSIGPIO/RESET MISOGPIO/CS2 SCKGPIO/CS3 GNDGND VccVcc Type 3 (UART) CTS/GPIO TxD RxD RTS/GPIO GND Vcc Type 3A (extended UART) CTS/GPIOGPIO/INT TxDGPIO/RESET RxDGPIO RTS/GPIOGPIO GNDGND VccVcc Type 4 (H-bridge) DIR EN SenseA SenseB GND Vcc Type 5 (dual H-bridge) DIR1 EN1 DIR2 EN2 GND Vcc Type 5A (extended dual H-bridge) DIR1DIR2 EN1EN2 Sense1ASense2A Sense1BSense2B GNDGND VccVcc Type 6 (I2C) nc/INT nc/RESET SCL SDA GND Vcc Type 6A (extended I2C) nc/INTGPIO nc/RESETGPIO SCLGPIO SDAGPIO GNDGND VccVcc Type 7 (I2S) LRCLKGPIO DACdataGPIO ADCdataMCLK BCLKGPIO GNDGND VccVcc

I2C/UART/SPI: INT - interrupt, slave to master, open-collector, active low RESET - reset signal, master to slave, active low SPI: CS - chipselect, active low H-bridge EN - enable, active high, can be used with PWM SenseA/SenseB - input from quadrature encoder for speed and direction

History Digilent was founded in 2000 by two Washington State University electrical engineering professors.

In 2011, v1.0.0 of Pmod Interface Specification was released.

In January 2013, National Instruments acquired all outstanding shares of Digilent Inc., which became a wholly owned subsidiary.

+ History of Pmod specification Year Version Notes Refs 2011 1.0.0 First release Pmod specification v1.0.0; Digilent; November 2011. 2017 1.1.0 . Pmod specification v1.1.0; Digilent; July 2017. 2017 1.2.0 . Pmod specification v1.2.0; Digilent; October 2017. 2020 1.3.0 . Pmod specification v1.3.0; Digilent; September 2020. 2020 1.3.1 Current release Pmod specification v1.3.1; Digilent; October 2020.

Pmod Interface

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