Introduction to PMOD Interface on Xilinx FPGA

Welcome FPGA engineers to join the official WeChat technical group

Clickthe blue textto follow us at FPGA Home – the best and largest FPGA pure engineer community in China

The Pmod interface standard was established by Xilinx’s third-party partner Digilent, and apart from the commonly seen FMC expansion interface, Pmod interface applications are becoming increasingly widespread. Due to the flexibility of the FPGA I/O interface, the Pmod interface is particularly suitable for connecting FPGA development boards with peripherals. Additionally, Digilent has introduced various pin arrangements to facilitate connections with specific microcontrollers.

1. Connector Standards

The Pmod interface is divided into HOST and Peripheral types, categorized into 6-pin, 8-pin, and 12-pin types, as detailed in the “Digilent Pmod Interface Specification Revision: November 20, 2011“.

2. I/O Signal Definitions

For different applications, the signal definitions of the connectors vary by interface type. Please refer to the table below:

Interface Type	Pin Num	Signal	Direction
I2C Interface	1/2	SCL
3/4	SDA
5/6	GND
7/8	VCC
Pmod Interface Type 1 (GPIO)	1	IO1	In/Out
2	IO2	In/Out
3	IO3	In/Out
4	IO4	In/Out
5	GND
6	VCC
Pmod Interface Type 2 (SPI)	1	SS	Out
2	MOSI	Out
3	MISO	In
4	SCK	Out
5	GND
6	VCC
Pmod Interface Type 2A (expanded SPI)	1	SS	Out
2	MOSI	Out
3	MISO	In
4	SCK	Out
5	GND
6	VCC
7	INT	In
8	RESET	Out
9	N/S	not-specified
10	N/S	not-specified
11	GND
12	VCC
Pmod Interface Type 3 (UART)	1	CTS	Out
2	RTS	In
3	RXD	In
4	TXD	Out
5	GND
6	VCC
Pmod Interface Type 4 (UART)	1	CTS	In
2	TXD	Out
3	RXD	In
4	RTS	Out
5	GND
6	VCC
Pmod Interface Type 4A (expanded UART)	1	CTS	In
2	TXD	Out
3	RXD	In
4	RTS	Out
5	GND
6	VCC
7	INT	In
8	RESET	Out
9	N/S
10	N/S
11	GND
12	VCC
Pmod Interface Type 5 (H-Bridge)	1	DIR	Out
2	EN	Out
3	SA	In
4	SB	In
5	GND
6	VCC
Pmod Interface Type 6 (dual H-Bridge)	1	DIR1	Out
2	EN1	Out
3	DIR2	Out
4	EN2	Out
5	GND
6	VCC

Note: ‘Out’ means from the host to the peripheral; ‘In’ means from the peripheral to the host. For detailed information, please refer to the interface standard: “Digilent Pmod Interface Specification Revision: November 20, 2011“.

​​​

Welcome FPGA, embedded, signal processing engineers to follow our public account

National Largest FPGA WeChat Technical Group

We welcome everyone to join the national FPGA WeChat technical group, which has tens of thousands of engineers, a group of technology enthusiasts. FPGA engineers here help each other and share knowledge, creating a strong technical atmosphere! Hurry up and invite your friends to join!!

Press and hold to join the FPGA national technical group

FPGA Home Component City

Advantageous component services, please scan to contact the group owner: Jin Juan Email: [email protected] Welcome recommendations for procurement

ACTEL, AD part advantageous ordering (operating the full series):

XILINX, ALTERA advantageous stock or ordering (operating the full series):

(The above components are part of the models, for more models please consult the group owner Jin Juan)

Service philosophy: FPGA Home component self-operated city aims to facilitate engineers in quickly and conveniently purchasing components. After years of dedicated service, our customer service covers large listed companies, military research units, and small and medium enterprises. Our biggest advantage is emphasizing the service-first philosophy, and achieving fast delivery and favorable prices!

Directly operated brands: Xilinx ALTERA ADI TI NXP ST E2V, Micron and over a hundred other component brands, especially adept at handling components subject to US export restrictions to China,we welcome engineer friends to recommend us to procurement or consult us directly!We will continue to provide the best service in the industry!

Official thanks to brands in the FPGA technical group: Xilinx, Intel (Altera), Microsemi (Actel), Lattice, Vantis, Quicklogic, Lucent, etc.