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1300 Henley Court

Pullman, WA 99163

509.334.6306

www.store. digilent.com

Pmod VGA Reference Manual

Revised May 5, 2017

This manual applies to the Pmod VGA rev. A

DOC#: 410-345

Other product and company names mentioned may be trademarks of their respective owners.

Page 1 of 5

Overview

The Pmod VGA (Rev. A) provides a VGA port to any board with Pmod connectivity. The VGA port can be used to

drive standard displays such as televisions and monitors. The host board must be capable of driving a fast parallel

data bus in order to properly drive a display with the Pmod VGA.

1 Specifications

Signal

Description

Red 0

Red 1

Red 2

Red 3

GND

Power Supply Ground

VCC3V3

Positive Power Supply

Green 0

Green 1

Green 2

Green 3

GND

Power Supply Ground

VCC3V3

Positive Power Supply

Table 1. Pmod header J1.

The Pmod VGA.

 Standard VGA port for connecting commonly found

displays

 12-bit RGB444 color depth

 Simple, high-speed R-2R resistor ladder DAC

 High-speed buffers support pixel clocks up to 150 MHz

Summary of content (5 pages)

PAGE 1
300 Henley Court Pullman, WA 99163 509.334.6306 www.store. digilent.com Pmod VGA Reference Manual Revised May 5, 2017 This manual applies to the Pmod VGA rev. A Overview The Pmod VGA (Rev. A) provides a VGA port to any board with Pmod connectivity. The VGA port can be used to drive standard displays such as televisions and monitors. The host board must be capable of driving a fast parallel data bus in order to properly drive a display with the Pmod VGA.
PAGE 2
Pmod VGA Reference Manual Pin 1 2 3 4 5 6 7 8 9 10 11 12 Signal B0 B1 B2 B3 GND VCC3V3 HS VS NC NC GND VCC3V3 Description Blue 0 Blue 1 Blue 2 Blue 3 Power Supply Ground Positive Supply Ground Horizontal Sync Vertical Sync Not Connected Not Connected Power Supply Ground Positive Power Supply Table 1. Pmod header J2. 1.1 Physical Dimensions The pins on the pin header are spaced 100 mil apart. The PCB is 1.7 inches (4.3 cm) long on the sides parallel to the pins on the pin header and 1.7 inches (4.
PAGE 3
Pmod VGA Reference Manual Color CRT displays use three electron beams (one for red, one for blue, and one for green) to energize the phosphor that coats the inner side of the display end of a cathode ray tube (see Fig. 1). Electron beams emanate from “electron guns,” which are finely-pointed heated cathodes placed in close proximity to a positively charged annular plate called a “grid.
PAGE 4
Pmod VGA Reference Manual Video data typically comes from a video refresh memory with one or more bytes assigned to each pixel location (the Pmod VGA uses 12 bits per pixel). The controller must index into video memory as the beams move across the display, and retrieve and apply video data to the display at precisely the time the electron beam is moving across a given pixel.
PAGE 5
Pmod VGA Reference Manual A VGA controller circuit, such as the one diagrammed in Fig. 4, decodes the output of a horizontal-sync counter driven by the pixel clock to generate HS signal timings. You can use this counter to locate any pixel location on a given row. Likewise, the output of a vertical-sync counter that increments with each HS pulse can be used to generate VS signal timings, and you can use this counter to locate any given row.