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Revision: November 9, 2006 215 E Main Suite D | Pullman, WA 99163

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P16

Spartan 3

FPGA

RED

GRN

BLU

512

P15

N15

512

J16

K16

K15

L15

512

M16

M15

N16

P16

200

Nexys VGA Module

Block Diagram

Overview

The Digilent Nexys VGA Module provides a 12bit VGA

interface for use with the Digilent Nexys board. The 12

bit interface allows up to 4096 colors displayed on a

standard VGA Monitor.

The Nexys VGA Module interfaces with the Nexys board

via the 16 pin header at J8 and connects to a VGA

monitor using a standard 15 pin VGA cable.

Functional Description

VGA Port

The five standard VGA signals Red, Green, Blue,

Horizontal Sync (HS), and Vertical Sync (VS) are routed

directly from the FPGA to the VGA connector. There are

four signals routed from the FPGA for each of the

standard VGA color signals resulting in a video system

that can produce 4,096 colors. Each of these signals

has a series resistor that when combined in the circuit,

form a divider with the 75-ohm termination resistance of

the VGA display. These simple circuits ensure that the

video signals cannot exceed the VGA-specified

maximum voltage, and result in color signals that are

either fully on (.7V), fully off (0V) or somewhere in

between.

VGA signal timings are specified, published, copyrighted and sold by the VESA organization

(www.vesa.org). The following VGA system timing information is provided as an example of how a

1 2 3 4

Inhaltsverzeichnis

Seite 1 - VGA Port

DDiiggiilleenntt NNXXVVGGAA RReeffeerreennccee MMaannuuaall ®www.digilentinc.com Revision: November 9, 2006 215 E Main Suite D | Pullman, WA 9916

Seite 2 - Display System

Digilent Basys Reference Manual www.digilentinc.com Copyright Digilent, Inc. Page 2/4 Doc: 502-107 Cathode Ra

Seite 3 - VGA display

Digilent Basys Reference Manual www.digilentinc.com Copyright Digilent, Inc. Page 3/4 Doc: 502-107 Currentth

Seite 4 - Basys Reference Manual

Digilent Basys Reference Manual www.digilentinc.com Copyright Digilent, Inc. Page 4/4 Doc: 502-107 A VGA cont

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