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Revision: August 11, 2004 215 E Main Suite D | Pullman, WA 99163

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Overview

The DIO4 circuit board provides a low-cost,

ready-made source for many of the most

common I/O devices found in digital systems. It

can be attached to a Digilent system board to

create a circuit design platform capable of

hosting a wide array of circuits. DIO4 features

include:

• A 4-digit seven segment LED display;

• 8 individual LEDs;

• 4 pushbuttons;

• 8 slide switches;

• 3-bit VGA port;

• PS/2 mouse or keyboard port.

Functional Description

The DIO4 can be attached to Digilent system

boards to quickly and easily add several useful

I/O devices. The DIO4 draws power from the

system board, and signals from all I/O devices

are routed to individual pins on the system

board connectors. These features allow the

DIO4 to be incorporated into system-board

circuits with minimal effort.

All devices on the DIO4 use the 3.3V supply

from the system board, except for the PS/2

port which needs a 5VDC supply (the DIO4

contains a 5VDC regulator). Signals coming

from the PS/2 port are routed through level-

shifting buffers to protect system boards that

do not have 5V tolerant inputs.

Power Supplies

The DIO4 draws power from three pins on the

40-pin connectors: pin 37 supplies 3.3V; pin 39

provides system GND, and pin 40 supplies

unregulated voltage (VU). VU is connected to a

5VDC LDO regulator to produce a 5VDC supply

for the PS/2 interface. The 3.3V supply is used to

drive all other I/O devices on the board. The

DIO4 consumes 5-10mA from the VU supply,

and 10-50mA from the 3.3V supply (depending

on how many LEDs are illuminated).

Seven-Segment LED display

The DIO4 board contains a modular 4-digit,

common anode seven-segment LED display. In

a common anode display, the seven anodes of

the LEDs forming each digit are connected to

four common circuit nodes (labeled AN1 through

AN4 on the DIO4). Each anode, and therefore

each digit, can be independently turned on and

off by driving these signals to a ‘0’ (on) or a ‘1’

(off). The cathodes of similar segments on all

four displays are also connected together into

seven common circuit nodes labeled CA through

CG. Thus, each cathode for all four displays can

be turned on (‘0’) and off (‘1’) independently.

Connector P2Connector P1

8 switches

4 buttons

8 LEDs

4 7-seg.

displays

PS2

Port

VGA

Port

Latch Debounce Buffer

DIO4 circuit board block diagram

1 2 3 4 5 6 7 8 9

Inhaltsverzeichnis

Seite 1 - Doc: 500-227 page 1 of 9

DDiiggiilleenntt DDIIOO44™™ PPeerriipphheerraall BBooaarrdd RReeffeerreennccee MMaannuuaall ®www.digilentinc.com Revision: August 11, 2004 215

Seite 2 - Cathodes

DIO4 Reference Manual Digilent, Inc. www.digilentinc.com Page 2 This connection scheme creates a multiplexed display, where driving the anode si

Seite 3 - Pin 5Pin 6

DIO4 Reference Manual Digilent, Inc. www.digilentinc.com Page 3 Discrete LEDs Eight individual LEDs are provided for circuit outputs. The LED c

Seite 4

DIO4 Reference Manual Digilent, Inc. www.digilentinc.com Page 4 TCKTSUEdge 0Edge 10CLKDATATHLDTCK'1' stop bit'0' start bit

Seite 5

DIO4 Reference Manual Digilent, Inc. www.digilentinc.com Page 5 1 6112 7123 8134 91451015GNDVGA "DB15" ConnectorR270GB270270HSVSThe

Seite 6 - R,G,B signals (to guns)

DIO4 Reference Manual Digilent, Inc. www.digilentinc.com Page 6 timing information is provided as an example of how a VGA monitor might be drive

Seite 7 - VGA display

DIO4 Reference Manual Digilent, Inc. www.digilentinc.com Page 7 Information is only displayed when the beam is moving in the “forward” direction

Seite 8

DIO4 Reference Manual Digilent, Inc. www.digilentinc.com Page 8 the frequency at which all information on the display is redrawn. The minimum re

Seite 9

DIO4 Reference Manual Digilent, Inc. www.digilentinc.com Page 9 DIO4 Expansion Connector Pinout P1 Signal Dir P2 Signal Di

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Digilent DIO4 Bedienungsanleitung

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