Digilent DIO1 Manual do Utilizador descarregar pdf

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Revision: May 10, 2004 215 E Main Suite D | Pullman, WA 99163

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Overview

The Digital I/O board 1 (the DIO1) is one of

several expansion boards designed to mate with

Digilent system boards. The DIO1 is an

inexpensive board that contains an assortment

of basic digital I/O devices, including buttons,

switches, and several LED displays. The DIO1

board can be combined with Digilab system

boards to provide a source of ready-made I/O

devices, allowing a wide range of projects to be

implemented without the need for any other

components.

DIO1 board features include:

• A four digit seven-segment LED display;

• 8 individual LEDs;

• A 3-bit VGA port;

• 5 momentary pushbuttons;

• 8 slide switches;

• A PS2 mouse/keyboard port.

Functional description

The DIO1 board has been designed to provide a

basic, inexpensive platform that contains many

of the I/O devices commonly found in digital

systems. Unlike the more advanced DIO2

board, the DIO1 board has been designed so

that all signals pass directly to an attached

system board, so no intermediate logic is

required. When mated with a Digilab system

board, the DIO1 board can provide a flexible

prototyping system that can be operational

immediately.

LEDs

Eight LEDs are provided for circuit outputs.

The LED cathodes are tied to ground via 270-

ohm resistors, and the anodes are driven from

the 74HC373 (so the LED drive signals are

active high).

Figure 2. LED Circuit

Signals

All named signals used on the DIO1 board are

defined in the Table 1. Voltage levels for all

8 LEDs

4 displays 8 switches

PS2

port

Connector B

5 buttons

74HC373

Latch

Connector A

VGA Port

Figure 1. DIO1 schematic

LD signals

GND

LD1- LD8

RP1

270 Ohm

1 2 3 4 5 6 7 8 9 10

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DDiiggiilleenntt DDIIOO11 RReeffeerreennccee MMaannuuaall ®www.digilentinc.com Revision: May 10, 2004 215 E Main Suite D | Pullman, WA 99163 (509

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Digilent DIO1 Manual do Utilizador

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