Altera Cyclone II EP2C35 PCI Development Board Manual do Utilizador descarregar pdf (Página 23)

Altera Corporation Core Version 4.0.0 2–13

May 2005 Cyclone II EP2C35 PCI Development Board Reference Manual

Board Components & Interfaces

Push-Button Switches

Table 2–15 describes the board’s push-button switches.

Figure 2–3 shows the board’s push-button switch circuitry.

Figure 2–3. Board Push-Button Switches

Table 2–15. Push-Button Switches

Board

Reference

Designator

Description

RECONFIG S2 Causes Cyclone II device to reload configuration

RESET S3 User-defined hardware reset.

PB0 S1 User-defined. These switches are momentary-contact, push-button switches that

provide stimulus to designs in the Cyclone II device. Each switch is connected to

a Cyclone II general purpose I/O pin with a pull-up resistor. When a switch is

pressed, the Cyclone II device pin will detect a logic 0; when the switch is not

pressed, the Cyclone II device pin will detect a logic 1. The push-button switches

are tied high with a pull-up resistor.

PB1 S5

3.3 V

RECONFIG

RESETn

USER PB1n

USER PB0n

R35

10K Ω resistors

R40

R33

R34

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