Altera Cyclone IV GX Transceiver Starter Board Manual do Utilizador descarregar pdf (Página 25)

Chapter 2: Board Components 2–17

General User Input/Output

This section describes the user I/O interface to the FPGA, including the push-buttons,

DIP switches, status LEDs, and character LCD.

User-Defined Push-Button Switches

The starter board includes three user-defined push-button switches: two general user

and one CPU reset push-button switches . For information on the system and safe

reset push-button switches, refer to

“Configuration Push-Button Switches” on

page 2–15.

Board references S5 and S6 are push-button switches that allow you to interact with

the Cyclone IV GX device. When the switch is pressed and held down, the device pin

is set to logic 0; when the switch is released, the device pin is set to logic 1. There is no

board-specific function for these general user push-button switches.

Board reference S4 is the CPU reset push-button switch, CPU_RESETn, which is an

input to the Cyclone IV GX device and the MAX II CPLD EPM2210 System Controller.

CPU_RESETn is intended to be the master reset signal for the FPGA design loaded

into the Cyclone IV GX device. This switch also acts as a regular I/O pin.

Table 2–17 lists the user-defined push-button switch schematic signal names and their

corresponding Cyclone IV GX device pin numbers.

Table 2–18 lists the user-defined push-button switch component reference and the

manufacturing information.

User-Defined LEDs

The starter board includes four general purpose LEDs. This section describes all

user-defined LEDs. For information on board-specific or status LEDs, refer to

“Status

Elements” on page 2–13.

Board references D5 through D8 are four user-defined LEDs which allow status and

debugging signals to be driven to the LEDs from the FPGA designs loaded into the

Cyclone IV GX device. The LEDs illuminate when a logic 0 is driven, and turns off

when a logic 1 is driven. There is no board-specific function for these LEDs.

Table 2–19 lists the user-defined LED schematic signal names and their corresponding

Cyclone IV GX pin numbers.

Table 2–17. User-Defined Push-Button Switch Schematic Signal Names and Functions

Board Reference Description

Schematic Signal

Name I/O Standard

Cyclone IV GX

Device Pin Number

S6 User-defined push-button switch.

When the switch is pressed, a logic 0

is selected. When the switch is

released, a logic 1 is selected.

USER_PB0

2.5-V

H13

S5 USER_PB1 G13

S4 CPU_RESETn D10

Table 2–18. User-Defined Push-Button Switch Component Reference and Manufacturing Information

Board Reference Description Manufacturer

Manufacturer

Part Number Manufacturer Website

S4 to S6 Push-button switches Panasonic EVQPAC07K www.panasonic.com/industrial/

1 2 ... 20 21 22 23 24 25 26 27 28 29 30 ... 39 40

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