Altera Cyclone III LS FPGA Development Board Manual do Utilizador descarregar pdf (Página 31)

Chapter 2: Board Components 2–23

General User Input/Output

Table 2–21 lists the clock outputs for the Cyclone III LS FPGA development board.

Table 2–22 lists the crystal oscillators component references and manufacturing

information.

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 development board includes five user-defined push-button switches: four general

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

reset push-button switches, refer to

“Configuration Push-button Switches” on

page 2–20.

Board references S3 through S6 are push-button switches that allow you to interact

with the Cyclone III LS 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.

The board reference S2 is the CPU reset push-button switch, CPU_RESETn, which is

an input to the Cyclone III LS 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 III LS device. This switch also acts as a regular I/O pin.

Table 2–21. Cyclone III LS FPGA Development Board Clock Outputs

Connector

Schematic Signal

Name

Cyclone III LS

Device Pin

Number I/O Standard Description

SMA (J15) CLKOUT_SMA AC15 2.5-V FPGA CMOS output or GPIO

Samtec HSMC HSMA_CLKOUT0 P28 2.5-V FPGA CMOS output or GPIO

Samtec HSMC HSMA_CLKOUT_P1 V28 LVDS or 2.5-V LVDS output or two 2.5-V CMOS outputs.

HSMA_CLKOUT_N1 U28

Samtec HSMC HSMA_CLKOUT_P2 M25 LVDS or 2.5-V LVDS output or two 2.5-V CMOS outputs.

HSMA_CLKOUT_N2 N26

Samtec HSMC HSMB_CLKOUT0 D2 2.5-V FPGA CMOS output or GPIO

Samtec HSMC HSMB_CLKOUT_P2 T6 LVDS or 2.5-V LVDS output or two 2.5-V CMOS outputs.

HSMB_CLKOUT_N2 T5

Table 2–22. Crystal Oscillator Component References and Manufacturing Information

Board

Reference Description Manufacturer

Manufacturer

Part Number Manufacturer Website

X3 66.6 MHz Crystal Oscillator ECS Inc. ECS-3953C-666-X www.ecsxtal.com

U17 Single Output Programmable

Clock Generator

Texas Instruments CDCM61001RHB www.ti.com

X5 50.00 MHz Crystal Oscillator ECS Inc. ECS-3525-500-B-xx www.ecsxtal.com

Y3 100.00 MHz Crystal Oscillator Pletronics SM5545TEX-100.00M www.pletronics.com

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