General user input/output, User-defined push buttons, General user input/output –26 – Altera Stratix IV GX FPGA Development Board User Manual

Page 34: User-defined push buttons –26

2–26

Chapter 2: Board Components

General User Input/Output

Stratix IV GX FPGA Development Board

August 2012

Altera Corporation

Reference Manual

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 Buttons

The development board includes four user-defined push buttons—three general and
one CPU reset. For information on the system and safe reset push buttons, refer to

“Reset Configuration Push Button” on page 2–20

Board references S3, S4, and S5 are push buttons that allow you to interact with the
Stratix IV GX device. When you press and hold down the push button, the device pin
is set to logic 0; when you release the push button, the device pin is set to logic 1.
There is no board-specific function for these general user push buttons.

Samtec HSMC

HSMB_CLK_OUT_P2

K10

LVDS or 2.5-V

LVDS output. Can also support two CMOS
outputs.

HSMB_CLK_OUT_N3

J10

Table 2–21. Stratix IV GX FPGA Development Board Clock Outputs (Part 2 of 2)

Connector

Schematic Signal Name

Pin

I/O Standard