Altera Arria II GX FPGA Development Board, 6G Edition - Manual (Page 31)

Chapter 2: Board Components 2–23
General User Input/Output
© July 2010 Altera Corporation Arria II GX FPGA Development Board, 6G Edition Reference Manual
Table 2–21 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 three user-defined push-button switches: two
general user push-button switches and one CPU reset. For information on the system
and safe reset push-button switches, refer to
“Reset Configuration Push-button
Switches” on page 2–19 .
Board references PB1 and PB2 are push-button switches that allow you to interact
with the Arria II 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.
The board reference PB3 is the CPU reset push-button switch, CPU_RESET, which is
an input to the Arria II GX device. CPU_RESET is intended to be the master reset
signal for the FPGA design loaded into the Arria II GX device. It also acts as a regular
I/O pin.
Table 2–22 lists the user-defined push-button switch schematic signal names and their
corresponding Arria II GX device pin numbers.
Table 2–21. Crystal Oscillator Component References and Manufacturing Information
Board
Reference Description Manufacturer
Manufacturer
Part Number Manufacturer Website
U25 156.25 MHz LVPECL Saw
Oscillator Epson EG-2102CA
155.5200M-DGPA www.eea.epson.com
U26 Quad Output Programmable
Clock Generator Texas Instruments CDCM61004RHBR www.ti.com
U30 Single Output Programmable
Clock Generator Texas Instruments CDCM61001RHBR www.ti.com
Y6 100 MHz Crystal Oscillator Mercury Electronics 3H53-AT-100.000 www.mecxtal.com
Y5 50 MHz Crystal Oscillator Epson XG-1000CB
50.0000M-DCL3 www.eea.epson.com
Table 2–22. User-defined Push-button Switch Schematic Signal Names and Functions
Board Reference Description
Schematic Signal
Name I/O Standard
Arria II GX Device
Pin Number
PB2
User-defined push-button switch
USER_PB0
1.8-V
AK9
PB1 USER_PB1 AL7
PB3 CPU_RESET 2.5-V N10