Altera Arria II GX FPGA Development Board - Manual (Page 32)

2–24 Chapter 2: Board Components
General User Input/Output
Arria II GX FPGA Development Board Reference Manual February 2011 Altera Corporation
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 three user-defined push-button switches—two
general user push-button switches and one CPU reset switch. For information on the
system and safe reset push-button switches, refer to
“Reset Configuration Push-
button Switches” on page 2–20 .
Board references PB1 and PB2 are push-button switches that allow you to interact
with the Arria II GX device. When you press and hold the switch, the device pin is set
to logic 0; when you release the switch, 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 2–23 lists the user-defined push-button switch schematic signal names and their
corresponding Arria II GX device pin numbers.
Table 2–22. 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 2–23. 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