Specifications

2–26 Chapter 2: Board Components
General User Interfaces
Cyclone III 3C120 Development Board Reference Manual © March 2009 Altera Corporation
General User Interfaces
To allow you to fully leverage the I/O capabilities of the Cyclone III device for
debugging, control, and monitoring purposes, the following general user interfaces
are available on the board:
■ Push buttons
■ DIP switches
■ LEDs
■ 7-segment displays
■ LCD displays
User-Defined Push Button Switches
The development board includes four general user, one user reset, one system reset,
and one factory push button switch.
f For information on the system reset and factory push button switches, refer to
“System Reset and Configuration Switches” on page 2–20.
Board references S1 through S4 are push button switches allowing general user I/O
interfaces to the Cyclone III device. There is no board-specific function for these four
push buttons.
Board reference S5 is the user reset push button switch, CPU_RESETn, which is an
input to the Cyclone III device and MAX II CPLD. It is intended to be the master reset
signal for the FPGA design loaded into the Cyclone III device. This connects to the
special function pin called the DEV_CLR on the FPGA, but it also is a regular I/O pin.
The MAX II device uses the DEV_CLR pin as its reset along with the RESET_CONFIGn
push button.
Ta bl e 2–23 lists the schematic signal name and corresponding Cyclone III pin number.
Ta bl e 2–24 lists the push button switch component reference and manufacturing
information.
Table 2–23. Push Button Switch Signal Name and Function
Board Reference
Schematic Signal
Name
Cyclone III Device
Pin Number
MAX II Device
Pin Number
S1 USER_PB3 AA12 —
S2 USER_PB2 AH3 —
S3 USER_PB1 AC12 —
S4 USER_PB0 AD7 —
S5 CPU_RESETn T21 M9
Table 2–24. Push Button Switch Component Reference and Manufacturing Information
Board Reference Description Manufacturer
Manufacturing
Part Number
Manufacturer
Website
S1 through S5 Push button switch Panasonic EVQPAC07K www.panasonic.com