Specifications

Chapter 2: Board Components 2–3
Board Overview
© March 2009 Altera Corporation Cyclone III 3C120 Development Board Reference Manual
J5 Header Speaker header.
D1, D3, D4 Ethernet PHY LEDs Green Ethernet PHY LEDs. Illuminate when Ethernet PHY is using the
10/100/1000 Mbps (D1, D3, D4) connection speeds.
D6 Duplex Ethernet PHY
LED
Green Ethernet PHY LED. Illuminates when Ethernet PHY is both sending and
receiving data.
D5 Power LED Blue LED indicates when power is applied to the board.
D7, D8 Ethernet PHY
transmit/receive activity
LEDs
Green LED. Illuminates when transmit/receive data is active from the Ethernet
PHY.
SW1 MAX II device control
DIP switch
Controls various features specific to the Cyclone III development board.
SW3 JTAG control switch JTAG control DIP switch used to remove or include devices in the active JTAG
chain.
D17 SRAM active SRAM active LED. Illuminates when the SRAM device is accessed.
D23 Flash active Flash active LED. Illuminates when the flash device is accessed.
U28 Power display Displays power measured by the MAX II CPLD.
D16 DDR2 LED Indicates that the DDR2 top devices are active.
D11 DDR2 LED Indicates that the DDR2 bottom devices are active.
Clock Circuitry
Y4 125 MHz 125-MHz clock oscillator used for the system clock.
Y5 50 MHz 50-MHz clock oscillator used for data processing.
Y1 24-MHz crystal Cypress USB PHY.
Y2 6-MHz crystal USB PHY FTDI reference clock.
Y3 24 MHz MAX II device clock.
J10 SMA clock input SMA connector that allows the provision of an external clock input.
J11 SMA clock output SMA connector that allows the provision of an external clock output.
General User Input and Output
S1 through S4 User push buttons Four 1.8-V push-button switches for user-defined, logic inputs.
S5 CPU reset push button One 1.8-V push-button switch for FPGA logic and CPU reset.
S6 and S7 Reset and factory
configuration push
buttons
Two 1.8-V push-button switches that control FPGA configuration from flash
memory.
D26 through D33 User LEDs Eight user-defined LEDs.
SW5 PGM CONFIG SELECT Rotary switch to select which FPGA configuration file to use in flash memory.
SW4 Power select rotary
switch
Power rail select for on-board power monitor.
U30 User display User-defined, green 7-segment display.
J4 Character LCD 14-pin LCD display.
J13 Graphics LCD 30-position dot matrix graphics LCD display.
Memory
U31 Flash 64 MB of flash memory with a 16-bit data bus.
Table 2–1. Cyclone III Development Board (Part 2 of 3)
Board Reference Type Description