Altera Cyclone III FPGA Starter Board - Manual (Page 16)

2–8 Altera Corporation
Cyclone III FPGA Starter Board Reference Manual April 2012
Interfaces
Interfaces This section describes the following Cyclone III FPGA starter board’s
interface blocks:
■ USB interface
■ HSMC expansion connector
■ General user interfaces
USB Interface
The USB-Blaster circuitry is built onto the board. Plug the USB cable
(provided with the kit) into USB connector J3 on the board and the other
end to a USB port on your computer to program and communicate with
the Cyclone III device via the JTAG port.
A USB physical connection is used to enable computers to communicate
with the starter board. To simplify the USB interface, the board contains a
FTDI FT245 FIFO circuit. The data from the FTDI chip is translated into a
JTAG stream using the Altera EMP3128A CPLD connected to the Cyclone
III device’s dedicated JTAG port.
The 5 V supply for the FTDI device is drawn from the USB connection.
The rest of the circuit operates on 3.3 V supply with a maximum of
100 mA and 1.8 V supply with a maximum of 900 mA voltage.
JP5 3.3 V supply for the MAX device and HSMC. To supply an
external voltage, remove the jumper and connect the external
supply to pin 2. (Pin 2 has a rounded shape on the bottom of the
board.)
JP6 Sense resistor for measuring the power consumed by the 1.2 V
V
CCINT
supply to the Cyclone III device.
JP7 1.8 V power supply to flash device. To supply an external
voltage, remove the jumper and connect the external supply to
pin 2. (Pin 2 has a rounded shape on the bottom of the board.)
JP8 Removing the shunt enables the embedded USB-Blaster
circuitry. When the shunt is in place, use any external cable such
as the ByteBlaster II, EthernetBlaster, or USB-Blaster cable to
configure the Cyclone III device. (The board ships without the
JTAG header populated.)
Table 2–5. Board Jumpers (Part 2 of 2)
Jumper Board
Reference
Jumper Operational Descriptions