P0528 Terasic Technologies Inc, P0528 Datasheet - Page 28

• Manufacturer Part Number: P0528
• Description: BOARD DEV DE1 ALTERA
• Manufacturer: Terasic Technologies Inc
• Type: FPGAr

Specifications of P0528

• Contents: DE1 Board, Power Supply, USB Cable, Plastic cover and software
• For Use With/related Products: Cyclone II 2C20
• For Use With: P0033 - BOARD ADAPTER HSMC TO GPIOP0006 - BOARD ADAPTER THDB-SUMP0001 - MODULE DIGITAL CAMERA 5MP (D5M)P0307 - KIT DEV 4.3" LCD TOUCH PANEL
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: DE1

In addition to its use for JTAG and AS programming, the USB Blaster port on the DE1 board can
also be used to control some of the board's features remotely from a host computer. Details that
describe this method of using the USB Blaster port are given in Chapter 3.
4.2 Using the LEDs and Switches
The DE1 board provides four pushbutton switches. Each of these switches is debounced using a
Schmitt Trigger circuit, as indicated in Figure 4.3. The four outputs called KEY0, …, KEY3 of the
Schmitt Trigger device are connected directly to the Cyclone II FPGA. Each switch provides a high
logic level (3.3 volts) when it is not pressed, and provides a low logic level (0 volts) when
depressed. Since the pushbutton switches are debounced, they are appropriate for use as clock or
reset inputs in a circuit.
There are also
and are intended for use as level-sensitive data inputs to a circuit. Each switch is connected directly
to a pin on the Cyclone II FPGA. When a switch is in the DOWN position (closest to the edge of
the board) it provides a low logic level (0 volts) to the FPGA, and when the switch is in the UP
position it provides a high logic level (3.3 volts).
Quartus II
Programmer
AS Mode
10
toggle switches (sliders) on the DE1 board. These switches are not debounced,
USB
USB Blaster Circuit
Figure 4.2. The AS configuration scheme.
MAX
3128
Figure 4.3. Switch debouncing.
RUN/PROG
"PROG"
EPCS4
Serial
Configuration
Device
26
AS Mode
Config
Auto
Power-on Config
JTAG Config Port
FPGA
DE1 User Manual