Digital Signal Processing Reference
In-Depth Information
After attaching the USB cable, press in the DE1's red power switch located on
the upper left edge of the board below the USB connector to turn on the board.
When properly powered, the blue power LED on the DE1 board near the
power switch should light up and the other LEDs will all flash, if it is still
setup to run the default demo design shipped from the factory.
Preparing for Downloading
Make sure that you have assigned the correct
Device Name
for the DE1. The
DE1 contains a
EP2C20F484C7
Cyclone II FGPA. When you change the
device type you will also need to redo the pin assignments. Make sure that you
have also assigned the correct pin numbers for the DE1 board. PB1 is pin
R22
,
PB2 is pin
R21
and the LED is pin
U22
. (refer to section 1.1 for help)
Whenever you change the Device or pin assignments, it is necessary to
recompile before downloading.
After checking to make sure that the cables are hooked up properly, you are
ready to download the compiled circuit to the DE1 board. Select
Tools
Programmer
. Click on
Hardware Setup
, select the proper hardware,
a
USB-Blaster
. (If a window comes up that displays, "
No Hardware"
to the
right of the Hardware Setup button, use the Hardware Setup button to change
currently selected hardware from "
No Hardware"
to "
USB-Blaster"
. If a red
JTAG error message appears or the start button is not working, close down the
Programmer window and reopen it. If this still doesn't correct the problem,
then there is something else wrong with the setup or cable connection. Go back
to the beginning of this section and check each step and connection carefully.)
Final Steps to Download
The filename orgate.sof should be displayed in the programmer window. The
*.sof file contains the FPGA's configuration (programming) data for your
design. To the right of the filename in the Program/Configure column, check
the
Program/Configure
box. To start downloading your design to the board,
click on the
Start
button. Just a few seconds are required to download. If
download is successful, a green info message displays in the system window
notifying you the programming was successful.
Testing Your Design
On the DE1 board, the right two pushbuttons are used in the design and one of
the LEDs to the right just above them. The locations of PB1 (Key0), PB2
(Key1), and the LED (LEDG0) are in the lower right corner of the board as
seen in Figure 1.13. After downloading your program to the DE1 board, the
LED in the lower right corner should turn off whenever a pushbutton is hit.
Since the output of the OR gate is driving the LED signal, it should be on
when no pushbuttons are hit. Since the buttons are active low, and the
BNOR2
gate also has active low inputs and output, hitting either button should turn off
the LED.
