Altera MAX II - Manual (Page 28)

2–20 Development Kit Version 1.1.0 Altera Corporation
MAX II Development Kit Getting Started User Guide July 2005
Reference Designs
Note that LED8 remains lit. If this LED is off while the PC
application is idle, an error has occurred. Close the port,
reset the board by pressing S1, and re-open the port. If the
PC application stops responding, disconnect the USB cable
from the board. If that doesn’t solve the problem, you will
have to use the Task Manager in Windows to end the PC
application manually.
7. Using the demo:
Perform the following tests on the USB Reference Design user
interface (see
Figure 2–6 ).
a. Check the LEDs—Click on the LEDs and note that they turn on
and off on the board as they do in the GUI.
b. Write to the LCD—Type some text into the Liquid Crystal
Display text box and click Write to LCD. The same text appears
in the LCD display on the board.
c. Write to the SRAM—First use Notepad to create a text file and
Save
the file on your hard drive. In the USB_Utility GUI, click
the Browse button near the SRAM Interface. Browse to the file
you just created. Make sure the default encoding list box says
“ASCII” and click Write to SRAM.
d. Read from the SRAM—First check that the Default Encoding list
box says “ASCII” and then click Read SRAM. Make sure the
SRAM contents text box shows the data that you typed into
your Notepad file. Note that when you read from the SRAM, a
file called SRAMDataBack.txt is created in the same directory
where the USB_Utility.exe file resides. This file is re-created
each time you read from the SRAM. It contains the addresses
and the data read from those addresses.
1
SRAMDataBack.txt must not be open when you try to read
from the SRAM.