Servo - September 2011

FIGURE 25.

FIGURE 26.

LED0 should come on following the AND logic function that was placed into the FPGA.

We really haven’t taken any time to explain VHDL during this article. If you want a good concise VHDL tutorial search for The Low-Carb VHDL Tutorial by Bryan Mealy on the Internet.

Next Time

bottom of the screen explaining what the problems are. If all goes well, you can now generate the necessary bit file that can be downloaded into the FPGA or PROM chip. Click on Generate Programming File and then Run, as shown in Figure 23. We now need to leave the Xilinx ISE Design Suite to get this bit file into the FPGA.

With your Basys2 unit plugged into a USB port and turned on, open the Digilent Adept program. The program should automatically recognize your Basys2 unit. At this point, it should be noted that there is a demonstration program already loaded into the PROM chip of the Basys2 board when you get it. It allows you to move the slide switches, turn on LEDs, and press the pushbuttons to turn off the seven-segment displays while they count up. If you load your AND gate into the PROM, you will overwrite this demonstration program and lose it. The program is available from the Basys2 web page if you want to download another copy; look for Basys2_100userdemocclk.bit.

If you load your AND gate bit file into the FPGA itself, it will run, but on powering down and up again the demo program will be loaded back into the FPGA. Click on the Browse button to the right of the FPGA drop down window (see

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