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 Overview
The Digilent FPGA board kits stocked by the Instrument Room contain the
following components:
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Digilab 2E System Board (D2E
Board) based on Xilinx Spartan 2E FPGA |
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Digilab IO1 Peripheral Board
(DIO1 Board) containing lots of LEDs, pushbuttons, and switches |
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Digilab Breadboard (DBB Board) |
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Power
supply |
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Parallel port cable |
Documentation
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Digilent, Inc. website, http://www.digilentinc.com/
-- Follow the "reference" tab, and look for manuals and schematics
pertaining to the boards listed above. Alternatively, you can follow
the "catalog" tab to select the board of interest, then click the
"more info" button. |
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Local
Guide -- This Word document assumes you are already familiar
with the Xilinx implementation tools, so only the essential new
information is
provided. |
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Using
Webpack ISE and Digilent FPGA Boards -- This Word document
discusses the essential differences from the existing documentation
for Foundation Series 4.2i software. |
UCF
Generators
These Excel spreadsheets greatly simply the creation of Xilinx user
constraint files, or UCF files, to specify the appropriate FPGA pin number
for a given Digilab circuit device.
TIP: Save the spreadsheet with your entered Verilog signal names
to make it easy to change your mind later on.
Guidelines for Breadboard Projects
Please take a great deal of care to ensure that you do not damage
our brand-new Digilent boards! The FPGA board is not easy to
repair! You must observe the following:
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Test and debug your circuit on
the DBB1 breadboard before you connect it to the D2E system
board. For example, use a 74HC4040 counter to create digital
stimulus when testing your circuit. |
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Use 400- to 500-ohm resistors
instead of wire to establish the connections between your analog
circuit and the connector socket leading to the
FPGA |
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Do not use the red
power bus on the DBB1 breadboard for any purpose, unless your
circuit uses a +3.3 VDC supply and does not require a large amount
of current. |
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You must connect your analog
circuit to the black ground bus, of course |
The D2E system board connectors A&B use the same FPGA pins as the
E&F connectors on the opposite side. This means you should use the
C&D connectors for either the DBB1 board or the DIO1 board.
Verilog
Modules
DigitDisplay
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Description:
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Accepts two 8-bit values
on input, and displays the hexadecimal representation of each
value on the Digilent DIO1 peripheral
board |
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Uses multiplexed display
scheme with 100 Hz refresh to minimize
flicker | |
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Connection requirements:
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50MHz master clock |
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Active-high master reset
(all segments active on reset) |
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All 12 lines of the
four-digit seven-segment display | |
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Synthesizable module: digit_display.v |
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Testbench for synthesizable
module: digit_display_TB.v |
DigitDisplay_Demo
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Description:
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Demonstrates operation
of the "DigitDisplay" module on the DIO1 board and D2E board |
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Displays the value of
two 8-bit counters (one counts up, the other counts down) that
start at intermediate values on reset |
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Press the DIO1
"Pushbutton 1" to
reset | |
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Synthesizable module: digit_display_demo.v |
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UCF for synthesizable module:
digit_display_demo.ucf |
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Bitstream file (must connect
DIO1 Connector B only to D2E Connector C): digit_display_demo.bit |
LED7_Display
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Description:
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Permits individual
control over the display of each segment on the four-digit
seven-segment LED display |
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Accepts four 8-bit input
values, where the most significant bit corresponds to the
decimal point, and the remaining seven bits correspond to the
segments "a" through "g". For example, the value 8'b10010101
will activate the decimal point and segments "c", "e" and "g". |
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A "1" lights the
segment, and a "0" turns it off. |
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Uses multiplexed display
scheme with 100 Hz refresh to minimize
flicker | |
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Connection requirements:
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50MHz master clock |
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Active-high master reset
(all segments active on reset) |
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All 12 lines of the
four-digit seven-segment display | |
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Synthesizable module: LED7_display.v |
LED7_Display_Demo
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Description:
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Demonstrates operation
of the "LED7_Display" module on the DIO1 board and D2E board |
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Rotates eight asserted
bits through all 40 LED devices (4x8=32 seven-segment display
segments, and 8 discrete LEDs) |
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Press the DIO1
"Pushbutton 1" to reset (all LEDs light) | |
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Synthesizable module: LED7_display_demo.v |
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UCF for synthesizable module:
LED7_display_demo.ucf |
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Bitstream file (must connect
DIO1 Connector B only to D2E Connector C): LED7_display_demo.bit | |
