Datasheet

Basys 3™ FPGA Board Reference Manual

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Page 19 of 19

10 Built-In Self-Test

A demonstration configuration is loaded into the SPI Flash device on the Basys 3 board during manufacturing. The

source code and prebuilt bitstream for this design are available for download from the Digilent website. If the

demo configuration is present in the SPI Flash device and the Basys 3 board is powered on in SPI mode, the demo

project will allow basic hardware verification. Here is an overview of how this demo drives the different onboard

components:

 The user LEDs are illuminated when the corresponding user switch is placed in the on position.

 The VGA port displays feedback from a USB Mouse.

 Connecting a mouse to the USB-HID Mouse port will allow the pointer on the VGA display to be

controlled.

 On power-up, each digit of the seven-segment display will display a counter output from 0-9 that

increments once a second.

 Pressing BTNU, BTNL, BTNR, or BTND will cause a digit of the seven-segment display to go blank.

 Pressing BTNC will reset the design.

 On power-up, a welcome message is sent over the UART. Also, every time a button is pressed a message

is sent. The UART can be connected to using a terminal program with 9600 Baud, 8 data bits, 1 stop bit,

and no parity.

All Basys 3 boards are 100% tested during the manufacturing process. If any device on the Basys 3 board fails

test or is not responding properly, it is likely that damage occurred during transport or during use. Typical

damage includes stressed solder joints and contaminants in switches and buttons resulting in intermittent

failures. Stressed solder joints can be repaired by reheating and reflowing solder and contaminants can be

cleaned with off-the-shelf electronics cleaning products. If a board fails test within the warranty period, it will

be replaced at no cost. Contact Digilent for more details.