Digilent Nexys2 Panduan Referensi - Halaman 17

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Digilent

Nexys2 Reference Manual

www.digilentinc.com

Built in Self Test

A demonstration configuration is loaded into the Platform Flash ROM on the Nexys2 board during

manufacturing. This demo, also available on the resource CD and on the Digilent website, can serve

as a board verification test since it interacts with all devices and ports on the board. To configure the

FPGA from a bit file stored in Platform Flash, set the Mode Jumper to Slave Serial and cycle power or

press the FPGA reset button.

The self-test checks the on-board memories, and then connects the switches to the LEDs, the buttons

and PS/2 keyboard (if attached) to the seven-segment display, and a VGA monitor (if attached) will

show a color pattern. If the on-board memories pass test, "PASS" will be displayed on the seven-

segment display (otherwise, "FAIL"). After the memory test, the buttons and switches will drive the

LEDs and seven-segment display, so that all user I/O devices can be manually checked.

If the self test is not resident in the Platform Flash ROM, it can be programmed into the FPGA or

reloaded into the ROM using the Adept programming software.

All Nexys2 boards are 100% tested during the manufacturing process. If any device on the Nexys2

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, or 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. If a board fails test outside of the

warranty period and cannot be easily repaired, Digilent can repair the board or offer a discounted

replacement. Contact Digilent for more details.

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