Nexys 3™ FPGA Board Reference Manual
Copyright Digilent, Inc. All rights reserved.
Other product and company names mentioned may be trademarks of their respective owners.
Page
21
of
22
Spartan 6
8
PmodA
8
8
8
PmodB
PmodC
PmodD
Bank2
Bank3
Bank3
Bank0*
signals are not matched pairs, and they are routed using best-available tracks without impedance control or delay
matching.
Digilent produces a large collection of Pmod accessory boards that can attach to the Pmod and VHDC expansion
connectors to add ready-made functions like A/D's, D/A's, motor drivers, sensors, cameras and other functions.
See
www.digilentinc.com
for more information.
11 Built-In Self Test
A demonstration configuration is loaded into the BPI PCM device on the Nexys 3 board during manufacturing. This
demo bit file is available for download from the Digilent website. If the demo configuration is present in the BPI
PCM device and the Nexys 3 board is powered on in BPI mode, a simple demo project will allow basic hardware
verification. The demo drives a counter on the 7-segment display, drives the user LEDs on and off when the user
switches are toggled, turns off digits on the 7-segment display when user buttons are pressed, and drives an image
out the VGA port. A USB mouse can be connected to J4 for a simple visual demonstration.
If the demo configuration is not present in the BPI device, it can be downloaded from the Digilent website and
programmed directly into the FPGA or reloaded into the PCM device using the Adept programming software. The
same basic functionality is also available using the automated Test tab in the Adept application. Using the Test tab
automatically loads a demo configuration into the FPGA, so no separate bit files or project need to be used.
All Nexys 3 boards are 100% tested during the manufacturing process. If any device on the Nexys 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. If a
Pin 1
Pin 12
Pin 6
8 signals
VCC GND
Pmod Connectors
– front
view as loaded on PCB
Pmod Pinouts
JA1: T12
JB1: K2
JC1: H3
JD1: G11
JA2: V12
JB2: K1
JC2: L7
JD2: F10
JA3: N10
JB3: L4
JC3: K6
JD3: F11
JA4: P11
JB4: L3
JC4: G3
JD4: E11
JA7: M10
JB7: J3
JC7: G1
JD7: D12
JA8: N9
JB8: J1
JC8: J7
JD8: C12
JA9: U11
JB9: K3
JC9: J6
JD9: F12
JA10: V11
JB10: K5
JC10: F2
JD10: E12
