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Digilent Basys2 Board Reference Manual
Revision: November 11, 2010 1300 Henley Court | Pullman, WA 99163 (509) 334 6306 Voice and Fax

Introduction The Basys2 board is a circuit design and implementation platform that anyone can use to gain experience building real digital circuits. Built around a Xilinx Spartan-3E Field Programmable Gate Array and a Atmel AT90USB2 USB controller, the Basys2board provides complete, ready-to-use hardware suitable for hosting circuits ranging from basic logic devices to complex controllers. A large collection of on-board I/O devices and all required FPGA support circuits are included, so countless designs can be created without the need for any other components.
Full Speed USB2 Port
(JTAG and data transfers)

Platform Flash
(config ROM)

SettableClock Source
(25 / 50 / 100 MHz)

20

Data port

JTAG port

Xilinx Spartan3E-100 CP132
32 2 8 bit color 4 4 4 4

JA
PS/2 Port VGA Port

JB

JC

JD

Pmod Connectors

I/O Devices

Four standard expansion connectors allow • 100,000-gate Xilinx Spartan 3E FPGA • Atmel AT90USB2 Full-speed USB2 port providing board power designs to grow beyond the Basys2 board andprogramming/data transfer interface using breadboards, user-designed circuit • Xilinx Platform Flash ROM to store FPGA configurations boards, or Pmods (Pmods are inexpensive • 8 LEDs, 4-digit 7-segment display, 4 buttons, 8 slide switches analog and digital I/O modules that offer A/D • PS/2 port and 8-bit VGA port nd & D/A conversion, motor drivers, sensor • User-settable clock (25/50/100MHz), plus socket for2 clock inputs, and many other features). Signals on • Four 6-pin header expansion connectors • ESD and short-circuit protection on all I/O signals. the 6-pin connectors are protected against ESD damage and short-circuits, ensuring a Figure 1. Basys2 board block diagram and features long operating life in any environment. The Basys2 board works seamlessly with all versions of the Xilinx ISE tools,including the free WebPack. It ships with a USB cable that provides power and a programming interface, so no other power supplies or programming cables are required. The Basys2 board can draw power and be programmed via its on-board USB2 port. Digilent’s freely available PC-based Adept software automatically detects the Basys2 board, provides a programming interface for the FPGA and PlatformFlash ROM, and allows user data transfers (see www.digilentinc.com for more information). The Basys2 board is designed to work with the free ISE WebPack CAD software from Xilinx. WebPack can be used to define circuits using schematics or HDLs, to simulate and synthesize circuits, and to create programming files. Webpack can be downloaded free of charge from www.xilinx.com/ise/. The Basys2 board shipswith a built-in self-test/demo stored in its ROM that can be used to test all board features. To run the test, set the Mode Jumper (see below) to ROM and apply board power. If the test is erased from the ROM, it can be downloaded and reinstalled at any time. See www.digilentinc.com/Basys2 for the test project as well as further documentation, reference designs, and tutorials.
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Copyright Digilent, Inc. All rights reserved. Other product and company names mentioned may be trademarks of their respective owners.

Basys2 Reference Manual

Digilent
www.digilentinc.com

Board Power The Basys2 board is typically powered from a USB cable, but a battery connector is also provided so that external supplies can be used. To use USB power, simply attach the USBcable. To power the Basys2 using a battery or other external source, attach a 3.5V5.5V battery pack (or other power source) to the 2-pin, 100-mil spaced battery connector (three AA cells in series make a good 4.5+/- volt supply). Voltages higher than 5.5V on either power connector may cause permanent damage. Input power is routed through the power switch (SW8) to the four 6-pin expansion connectors...