Digilent Basys 2 Reference Manual

Basys 2™ FPGA Board Reference Manual
Revised April 8, 2016
This manual applies to the Basys 2 rev. C
Overview
The Basys 2 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 Basys 2 board 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)
Data JTAG
20
port port
Xilinx Spartan3E-100 CP132
32 2
PS/2 VGA Port
I/O Devices
Port
Figure 1. The Basys 2 board block diagram and features.
Four standard expansion ports allow designs to grow beyond the Basys 2 board using breadboards, user-designed
circuit boards, or Pmods (Pmods are inexpensive analog and digital I/O modules that offer A/D & D/A conversion,
motor drivers, sensor inputs, and many other features). Signals on the 6-pin connectors are protected against ESD
damage and short-circuits, ensuring a long operating life in any environment. The Basys 2 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 Basys 2 board can draw power and be programmed via its on-board USB2 port. Digilent's freely available PC-
based Adept software automatically detects the Basys 2 board, provides a programming interface for the FPGA and
Platform Flash ROM, and allows user data transfers (see
DOC#: 502-155
Other product and company names mentioned may be trademarks of their respective owners.
Platform Settable Clock
Flash Source
(config ROM) (25 / 50 / 100 MHz)
8 bit
4 4 4
color
JA JB JC JD
Pmod Connectors
Copyright Digilent, Inc. All rights reserved.

100,000-gate Xilinx Spartan 3E FPGA

Atmel AT90USB2 Full-speed USB2 port
providing board power and programming/data
transfer interface

Xilinx Platform Flash ROM to store FPGA
configurations

8 LEDs, 4-digit 7-segment display, 4 buttons, 8
slide switches

PS/2 port and 8-bit VGA port
4

User-settable clock (25/50/100MHz), plus
nd
socket for 2 clock

Four 6-pin header expansion connectors

ESD and short-circuit protection on all I/O
signals.
www.digilentinc.com for more information).
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