Digilent D2-FT - Manual

D D i i g g i i l l e e n n t t D D 2 2 - - F F T T S S y y s s t t e e m m B B o o a a r r d d
R R e e f f e e r r e e n n c c e e M M a a n n u u a a l l
www.digilentinc.com
December 6, 2004 246 East Main | Pullman, WA 99163
(509) 334 6306 Voice and Fax
© Digilent, Inc. 7 pages Doc: 502-036
Overview
The Digilent D2-FT circuit board provides the
basis for a complete circuit development
platform centered on a Xilinx Spartan 2E
FPGA. D2-FT features include:
• A Xilinx XC2S300E FPGA with 300K
gates and 350MHz operation (also
available with the XC2S400E FPGA);
• 172 user I/Os routed to six standard 40-
pin expansion connectors;
• A socket for a JTAG-programmable
18V02 configuration Flash ROM;
• Dual on-board 1.5A power regulators
(1.8V and 3.3V);
• An SMD 50MHz oscillator, and a socket
for a second oscillator;
• A JTAG programming port;
• A status LED and pushbutton for basic
I/O.
The D2-FT has been designed to work with all
versions of the Xilinx ISE CAD tools, including
the free WebPack tools available at Xilinx web
site. (
www.xilinx.com ) A growing collection of
low-cost expansion boards can be used with
the D2-FT to add analog and digital I/O
capabilities, as well as various data ports like
Ethernet and USB. The D2-FT board ships
with a power supply and programming cable,
so designs can be implemented immediately
without the need for any additional hardware.
Functional Description
The Digilab D2-FT provides a minimal system
that can be used to rapidly implement FPGA-
based circuits, or to gain exposure to Xilinx
CAD tools and Spartan 2E devices. The D2-FT
provides only the essential supporting devices
for the Spartan 2E FPGA, including clock
sources and power supplies. All available I/O
signals are routed to standard expansion
connectors that mate with 40-pin, 100 mil
spaced DIP headers available from any
catalog distributor. A pushbutton and LED are
also included for basic I/O.
The D2-FT board has been designed to serve
primarily as a host for peripheral boards. Each
of the six expansion connectors provides the
unregulated supply voltage (VU), 3.3V, GND,
and 32 I/O signals from the FPGA. Because
there are more connector pins than FPGA
pins, the A1 and B1 connectors share an 18-
pin bus. All other connector positions are
driven by individual FPGA signals. JTAG
signals are also routed to the A1, B1, and C1
expansion connectors. This allows peripheral
boards to drive the scan chain, or to be
configured along with the Spartan 2E FPGA.
Application-specific peripheral boards can be
created to mate with the D2-FT, or ready-made
peripheral boards that offer many standard I/O
and data port functions can be obtained from
Digilent (for a current listing of available
boards, see www.digilentinc.com).
P
A
bus
M
A
2 bus
A1 B2
B1
C1 C2
Syste
m
B
us
M
A
1 bus
M
B
1 bus
P
B
bus
M
C
2 bus
P
C
2 bus
P
C
1 bus
A2
Clock
(50MHz)
Power
jack
5-9VDC
1.8VDC
regulator
Status
LED
Push
button
Configuration
(flash) ROM
3.3VDC
regulator
2 ND
Clock
JT
AG
Xilinx Spartan2E XC2S300E-FT256
Expansion Connectors
M
B
2 bus
M
C
1 bus
JT
AG
JT
AG
Figure 1. D2-FT Circuit Board Block Diagram