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www.digilentinc.com
Revision: September 18, 2003
246 East Main | Pullman, WA 99163
(509) 334 6306 Voice and Fax
Copyright Digilent, Inc. All rights reserved
7 pages
Doc: 500-223
Overview
The Digilent D2-SB circuit board provides a
complete circuit development platform
centered on a Xilinx Spartan 2E FPGA. D2-SB
features include:
•
A Xilinx XC2S200E-200 FPGA with 200K
gates and 350MHz operation;
•
143 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-SB has been designed to work
seamlessly with all versions of the Xilinx ISE
CAD tools, including the free WebPack tools
available from the Xilinx website. A growing
collection of low-cost expansion boards can be
used with the D2-SB to add analog and digital
I/O capabilities, as well as various data ports
like Ethernet and USB. The D2-SB 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-SB 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-SB
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-SB 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 FPGA I/O signals. Because there are
more connector pins than FPGA pins, the A1,
B1 and C1 connectors share an 18-pin “system
bus”, and not all pins on the B expansion
connectors are used. 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-SB, or ready-
made peripheral boards that offer many
standard functions can be obtained from
Digilent (see www.digilentinc.com).
A2
B2
C2
Xilinx Spartan2E XC2S200E-PQ208
Expansion Connectors
System Bus
JTAG
MA1 bus
MB1 bus
MC1 bus
PA bus
MA2 bus
PB bus
MC2 bus
PC bus
Clock
(50MHz)
Power
jack
5-9VDC
1.8VDC
regulator
LED
Push
button
Config
ROM
3.3VDC
regulator
2
ND
Clock
JTAG
A1
B1
C1
D2-SB circuit board block diagram