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December 6, 2004
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
© Digilent, Inc.
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Power
1.8VDC
jack
regulator
5-9VDC
3.3VDC
regulator
Xilinx Spartan2E XC2S300E-FT256
A1
B1
Figure 1. D2-FT Circuit Board Block Diagram
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).
7 pages
www .d ig ilen tinc .c om
246 East Main | Pullman, WA 99163
(509) 334 6306 Voice and Fax
ND
Clock
2
Push
Status
Clock
button
LED
(50MHz)
Expansion Connectors
A2
B2
C1
Doc: 502-036
Configuration
(flash) ROM
C2
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Related Manuals for Digilent D2-FT
Summary of Contents for Digilent D2-FT
- Page 1 I/O. spaced DIP headers available from any catalog distributor. A pushbutton and LED are The D2-FT has been designed to work with all also included for basic I/O. versions of the Xilinx ISE CAD tools, including the free WebPack tools available at Xilinx web The D2-FT board has been designed to serve site.
- Page 2 Figure 2. JTAG Signal Routing on D2-FT The scan chain can be driven from the primary Power Supplies port by powering on the D2-FT, connecting it to a PC with a JTAG programming cable, and The D2-FT board uses two LM317 voltage running the “auto-detect”...
- Page 3 VCCO = 1.25(1 + R12/R11). signals, and pins 36-40 are reserved for JTAG and/or clock signals. (See Figure 4) Refer to the LM317 data sheet and D2-FT schematic for further information. The expansion headers provide 192 signal connections, and the Spartan 2E-FT256 has 172 available I/O signals.
- Page 4 The diagrams below show signal timings data, a chip select, and a clock to enable assumed by Digilent to create peripheral synchronous transfers. System bus timings devices. However, any bus and timing models...
- Page 5 D2-FT Reference Manual Digilent, Inc. pins 4 -21 pins 22 -35 pins 4 -21 pins 22 -35 MA2(14) MB1(14) Spartan 2E PB(18) Sys Bus (18) FT 256 pins 22 -35 pins 4 -21 pins 22 -35 pins 4 -21 Figure 5. Expansion Connector Signal Routing Pin 39 Pin 3: 3.3V...
- Page 6 D2-FT Reference Manual Digilent, Inc. Table 2. D2-FT Expansion Connector Pinout Pin # FPGA FPGA FPGA FPGA FPGA FPGA Signal Signal Signal Signal Signal Signal VCC33 VCC33 VCC33 VCC33 VCC33 VCC33 ADR0 J14 PAI01 B12 ADR0 J14 PBI01 M10 PCADR0...
- Page 7 D2-FT Reference Manual Digilent, Inc. Table 3. D2-FT FPGA Pin Assignments MC1- MC1- MC1- MB2- IO10 ASTB MC1- MC1- MC1- IO13 MC1- MC1- MC1- MC1- MB2- VCCI VCCI IO12 IO14 DSTB ADR4 ADR2 ADR0 WAIT MC1- MC1- MC1- MB2- MB2-...
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