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the maximum capable. The SP-305 board is normally shipped with a 15W power supply
which should be sufficient for most applications.
Oscillator Sockets (5)
On the back side, the SP305 Development Platform has two crystal oscillator sockets, each
wired for standard LVTTL-type oscillators. (Note: A 100 MHz oscillator is pre-installed in
the X1 SYSCLK socket.) These connect to the FPGA clock pins as shown in
oscillator sockets accept half-sized oscillators and are powered by the 3.3V supply.
Table 2-2: Oscillator Socket Connections
DIP Switches (6)
There are eight general purpose (active-high) DIP switches connected to the user I/O pins
of the FPGA. See
Table 2-3: DIP Switches Connections (SW1)
SP305 Spartan-3 Development Platform User Guide
UG216 (v1.1) March 3, 2006
5V to USB and PS/2
TPS54310
3A SWIFT
TPS54310
6A SWIFT
5V Brick
3A
TPS54310
3A SWIFT
TPS73118
150mA LDO
Figure 2-4: Power Supply Diagram
Label
X1
SYSCLK
X6
USERCLK
Table 2-3
for a summary of these connections.
SW1
FPGA Pin
1
AE8
2
AF8
3
Y9
4
AA9
www.xilinx.com
TPS51100
3A DDR LDO
5V
2.5V to DDR SDRAM
1.2V
to FPGA Core
3.3V
to FPGA I/O. Digital Supply
1.8V
to PROM
Clock Name
SW1
5
6
7
8
Detailed Description
1.25V
to VTT
UG216_04_101105
Table
2-2. The
FPGA Pin
AD13
AE14
FPGA Pin
AB9
AC9
AD9
AE9
9
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