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Chapter 12
Power Distribution
AC Wall Adapter
The Spartan ? -3 FPGA Starter Kit includes an international-ready AC wall adapter that
produces a +5V DC output. Connect the AC wall adapter to the barrel connector along the
left edge of the board, indicated as 25 in Figure 1-2 . There is no power switch to the board.
To disconnect power, remove the AC adapter from the wall or disconnect the barrel
connector.
The POWER indicator LED, shown as 26 in Figure 1-2 , lights up when power is properly
applied to the board. If the jumpers in the J8 header and JP1 header are properly set and
there is a valid configuration data file in the Platform Flash memory, then the DONE
indicator LED, shown as 18 in Figure 1-2 , also lights up.
The AC wall adapter is directly compatible for North America, Japan, and Taiwan locales.
Other locations might require a socket adapter to convert from the North American
standard to the local power socket standard. The AC wall adapter operates from 100V to
240V AC input, at 50 or 60 Hz.
Voltage Regulators
There are multiple voltages supplied on the Spartan-3 Starter Kit Board, as summarized in
Table 12-1 .
Table 12-1:
Voltage Supplies and Sources
Voltage
+5V DC
+3.3V DC
+2.5V DC
+1.2V DC
Source
AC Wall Adapter, 5V switching power supply
( 25 in Figure 1-2 )
National Semiconductor LM1086CS-ADJ 3.3V
regulator ( 27 in Figure 1-2 )
STMicroelectronics LF25CDT 2.5V regulator
( 28 in Figure 1-2 )
Fairchild Semiconductor FAN1112 1.2V
regulator ( 29 in Figure 1-2 )
Supplies
3.3V regulator
Optionally, PS/2 port via jumper JP2 setting
Pin 1 (VU) on A1, A2, B1 expansion connectors
2.5V and 1.2V regulators
V CCO supply input for all FPGA I/O banks
Most components on the board
Pin 3 on A1, A2, B1 expansion connectors
V CCAUX supply input to FPGA
V CCINT supply input to FPGA
Spartan-3 FPGA Starter Kit Board User Guide
UG130 (v1.2) June 20, 2008
www.xilinx.com
45
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