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Board Components
Power-Supply
Circuitry
The Nios development board runs on a 16V, unregulated, input power
supply connected to J26. On-board circuitry generates +/-12V, +5V, +3.3V,
+2.5V, and +1.2V regulated power levels. For applications requiring high
current, separate voltage levels can be supplied from a workbench power
supply.
■
■
■
■
■
■
The input power-supply on J26 can be either center-negative or
center-positive. A bridge rectifier (D34) presents the appropriate
polarity to the voltage regulators.
The 5V supply is presented on pin 2 of J12 and J15 for use by any
device plugged into the PROTO1 & PROTO2 expansion connectors.
The 3.3V supply is used as the power source for all FPGA I/O pins.
The 3.3V supply is also available for PROTO1 & PROTO2 daughter
cards.
The 2.5V supply is used only as the power supply for the DDR
SDRAM chip and is not available on any connector or header.
The 1.2V supply is used only as the power supply for the Cyclone II
device core (VCCINT) and it is not available on any connector or
header.
The +/-12V supply is provided for the PMC connectors JH1 and JH2.
Refer to “PMC Connector (JH1 & JH2)” on page 2–26 for more
details. When workbench power supplies are connected to the board,
a corresponding fuse must be removed to decouple the on-board
voltage regulator. Each on-board regulator drives power through a
7A fuse. Refer to Table 2–23 .
Table 2–23 lists the details of what voltage levels can be supplied to what
points on the board.
Table 2–23. Power Supply and Fuse Details
Voltage
1.2V
1.2V
1.25V
1.25V
2.5V
Pad
J30
TP12
TP10
TP9
TP11
F3
F7
F5
F4
F6
Fuse
Note
Core power for FPGA.
FPGA PLL power supply.
DDR SDRAM I/O VTT.
DDR SDRAM I/O VREF.
DDR SDRAM VDD power supply. FPGA VCCIO for pins that
interface to DDR SDRAM.
3.3V
5V
+12V
-12V
J29
J28
J31
TP13
F2
F1
F8
F9
3.3V power for multiple components on the board.
5.0V power for multiple components on the board.
Power for the PMC connectors.
Power for the PMC connectors.
2–44 Reference Manual
Nios Development Board Cyclone II Edition
Altera Corporation
May 2007
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DK-NIOS-2S60N NIOS II KIT W/STRATIX II EP2S60N
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