Altera Nios Development Board Stratix II Edition - Manual (Page 54)

2–44 Reference Manual Altera Corporation
Nios Development Board Stratix II Edition May 2007
Board Components
Power-Supply
Circuitry The Nios development board runs on a 16.0 V, unregulated, input power
supply connected to J26. On-board circuitry generates ±12.0 V, +5.0 V,
+3.3 V, +2.5 V, and +1.2 V 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 5.0 V supply is presented on pin 2 of J12 and J15 for use by any
device plugged into the PROTO1 & PROTO2 expansion connectors.
■ The 3.3 V supply is used as the power source for all FPGA I/O pins.
The 3.3 V supply is also available for PROTO1 & PROTO2 daughter
cards.
■ The 2.5 V supply is used only as the power supply for the DDR
SDRAM chip and is not available on any connector or header.
■ The 1.2 V supply is used only as the power supply for the Stratix II
device core (VCCINT) and it is not available on any connector or
header.
■ The ±12.0 V 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
7 A 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 Pad Fuse Note
1.2V J30 F3 Core power for FPGA.
1.2V TP12 F7 FPGA PLL power supply.
1.25V TP10 F5 DDR SDRAM I/O V
TT
.
1.25V TP9 F4 DDR SDRAM I/O V
REF
.
2.5V TP11 F6 DDR SDRAM VDD power supply. FPGA V
CCIO
for pins that
interface to DDR SDRAM.
3.3V J29 F2 3.3 V power for multiple components on the board.
5V J28 F1 5.0 V power for multiple components on the board.
+12V J31 F8 Power for the PMC connectors.
-12V TP13 F9 Power for the PMC connectors.