Altera Nios Development Board Cyclone II Edition Instrukcja Użytkownika Pobierz pdf (Strona 56)

2–44 Reference Manual Altera Corporation

Nios Development Board Cyclone II Edition May 2007

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 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 VTT.

1.25V TP9 F4 DDR SDRAM I/O VREF.

2.5V TP11 F6 DDR SDRAM VDD power supply. FPGA VCCIO for pins that

interface to DDR SDRAM.

3.3V J29 F2 3.3V power for multiple components on the board.

5V J28 F1 5.0V power for multiple components on the board.

+12V J31 F8 Power for the PMC connectors.

-12V TP13 F9 Power for the PMC connectors.

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