Altera Stratix II GX PCI Express Development Board - Manual (Page 68)

2–58 Reference Manual Altera Corporation
Stratix II GX PCI Express Development Board August 2006
Power Supply
Power Distribution System
The main source of power comes from both the 12-V and 3.3-V pins on a
PCIe motherboard (host), or from a DC input jack and subsequent
laptop-style DC power supply. The nominal input spec is from
9 V to 20 V DC on the jack.
Figure 2–15 shows the board’s power
distribution system.
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This document assumes that the development board is
connected to a computer using a PCIe x8 slot. An external power
supply and cables have been provided so that you can use the
development board without connecting it to a PCIe chassis.
WARNING: DO NOT CONNECT THE EXTERNAL POWER
SUPPLY TO THE PCIe BOARD IF IT IS BEING POWERED
FROM A BACKPLANE PCIe x8 SLOT.
To use the external power supply, connect the power cable to the
board and plug the other end into a power outlet, then place the
power switch (SW1) in the ON position. When power is
supplied to the board, the LED (D19) illuminates. If the board
does not power up after you connect the power cable, ensure
that the power switch (SW1) is in the ON position.