Xilinx Virtex-4 FX FPGA, User Manual

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ML42 x User Guide www.xilinx.com 13
UG087 (v1.3) May 30, 2008
Detailed Description
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1. Power Switch
The board has onboard power supplies and an ON|OFF power switch. When lit, the V5
LED indicates power.
On Position
In the ON position, the power switch enables delivery of all power on the board by way of
voltage regulators situated close to the left side of the board and the MGT power supply
module situated close to the right side of the board. These regulators feed off the 5V
external power brick or the 5V power supply jack.
The 5V power brick is capable of providing a maximum of 6.5A. For designs that require
greater than 6.5A, an ATX power supply can be connected to the J16 hard drive power
connector.
Note:
5V must always be supplied to the board to enable the 3.3V regulator for the System ACE
chip.
Off Position
In the OFF position, the power switch disables all modes of power on the board.
Onboard Regulation
The ML42 x platform has onboard regulation for the DUT main power supplies listed in
Table 2 . These regulators also have a corresponding input voltage jack to supply each
voltage independently from the bench-top power supply.
Power Select Jumpers
The power select jumpers are labeled JACK on one side of the header and SUPPLY on the
other side of the header. Appropriate placement of the jumpers on these headers enables
delivery of power from either the onboard regulators or the corresponding power supply
jack.
Table 2: Onboard Regulation
Power
Supply
Name
Max
Current
Rating
Typical
Voltage
Jack
Description
ML421
ML423
ML424 Select
Jumper
5V N/A 5V J9/J33 J27/J12 N/A
Main input voltage for the board supplied
through the jack, barrel connector, or Molex
connector
VCC3 3A 3.3V N/A N/A N/A
Supplies 3.3V to the System ACE chip and
other onboard circuits
VCCINT 6A 1.2V J37 J34 J105 Core voltage for the FPGA
VCCO 6A 2.5V-3.3V J34 J28 J106 I/O voltage for the FPGA
VCCAUX 3A 2.5V J36 J33 J58 Auxiliary supply voltage for the FPGA
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