Chapter 4: Electrical Requirements; Power Consumption - Xilinx Virtex-4 ML461 User Manual

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Electrical Requirements
This chapter provides the electrical requirements for the Virtex-4 ML461 Development
Board. It contains the following sections:
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Power Consumption

Table 4-1
the ML461 board devices. The Virtex-4 ML461 Development Board has provisions for two
power inputs: a 5V power supply and a 12V power supply. The maximum rating of a
commercially available 5V power supply is limited to 8A, or a 40W maximum capacity.
This power supply is similar to the 5V brick used for previous memory tool kits, for
example, ML361 and ML365. This tool kit expects the Virtex-4 ML461 Development Board
to exercise only one external memory interface at a time. In this case, the total power
consumption of the board stays within the 40W limit.
As shown in
activated simultaneously, then the total power consumption is 57W, which exceeds the
40W capacity of the 5V power brick. So an alternate 12V power input jack (J5) is provided
on the Virtex-4 ML461 Development Board to hook up a 12V power brick, for example,
CUI DTS120500U with a 60W capacity. The 12V is converted to 5V using TI's
PTH12010WAS power module (VR6), which can supply up to 12A of current at 5V, or a
60W capacity.
Virtex-4 ML461 Development Board User Guide
UG079 (v1.1) September 5, 2007
"Power Consumption"
"FPGA Internal Power Budget"
"Power Measurements on the ML461"
lists the operating voltages, maximum currents, and power consumption used by
Table 4-1, if all four FPGA devices and their associated memory devices are
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Chapter 4
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