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H A R D W A R E
When a power supply voltage falls out of tolerance, the board is put in reset (the SYS_RST#
signal is asserted), and SYS_RSTn LED glows, and an LED along the right hand side of the
board will light to indicate which power rail has failed.
The voltage levels are measured with a RC filter “time constant” of around 1KHz. This means
transient voltage spikes may not trigger a board reset.
22.8
Heat
The maximum power dissipation supported for each FPGA is 25W. Using the provided heat
sink and fan assemblies, FPGAs will remain under the maximum recommended junction
temperature (85 degrees C). If your design exceeds this limit, you can assume the temperature of
the device rises 2 degrees for each watt above this amount your design uses. Put this number in
the settings of the timing analyzer.
Power requirements of a design can be estimated using the power estimator tool in ISE 9.1.
For this calculation the board is assumed to be in an ambient temperature of 35 degrees. In a
closed computer case, the ambient temperature will increase.
22.8.1
Fans
The fan units attached above the heat sinks are powered by 5V. Each fan has its own power
connector.
22.8.2
Removing Heatsinks
The heat sink/fan assemblies are attached using a plastic clip. There is a thermal interface
material between the FPGA and heat sink that is slightly adhesive. Forcibly removing the heat
sink will not damage the FPGA.
22.8.3
Fan Tachometers
Each FPGA fan has a tachometer connected to it for the detection of fan failure. If you intend
to use this system in a rack or production system, you may want to monitor the fans.
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