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You need to take into account the POR time (you'll probably have to use a fast POR, but then, be sure that your power supplies will reach the correct level in time), then you have the configuration itself (page 9-20 gives you a method to estimate the maximum configuration time) and finally the initialization (pages 9-9/9-10) before the FPGA goes into user mode.
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Why would you be concerned that the power supplies are at the correct levels? Won't the FPGA start the POR time (3ms-9ms for Fast POR) once the power supplies have reached their correct levels?
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