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1. If you don't use our USB API, switch S1A to OFF (S1B to ON). This way you disable FX2 activity on SPI bus and FPGA will boot from SPI by power on. (Fastest boot)

2. If you need USB API.

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• Switch S1B to OFF. This way FX2 will control FPGA power and FPGA will start boot only after FX2 initialization

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• Enable "reset_on_error" option for bootstream generation. This way, even if S1B is on and FX2 SPI init and FPGA boot will be in the same time (and bitstream will be corrupted during transfer by SPI) FPGA will reboot again if error occur.

Init and boot time depend on board capacitance and power supply so may vary from board to board, which affect to boot behavior.

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