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FPGA configuration in SPI slave mode
#1
Before starting to dig in the schematics:  the AU and AU+ FPGA can be configured via USB.
How to handle this without USB ? Are the pins (and maybe mode selection pins) available to perform FPGA configuration in SPI slave mode (e.g. from a microcontroller)

Unless I am overlooking something, it seems there is no document explaining some basic functionality of the modules and by reverse engineering the schematic it's easy to overlook something.
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#2
The programming pins are broken out over the "Bank D" connector in the bottom right of the board. For the Au and Au+ these are the JTAG port.

You can connect something like a Platform Cable USB II from Xilinx to it but you will need to adapt to it, probably with a Br.

The mode pins are tied to 001 and can't be changed.
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