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To me the question is not what brand of fpga they used. (there all prety similiar from a high level perspective)
I wonder why an fpga? So they plan to reprogram it from firmware updates? Than they need a ceperate interface between the cpu and the fpga for that.
(altho partially reprogramaming the fpga over the audio/clock interface might be possible it wouldnt be easy)
Yeah, I think that is probably the whole idea. You don't want finalized ASIC, and instead will have FPGA with some config Eeprom to load the updated code. The only thing we know for sure is that audio processing will be done outside of snapdragon SoC, running on FPGA with a code designed by iBasso. It is a new chapter for them, so I'm sure they will come up with fixes and optimizations down the road. Look at Chord, they use Xilinx FPGA with a fully customized code developed by Rob Watts which they update and optimize upon need.