Hi,
To answer your question whether NIOS is required when using Remote update over I2C with FPGA,
Yes, NIOS is required. NIOS II will act as controller as FPGA need a specific controller when doing remote update over I2C.
You can refer to below userguide for more information on I2C remote update:
https://www.intel.com/content/dam/support/us/en/programmable/support-resources/fpga-wiki/asset03/user-guide-151.pdf
There is also I2C remote update design example for reference:
https://www.intel.com/content/www/us/en/design-example/714746/intel-max-10-fpga-i2c-remote-system-update-design-example.html
Regards,
Aiman
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