Dear Lime Team,
I have a question regards the I2C Port Expander. Maybe @Zack can help.
Originally I thought the port expander was utilized to generate additional I/O’s for the FX3. Looking over the schematics of the board I realized that the expander is e.g. used as the slave select for the FPGA flash memory (EXP_AS_SS). However, there is the non-fitted R72, which could connect the FX3 GPIOs (FX3_SPI_AS_SS). Is there a specific reason why the port expander has been used for this purpose?
Any help would be greatly appreciated.
Thank you very much!