Connect IC62 Reset pin to MMC IO/Extender
To ensure robustness of all subsystems and MMC structure during programming or due to gateware glitches, the #RESET Pin for IC62 could be connected to the MMC module. The FPGA would this way only gain access to the bus after the DONE signal is asserted and, if the MMC finds that some of the I2C bus is locked, it can also independently and transparently reset the FPGA's mux.
One of the remaining I/O extender pins could be used for this, as to not affect payload during MMC reset, as specified by the AMC standard.