Disclosed is a multiplexing scheme that allows the FPI (Front Panel Interface) protocol and the I2C (Inter‐
Integrated Circuit) protocol to exist on the same bus, without contention between the FPI Master, the
FPI Slave/I2C Master, and the I2C Slave. It includes both the necessary hardware and the communication
scheme itself to be implemented in firmware.
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INC, HP, "FPI SLAVE/12C MASTER BUS MUXING", Technical Disclosure Commons, (April 02, 2019)