The FPC202 is designed to interface with two ports and aggregate the I2C and low-speed control and status signals associated with these ports into a single host-side interface (I2C or SPI). Multiple FPC202s can be combined to support up to 28 total ports, all of which are controlled through the same host-side interface. This greatly reduces the number of signals which route to the host controller, saving valuable I/O resources, board routing space, and bill of materials (BOM) cost.

Functionally, the FPC202 is organized as shown in Section 7.2. Two types of host-side control interfaces are supported (I2C and SPI) for controlling and monitoring the downstream ports. The FPC202 has four special outputs per downstream port (S0_OUT_C, S0_OUT_D, S1_OUT_C, and S1_OUT_D) which can be used to drive port status LEDs.