The Fast Serial Interface (FSI) module is a serial communication peripheral capable of reliable high-speed communication across isolation devices. Galvanic isolation devices are used in situations where two different electronic circuits, which do not have common power and ground connections, must exchange information. Though isolation devices facilitate these signal communications, they can also introduce a large delay on the signal lines and add skew between the signals. The FSI is designed specifically to ensure reliable high-speed communication for system scenarios that involve communication across isolation barriers without adding components.

The FSI consists of independent transmitter (FSITX) and receiver (FSIRX) cores. The FSITX and FSIRX cores are configured and operated independently.

For additional information on the FSI module, refer to Fast Serial Interface (FSI) Skew Compensation.