SPRUII7B June   2018  – April 2020 TMS320F280040-Q1 , TMS320F280040C-Q1 , TMS320F280041 , TMS320F280041-Q1 , TMS320F280041C , TMS320F280041C-Q1 , TMS320F280045 , TMS320F280048-Q1 , TMS320F280048C-Q1 , TMS320F280049 , TMS320F280049-Q1 , TMS320F280049C , TMS320F280049C-Q1

 

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2.1.4 FSI

The F28004x MCU features the industry first Fast Serial Interface (FSI). The FSI enables robust high-speed communications and is intended to increase the amount of information transmitted while reducing the costs to communicate over an isolation barrier. Though no isolator is included on this LaunchPad, the TXCLK, TXD0, TXD1, RXCLK, RXD0, and RXD1 signals are available on J11. This header is set up in such a way that adding jumpers on the pins will connect the TX to RX channels for external loopback and evaluation. Additionally, there are two GND signals on the connector that can be used for a wrapped-pair connection to an external board with FSI. The GPIOs connected to this header are also routed to the BoosterPack connectors through 0Ω resistors. As the FSI can toggle at up to 100 MHz rates, the longer traces to the BoosterPack headers can create unintentional noise on the signal due to reflection. Eliminating these extended traces by removing the in-circuit resistors will help to limit any noise or reflections.