4.4 Filtering Capacitors

For some development use cases, it is necessary to interface to an external board such as the UMFT4222EV-D - FT4222H evaluation module, USB Hi-Speed to SPI/I2C Master/Slave. It has been found that the performance of the interface can be improved by adding a small filtering capacitor to the SPI0PER_nCS chip select line. For the R3 revision of the board, this capacitor has been integrated into the design. For the R2 revision, these need to be added. The schematic location of the capacitors is identical between the R2 and R3 revisions of the board and can be seen in figure Figure 4-10