Hi Alex, LM98714 SPI has been designed for fast clock, frequencies up to the main clock-INCLK. For fast SPI clock, external SPI driver should not violate the spec set-up and hold time. If the drive SCLK Tr/Tf is very slow and main clock is off, SPI will not work. With main clock( INCLK) On , SPI works according to spec up to at least Tr/Tf=400nS. My recommendations: 1) Fast SPI clock: Tsetup>4nS, Thold>1nS 2) For very slow SPI clock: Tr/Tf 4xTinclk 4) What RESET non spec parameter you need: the min RESET width? Thank you, Costin
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