LPSPI CLOCK LOOP_BACKED Mode application?

[JeorgeB]

Hi,

RM of s32k14x for LPSPI module says (Page 1632):

"Enabling the loopback version of the LPSPI_SCK can improve the setup time of the input data from the slave"

what means this?

2. in datasheet, in LPSPI timing, Master LOOP_BACKED MODE :

why using loop backed mode will increase SPI operation frequency?

Thanks.

[danielmartynek]

Hi Jeorge,

As shown below, the master can sample the MISO data using either the SCK ouput signal or the delayed SCK output signal.

If the sample loopback is used, it improves the min. setup time.

Regards,

Daniel