NCJ29D5 SPI communication with abnormal waveform on SDI signal

[guojieming]

Dear NXP developers：

    There is a project using NCJ29D5, and during the testing process, it was found that the SDI waveform in the SPI interface communicating with the MCU was abnormal. As the input of SPI, SDI detected (and read registers) in an pull-up state, which caused anomalies in the SPI waveform, as shown in the attached figure. We would like to know:
1) As an SPI communication, should SDI be pulled up?
2) If SDI is pulled up, will this waveform affect normal SPI communication?

[Ricardo_Zamora]

Hello,

Hope you are doing well. Sorry for the inconvenience this might cause you but as the information of this product it's under NDA (Non-Disclosure Agreement) the information it's not public, this is not a secure channel to share any information of this device and I do not have the data as well for the same reason.

For more information about the chip could you please contact one of our distributors available in the Distributor Network|NXP? Or if you have a direct contact who helped you with information about this product in a first place, please communicate with him/her.

Regards,

Ricardo