m95m01-A125 not working with 10MHz clock

[azezurrehman]

The M95M01-DWMN3TP/K (NVM) is connected to a custom MPC5775B board. It works with a 5 MHz clock. According to the datasheet, it should support frequencies above 8 MHz, but it does not work with an 8–10 MHz clock or higher.

[Peter BENSCH]

Welcome @azezurrehman, to the community!

You didn't ask a question, but I'm guessing you want to know what you need to do to get it to work up to the 16MHz mentioned in the data sheet?

Well, SPI is based on single-ended transfers, so the usable clock frequency depends on the environment, e.g. the layout. If you want a statement on this, you should therefore provide information on the layout.

Regards
/Peter

[azezurrehman]

dear @Peter BENSCH 

Thank you for your response.

Could you please clarify what exact layout guidelines or connection considerations we should follow to ensure reliable communication between 8 MHz and 16 MHz, as mentioned in the datasheet?

If there are specific recommendations regarding trace length, termination, grounding, or decoupling for SPI lines at these speeds, that would be very helpful.

Appreciate your support.

Best regards,
Azezur Rehman

[Peter BENSCH]

Well, the general recommendations for SPI apply, which can be found in abundance on the Internet using your preferred search engine, e.g. here or there.

In addition, the parameters of the SPI pins of the MCUs used also play an important role, so you should contact its manufacturer about this.

Good luck!
/Peter

[azezur_rehman]

dear @Peter BENSCH 

Thank you for your reply.

I will also contact the MCU manufacturer as you suggested. In the meantime, I would like to share the NVM schematic part (attached) so that, if possible, you could suggest any improvements or changes that might help with reliable operation at higher SPI clock frequencies.

Best regards,
Azezur Rehman

[Andrew Neil]

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@azezurrehman wrote:

 a custom MPC5775B board. .

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For a custom board, you need to provide details: schematics and, as @Peter BENSCH said, layout.

Good, clear photos may also help

See: How to write your question to maximize your chances to find a solution

Have you used an oscilloscope to check that the signals are good & clean - especially at the higher frequencies?