[i.MX 8ULP and IW612] Please advise on Tclk for 802.15.4 SPI Timing

[kazuyayamauchi]

We are developing a system using i.MX 8ULP and IW612(Murata:LBES5PL2EL).
(The SPI Host uses LPSPI in the i.MX 8ULP Real-Time Domain (Cortex-M33) + FreeRTOS.)

We are facing an issue where data is garbled in 802.15.4 SPI communication.
We have double check the SPI timing and found that it meets the "802.15.4 SPI Timing Parameters"
in IW612's datasheet.
=> We had TIC check the SPI clock waveform of our system, but no particular problems were found.

We are operating with the following settings.
Tclk: 989.2ns
SPI clock frequency: 1.0109MHz

Could you please advise us if there are any points to check
other than the "12.6 SPI host interface specifications" in the datasheet?

* The attached "waveforms.xlsx" is the SPI waveform of our system.

Best Regards,

[kazuyayamauchi]

Thank you for your reply.

Ok I understood, please continue support for me on case#00715641.

Best Regards,

[kazuyayamauchi]

Sorry for my update overdue.

We received a comment that the SPI waveform is fine, but the problem of garbled characters still occurs in our system.
Could you please any advice to narrowing down the cause of this issue?

Best Regards,

[shaun_wu]

Hello @kazuyayamauchi 

Sure. Due to we have two cases discussion same problem, I'll continue support you on case 00715641.

Best Regards

Shaun

[shaun_wu]

Hello @kazuyayamauchi 

We had discussion on this problem on case 00715641, on my view the waveform is good. 

I share host side datasheet for you reference. you may refer to 5.4.4.5

https://www.nxp.com/docs/en/data-sheet/IMX8ULPCEC.pdf

Please let us know if you have further questions.

Best Regards

Shaun