RT1176 : Flexspi two octals flash memories and dqs

vincent_massonn · ‎02-09-2023

Hi,

We are developing a new board with two octal flash memories with DQS (data strobe) with a RT1176 processor.

It is possible to use two octal memories on the flexSPI bus with the data strobe signal for each memory ? I have some difficulties to understand the reference manual (i.MX RT1170 Processor Reference Manual, Rev. 1, 05/2021, pagge 2333) on this point.

If yes :

What is the correct pin assignement for DQS pin and chip select pin ?

Example : A_SS0_A and DSQ_A for memory octal A, B_SS0_B and DSQ_B for memory octal B....

What is the flexspi mode ?

Example : COMBINE or PARALLEL. or INDIVIDUAL.

Thank you.

Regards,

Vincent.

PabloAvalos · ‎02-09-2023

Dear @vincent_massonn

Thanks a lot for reaching our technical support. I was assigned to handle your case I am happy to assist you.

Regarding your questions see my answers below:

"It is possible to use two octal memories on the flexSPI bus with the data strobe signal for each memory ?"

--Yes, it is possible.

"What is the correct pin assignment for DQS pin and chip select pin ?"

--Please see the picture attached below from Data Sheet about the DQS pins for FlexSPI:

Additionally to this questions, I think that these couple of threads from our community are very helpful to solve your concern:

https://community.nxp.com/t5/i-MX-RT/Can-FlexSPI-DQS-be-ignored/m-p/1522033#M21629

https://community.nxp.com/t5/i-MX-RT/RT1176-flexSPI-DQS-connection-for-max-R-W-speed/m-p/1426722#M18...

"What is the flexspi mode ? "

--Individual.

Please let me know if you have some additional questions or something more I can help you with.

Sincerely,
Pablo Avalos.