Attempting to run OctoSPI on STM32H753ZI

[sammie.k]

It might as well be a dumb question, but is it in any way possible to connect and communicate with a Octo SPI slave with the dual Quad-SPI interface available on the STM32H753ZI?

Thanks and best!
Sam.

[raptorhal2]

Presumably, yes. For more definitive answers, identify the slave device.

Compare H743 Dual or Quad SPI pin compatibility with the slave.

[sammie.k]

Thanks, that sounds promising, then! We intend to connect the memory module APS512XXN-OBRx to the STM32H7x3, and (almost) all the pins (except 1) are compatible to the dual Quad SPI. The only concern remains is with the DQS/DM (/RWDS - R/W data strobe), which does not exist on the quad SPI. I might give a try to achieve this using another pin, but would be glad to get other ideas to implement the same.

Best!
Sam.

[raptorhal2]

Check the APS data sheet timing diagram. I suspect RWDS is just another name for the SPI clock.

[raptorhal2]

My correction, RWDS is not the SPI clock.

The STM32L5 has OCTOSPI with DQS. Take a look.

[LCE]

I recommend to test this before doing a PCB layout. QSPI seems a little restricted on some STM32.

And ask AP Memory, they have a really nice and helpful guy called Alex around here: @Alex - APMemory 

[sammie.k]

We are still in the contemplation phase, so we do have time before we decide on the PCB design. But yes, our estimates at going for Octo SPI using QSPI seem to be overhelming.

[Tesla DeLorean]

Uphill both ways..

Good time to revisit part choices, the H743/753 is VERY OLD, surely better choices, and perhaps pin compatible/similar parts with better designed and tested options.

[LCE]

The H735 is definitely working great with OCTOSPI in HyperRam mode, I have that right beside me on the table, using the H735 Discovery Kit, you should check its schematics.

[sammie.k]

To all those who have answered and also all who are wondering what happened further - we ended up deciding on the STM32H735 alternative for the OctoSPI (rather Hyperram) solution on our device. Thank you once again, everyone!