M95P32 EEPROM using OctoSPI interface in memory mapped mode

[erussell]

I would like to know if the M95P32 EEPROM can be used by the OctoSPI interface on a STM32L4R9 processor in memory mapped mode? And if so, is there an example of a driver available?

[KDJEM.1]

Hello @erussell ;

The OctoSPI interface can be used to manage a single, dual, quad or octo SPI.

In that way, you will have the flexibility to communicate with the M95P32 in single, dual or quad SPI.

Please take a look to these posts:

- Could you kindly share any reference schematics for SPI EEPROM M95P32-I interfacing with STM32 MCU?

- Solved: M95P32 EEPROM using QSPI interface on Nucleo-L496ZGP

Thank you.

Kaouthar

[erussell]

Thank you for your response. Yes I had read those previous posts. I do understand that the M95P32 EEPROM can be connected to the OctoSPI interface on the STM32L4R9 processor but I wanted to know whether the memory mapped mode could be used. I didn't see that as specifically addressed.

[Tesla DeLorean]

If you can read it via standard command methods, ie a CMD +3 or +4 byte addressing, then this is used as a TEMPLATE for the Memory Mapped Mode, where the HW substitutes the masked address of the memory access into the interaction with the memory

ie 0x90000000 in STM32 memory space is 0 (zero) in the memories address space.

The mode can be 1, 2 or 4-bit, whatever you have the memory operating in, or the command used.

[erussell]

Ok - thanks. I had seen an earlier post regarding a similar question involving a STM32G4 and its quadSPI interface and the answer seemed to indicate that memory mapped mode could only be used for Reads. But I wasn't sure whether the response meant the normal SPI interface or the quadSPI interface. Anyway I will assume that I can use the memory mapped mode with the octoSPI interface.