STM32F4x5 Redundant NAND Flash Setup (NWAIT or INT[3:2])

[gigaBIT3]

I'm trying to setup a pin configuration so that I can start making a PCB. 

I want to use two NAND flash ICs connected to the STM32F415ZGTx using the FSMC, setup in a way that there is a redundant backup of data and logs in the event of a failure. 

When I go to configure both, it seems that they both are using the same NWAIT pin so I am not sure whether I should continue to use this same pin for both chips or if I should switch to using INT2 and INT3.  I also have PSRAM in the configuration which also seem to be using the NWAIT pin (PD6).

Sorry in advance if this is a dumb question :) - first time using STM32CUBEMX/IDE so I am pretty new to configuring pinouts.  Mostly just used prebuilt boards but I wanted to learn how to work with the platform.

[KDJEM.1 · Accepted solution]

Hello @gigaBIT3 and welcome to the community,

Firstly, I apologize for my late reply.

If both NANDs memories and PSRAM require NWAIT signal interface with FMC, the probe is rejected (as there is only one NWAIT interface for three memories).

Could you please look at these resources that may help you to configure FMC using STM32CubeMX and STM32CubeIDE.

• How to configure the FMC peripheral to interface an STM32 MCU with an external NAND flash - STMicroelectronics Community 
• How to configure the FMC peripheral to interface an STM32 MCU with an external NOR flash memory - STMicroelectronics Community
• How to set up the FMC peripheral to interface with the SDRAM IS42S16800F-6BLI from ISSI - STMicroelectronics Community

Thank you.

Kaouthar