SDRAM 32bit bus can't be selected for STM32H735IGT6?

[JKim.51]

Hello,

I'm trying to connect SDRAM to STM32 for the first time and I'm having trouble understanding the specs.

In the datasheet, it seems the FMC peripheral can not support 32bit memory. Is it right?

and could you recommend 64Mbit SDRAM for STM32H735IGT6?

I confuse connection interface with STM32H735IGT6 and SDRAM.

Thank you

[TDK · Accepted solution]

The STM32H735IGT6 (LQFP 176) lacks the necessary pins for 32-bit mode. Only the UFBGA176+25 parts have these pins.

For part selection, I'd recommend going to Digikey or your favorite parts supplier and searching by memory size and availability. Memory parts change frequently, so be aware they may only be available for a couple years.

[FBL]

Hello @JKim.51 

> It seems the FMC peripheral cannot support 32bit memory. Is it right?
As referenced in the note below the table, the 24-bit SDRAM controller is a 32-bit controller with only a 24-bit data bus and without NBL2-3. It can be used for graphical purposes to access aligned 32-bit words ignoring upper 8 bits. 

[JKim.51]

Thank for your answer. It is very helpful.