How do i assign FMC_a12 when stmcubemx limits me SDRAM to just 12 bits?

[DReis.1]

I am trying to program an STM32H7x3 device. My memory device (AS4C16M16SA) has address bits A0 - A12 and seems to need each of the 13 signals for access. However, when I go into STMCubeMX there is a max on SDRAM of 12 address bits.

It seems like I should be able to assign the A12 address to pin PG2 based on Table8 in the DS12117 product document.

How can I override STMCubeMX to allow me to connect the full address bus?

[Tesla DeLorean]

I'll flag the post.

Check PG2 isn't committed to some other function.

Worse case let it auto-gen the code, and then selectively edit it to add the pin, and address width configurations.

[DReis.1]

Good point, I can just wire to the pin and then clean up the auto-gen code. Can you confirm that will work with the FMC? I'd be worried the controller couldn't interface with the extra pin - but that doesn't really make sense because there are larger width memory chips that need 16 bit address.

The PG2 pin isn't required for anything in particular.

Thanks

[Tesla DeLorean]

Guessing there is a rule related to lower pin count devices.

@Imen DAHMEN​  @Amel NASRI​  @Khouloud GARSI​ can you review this for the STM32H753IIK [UFBGA176] rules/templates, thanks.

[DReis.1]

I see in the user manual that the diagrams call out for 13 bit address bus line:

[Tesla DeLorean]

Yes, and I'm sure that works, perhaps use the HAL libraries directly rather than getting the dumb code robot involved.

[Khouloud ZEMMELI]

​Hello @DReis.1​ ,

Could you please check with the latest CubeMX version ? Max bits 13 on my side.

Thanks

Khouloud

[Khouloud ZEMMELI]

​@DReis.1​