STM32N6 SDRAM reference design?

[ov]

Greetings,

We're a small team designing a board around the STM32N6 and need a large external memory (e.g. 64MB of SDRAM). Due to the complexity of routing and configuring timings I wonder if there exists a reference design for such a circuit, or at least for another MCU that's sufficiently similar that we can use it as a starting point. Any guidance would be very much appreciated.

Regards,

OV

[TDK]

Here's 64 MB SDRAM routing on an STM32F4 chip. Chip family doesn't change much here, signals are the same.

https://www.st.com/resource/en/schematic_pack/mb1075-f429i-e01_schematic.pdf

[exarian · Accepted solution]

Hey @ov 

Here is another STM32N6 specific design from the DK reference design, using the HEXASPI.

To RAM:

To STM32N6:

Ref: https://www.st.com/resource/en/schematic_pack/mb1939-n6570-c02-schematic.pdf