Support Request: DDR4 memory selection for custom PCB design based on STM32MP257F
Dear ST Support Team,
I am an embedded systems engineer currently designing a custom PCB around the STM32MP257F microprocessor for a product application (a camera-based embedded system). I am using the STM32MP257F-EV1 evaluation board as our reference design for both hardware and software bring-up.
We are now finalizing our own DDR memory design and are running into difficulty sourcing a DDR part that is confirmed compatible with the STM32MP257F. We understand the EV1 reference design uses two 16-Gbit DDR4 DRAMs (16-bit wide, populated for a 32-bit total bus), and that the STM32MP257 DDR controller supports DDR3L up to 2133, DDR4 up to 2400, and LPDDR4 up to 2400, in 16-bit or 32-bit configurations. However, when we check current market availability, we are not able to find DDR parts that are clearly qualified or validated against the STM32MP257F DDR controller, and we want to avoid selecting a part that causes signal integrity, timing, or DDR-training issues on our own layout.
Could you please help us with the following:
1. The exact DDR4 part number(s) and manufacturer used on the STM32MP257F-EV1 (MB1936) reference board, so we can use it as a known-good starting point.
2. A list of DDR4 / DDR3L / LPDDR4 memory parts and manufacturers that ST has qualified or validated with the STM32MP257 series, or any official DDR compatibility/qualification list or application note for this purpose.
3. Any recommended alternate or second-source DDR parts, given that we are seeing limited market availability for the parts referenced in the EV1 design.
4. Any DDR layout/design guidelines, reference schematics, or PHY timing/training constraints we should be aware of when selecting a DDR part different from the one used on the EV1 board.
For context, our design uses the STM32MP257F in a Cortex-A35 (OpenSTLinux) + Cortex-M33 configuration, and we are also using the STPMIC25 for power management, consistent with the EV1 reference design.
Any documentation, part numbers, or design notes you can share would be very helpful in unblocking our PCB design. Please let us know if you need any further details about our design to assist us.
Thank you for your support.
Best regards,
Radha
