ST32H750VB LQFP100 Package for X16 SDRAM usage

[MBair.1]

Hi,

We were planning to use ST32H750VB (LQFP100 Package) in our design. The critical interface in our design will be SDRAM ( planning x16 bit).

But while checking pin-multiplexing details for LQFP100 package, we observed that the D[0-15] and A[0-15] are multiplexed together for LQFP100 package! But in reference manual, that gave us a different impression that data/address are shared among other memory controllers like NOR flash.

• In that case how do we connect SDRAM device (x16) with STM32H750VB (LQFP100 package specifically) ? This gave us an impression that LQFP100 package of STM32H750 does not support x16 SDRAM, Please confirm whether our understanding is correct?
• Is there such limitations for x8 bit design too (mainly on addressing) ?
• If you have any reference schematics for LQFP100 version of STM32H750, Please do share with us.

[TDK]

https://community.st.com/s/question/0D50X00009XkgFL/missing-sdram-choice-in-stm32cube-for-100-pin-package

[MBair.1]

Hi TDK,

Thanks for your response.

As suggested in the above link, we also have manually done the Pin multiplexing in a Spreadsheet. We assume that Address and data lines have been multiplexed for the LQFP-100 package (from FMC_D(0:15), which is indicated as FMC_DA(0:15) too).

As omeryaman concluded at the end of the link you have shared, it will be useful for us if we get any official confirmation from STM or from ST Employees on this.

BTW do you see same/any other concerns with 144-pin or 176-pin packages too ?

Thanks.