LTDC Interface Issue with STM32H7S7I8T6 and SDRAM

[Bharathkumar]

I am currently working with the STM32H7S7I8T6 microcontroller and have selected IS42S16400N-7TL as the external SDRAM.

I would like to interface both SDRAM and an LTDC display with this MCU. However, I’m facing issues because some of the required pins are not available—they are multiplexed (used for dual functions). This is creating a complex configuration problem.

My question is:

• Is it possible to use the same pins for both SDRAM and LTDC functions by synchronizing their usage?
• Can STM32H7S7I8T6 handle such dual-function pin usage without conflicts?
• What is the recommended configuration or workaround for interfacing SDRAM and LTDC simultaneously without pin conflicts?
  Note: The functions RAS (Row Address Strobe) and CAS (Column Address Strobe) are not available in this datasheet.
  If any alternative functions are provided, please mention them.

I need stable SDRAM access for frame buffering and display refresh.

Kindly provide detailed guidance and suggestions to help resolve this issue.

Pin mapping Sheet attached in the attachment.

[Slawekkac]

Hi,

Please see my application and report from quick project with LTDC and SDRAM 16-bit (1 Meg Bits x 16 Bits x 4 Banks). I do not have any conflict.

Regards

[Bharathkumar]

If you have any reference schematic diagrams related to this SDRAM test report, please share them.