STM32H7B3I-DK SDRAM SIZE

[ma-hara]

Hello.

I am developing a system using STM32H7A3LIH6Q with CubeIDE.
I use the SDRAM with IS42S16800J-6BLI,
I am trying to use the BSP in the firmware package STM32Cude FW_H7 V1.10.0 as it is the same as STM32H7B3I-DK.

I have a question here.

In stm32h7b3i_discovery_sdram.h of Driver-BSP-STM32H7B3I-DK in STM32Cude FW_H7 V1.10.0, it is defined with SDRAM_DEVICE_SIZE 0x800000.
Is there a reason why it should be 0x1000000 since the "IS42S16800J-6BLI" is 128Mbits?

[KDJEM.1]

Hello @ma-hara ,

I reported this issue internally.

Internal ticket number: 165785  (This is an internal tracking number and is not accessible or usable by customers).

Thank you.

Kaouthar

[Tesla DeLorean]

Does seem amiss. Looks like you could just change it, and then test that it all works.

Some of the DISCO / DK devices have historically used 32-bit wide devices, and only used the first 16-bit, resulting in half the memory being thrown away, but a cheaper / higher volume part that might have long term availability, or already in the stock-room

[KDJEM.1 · Accepted solution]

Hi @ma-hara ,

The correct STM32H7B3I-DK SDRAM Size is 0x1000000U.

This issue is solved in STM32CubeH7 1.11.2

#define SDRAM_DEVICE_SIZE         0x01000000U   /* IS42S16800F (128Mb) = 2M x16 bit x4 Banks */

Thank you for your contribution in STCommunity.

Kaouthar