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STM32H743VIT6's system boot for USART1 application issue between version Y & V.

Associate III

Hi all,

I have happened a strange problem about the system boot load of USART1 and used PB14 & PB15 different with version Y and V.

Follow up AN2606 & AN3155 documents, we have to send two synchronization bytes for USART1. However, version Y that it need send two byte to synchronization, but version V that it need only one byte. After that, both version can acknowledge byte of 0x79 to computer. I don't know why it have a compatible issue for difference versions. Have someone ever happened the same questions? How can I solve this problem?