Transmitting DATA using USB in STM32H743

Hi,

I am having some problem transmitting data over USB.

i'm transmitting '|' and '.' continuously but i'm missing some data when i receive data .

i'm getting like "||.|.|.|..||||.|.|"

I generated code using CubeMX. Even in reference manual there is no clear documentation for USB_CDC_FS. where can i refer to know the register details and operation of the USB.

Please someone help me in getting through this.

Thanks,

Vimal