Then I use HAL_HCD_HC_GetXferCount (trough default implementation in USBH_LL_GetLastXferSize) for out pipes after successful complete USBH_BulkSendData and USBH_LL_GetURBState) - transferred size is zero for non-empty transfers.my case:STM32F746, USB...

Can anybody say meaning of four values in ACSR field of DDRPHYC_ACIOCR register?May ill ddr3-equipped board work more stable (i think) if I add no-zero values here...