STM32F769I based custom board USB HS PORT enumeration stage

[Tp_it]

We are using custom board based on STM32F769I.i am trying to bring up USB HS port (connected 8gb flash drive using otg cable to HS port).I have configured HSE as 25MHZ ,and

 RCC_OscInitStruct.PLL.PLLM = 25;

 RCC_OscInitStruct.PLL.PLLN = 336;

 RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;

 RCC_OscInitStruct.PLL.PLLQ = 7;

so that USB is 48MHZ.

and usb ULPI is powered on "USB_ULPI_PWR_ON" from controller as GPIO OUTPUT.

We have reached till enumeration stage(attached screenshots of relevant values and USB section of custom board).

what could be the possible reasons it is not going beyond enumeration stage.

Can someone guide in right direction.