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TVP5151: Vertical Blanking Interval Issue

Part Number: TVP5151

Hi

I am Using TVP5151PBSR to Decode Analog Composite Video Signals into Digital 4:2:2 YCbCr Signals with Discrete Sync Signals. TVP5151PBSR I2C Registers are Configured through STM32F413RGT6 Controller, As of Now I am Getting Digital Outputs, HSync , VSync and Field Indicating Signals. But I am Unable to Get Vertical Blanking Interval Output Even I Configure Related Registers (03h,0Fh) and Writing Vertical Balnk Interval Start and Stop Register (18h,19h). Can Anyone Please Suggest me the Reason Why Vertical Blanking Interval Signal is not Coming and Provide Appropriate Solution For The Same.

Thanks and Regards,

Manohar S