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ADV7391 missing lines

Category: Hardware
Product Number: ADV7391

Hi. 

I am using the ADV7391 in NTSC 640X480  square pixel (YCrCb) mode.

I put signal on (line 22 to line 261) for the ODD field and from (line 285 to line 524) for the even field.

But both lines 261 and 524 are empty (see pictures below). Instead of having 2 frames of 240 lines, I have 2 frames of 239 lines.

Could you help me please to unsertand why.

Best Regards,

HHL