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why AD9880 output total resolution video?


               we are now using ad9880 to capture analog video,we meet a problem here,

                when we input 1204X768@60HZ( xga ) video into ad9880, and configured ad9980 as xga mode,we detect the ad9880 output resolution is

               1342X806,and on the monitor display,black border around the image.

                and we look over some protocals,know that 1342X806 is total line width and total frame height of 1204X768 ,

                so,we want to know,why ad9880 output total resolution instand of active resolution?

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