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does 8168 support 8-bit discrete sync mode?

in 'HDVPSS_UserGuide.pdf':

my modules output bt.656, when i test embedded sync(720p60), it wors well.

but after change the module config to discrete hsync/vsync(33.75k, 30HZ), 150M, output 1080p30, the video stop after 1second, and show:
[m3vpss ] 1720083: CAPTURE: Overflow detected on VIP0, Total Resets = 1
[m3vpss ] 1720083: CAPTURE: Overflow detected on VIP0, Total Resets = 2
[m3vpss ] 1720083: CAPTURE: Overflow detected on VIP0, Total Resets = 3
[m3vpss ] 1720083: CAPTURE: Overflow detected on VIP0, Total Resets = ......

the decode also stop.

OMAP chip is TI8168 2.1, sdk is dvrrdk-3.5

and i want know where is the capture source code, how to print SAV/EAV in vpss(embeded sync)?
thanks