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VBLK is not working.

Other Parts Discussed in Thread: TVP5150AM1, TVP5150

Hi,

I am working on a custom board which TVP5150AM1 connected to CSI port of IMX31.

I  connected AVID to CSI_HSYNC and VBLK to CSI_HSYNC.  Adjust All register to default values except the following ones;

Reg 01h = 15h // TVP5150_ANAL_CHL_CTL
Reg 03h = CFh // TVP5150_MISC_CTL
Reg 04h = 00h // TVP5150_AUTOSW_MSK
Reg 0Dh = 40h // TVP5150_DATA_RATE_SEL
Reg 0Fh = 0Eh // TVP5150_CONF_SHARED_PIN

Regarding above settings, I expect VBLK and AVID signals generated according to my VBLK and AVID Start/Stop settings. But, I only can get the AVID, not VBLK. So, CSI  of CPU could not capture any data because of no VSYNC at all. I would be very glad if somebody points out what I am missing here?