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TVP5158 vs hs lock

Other Parts Discussed in Thread: TVP5158, TVP5150

我对TVP5158寄存器进行配置:单通道,D1,BT656

寄存器配置如下:

B0 = 0x00; 
B1 = 0x90;
B2 = 0x25;
B3 = 0xE4;
B4 = 0xE4;
B5 = 0x00;
B6 = 0x1B;
B7 = 0x04;

0D = 0x02;  采用CVBS Autoswitch mode,但是读到的寄存器值是

REG_STATUS1=10
REG_STATUS2=38
REG_VIDEO_STD=0
REG_VIDEO_STD_STATUS=81

发现没有REG_STATUS2中的bit7是0即 Signal is not present。这是怎么回事呢?而且VS,HS都没有锁定。是哪里出了问题呢?谢谢