The problem of VCI.

I use TPG->CVO,it worked correctly.Then I tried CVI->CVO,I just saw a stable green screen whether PAL signal connected.

The defaut parameter of PAL I loaded.

The vid _clk of CVI I use 27Mhz LLC form saa7113 via PLL megacore.vid_datavalid connected to RTS0 of saa7113,vid_locked conntected to VCC,vid_data connected to VPO[7..0].

who tell me what happened?Thanks a lot.