the Parameters of CVO with BT.656 format

HI,everybody

Here is a problem about CVO.I'm trying to connect CVO with SAA7121 encoder(BT.656 PAL).But it does't work Normally,looks like Synchronization problems.

The list following gives parameters what I use.The CLK of CVO is 27Mhz from SAA7113 's LLC PIN.Quartus 10.0

Please checking and give me a hand. Thanks a lot!

Image Data Format

image width 720 pixels

image height 576 pixels

bits per pixel per color plane 8 bit

number od color planes 3

color plane transission format s sequence|

interlaced video yes

Syncs Configuration

syncs signals embedded in video

active picture line 23

ancillary packet insertion line 8 (not sure,what's mean?)

Embedded Syncs Only -Field 1

horizontal blanking 144 pixel

vertical blanking 24 lines (not sure)

Interlaced and Field 0 Paramenters

F rising edge line 313

F falling edge line 1

vertical blanking rising line 311

ancillary packet insertion line 321

Embedded Syncs Only -Field 0

vertical blanking 25 lines

Gerneral Paramenters

pixel fifo size 720 pixels

fifo level at which to startoutput 719 pixels