decode a pal video 720 x 576 input abnormal

Hi,

  Some of your register configuration seems different from the reference one So please use configuration according to our reference script and let us know the result.

42 17 41; Enable SH1
42 52 CD; SE_CVBS AFE IBIAS
42 04 07; Power-up INTRQ, HS & VS pads

By default, the ADV718x video decoders receive analog video and output digital video in accordance with the ITU-R BT.656-3 standard.
If the receiver system is expecting an ITU-R BT.656-4 output from the ADV718x then this can result in 10 lines of black video being output at the screen.

Thanks,

Poornima

Hi Poornnima,

thanks for your reply

i do the test after modify three register:

reg[17] = 0x41

reg[52] = 0xcd

reg[04] = 0x07 or reg[04] = 0x87  

"If the receiver system is expecting an ITU-R BT.656-4 output from the ADV718x then this can result in 10 lines of black video being output at the screen", according to the reg4.bit7 description(set reg[04] = 0x07 or reg[04] = 0x87 ), but the result is same, there is no obvious difference

follow list the all register :

by the way, 

42 17 41; Enable SH1
42 52 CD; SE_CVBS AFE IBIAS
42 04 07; Power-up INTRQ, HS & VS pads

what is the mean of number '42' above.  sorry, i am not familiar with the datasheet

another question:

when i change main map register 31 34 35 to adjust HSB HSE parameters ,the display looks does't work

Is it necessary to config other register make this parameters valid ?

Thanks

Hi,

 Kindly make sure with crystal clock (i.e) you are providing correct XTAL 28.6363,and your script selects 28.63636 crystal.

 Normally sinks would expect the correct timing. It depends on how the sink interprets the incoming timing.  If the sink thinks the Hsync back porch is only 10 pixels wide and the source is outputting a back porch of 100 pixels then we will get a 90 pixel black bar on the left side of the screen.