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ADV7189B SFL to ADV7179 SCRESET/RTC  for Subcarrier Lock?

Question asked by ELADI on Aug 24, 2011
Latest reply on Aug 24, 2011 by FrankK

Can ADV7189B SFL drive ADV7179 SCRESET/RTC for Subcarrier Lock?


- Video ADV7189B decoder Pixel Data Out P9-P2 to ADV7179 encoder inputs P7-P0
- Encoder Input SCRESET / RTC is connected to the output of the decoder SFL.
- LLC1 output (output of 27 Mhz) of the decoder is connected to the Clock input of the Encoder.
- HSYNC; VSYNC; BLANK encoder inputs are not used.

 

With this, and setting:
a) External Control Out (B1) 1 in the encoder and MR21 = 1 and MR22 = 1 in the decoder, the output signal of the subcarrier ADV7179 is not genlocked.
b) With MR22 = 0 and MR21 = 1; chroma signal is jumping + -180 degrees permanently.

 

Is there any chance to genlock the ADV7179 subcarrier output with the input signal to the decoder?

 

(All values are in hexadecimal)


Case 1:
Encoder ADV7179
Mode Register 0 = 05
Mode Register 1 = 10
Mode Register 2 = 06
Mode Register 3 = 00
Mode Register 4 = 00
Timing Register 0 = 00
Timing Register 1 = 00
Decoder ADV7189B
Extended output control (Address 04) = C2
Resample Control (Address 41) = 50
Result: DSC_0032_2.jpg => Chroma genlock lost


Case 2:
Encoder ADV7179
Mode Register 0 = 05
Mode Register 1 = 10
Mode Register 2 = 02
Mode Register 3 = 00
Mode Register 4 = 00
Timing Register 0 = 00
Timing Register 1 = 00


Decoder ADV7189B
Extended output control (Address 04) = C2
Resample Control (Address 41) = 50
Result: Chroma is jumping +-180 degrees

Outcomes