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ADV7181C in YPBPR 1080i mode : no pixel on output

Question asked by csamoyeau on Jun 24, 2013
Latest reply on Jul 1, 2013 by yimiqiba

Hello,

 

We use the ADV7181C component on our board in PAL mode and it works since a long time.

 

Now we would like to use this component to decode 1080i analog YPbPr video.

I found the following setting on Analog Device web site:

 

##CP 1080i##

:1080i/60Hz YPrPb In 20Bit 422 HS/VS Encoder:

42 05 01 ; Prim_Mode =001b COMP

42 06 0C ;VID_STD for 1080i

42 C3 46 ; ADC1 to Ain4, ADC0 to Ain6,

42 C4 B5 ; ADC2 to Ain5 and enables manual override of mux

42 1D 47 ; Enable 28MHz Crystal

42 3A 21 ; set latch clock settings to 010b, Power Down ADC3

42 3B 81 ; Enable Internal Bias

42 3C 5D ; PLL_QPUMP to 101b

42 6B 81 ; 422 20bit OUT

42 C9 00 ; SDR

42 73 CF ; Enable Manual Gain and set CH_A gain

42 74 A3 ; Set CH_A and CH_B Gain - 0FAh

42 75 E8 ; Set CH_B and CH_C Gain

42 76 FA ; Set CH_C gain

42 7B 1D ; TURN OFF EAV & SAV CODES Set BLANK_RGB_SEL

42 7C 93 ; set HS position/ HS Polarity - positive

42 7D D4 ; set HS position

42 7E 2D ; set HS position

42 85 19 ; Turn off SSPD and force SOY. For Eval Board.

42 86 1B ; Enable stdi_line_count_mode

42 B7 1B ; use internal VS width for fixing VS vibration

42 BF 06 ; Blue Screen Free Run Colour

42 C0 40 ; default color

42 C1 F0 ; default color

42 C2 80 ; Default color

42 C5 01 ; CP_CLAMP_AVG_FACTOR[1-0] = 00b

42 F4 3F ; Max Drive Strength

42 0E 80 ; ADI Recommended Setting

42 52 46 ; ADI Recommended Setting

42 54 00 ; ADI Recommended Setting

42 57 01 ; ADI Recommended Setting

42 F6 3B ; ADI Recommended Setting

42 0E 00 ; ADI Recommended Setting

 

I can't get pixels and the status register 0x12 output C0 meaning that CP_FREE_RUN is equal to 1 and TLLC_PLLLOCK is equal to 1.

I have checked the board schematic and I didn't find something wrong. The video input signal seems correct (i tried it on a TV).

Can somebody give me some ideas to continue my investigations?

 

rgds,

 

Christian

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