ADV7403 register configuration for STANAG 3350 CLASS B/C Video Signals

Hi,

  Please refer this configuration script  " ##SCART RGB## "(:SCART RGB IN In Thru CP YPrPb 2X1  8Bit 422 Out through Encoder)  in that don't use CVBS connection in the AIN pin and follow the remaining configuration w.r.t reference script

 SOG register related configuration are provided in ADV7403 manual & adjust the sync slicer to use SOG.

 Also use registers 0xC3 & 0XC4 for configuring the AIN1,AIN2,AIN3 and crosscheck this configuration(ADC SWITCH) in Page 277.

Thanks,

Poornima

Hi,

Thank you for your response.

I want to understand, If I use Ain1, Ain2, and Ain3 using C3 and C4 registers, how ADV7403 understands that Ain1 is G, Ain2 is B and Ain3 is R? With the script given, is it possible that the Chip will recognize Ain1 as G, Ain2 as B and Ain3 as R? Is there any specific settings to be done in order to give RGB properly to the chip?

Thank you.

Hello,

Thank you for the script

Following are the observations:-

Test case 1:-

When I configured all the register with same value mentioned in the above script ,except the 0xC9 to 0x00 (because we need it in SDR mode)

Here the status is CP is in free running mode

Test case 2:-

When I configure all the registers as mentioned above I get a colored output (far better then before but not a cleared one), but in this case the chip is configured to DDR mode, where as we need it in SDR mode

Please find the attached image of the screen output which has to be blue test pattern when no input is connected, but it shows shades of blue and green

Thanks & Regards,

Arpitha

Hello,

One observation is with the script shared , the number of pixels between SAV and EAV should have been 720, where as here it is 1440 

But according to the register configuration of primary mode and video standard, it has to be 720 pixels

Primary mode :- 0x05 :- 0x00 (SD-M)

Video Standard :- 0x06 :- 0x0B ( CP processor 720*576 @625i)

Is there any other register need to be taken care for this

Thanks & Regards,

Arpitha

Hi,

  Please let us know your Rx & Tx chip in your board.

   Let me clarify few things from your end.

  Please let me know, you are not even getting the freerun output properly?

If So,Please refer ADV7180 RSD document ADV7180_RSD.pdf  pg 10 section 3.3 for free run mode which is available at ADV7180 Design Support Files
The writes below force the ADV7180 into free-run mode. The writes must be made in the order shown below and should be performed after an Analog Devices’ recommended script. User Map
       42 0C 37  Force Free-Run mode
       42 00 XX  Force Video Standard1
       42 0D YY  Set Color Output2
-  Have you tried with general PAL/NTSC input instead of STANAG ?

Thanks,

Poornima

Hello,

Thank you for the response

The RX chip is ADV7181C and the TX chip is ADV7343

In case of STANAG input and PAL output the free run output is like the one attached in the previous reply

In case of PAL input and the PAL output , the free run output is attached below

...

Thanks & Regards,

Arpitha

Hi,

  Please note freerun nothing but "Receiver enters free run only when the TMDS clock is not detected or when the detected input format does not match the format indicated by the PRIM_MODE [3:0] and VID_STD [5:0] settings.
   For example, if input video is not present. It controls the default color insertion and causes the receiver to generate a default clock.

 If your facing issue with general PAL input & PAL output, then you need to crosscheck your schematic.

Thanks,

Poornima

Hello,

Thank you for the quick response

Will check and let you know regarding the free running mode

Would like to know the following information:-

(1) "the number of pixels between SAV and EAV should have been 720, where as here it is 1440"

Is there any other register need to be taken care for this ?

(2) In case of STANAG input, we can observe blur output and more blue color component in the output

Is this because of CSC registers? or should i need to configure the offset registers for the three channels

(3) In case of STANAG input :- I am able to get the output 8-bit YCrCb 4:2:2 in Component processor with DDR mode, but my requirement is to work with SDR mode, so I wanted to know whether this is possible or not?

Thanks & Regards,

Arpitha

Hi,

(1) "the number of pixels between SAV and EAV should have been 720, where as here it is 1440"

Is there any other register need to be taken care for this ?

   Generally we will use the 'PRIM_MODE and VID_STD' registers are setting the free run mode & leave these configuration.

(3) In case of STANAG input :- I am able to get the output 8-bit YCrCb 4:2:2 in Component processor with DDR mode, but my requirement is to work with SDR mode, so I wanted to know whether this is possible or not?

For 8bit 422 SDR mode, Please make sure with below things,
        42 6B 83 ; 422 8bit out
        42 C9 00 ; SDR mode
        42 52 00 ; Colour Space Conversion from RGB->YCrCb
As per CPOP_SEL[0:3] register configuration,if it is 83 then it will be like 16bit output, So for 8 bit output we need to configure the pixel port in below pin assignment.

   8-bit  out       YPrPb=P19-P12/P2-P9.
  16-bit out       Y= P19-P12
                          PrPb = P2-P9.

Thanks,

Poornima

Hello,

I tried with this following configuration:-

For 8bit 422 SDR mode,
        42 6B 83 ; 422 8bit out
        42 C9 00 ; SDR mode
        42 52 00 ; Color Space Conversion from RGB->YCrCb

 8-bit  out:- YPrPb =P19-P12

But ,not able to get the output in the SDR mode

I suspect because of the DDR mode the wordings are not clear because with the initial configuration where i used to get black and white output the output video was clear, only color issue was faced

Any suggestion, where any ADI settings has to be followed for the registers where the output from the decoder is 8-bit YCrCb 422 in SDR mode when the input is STANAG.

Thanks & Regards,

Arpitha

Hi,

  We basically have no scripts or support for STANAG 3350 although if you search the forums you will see several threads with suggestions for custom formats. We don't test the format or have any way to test it so what you can find on the forum is all we have to offer for STANAG 3350.

 Please note according to specification,we can configure the SDR output in below ways ,

Composite and S-Video pixel data output modes:
   - 8-/10-bit ITU-R BT.656 4:2:2 YCrCb with embedded time codes and/or HS, VS
and FIELD.
  - 16-/20-bit YCrCb with embedded time codes and/or HS, VS and FIELD.

Component pixel data output modes:
- Single data rate (SDR) 8-/10-bit 4:2:2 YCrCb for 525i and 625i
- SDR 16-/20-bit 4:2:2 YCrCb for all standards
- Double data rate (DDR) 8-/10-bit 4:2:2 YCrCb
- DDR 12-bit 4:4:4 RGB

Thanks,

Poornima

Hello,

Thank you for the support

Following are the observation when done changes with the script:-

(1)When used the script recommended by ADI (from ADV7181C_RGB_SOG.pdf)  tried to debug the 8-bit data from the decoder by capturing it in the FPGA with the help of debug probes inside the FPGA, observation was the data is sent from the decoder in SDR mode (in BT.656 format) where, the 0xC9 register was configured to 0x0C (DDR mode)

What is the 8-bit DDR mode LLC frequency?

(2)When the 0xC9 register is configured to 0x00 (SDR mode), the 8-bit data is not sent in BT.656 format

(3)We checked the CP AV control register and CP default color force register and the default color registers to get at-least the free run output, tried with forcing the default color to be blue but at the output we get a combination of all three colors(red, blue and green)

Can you suggest what can be cross checked either register setting or which part of schematic to get proper output 

Thanks & Regards,

Arpitha

Hello,

Thank you for the support

Following are the observation when done changes with the script:-

(1)When used the script recommended by ADI (from ADV7181C_RGB_SOG.pdf)  tried to debug the 8-bit data from the decoder by capturing it in the FPGA with the help of debug probes inside the FPGA, observation was the data is sent from the decoder in SDR mode (in BT.656 format) where, the 0xC9 register was configured to 0x0C (DDR mode)

What is the 8-bit DDR mode LLC frequency?

(2)When the 0xC9 register is configured to 0x00 (SDR mode), the 8-bit data is not sent in BT.656 format

(3)We checked the CP AV control register and CP default color force register and the default color registers to get at-least the free run output, tried with forcing the default color to be blue but at the output we get a combination of all three colors(red, blue and green)

Can you suggest what can be cross checked either register setting or which part of schematic to get proper output 

Thanks & Regards,

Arpitha

Hi,

 As stated above, SDR 8-/10-bit ITU-R BT.656 4:2:2 YCrCb is only possible when the ADV7181C input is Composite and S-Video.

For blue color output, Please configure the 0xBF(CP DEF COL) register as "0x02".

Thanks,

Poornima

Hello,

Wanted to know what is the 8-bit DDR mode LLC frequency in CP mode?

Thanks & Regards,

Arpitha

Hi,

  DDR mode nothing but the pixel output port can be configured in an 8-/10-/12-bit 4:2:2 YCrCb upto a clock rate of 75Mhz (i.e In DDR mode we can support maximum clock rate upto 75MHz.

  Please note DDR mode doesn't change the overall performance of the part-- DDR mode maximum would be half the SDR mode maximum.  It's really no different than SDR mode-- just half the pixel clock rate since you are getting pixels on each edge instead of every other edge. 

Note: DDR mode, a new data value is presented on the positive and the negative edge of the
LLC (line-locked clock) and, hence double the amount of data is transferred.

Thanks,

Poornima

Hello,

Wanted to know what is the DDR mode maximum and SDR mode maximum?

Thanks,

Arpitha

Hi,

  ADV7403  pixel clock can run at 140MHZ, but more than that,it will not support
  For example if you are in DDR mode the LLC is 1/2 the pixel clock rate i.e  If the pixel clock = 140MHz then DDR clock =70MHz    
   And If you are running 140MHz then you must be in SDR mode not DDR mode.  SDR has one pixel per rising edge while DDR has one pixel per rising edge and one pixel per falling edge. 

Thanks,

Poornima

Hello,

Thank you for the response.

As it is for ADV7403, it should same for ADV7181C, correct ?

DDR mode maximum and SDR mode maximum means the maximum clock supported by the chip in SDR and DDR mode

So for 8-bit of pixel data, if SDR mode the pixel clock is 27MHz then in DDR mode it is 13.5MHz

Thanks,

Arpitha

Hi,

  As it is for ADV7403, it should same for ADV7181C, correct ?

     YES, but pixel clock(LLC) will vary between ADV7403 & ADV7181C.

  So for 8-bit of pixel data, if SDR mode the pixel clock is 27MHz then in DDR mode it is 13.5MHz

     YES.

Thanks,

Poornima

Hello

Understood. Thank you

But according to our observation with respect to the ADV7181C chipset, when we configure the 0xC9 register to DDR mode and probe the LLC clock it shows 27MHz only, where as it should have been13.5MHz,

Can you suggest why is this observation?

Thanks,

Arpitha

Hi,

  Please let us know, whether you have assign the DDR bus pin as per table 51.

Thanks,

Poornima

Hello,

The data bus pin are given from P12 to P19 for 8-bit DDR mode

Attached is the capture of one of the data signal with respect to the LLC clock

Thanks,

Arpitha