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 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

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

Hi,

   Please let us know your format (resolution) ?

Thanks,

Poornima

Hello,

Resolution is 720*575 @25i (STANAG RGB 3350B) 

Thanks,

Arpitha

Hi,

  Please let us know your pixel clock and also your oversampling mode(4x or 2x).

  Meanwhile let me check with expert also.

Thanks,

Poornima