ADV7343 Progressive Mode settings

Hi,

  Please configure the 0x80 register for PAL because by default it will be in NTSC input. Refer below snap for your reference.

Thanks,

Poornima

Hello,

The 0x80 register is configured to PAL with 0x11 value

Can we get progressive video in SD mode?

Like in SD mode we have only two synchronization signals Vsync and Hsync,

For progressive we need Data valid signal, am I correct ?

Thanks & Regards,

Arpitha

Hi,

   For ED mode with 576P , the encoder clock will be 27 MHZ , according to table 1 am i correct ?

     Yes.

  According to the ED output configuration, as mentioned in table 38, is it we can only use DAC 1,2 and 3 for ED and HD mode output ?

      Yes, you can use DAC1/DAC2/DAC3 for ED/HD output configuration.

But in SD mode you can use upto six DACs.

Thanks,

Poornima

Hello,

Thanks for the response.

I hope you have tested ADV7343 IC in SD mode with input of resolution 576p?

Can you please confirm this,

Thanks,

Arpitha

Hi,

   No,We haven't verify the 576p in SD mode.

  Generally in SD mode we can use only the interlaced format because if you are interleaving progressive format in YCbCr it would cross the 54Mhz so in that case SD mode is not possible.

Thanks,

Poornima

Hello,
Thank you for the confirmation

So for ADV7343 none of the progressive format is tested in SD mode or have you verified 288P in SD mode?

Could you please confirm whether 288p is tested in SD mode?

Thanks,

Arpitha

Hi,

 We haven't verify this format, due to pandemic situation we can't able to verify it now.

 But as per datasheet, ADV734x can support 288p/50 Hz input and it can be configured for PAL operation, and subaddress 0x88 Bit 1 should be set to 1.

Thanks,

Poornima

Hello,

Thank you for the confirmation

288P/50 Hz input  is verified.

Thanks,

Arpitha

Hi,

  Please let us know, 288P/50 Hz is working fine in your end?

Thanks,

Poornima

Hello,

288P/50 Hz is working from our end in SD mode but some noise and slight shifts is observed in the display,
Since we do not need this resolution ,So we didn't concentrate more on it.

Thanks,
Arpitha

Hi,

 Please try to disable the PLL and check whether the noise disappears.

  If the the issue disappears with the PLL disabled is a good indicator that the problem lies in the external loop filter circuitry. The external loop filter circuit is extremely sensitive, and connecting it to an unfiltered supply will most likely in all cases lead to poor performance.

Any noise on the external loop filter circuit supply can cause an poor performance.

Please ensure with reference schematic and Is the external loop filter circuit connected directly to the PVDD supply without supply filtered (i.e EXT_LF filter parts directly to 1.8V without filter caps)

Thanks,

Poornima

Hello,

Tried to disable the PLL by enabling the bit 1 of 0x00 register, but still the same issue is observed.

Thanks,

Arpitha

Hello,

Tried to disable the PLL by enabling the bit 1 of 0x00 register, but still the same issue is observed.

Thanks,

Arpitha

Hi,

   This noise is occurring for all the formats or only with 288P/50 Hz ?

Thanks,

Poornima

Hello,

In progressive we can only test 288P/50Hz, so we observe noise is seen in this format,

where as for interlace (576i) we didn't observe any noise as observed for 288P.

Thanks,

Arpitha

Hi,

 Please make sure with below things,

   1. Have you implemented filtering on the chip supplies? In particular, is there some filtering on the PVDD supply? Noise on this supply can cause video quality to be poor.
   2. Is the encoder configured in full or low drive mode? If in low drive mode, have you low pass filtering on the output?
   3. Have you tried using a different monitor? 288p is an odd resolution that some monitors may handle differently.

Thanks,

Poornima

Hello,

I will check those points and come back to you.

Thanks,

Arpitha

Hello,

With the chipset ADV7343, facing bit of color issues.

The chip is configured to give PAL output from DAC4

Issues are :-

Red component is seen more in the output display,

colors are darken compare to the original image (example sky blue to dark blue and brown color is seen as red)

We suspect it is because of ADV7343 chipset,

Can you suggest any register set configuration to be done or checked for this.

Thanks & Regards,

Arpitha

Hello,

With the chipset ADV7343, facing bit of color issues.

The chip is configured to give PAL output from DAC4

Issues are :-

Red component is seen more in the output display,

colors are darken compare to the original image (example sky blue to dark blue and brown color is seen as red)

We suspect it is because of ADV7343 chipset,

Can you suggest any register set configuration to be done or checked for this.

Thanks & Regards,

Arpitha

Hi,

  Please let us know, other DAC's also you are facing the same issue ?

  Also which interface you are taking the output (CVBS), S-Video (YC), and component (YPrPb/RGB) analog outputs ?

Thanks,

Poornima

Hello,

We have only enabled DAC4 to transmit the PAL video out i.e. CVBS (where we are facing issue mentioned above)

DAC1,DAC2,DAC3 are enabled to transmit the RGB video, in this case what we observe at the output is the blue color is missing and yellowish over layer is seen at the output.

Thanks & Regards,

Arpitha

Hi,

 Please note that, If any impedance mis-match could also cause an color issue, so expert suggested a simple tool here that can give you a first pass estimate of what the trace impedance is for various board stack ups and trace widths. Please crosscheck with your board with impedence calculator  PCB Trace Impedance Calculator - Documents - Video - EngineerZone

Please try to configure SD chroma filter(0x80[7:5]) with different frequency and let us know whether you got any improvement.

Also make sure the below DAC output registers are configured in right way.

And ensure DAC outputs are operating in correct mode, Since DAC4 will operate only in low-drive mode.

Note: FPGA clock outputs are not very stable or accurate.  This may cause color distortion and this is why you will see all our reference designs using crystals or oscillators for the 27MHz source. 

Thanks,

Poornima

Hello,

I have enabled the internal test pattern of the encoder ADV7343 IC

This are the following configurations done:-

{0x56,0x17,0x02},
{0x56,0x00,0xFC},
{0x56,0x02,0x10},
{0x56,0x82,0xC0},
{0x56,0x84,0x40},
{0x56,0x8C,0xCB},
{0x56,0x8D,0x8A},
{0x56,0x8E,0x09},
{0x56,0x8F,0x2A},

The color bar should be white, yellow, cyan, green, pink, red, blue, black

But i am observing the following attached test patterns from DAC 4 (CVBS) and RGB from DAC 1,2,3

because of the display size the white color is not seen, but in DAC 4 we are not able to get the expected

color

Thanks & Regards,

Arpitha

  (1)From DAC4

(2)From DAC 1,2 and 3