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[ADV7343] External SYNC output pins in case of SD video.

Hi,

I have a question about ADV7343.

It has some SYNC pins, which are S_HSYNC(I/O), S_VSYNC(I/O), P_HSYNC(I) and P_VSYNC(I).
When ED/HD video is handled, I think we can use P_HSYNC and P_VSYNC for the external sync input and S_HSYNC and S_VSYNC for the external sync output.

In case of SD video, can the sync pins also be used for both of input and output?
If it can be done, could you tell me how to use the sync pins for that?
Or when we want to handle SD video and use the external sync output pins, do we have to use embedded syncs(EAV/SAV) input?

Thank you!
Best regards.
Tamu

  • Hi,

    In case of SD video, can the sync pins also be used for both of input and output?

     Yes,external input synchronization signals can be provided on the S_HSYNC,S_VSYNC,P_HSYNC,P_VSYNC and P_BLANK pins -Timing Synchronization signal Input Options are provided in table 54 by configuring SD -0x8A[2:0], ED/HD-0x30[2].

     It is also possible to output synchronization signals on the S_HSYNC,S_VSYNC Timing Synchronization signal Input Options are provided in table 55 to 57 by configuring 0x02.

     For more details Please refer section EXTERNAL HORIZONTAL AND VERTICAL SYNCHRONIZATION CONTROL in Page68.

    when we want to handle SD video and use the external sync output pins, do we have to use embedded syncs(EAV/SAV) input?

       If it is embedded sync it would generate H bit output on S_HSYNC and F bit output on S_VSYNC. If it is not an embedded sync input,HSYNC and FIELD are output on the S_HSYNC and S_VSYNC pins respectively.

    Thanks,

    Poornima

  • Hi,

    Thank you for your reply.

    My question is about a case of  SD video.
    "S_HSYNC" pin and "S_VSYNC" pin are I/O pin and SD Horizontal/Vertical Sync.
    "P_SYNC" pin and "P_VSYNC" pin are only Input pin and ED/HD Horizontal/Vertical Sync.
    Please see "Table 15. Pin Function Descriptions" as follows:

    So I think that "P_SYNC" pin and "P_VSYNC" pin are not used for SD video but for ED/HD video.

    >In case of SD video, can the sync pins also be used for both of input and output?
    >Yes,external input synchronization signals can be provided on the S_HSYNC,S_VSYNC,P_HSYNC,P_VSYNC and P_BLANK pins

    =>Even if SD video is input, do you mean that "P_SYNC" pin and "P_VSYNC" pin can be used for Sync Input and "S_HSYNC" pin and "S_VSYNC" pin are used for Sync Output?
      I asks this question because the datasheet "Table 15" describes "P_SYNC" pin and "P_VSYNC" pin seem to be used for only ED/HD Horizontal/Vertical Sync Input.

    Thank you!
    Best regards.
    Tamu

  • Hi,

     Yes, S_HSYNC S_VSYNC pins are only used for SD Mode.it can be configured as both input and output, but not as simultaneously.

     For example - Master/Save Mode -The HSYNC /VSYNC are output in master mode and HSYNC /VSYNC input in slave mode on the S_HSYNC and S_VSYNC(I/O) pins respectively, but not as simultaneous.

     I just said example, with above pins(S_HSYNC,S_VSYNC,P_HSYNC,P_VSYNC) can be used as an input pin when external synchronization signals are used. "P_HSYNC" and "P_VSYNC" are Input pin and it can be used only with ED/HD mode.

    Note: SD and ED/HD timing synchronization outputs must be disabled (Subaddress 0x02[7:6] = 00), When SD/ED/HD timing Synchronization Signal is used as an input.

    Thanks,

    Poornima

  • Hi,

    Thank you for your reply.

    I understood as follows:
    In case of SD video, the sync pins of ADV7343 can not be used for both of input and output.
    When we want to handle SD video and we want to use the external sync output pins, ADV7343 has to be used as embedded syncs(EAV/SAV) input.
    Is these right?
    If there is any misunderstanding, please let me know.

    Thank you!
    Best regards.
    Tamu

  • Hi,

     When we want to handle SD video and we want to use the external sync output pins, ADV7343 has to be used as embedded syncs(EAV/SAV) input. Is these right?

       No, You can use either pixel data input or embedded syncs input. Then you can derive external sync output (HSYNC and VSYNC ) on S_HSYNC and S_VSYNC pins.

    Thanks,

    Poornima

  • Hi,

    Thank you for your reply.

    When we want to derive external sync output (HSYNC and VSYNC) in S_HSYNC and S_VSYNC pins of ADV7343 for SD video,
    I think we can not use any other sync pins as external sync input.
    Is this right?

    Thank you!
    Best regards.
    Tamu

  • Hi,

     I think we can not use any other sync pins as external sync input.
     Is this right?

       Yes.

    Thanks,

    Poornima

  • Hi,

    Thank you for your reply.

    So, when we want to derive external sync output (HSYNC and VSYNC) in S_HSYNC and S_VSYNC pins of ADV7343 for SD video,
    I think we have to use embedded syncs(EAV/SAV) input. (Because can not use any other sync pins as external sync input.)
    Is this right?

    Thank you!
    Best regards.
    Tamu

  • Hi,

     I think we have to use embedded syncs(EAV/SAV) input. (Because can not use any other sync pins as external sync input.)
     Is this right?

      Yes,Embedded syncs include H, V, F (field) and also parity bits.

    Thanks,

    Poornima