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Altera_Forum's avatar
Altera_Forum
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14 years ago

VIP Suite Clocked Video Input/Output Sync Problem

Hi

I'm a newbie trying to use the Video and Image Porcessing Suite with the Altera Cyclone III Development Board (EP3C120F780C7) and the Bitec HSMC DVI interface.

I tried to get color bars on a screen with this design :

Test Pattern Generator -> Clocked Video Output : it works.

The parameters for the CVO are : for 1280x720p@60Hz

1280x720

hor sync. : 128 pixels

hor front porch : 64 pixels

hor back porch : 192 pixels

ver sync : 5 lines

ver front porch : 3 lines

ver back porch : 20 lines

My problem is :

I am using the analog interface AD9981 (from Analog Devices) to convert analog video signal to digital video signal.

My design is :

Clocked Video Input -> Clocked Video Output

The AD9981 is configured to work in 720p@60Hz and i keep the same parameters as my first design for the CVO, but I get nothing on screen.

It seems that there is a problem with the horizontal sync output : there are only 14 lines for the vertical back porch although I put 20 lines in the "vertical back porch" parameter

Can anyone help me please!!

Thanks!

Dath

4 Replies

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    12 years ago

    Hi Dath

    You should check about In/Out Vid Clock diffrence.

    Are you using same clock?

    If In/Out clock different, It require Frame Buffer in VIP. Good Luck to you!!
  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    12 years ago

    Hi dath,

    I am trying create Test Pattern Gen -> CVO. I connected

    vga_clocked_video_vid_clk(clk_25), // vga_clocked_video.vid_clk

    vga_clocked_video_vid_data(rgb_data), // .vid_data

    vga_clocked_video_underflow(), // .underflow

    vga_clocked_video_vid_datavalid(vid_datavalid), // .vid_datavalid

    vga_clocked_video_vid_v_sync(v_sync), // .vid_v_sync

    vga_clocked_video_vid_h_sync(h_sync), // .vid_h_sync

    vga_clocked_video_vid_f(), // .vid_f

    vga_clocked_video_vid_h(), // .vid_h

    vga_clocked_video_vid_v()

    Then assigned it to VGA pins

    assign VGA_SYNC_n = 1'b1;

    assign VGA_R = rgb_data[23:16];

    assign VGA_G = rgb_data[15:8];

    assign VGA_B = rgb_data[7:0];

    assign VGA_BLANK_n = vid_datavalid;

    assign VGA_CLK = !clk_25;

    assign VGA_HS = !h_sync;

    assign VGA_VS = !v_sync;

    But it still didnt work. Can you tell me where I should reconnect?

    I would appreciate your help!!