Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

Modify NEEK "Hardware Design Examples that support VGA"

Hello,

I have extended my NEEK system with the dma_splitter and vga16_controller of the following NEEK example: Hardware Design Examples ( http://www.nioswiki.com/@api/deki/files/13/=neek_standard_ddr_vga_mirror_design_example.zip ).

I kept the default vga parameters and clk (200MHz) as stated in the example description.

Now when I'm running my system on the NEEK board, the image won't show correct on my monitor due to wrong (?!) vga timings.

I also tested it with VESA VGA timings but had no success either.

Got someone to work the vga example properly or experienced this problems?

I would like to keep the idea of the NEEK video pipeline, but the final component of the pipeline (avalon_video_sync_generator) can't control a vga display as I know (no composite sync output).

Has someone an idea how to get the video pipeline to control a vga display?

I would be very grateful for some hints.

- D.

3 Replies

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

    Hi,

    --- Quote Start ---

    I kept the default vga parameters and clk (200MHz) as stated in the example description.

    Now when I'm running my system on the NEEK board, the image won't show correct on my monitor due to wrong (?!) vga timings.

    I also tested it with VESA VGA timings but had no success either.

    --- Quote End ---

    Please refer the manual

    lcd_multimedia_hsmc_reference_manual.pdf

    from pp.2-26 to 2-28, and set the parameters of video sync generator adequately. Be careful that you must supply the appropriate pixel clock, for example, 25MHz for the VGA(60Hz) 640 * 480 resolution mode.

    --- Quote Start ---

    I would like to keep the idea of the NEEK video pipeline, but the final component of the pipeline (avalon_video_sync_generator) can't control a vga display as I know (no composite sync output).

    --- Quote End ---

    VGA_SYNC <= VGA_HS & VGA_VS;

    --- Quote Start ---

    No one tested the examples before?

    --- Quote End ---

    This Nios Linux distri. is almost incomplete .

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

    Thanks a lot, got the NEEK to control the VGA with the video_sync_generator.