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Altera_Forum's avatar
Altera_Forum
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13 years ago

Advanced Synthesis Cookbook - VGA example question

Hello,

I've been looking at the Advanced Synthesis Cookbook at:

http://www.altera.com/literature/manual/stx_cookbook.pdf

There's an output named "request" what is this and what pin is it connected to? I can't find any info on it in my DE2 user guide or any website's I've searched. The ADV7123 datasheet doesn't have any info on it either.

Does anyone know?

Thanks

2 Replies

  • Altera_Forum's avatar
    Altera_Forum
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    13 years ago

    It wouldn't be used for the interface out to the display, it looks like a debug/hint signal to me. It's been a really long time since I worked with VGA but I think that signal asserts after the last pixel on the screen is sent and remains asserted until the next frame starts (I could be wrong). The only signals you need to connect to the display interface are these (some displays don't need all of those):

    output [9:0] vga_r, vga_g, vga_b;

    output vga_hs, vga_vs, vga_blank, vga_clock;
  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    13 years ago

    I had suspected as much but wasnt sure. Thanks for your input. I can finally move on! Man, would a comment or two hurt?