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Proof of Video Life

A project log for VGAtonic

CPLD-flavored VGA Video card

PKPK 08/05/2014 at 03:250 Comments

Today's update is one of those "it's really coming together" type updates.

Since you're reading text and you'll probably scroll down anyway, let me blow the surprise: it's VGA and NTSC test patterns.  On a 64 macrocell CPLD.  From a single, 3.5795454 MHz clock source.

Here's what you'll need to build it:

My code, conveniently located on the Git Repository for VGAtonic and MIT'd for your consumption: https://github.com/dqydj/VGAtonic/tree/master/ColorTest

PLL:

VGA:

NTSC:

And the NTSC/VGA resistor ladder DAC detail:

I've got it on a beast of a breadboard - one of those 4 column deals.  Here's what it looks like:

Some notes:

Hope someone finds this useful!

I'm sufficiently confident now that VGAtonic is realistic - I'll be designing the PCB next, and I'll throw together the framebuffer code at the same time.

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