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Dr Jefyll
PostPosted: Mon Mar 17, 2014 8:15 pm 
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Visual Guide to 65xx CPU Timing

The animated "rubber band" diagrams in this article are drawn to scale (unlike most in data sheets). They offer insight into real-world timing margins and the tradeoffs between them.

Image

Comments and questions are welcome here in this forum topic. The article itself is subject to editing and re-editing if there's anything I've overlooked, and may be considered a work in progress. :) Thanks, Garth and Ed, for your advance input on what I've written so far.

-- Jeff

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https://laughtonelectronics.com/Arcana/ ... mmary.html


Last edited by Dr Jefyll on Thu Mar 27, 2014 7:04 pm, edited 3 times in total.

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Dr Jefyll
PostPosted: Mon Mar 17, 2014 8:17 pm 
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( this null post is a placeholder I may use in future :roll: )

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In 1988 my 65C02 got six new registers and 44 new full-speed instructions!
https://laughtonelectronics.com/Arcana/ ... mmary.html
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cr1901
PostPosted: Mon Mar 17, 2014 8:44 pm 
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Is this post in light of my misconceptions in the DMA thread?
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Dr Jefyll
PostPosted: Mon Mar 17, 2014 8:57 pm 
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Is this post in light of my misconceptions in the DMA thread?

No, some of these points have already been the subject of discussion. But it can be a slippery topic to deal with piecemeal. That's why I wanted to try to clear the deck and lay out the basics. As for the diagrams, I know that's how I mentally visualize timing matters myself. So I decided to render them as GIF's, on the premise that a picture is worth 1,000 words. (or 1024 words maybe!) :)

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In 1988 my 65C02 got six new registers and 44 new full-speed instructions!
https://laughtonelectronics.com/Arcana/ ... mmary.html
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clockpulse
PostPosted: Mon Mar 17, 2014 9:41 pm 
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Nice work!
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BigDumbDinosaur
PostPosted: Tue Mar 18, 2014 12:30 am 
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Looks good. Guess you were staying up past bedtime to make timing charts. :lol:

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Michael
PostPosted: Tue Mar 18, 2014 1:07 am 
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Thank you, Jeff.
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Tor
PostPosted: Tue Mar 18, 2014 8:27 am 
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Superb. Thank you!

-Tor
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Dr Jefyll
PostPosted: Wed Mar 19, 2014 4:36 am 
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Cheers, fellas -- 'ppreciate the response.

I'm pleased with how the animated GIF's turned out. I just hope they render properly in all the various browsers out there. So far the only problem I've noticed is that GIF03 makes me seasick if I watch it too long! :wink:

-- Jeff

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https://laughtonelectronics.com/Arcana/ ... mmary.html
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