> > General question: Does anyone know the timing numbers, such as the setup
> > time for data in a read, and the hold time after the clock edge? What
> > about the bus cycle time?(1/4, 1/2 of clock?)
>
> I could probably scope them out for you, but it might take a while.
> I have 7 "official" project ahead of this one, though it's straight
> forward enough that it might get a temporarily higher spot in the
> queue... ;)
Ok Marc,
(and anyone who wants to know ;)
I had a chance last week to look at some of the internal timing of my
2600jr (NTSC). I probed A0, D0, R/W, and Phi2 (marked "CLK2" in the pix).
I got some rough timing diagrams. My scope is the digital sampling type,
(100MHz I think). So there is limited sampling resolution...and therefore,
limited measurement resolution. Also it has a thermal printer and the paper
is pretty old...so bear with me! :)
I cleaned up the images somewhat and added signal names, vertical timing bars,
and times in Xpaint. I managed to get 5 reasonable measurements which show
the various delays. The images (.GIF format) can be found at this URL:
http://www.mit.edu:8001/~ecwilkso/
Hope this is useful!
-Chris
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