Subject: Re: [stella] Read/Write bus timings... From: Chris Wilkson <ecwilkso@xxxxxxx> Date: Sun, 27 Jun 1999 03:04:06 -0400 (EDT) |
> > 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 -- Archives (includes files) at http://www.biglist.com/lists/stella/archives/ Unsub & more at http://www.biglist.com/lists/stella/
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