On Mon, 14 Jun 1999, Mark De Smet wrote:
>
> The stella manual has nice timing diagrams indicating the read and write
> bus cycles, but they are missing the actual pulse widths and such. I know
> that the stella manual was intended for software people to understand...
Damned software guys...makin' the world a colder place. :)
> 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... ;)
> Specifcally, how fast does an eprom need to be to be used on the bus(in a
> cart)? Is 450ns fast enough?
That's probably fast enough, if you're not wasting time decoding
addresses, creating write pulses, and such. But I would recommend
250ns as a slow-end maximum. 150ns parts (even 100ns!) are pretty
cheap these days.
> What speeds have people used?
I have used 250ns 2716's and 2732's. I use 150ns parts in the 16k
boards...
-Chris
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