On Mon, 19 Nov 2001, John Saeger wrote:
> ----- Original Message -----
> From: "Chris Wilkson" <ecwilkso@xxxxxxx>
>
> > The circuit is actually pretty simple...it's a gray code counter. It
> > generates a 2 phase, non-overlapping clock. At the frequency of the 6502.
> > The 2 phase clock is generated by the 2 crosscoupled flipflops. The
> graycode
> > is generated by the 2 NOR gates.
>
> So do the clocks look like this? And how large would you suppose the delay
> is?
No, they are non-overlapping, both with 25% duty cycle.
Like this:
OSC -_-_-_-_-_-_-_-_-_-_-_-_-_-
H01 __--______--______--______-
H02 ______--______--______--___
If you're interested in the delay from the rising edge of OSC to
a change on H02 or H01, then just call it zero.
(it's a few ns vs. the 840ns period of OSC)
-Chris
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