Re: [stella] The heart of darkness.

Subject: Re: [stella] The heart of darkness.
From: Chris Wilkson <ecwilkso@xxxxxxx>
Date: Mon, 19 Nov 2001 13:12:39 -0500 (EST)
On Mon, 19 Nov 2001, John Saeger wrote:

> ----- Original Message -----
> From: "Chris Wilkson" <ecwilkso@xxxxxxx>
> > The circuit is actually pretty'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)


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