On Mon, 19 Nov 2001, John Saeger wrote:
> In any case, the two scans that I've posted show how the H01 and H02 signals
> are generated. I'd be curious to know if somebody could tell me what they
> think the waveforms of H01 & H02 would look like. Are they square waves?
> How does the phase relate to the input? What kind of propagation delay has
> been introduced by the rather elaborate circuit used to generate them?
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.
-Chris
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