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 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 ---------------------------------------------------------------------------------------------- Archives (includes files) at http://www.biglist.com/lists/stella/archives/ Unsub & more at http://www.biglist.com/lists/stella/
Current Thread |
---|
|
<- Previous | Index | Next -> |
---|---|---|
Re: [stella] The heart of darkness., John Saeger | Thread | Re: [stella] The heart of darkness., Frank Palazzolo |
Re: [stella] The heart of darkness., John Saeger | Date | [stella] Gunfight 2600: Final Relea, Manuel Polik |
Month |