Take a look at the "modified" shift-register like counter in the attached jpg file. When simulated online it behaved as expected for a divide by 5. I believe it also is self-clearing from illegal states, but the other simulator I tested that in wasn't good for documenting the design.
Bob L. > Sent: Tuesday, June 30, 2020 at 6:47 PM > From: "dschuecker" <[email protected]> > To: [email protected] > Subject: Re: [time-nuts] low power divide by 5 > > Hi, > > a divide by five should possible with a synchronous state-machine made > of 3 ( sufficiently fast-) JK-FlipFlops. > > All 3 FFs are clocked with the input freq. , the outputs of the FFs are > fed back to the the JK-inputs, the divided freq. is output of one of > the FFs. > > Additional constraints: no external ANDs or ORs or NOTs, the > state-machine does not get stuck in the 3 unused states. > > This turned out to be a very interesting problem and I do not yet come > up with a solution. Maybe there is none. Analytical solutions all > failed, I will try a brute force enumeration attack tomorrow. > > lots of fun ! > > Cheers > > Detlef
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