[time-nuts] lunatic fringe time standards

jimlux jimlux at earthlink.net
Fri Apr 16 00:26:19 EDT 2010


Bob Camp wrote:
> Hi
> 
> The only real limit on a Johnson counter is how clever you get making sure
> that only one stage is a 1 and all the rest are zeros. There are *lots* of
> ways to take care of that, each with it's own set of trade offs. 
> 
> Bob


Of course, if your goal is "minimizing gates" or "minimizing 
transistors", particularly if you need 1 out of N decoding.. a 
ring/Johnson counter might be a better strategy than a smaller counter 
with lots of states and more complex decoding.

But, if "counting" or "addressing", then standard counters or LFSRs are 
better.  The LFSR with multiple feedback is nice because every stage is 
identical.





More information about the time-nuts mailing list