Re: Cascading 2-bit up/down counter

From: dave_m <dmercado11_at_att.net>
Date: Mon, 21 May 2018 14:21:17 -0700 (MST)
Message-ID: <1526937677265-0.post@n4.nabble.com>
> 
The CBM CMOS chip I'm working on the spec sheet in a few gates 
mentions "GATING" inputs and outputs, what does this mean exactly?
>

To have a true synchronous counter, only one common clock is used in all
stages. So to keep the upper stages from counting at the wrong count, say
instead of counting every one clock to say every 10 counts, you would use
gating signals like 'count enable' inputs and 'ripple  carry' outputs in
your design to keep things counting properly and on one common clock. This
is considered a better design rather than simple 'ripple counters' that uses
an output from the previous stage to clock the next stage. That method will
accumulate propagation delays and can cause glitches, etc in the overall
logic circuit. 



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Received on 2018-05-22 00:00:07

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