Add on:

I don't know how the "start"/"stop" handles the clock in the actual
design. But my suggestion requires for external clock also that "stop"
disables the clock itself, or (if this is not good for some reasons)
"stop" has to disable also the divider in my example. This requires that
the separated start/stop triggers switch a Gate-like signal (like the
Start/Stop-Signal in DIN-Sync). Could be done easily with a second
RS-FlipFlop.

Florian


Florian Anwander wrote:

> Ok,
>
> I think, I've got it:
>
> The core is an RS-Flipflop, which is controlled at SET by the halftime
> clock (dived by 2) and by the the Stop trigger at RESET. The Q-Out
> controls an AND which enables the Clock:
>
> Clock---------+------------------\
> | |
> Start---Reset-x/2 \--AND
> | ...... AND----Clock to seq-counter
> \-------.S Q.--------AND
> Stop------------------.R -Q.
> ......
>
> Should work like that:
> "Stop" resets the Q to low. This disables the Clock at the Sequencer
> counter. Start resets the divider which diveds the clock. So the divided
> clock is low. At the second clock pulse the divided clock becomes high
> -> the high activates set, which enables the clok in the AND.
>
> Florian
>
>
> Florian Anwander wrote:
>
>> Hi Dieter
>>
>> we do not want to have this, because a reset while playmode would show
>> the same behaviour.
>>
>> This "wait for second step"-behaviour should only be shown if the
>> reset comes while stop mode or at the didentical moment with the
>> start-trigger. I think this requires some RS-Flipflop work...
>>
>> Florian
>>
>>
>>
>> hardware@... wrote:
>>
>>>> there are counter ICs that after receiving a reset pulse will wait
>>>> with incrementing their state untill they receive the next clock
>>>> pulse .
>>>
>>>
>>>
>>>
>>> Denis,
>>>
>>> very interesting. Can you tell me the name of this counter circuit.
>>> Maybe we
>>> could do a redesign of the A-155 controller board. Now a CD4024 is
>>> used as
>>> counter.
>>>
>>> Dieter
>>>
>>>
>>>
>>>
>>> Yahoo! Groups Links
>>>
>>>
>>>
>>
>>
>>
>

--
Florian Anwander |ConSol
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