System logistic functions in synchronous design

Q.  Which among the following should not be used on clocked elements to perform operational system logistic functions due to high noise susceptibility especially in synchronous design practices?
- Published on 24 Sep 15

a. Synchronous Preset & Reset
b. Asynchronous Preset & Reset
c. Both a and b
d. None of the above

ANSWER: Asynchronous Preset & Reset

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    Discussion

  • Satyawati Patil   -Posted on 09 Oct 15
    Generally, asynchronous presets and resets are highly susceptible to noise. Therefore, as the system clock clocks the clocked elements, i.e. in accordance to synchronization of clocked elements,there is no necessity and major role of asynchronous preset and reset especially when the system is totally synchronized.

    Hence, it is worthless of using asynchronous presets and resets on clocked elements for performing system logic functions due to their high susceptibility to noise.

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