View Poll Results: which tool is monstly used for ent-to-end product

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  • cadence

    9 45.00%
  • synopsys

    11 55.00%
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  1. #1
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    why we always apply trigger to flip flops

    hello guys ,
    why we need clock edge transtion ( either fall or rise ) for design of flip-flop

    •   Alt19th December 2007, 10:20

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  2. #2
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    triggering of flip flop

    sequential circuits need to synchronous... sine async ckt's have quite a number of problems like rece conditions sync ckts are preffered over them... for this synchronous operation edge-triggering is used...


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    triggering of flip-flop

    this is the basic difference between a flip flop and a latch.

    latches are level sensitive and flip flops are edge sensitive.

    This makes the contents to be stable for entire clock pulse in flip flops

    Corect me if i am wrong


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  4. #4
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    triggering of flip-flops

    synchronous at the same time ,all the flip-flop will be triged


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    •   Alt20th December 2007, 04:26

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  5. #5
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    why we need clocks?

    hi,l have used cadence tool,but used synopsys. l will try


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  6. #6
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    whats the need of clock pulse in flip-flop

    Hi,

    If we are not using the edges, whenever the input value changes output also change accrdingly. Because of this we will get erroneous values before settling in actual value. It will make unnecessary switching and power loss. So we are narrowing the sampling window and allowing the input stable. That's why we are using edges.

    Regards,
    Kanags


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  7. #7
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    triggering flip flop

    First we need some cell to keep data. That means we need more than combinabtion logic.
    I think use edge maybe the only way to capture data, even for latch.


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    triggering of of flipflop

    Dear dude,

    To store data we must edge trigger, either on positive edge or neative.

    so only it will be understandable what data has to stored during that particular edge. mainly to synchronous data and clock to get data stored

    if it level senstive it just passes the data from i/p to o/p till it reamins high.

    Santu


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  9. #9
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    why we need clocks

    If we don't use DFF to latch data, we can't know the data process time.
    In out application, we always do some math calculation or timing control.
    If we don't use timing aspect in our design, it is always problem to real result.



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    why we need clock

    We need it b'coz otherwise it will act as an latch
    We have to consider even the setup time also



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