• Implementation of The Steering Logic

    Since for this type of counter in general we need the input to the nth T-type used to construct the circuit to be TN=Q0 *Q2*…QN-1, = TN-1* QN-1 it is clear there are two ways in which the steering logic can be generated....

    2017-11-22 18:28:38 viya 98

  • Mod-277 Synchronous Counters

    Synchronous binary counters are arguably the simplest sequential synchronous circuits. They use the flip-flops to store the circuit's count state and (usually) have no external inputs. Thus the next state (count) is determined solely by the last state (count). We again initially take an intuitive look at mod-N counters....

    2017-11-22 18:27:22 viya 92

  • Mod-N Asynchronous Counters

    A mod-W (or divide-by-N) asynchronous counter, where N=T, will count up to (N- 1) (an output of all 1’s) before resetting to all 0*s and beginning the count sequence again....

    2017-11-22 18:25:02 viya 92

  • What is Asynchronous Counters?

    The output of a T-type flip-flop with T=) will simply toggle every time it is docked. So the circuit in Fig. 7.1 constructed from negative edge triggered T-type flip-flops will give the waveforms shown. Note that each flip-flop is clocked by the output from the preceding flip-flop with all flip-flop inputs tied HIGH so they toggle....

    2017-11-22 18:18:55 viya 88

  • Asynchronous and Synchronous Counters

    Counters are one of the most widely used logic components in digital electronic circuits. In addition to simply counting they can be used: to measure time and frequency; increment memory addresses; and divide down clock signals amongst a host of other applications....

    2017-11-22 18:17:03 viya 108

  • The Introduction of Flip-flops and Flip-Flop Based Circuits

    Flip-flops' are vital ingredients in all except purely combinational logic circuits and are therefore extremely important. The SR (Set-Reset) flip-flop was introduced in the last chapter and illustrates an important point, namely that all flip, flops are asynchronous sequential logic circuits....

    2017-11-17 17:48:44 viya 163

  • What is Switch Debouncing?

    All mechanical switches will ‘bounce’ when closed which means the contacts do not make immediate firm contact. The consequence of this is that the actual voltage from the switch oscillates when contact is made....

    2017-11-16 17:37:29 viya 149

  • Introduction to Asynchronous Sequential Circuits

    The ‘memory’ of previous outputs in an asynchronous sequential circuit is provided by direct feedback from the internal output(s), Y, to the internal input(s), of the combinational logic block (see Fi...

    2017-11-14 14:29:26 viya 100

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