• 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 444

  • 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 100

  • 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 115

  • 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 226

  • 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 222

  • 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 109

  • Asynchronous and Synchronous Circuits

    In this introductory text we will define two broad classes of sequential circuits, namely; asynchronous and synchronous.• The timing of the operation of asynchronous circuits, as the name implies, is ...

    2017-11-14 14:27:28 viya 115

  • Sequential Logic Circuits: An Overview

    All of the circuits so far considered in this book have been combinational. This means that their outputs are dependent only upon the inputs at that time. We now turn our attention to sequential logic circuits whose outputs are also dependent upon past inputs, and hence outputs....

    2017-11-14 14:21:35 viya 104

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