how can you get rid of the indeterminate states in clocked R-S flip-flop.Discuss
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Explanation:
The basic building bock that makes computer memories possible, and is also used in many sequential logic circuits is the flip-flop or bi-stable circuit. Just two inter-connected logic gates make up the basic form of this circuit whose output has two stable output states. When the circuit is triggered into either one of these states by a suitable input pulse, it will ‘remember’ that state until it is changed by a further input pulse, or until power is removed. For this reason the circuit may also be called a Bi-stable Latch.
The SR flip-flop can be considered as a 1-bit memory, since it stores the input pulse even after it has passed. Flip-flops (or bi-stables) of different types can be made from logic gates and, as with other combinations of logic gates, the NAND and NOR gates are the most versatile, the NAND being most widely used. This is because, as well as being universal, i.e. it can be made to mimic any of the other standard logic functions, it is also cheaper to construct. Other, more widely used types of flip-flop are the JK, the D type and T type, which are developments of the SR flip-flop and will be studied in Modules 5.3 and 5.4.
SR-ff-low-activated.gif
Fig. 5.2.1 Fig 5.2.1 SR Flip-flop (low activated)
The SR Flip-flop.
The SR (Set-Reset) flip-flop is one of the simplest sequential circuits and consists of two gates connected as shown in Fig. 5.2.1. Notice that the output of each gate is connected to one of the inputs of the other gate, giving a form of positive feedback or ‘cross-coupling’.
The circuit has two active low inputs marked S and R, ‘NOT’ being indicated by the bar above the letter, as well as two outputs, Q and Q. Table 5.2.1 shows what happens to the Q and Q outputs when a logic 0 is applied to either the S or R inputs.
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