In addition to these two flip-flops, the circuit also includes an inverter. The output from the master flip flop is connected to the two inputs of the slave flip flop whose output is fed back to inputs of the master flip flop. Out of these, one acts as the “master” and the other as a “slave”. The Master-Slave Flip-Flop is basically a combination of two JK flip-flops connected together in a series configuration. This introduced the concept of Master Slave JK flip flop. This problem (Race Around Condition) can be avoided by ensuring that the clock input is at logic “1” only for a very short time. This problem is called race around condition in J-K flip-flop. Race Around Condition In JK Flip-flop – For J-K flip-flop, if J=K=1, and if clk=1 for a long period of time, then Q output will toggle as long as CLK is high, which makes the output of the flip-flop unstable or uncertain. Prerequisite – Flip-flop types and their Conversion ISRO CS Syllabus for Scientist/Engineer Exam.
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