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What is a Race-Around Condition? Explain JK Flip-Flop.

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November 5th, 2012 08:16
in Fundamentals of Information Technology by ehaab (Aquinas College (TN), Chemistry)

What is a Race-Around Condition? Explain JK Flip-Flop.

Please provide the details of a Race Around Condition. Explain the phenomenon of a JK Flip Flop?

8 Answers
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November 6th, 2012 07:25
ekadant (Belmont Abbey College (NC), Chemistry)
"A flip-flop is a bistable device, i.e. it has two states. Its output remains either high or low. The high state is 1 called SET and the low state is 0 called RESET. The JK flip flop is the most versatile flip-flop, and the most commonly used flip flop when discrete devices are used to implement arbitrary state machines. Like the RS flip-flop, it has two data inputs, J and K, and a clock input. It has no undefined states or race condition, however. It is always edge triggered; normally on the falling edge. The JK flip-flop has the following characteristics: i) If one input (J or K) is at logic 0, and the other is at logic 1, then the output is set or reset (by J and K respectively), just like the RS flip-flop, but on the (falling) clock edge. ii) If both inputs are 0, then it remains in the same state as it was before the clock pulse occurred; again like the RS flip flop. iii) If both inputs are high, however the flip-flop changes state whenever the (falling) edge of a clock pulse occurs; i.e., the clock pulse toggles the flipflop. There are two basic types of JK flip-flops. The first type is basically an RS flipflop with its outputs and ANDed together with J and K respectively. This type of JK flip-flop has no special name. Note that the connection between the outputs and the inputs to the AND gates determines the input conditions to R and S when J = K = 1. This connection is what causes the toggling, and eliminates the invalid condition which occurs in the RS flip flop. The second type of JK flipflop is called a master-slave flip flop. This consists of two RS flip flops arranged so that when the clock pulse enables the first, or master latch, it disables the second, or slave latch. When the clock changes state again (i.e., on its falling edge) the output of the master latch is transferred to the slave latch. Again, toggling is accomplished by the connection of the output with the input AND gates. The JK flip-flop is a very versatile device, and is probably the most commonly used form of flip-flop in digital electronic and control circuits. The fact that it has two inputs often means that it is simpler to design the control logic required to ensure that it changes state properly in a circuit. Source: http://in.docsity.com/en-docs/Fundamentals_of_Information_Technology__Lecture_Notes__Elveera_Miranda"

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November 6th, 2012 11:37
ekambar (Albany State University (GA), Chemistry)
"in simple jk flip flor circuit at condition j=1 and k=1 every time output toggle w.r.t previous output,we use single clock in this case so that condition known as race around condition.by using master slave jk flip flop we can remove this problem"

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November 6th, 2012 13:13
eekanath (Academy of Art University (CA), chemsitry)
"A condition in logic network in which the difference in propagation times through two or more signal paths in the network can produce an erroneous output"

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November 7th, 2012 06:18
ekani (Art Institute of Seattle (WA), Chemistry)
"If the Flip Flop is level triggered then the output will change every time the input changes. But this change in input may be due to noise. Thus at the end of noise cycle one can no longe be sure about the state of the output. It can be avoided with edge triggering. "

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November 7th, 2012 08:40
ekapad (Netaji Subhas Open University, Chemistry)
"when we put j=1 and k=1 in j-k flip flop, the output, Q toggles to 0 and 1 continuously; and it becomes uncertain to predict the output. This condition is known as Race around condition"

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November 7th, 2012 10:38
ekavir (Air Force Institute of Technology (OH), Chemistry)
"Race around condition occurs when both the input are high And the output thus undergoes a transition state.for example Consider the input values in a jk flip flop;ie;j=k=1 ,the Output q0=0 in normal case will change to 1 and vice versa"

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November 7th, 2012 11:49
ekayavan (Art Institute of Colorado (CO), Chemistry)
"in jk flip flop when clocked(clk) is at logic 1 and both inputs j&k are at logic one then ideally output of jk flip flop should be toggle but in practice output of jk flip flop is uncertain which means we cant asure any state of the output. that is 0 or 1 this happens because of clocked(clk) pulse width and such problem is known as race around condition. "

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January 31th, 2013 05:14
sanjog (Aligarh Muslim University, English literature)
"The JK flip-flop is a very versatile device, and is probably the most commonly used form of flip-flop in digital electronic and control circuits. The fact that it has two inputs often means that it is simpler to design the control logic required to ensure that it changes state properly in a circuit. "

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