flipflops jk t sr d all flipflop slides
TRANSCRIPT
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Flip-Flops
• Latches are “transparent” (=> any change on the inputs is seen at the outputs immediately).
• This causes synchronization problems!
• Solution: use latches to create flip-flops that can respond (update) ONLY at SPECIFIC times (instead of ANY time).
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D FLIP-FLOP
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Flip flop can perform 3 operations
• Set the output to 1• Reset the output to 0• Complement the output
• D flip-flop can perform first two operations.
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JK Flipflop
Characteristics Equation : D = JQ’ + K’Q
J=K=0; No Change
J=1,K=0, D=1, so Q = 1
J=0,K=1, D=0, so Q = 0
J=K=1, D= Q’, so Q = Q’
•It can perform all three operations.
•It has two inputs and a clock signal.
•It makes use of D flip-flop.
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T (toggle) Flip-flop• It’s a complementing flip-flop
• It can be made using JK flip-flop or D flip-flop.
• If made using JK flip-flop– Inputs J & K are tied together– T=0, J=K=0, No Change in Q– T=1, J=K=1, Q = Q’
• If made using D flip-flop– Q = D = T XOR Q = TQ’ + T’Q
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