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Other Flip-Flop Types: J-K and T flip-flops (Section 5-6)

Other Flip-Flop Types: J-K and T flip-flops (Section 5-6). Other Flip-Flop Types. J-K and T flip-flops Behavior Implementation Basic descriptors for understanding and using different flip-flop types Characteristic tables Characteristic equations Excitation tables. J-K Flip-flop. J. K.

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Other Flip-Flop Types: J-K and T flip-flops (Section 5-6)

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  1. Other Flip-Flop Types:J-K and T flip-flops (Section 5-6)

  2. Other Flip-Flop Types • J-K and T flip-flops • Behavior • Implementation • Basic descriptors for understanding and using different flip-flop types • Characteristic tables • Characteristic equations • Excitation tables

  3. J-K Flip-flop J K Q(t + 1) Operation 0 0 Q ( t ) No change 0 1 0 Reset 1 0 1 Set 1 1 Complement Q ( t ) • Behavior • Same as S-R flip-flop with J analogous to S and K analogous to R • Except that J = K = 1 is allowed, and • For J = K = 1, the flip-flop changes to the opposite state

  4. J-K Flip-flop (continued) J C K D J K C • Symbol • Implementation

  5. T Flip-flop • Behavior • Has a single input T • For T = 0, no change to state • For T = 1, changes to opposite state • Same as a J-K flip-flop with J = K = T

  6. T Flip-flop (continued) T C D T C • Symbol • Implementation

  7. Basic Flip-Flop Descriptors • Used in analysis • Characteristic table - defines the next state of the flip-flop in terms of flip-flop inputs and current state • Characteristic equation - defines the next state of the flip-flop as a Boolean functionof the flip-flop inputs and the current state • Used in design • Excitation table - defines the flip-flop input variable values as function of the current state and next state

  8. D Flip-Flop Descriptors D Q(t 1) Operation + 0 0 Reset 1 1 Set Operation Q(t +1) D 0 0 Reset 1 1 Set • Characteristic Table • Characteristic Equation Q(t+1) = D • Excitation Table Defines next state in terms of flip-flop inputs and current state Defines next state as a Boolean function of flip-flop inputs and current state Defines input variable values as function of current state and next state

  9. T Flip-Flop Descriptors • Characteristic Table • Characteristic Equation Q(t+1) = T Å Q • Excitation Table + T Q(t 1) Operation 0 ( t ) No change 1 Q ( t ) Complement Q(t 1) T Operation + Q ( t ) 0 No change Q ( t ) 1 Complement

  10. T Flip-Flop Descriptors + T Q(t 1) Operation Q 0 ) No change 1 ) Complement Q • Characteristic Table • Characteristic Equation Q(t+1) = T Å Q • Excitation Table Defines next statein terms of flip-flopinputs and current state ( t ( t Defines next state as a Boolean function of flip-flop inputs and current state Q(t T Operation 1) + Defines input variable values as function ofcurrent state and nextstate Q ( t ) 0 No change Q ( t ) 1 Complement

  11. S-R Flip-Flop Descriptors Q(t) Q(t+ 1) S R Operation 0 0 0 X No change 0 1 1 0 Set 1 0 0 1 Reset 1 1 X 0 No change • Characteristic Table • Characteristic Equation Q(t+1) = S + R Q S R Q(t + 1) Operation 0 0 Q ( t ) No change 0 1 0 Reset 1 0 1 Set 1 1 ? Undefined

  12. J-K Flip-Flop Descriptors J K Q(t + 1) Operation 0 0 Q ( t ) No change 0 1 0 Reset 1 0 1 Set 1 1 Complement Q ( t ) • Characteristic Table and Equation Q(t+1) = J Q + K Q • Excitation Table 1) Q(t) Q(t J K Operation + 0 0 0 X No change 0 1 1 X Set 1 0 X 1 Reset 1 1 X 0 No Change

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