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# tutorial8 - ERG2020A Tutorial 8 Sequential System Design...

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ERG2020A Tutorial 8 Sequential System Design

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2 What is Sequential Circuit? A synchronous sequential circuit is built from 2 parts: Memory elements: store the current state of the circuit, e.g. latches, flip-flops Combinational elements: compute the next state and outputs based on current state and inputs. Combinational elements: compute the next states and outputs based on current state and inputs. Next state function System state Output function input( t ) state( t ) state( t + 1) clock output( t )
3 State Elements: Latches, flip-flops Gated SR-Latch: control output (the state) by giving 1 to S(set) or R(reset) inputs when C = 1 SR Master-Slave Flip-flops: control output (the state) by giving 1 to S(set) or R(reset) inputs when clock edge arrives S C R Q Q S C R Q Q

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4 Timing Diagram for D Flip-flops C D Q Q
5 Flip-flop Characteristic Table J K Q(t+1) Op 0 0 Q(t) No change 0 1 0 Reset 1 0 1 Set 1 1 Q(t) Complement S R Q(t+1) Op 0 0 Q(t) No change 0 1 0 Reset 1 0 1 Set 1 1 ?? ??

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tutorial8 - ERG2020A Tutorial 8 Sequential System Design...

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