lecture19 - CMPT 150 Sequential Circuits Page 1 CMPT 150...

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CMPT 150 Sequential Circuits Page 1 Sequential Circuit Behaviour b A sequential circuit is: b A combinational circuit with memory or state b Flip-flops are it’s memory (one per bit) b b We describe it using: b Truth-table, boolean functions, or logic diagram for the combinational part b Inputs: b Outputs: b Finite state machine for sequential part b Lists all possible states (memory settings) b CMPT 150 Sequential Circuits Page 2 Understanding a Sequential Circuit D Q C A D A D Q C B D B 1. Determine the flip-flop equations: CMPT 150 Sequential Circuits Page 3 Understanding a Sequential Circuit 2. State Table: 3. Draw state diagram: Q(t) B Q(t+1) B A B A 0 0 0 1 1 0 1 1 CMPT 150 Sequential Circuits Page 4 Another Example D Q C X A A’ D A D Q C B B’ Y D B
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CMPT 150 Sequential Circuits Page 5 Example - State Table Present State Input Next State Output CMPT 150 Sequential Circuits Page 6 Example - State Diagram CMPT 150 Sequential Circuits Page 7 Sequential Circuit Design Procedure b Specification
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lecture19 - CMPT 150 Sequential Circuits Page 1 CMPT 150...

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