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

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CMPT 150 Sequential Circuits Page 1 Sequential Circuit Behaviour box5 A sequential circuit is: box5 A combinational circuit with memory or state box5 Flip-flops are it’s memory (one per bit) box5 box5 We describe it using: box5 Truth-table, boolean functions, or logic diagram for the combinational part box5 Inputs: box5 Outputs: box5 Finite state machine for sequential part box5 Lists all possible states (memory settings) box5 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) A B Q(t+1) A B 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 box5
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