Example: Modulo-4 Counter

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A-70 <strong>Example</strong>: A Vending Machine Controller Appendix A: Digital Logic • <strong>Example</strong>: Design a finite state machine for a vending machine controller that accepts nickels (5 cents each), dimes (10 cents each), and quarters (25 cents each). When the value of the money inserted equals or exceeds twenty cents, the machine vends the item and returns change if any, and waits for next transaction. • Implement with PLA and D flip-flops. Principles of Computer Architecture by M. Murdocca and V. Heuring © 1999 M. Murdocca and V. Heuring
A-71 Appendix A: Digital Logic Vending Machine State Transition Q/110 A dime is inserted Diagram N/100 D/110 A 0 ¢ N/000 Q/101 B 5 ¢ D/000 Q/111 D 15 ¢ Q/111 D/100 1/0 = Dispense/Do not dispense merchandise D/000 N/000 C 10 ¢ 1/0 = Return/Do not return a nickel in change 1/0 = Return/Do not return a dime in change N/000 N = Nickel D = Dime Q = Quarter Principles of Computer Architecture by M. Murdocca and V. Heuring © 1999 M. Murdocca and V. Heuring
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Page 5 and 6: A-63 RESET r(t) 0 0 0 0 1 1 1 1 App
Page 7 and 8: A-65 Appendix A: Digital Logic Exam
Page 9 and 10: A-67 Appendix A: Digital Logic Sequ
Page 11: A-69 0 x 1 x 1 x 1 0 CLK Appendix A
Page 15: A-73 Appendix A: Digital Logic PLA

Example: Modulo-4 Counter

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