1a. State diagram

• Consider input sequences

  • 3 nickels
  • nickel, dime
  • dime, nickel
  • two dimes

• Draw state diagram

  • Assume Moore machine
  • Inputs: N, D, reset
  • Output: Open

S0

Reset

N

S1

S2

S3

S4

S5

S6

S7

N

N

N

D

D

D

[open]

[open]

[open]

[open]

S8

[open]

D

Simple diagram shows

(a) state transitions

(b) changes in output

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