EECS20N: Signals and Systems

Update Table

The update table gives the next state and the output as a function of the current state and the input:

current state

current input

ring

offhook

end greeting

 end message

absent

idle

(count1, absent)

(idle, absent)

(idle, absent)

(idle,
absent)

(idle,
absent)

count1

(count2, absent)

(idle, absent)

(idle, absent)

(idle,
absent)

(count1, absent)

count2

(play greeting,
answer)

(idle, absent)

(idle, absent)

(idle,
absent)

(count2, absent)

play greeting

(idle,
absent)

(idle, absent)

(recording, record)

(idle,
absent)

(play greeting, absent)

recording

(idle, recorded)

(idle, absent)

(idle, recorded)

(idle, recorded)

(recording, absent)