Al-Ahliyya Amman University

جامعة عمان األهلية

Project

Second Semester 2019/2020

Advance Digital System

Student Name : Student ID:

EP-04-01-F151-Eng, Rev. c

Ref.: 31/19 / 2014 - 2015

Date: 09/08/2015

1-1

VENDMACH is a vending machine that accepts nickels, dimes, and quarters, and dispenses gum, apple, or yogurt. A gum pack costs 15¢, an apple is 20¢, and yogurt is 25¢.

The ma chine has the following 1 - bit input s:  NICKEL: a signal that becomes 1 when a nickel is deposited in the coin slot.

 DIME: a signal that becomes 1 when a dime is deposited in the coin slot.

 QUARTER: a signal that becomes 1 when a quarter is deposited in the coin slot.

 COINRETURN: a signal that becomes 1 when the coin return button is pressed.

 GUM: a signal that becomes 1 when the gum selection button is pressed.

 APPLE: a signal that becomes 1 when the apple selection button is pressed.  YOGURT: a signal that becomes 1 when the yogurt selection button is pressed.

Al-Ahliyya Amman University

جامعة عمان األهلية

Project

Second Semester 2019/2020

Advance Digital System

Student Name : Student ID:

EP-04-01-F151-Eng, Rev. c

Ref.: 31/19 / 2014 - 2015

Date: 09/08/2015

2-1

In addition to these “ user ” inputs, the ma chine has two control inputs:

 CLOCK: a timing signal that sequences the state transitions of the machine.

 INIT: an initialization signal that resets the machine to a suitable starting state.

The ma chine has thre e outputs:

 CREDIT: the amount of money deposited so far and available to make a purchase;

CREDIT, in cents, should be displayed on the LEFT and RIGHT LED digits.

 DISPENSED ITEM: the item that was just purchased should be displayed on the

 XS40 LED: g for gum, A for apple, and y for yogurt, as indicated in Figure.

Instructions:

 Use proteus software to implement the design of system and test it.