Pearson eText for Software Engineering -- Instant Access (Pearson+)
10th Edition
ISBN: 9780137503148
Author: Ian Sommerville
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Chapter 21, Problem 21.3E
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Workflow for embedded software for a voice mail system:
The workflow for embedded software for a voice mail system is represented below:
A voicemail system is a centralized system used in businesses for sending, storing and retrieving audio messages.
The steps or processes in the embedded software for a voice mail system are:
- First the phone displays the number of messages.
- Then the while the phone rings, it counts the number of rings and if the number of rings is more than the stipulated limit, then answering mashing is activated which plays message...
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Figure 1 shows an ASM chart representing the operation of a controller. Stateassignments for each state are indicated in square brackets for [Q1, Q0].Using the ASM design technique:(a) Produce a State Transition Table from the ASM Chart in Figure 1.(b) Extract minimised Boolean expressions from your state transition tablefor Q1, Q0, DISPATCH and REJECT. Show all your working.(c) Implement your design using AND/OR/NOT logic gates and risingedgetriggered D-type Flip Flops. Your answer should include a circuitschematic.
A controller is required for a home security alarm, providing the followingfunctionality. The alarm does nothing while it is disarmed (‘switched off’). It canbe armed (‘switched on’) by entering a PIN on the keypad. Whenever thealarm is armed, it can be disarmed by entering the PIN on the keypad.If motion is detected while the alarm is armed, the siren should sound AND asingle SMS message sent to the police to notify them. Further motion shouldnot result in more messages being sent. If the siren is sounding, it can only bedisarmed by entering the PIN on the keypad. Once the alarm is disarmed, asingle SMS should be sent to the police to notify them.Two (active-high) input signals are provided to the controller:MOTION: Asserted while motion is detected inside the home.PIN: Asserted for a single clock cycle whenever the PIN has beencorrectly entered on the keypad.The controller must provide two (active-high) outputs:SIREN: The siren sounds while this output is asserted.POLICE: One SMS…
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