CREATE A FSM STATE DIAGRAM USING THE FOLLOWING INFORMATION: The system has four states, which represent the current level of the elevator (in order from highest level to lowest level): Entrance Floor (ground level), Employee Parking (first underground level), Underground Parking 2 (one level below em- ployee parking), Underground Parking 3 (two levels below employee parking) •The system has two 1-bit inputs: Up (label: u), Down (label: d) •The system has one 2-bit output: Level (label: L or L1 and L0 for each individual bit, where index 1 indicates the MSB and index 0 the LSB) •If the Up button is pressed, the elevator goes to the level above. If the elevator is already in the highest level, pressing the Up button will have no effect and will stay in the current level. In case the level above is the employee parking, the elevator will skip this level and go directly to the level above it. •If the Down button is pressed, the elevator goes to the level below. If the elevator is already in the lowest level, pressing the Down button will have no effect and will stay at the current level. In case the level below is the employee parking, the elevator will skip this level and go directly to the level below it. •The employee parking button combination is the following: Pressing both buttons, Up and Down, at the same time. This is the only input that will allow the elevator to move from any level directly to the employee parking level. If the elevator is already in the employee parking, this combination will have no effect and will stay at that level. •While the elevator is in the employee parking level, pressing Down will move the elevator to the level below it. Pressing Up will move the elevator to the level above it. •If no button is pressed, the elevator will do nothing and stay in the current level. •The 2-bit output L will indicate the level in binary for Entrance Floor (00), Em- ployee Parking (01), Underground Parking 2 (10) and Underground Parking 3 (11). •The developer of this elevator - unfortunately - chose an encoding of the states that is different from the system output: The Entrance Floor is encoded with 11, Employee Parking with 10, Underground Parking 2 with 01 and Underground Parking 3 with 00

CREATE A FSM STATE DIAGRAM USING THE FOLLOWING INFORMATION: The system has four states, which represent the current level of the elevator (in order from highest level to lowest level): Entrance Floor (ground level), Employee Parking (first underground level), Underground Parking 2 (one level below em- ployee parking), Underground Parking 3 (two levels below employee parking) •The system has two 1-bit inputs: Up (label: u), Down (label: d) •The system has one 2-bit output: Level (label: L or L1 and L0 for each individual bit, where index 1 indicates the MSB and index 0 the LSB) •If the Up button is pressed, the elevator goes to the level above. If the elevator is already in the highest level, pressing the Up button will have no effect and will stay in the current level. In case the level above is the employee parking, the elevator will skip this level and go directly to the level above it. •If the Down button is pressed, the elevator goes to the level below. If the elevator is already in the lowest level, pressing the Down button will have no effect and will stay at the current level. In case the level below is the employee parking, the elevator will skip this level and go directly to the level below it. •The employee parking button combination is the following: Pressing both buttons, Up and Down, at the same time. This is the only input that will allow the elevator to move from any level directly to the employee parking level. If the elevator is already in the employee parking, this combination will have no effect and will stay at that level. •While the elevator is in the employee parking level, pressing Down will move the elevator to the level below it. Pressing Up will move the elevator to the level above it. •If no button is pressed, the elevator will do nothing and stay in the current level. •The 2-bit output L will indicate the level in binary for Entrance Floor (00), Em- ployee Parking (01), Underground Parking 2 (10) and Underground Parking 3 (11). •The developer of this elevator - unfortunately - chose an encoding of the states that is different from the system output: The Entrance Floor is encoded with 11, Employee Parking with 10, Underground Parking 2 with 01 and Underground Parking 3 with 00

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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•If the Up button is pressed, the elevator goes to the level above. If the elevator is
already in the highest level, pressing the Up button will have no effect and will stay
in the current level. In case the level above is the employee parking, the elevator
will skip this level and go directly to the level above it.
•If the Down button is pressed, the elevator goes to the level below. If the elevator
is already in the lowest level, pressing the Down button will have no effect and
will stay at the current level. In case the level below is the employee parking, the
elevator will skip this level and go directly to the level below it.
•The employee parking button combination is the following: Pressing both buttons,
Up and Down, at the same time. This is the only input that will allow the elevator
to move from any level directly to the employee parking level. If the elevator is
already in the employee parking, this combination will have no effect and will stay
at that level.
•While the elevator is in the employee parking level, pressing Down will move the
elevator to the level below it. Pressing Up will move the elevator to the level above
it.
•If no button is pressed, the elevator will do nothing and stay in the current level.
•The 2-bit output L will indicate the level in binary for Entrance Floor (00), Em-
ployee Parking (01), Underground Parking 2 (10) and Underground Parking 3
(11).
•The developer of this elevator - unfortunately - chose an encoding of the states
that is different from the system output: The Entrance Floor is encoded with 11,
Employee Parking with 10, Underground Parking 2 with 01 and Underground
Parking 3 with 00

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