1007ICT/7611ICT: Computer Systems and Networks - IT Assessment Answer

Subject Code: 1007ICT/7611ICT Internal Code: E_AI_DHDJ_AFB

IT Assessment Answer

TASK: Task Description: You are to build (and test) the following digital logic circuit in the Logisim simulator and write a short report that describes your circuit. The maximum mark that you are able to achieve on the assignment will be determined by the difficulty of the circuit you decide to build. Requirements: For this assignment, you must implement a simple simulation of an elevator. The elevator has two inputs. Input 1 (C) represents the Current floor (0-7). Input 2 (D) represents the Destination floor to move to (0-7). The elevator is only allowed to stop on Floors 1, 2, 3, 5, and 7. Floors 0, 4 and 6 are private and the elevator will not stop there even if the button for that floor is pressed. The elevator movement is successful if C = 1, 2, 3, 5, or 7, D = 1, 2, 3, 5, or 7, and C ? D. Any other values will result in an elevator movement error and the elevator will not move. Part A Circuit Option 1: Part A Only: The implementation for this part must use only the three basic logic gates (AND, OR, NOT) with maximum 2 inputs. You are required to implement a circuit where the user (you) can input a value for the Current floor (C) using value (C1, C2, and C3) and a Destination floor to move to (D) using value (D1, D2, and D3) and the circuit decodes the C1, C2, C3 and D1, D2, D3 values using a decoder (see lecture notes) made up of only the permitted logic gates to determine if the requirement for moving in the requirements section on page 4 is met. The output will be a single LED labeled Successful which is lit if C = 1, 2, 3, 5, or 7, D = 1, 2, 3, 5, or 7, and C ? D. The LED is not lit for any other values of C and D. Part B Circuit Option 2: Part A and Part B For this part, the elevator has a security mechanism that locks the elevator and stops it from moving if a certain number (N) of unsuccessful attempts to move are made. An unsuccessful attempt to move is when the elevator tries to move from a private floor or to a private floor, or if the elevator tries to move to the floor it is currently on (eg: C=3, D=3). Floors 0, 4 and 6 are private floors. The number N ranges from 1 to 7 and must be set via a combination of three separate inputs: N1, N2, and N3. An N value of 0 is not allowed and you need to set N to be non-zero (1..7) before setting elevator floor values.

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