It Is Intended To Design And Implement A Logic Circuit For M

It Is Intended To Design And Implement A Logic Circuit For Managing Th

It is intended to design and implement a logic circuit for managing the parking lot, which is arranged in a straight line and has a capacity of 10 parking places. The system should manage vehicle entries and exits using input signals Sin and Sout, which are binary sensors indicating the presence of a car at the entrance and exit points, respectively. The input signals are active high, meaning a signal of "1" indicates the detection of a car.

Along with these inputs, the system receives PlaceIn and PlaceOut signals, each 4 bits long, specifying the parking spot where a car intends to enter or leave. Additionally, a CLR signal, which is active low, resets the system to its initial state. The parking system must process these signals considering the constraints of a single day, with a maximum of 15 cars entering per day and a parking capacity of 10 places.

The circuit must produce several outputs: Open, which signals drivers that there are available parking spaces; Almost_Full, indicating that fewer than three places remain; Nr_Places, showing the number of free parking spots; Profit, reflecting the total sales accumulated, with each car parking generating 4 Euros; and Places, a 10-bit signal where each bit corresponds to a parking spot, with "0" indicating available and "1" indicating occupied.

Operational timing constraints specify that each clock cycle lasts 1 second, and the process of a car entering or leaving takes 5 seconds. During this interval, no other entry or exit should be processed, even if sensors detect activity. The system must be implemented using Xilinx ISE tools, employing both schematic logic gate design and Verilog code, with simulation testing to verify functionality. Advanced functions are not permitted, so only basic combinational and sequential logic are acceptable.

Paper For Above instruction

The design and implementation of a logic circuit for managing a parking lot require a comprehensive understanding of digital systems, combinational and sequential logic circuits, and timing considerations. This paper discusses the methodology for developing such a system, including the system architecture, control logic, timing constraints, and implementation strategies using Xilinx ISE tools.

The parking lot management system must monitor and control vehicle entry and exit while maintaining an accurate count of available parking spaces, propagating real-time status signals to drivers, and calculating accumulated revenue. The core components of this system include input sensors, control logic, counters, registers, and output indicators. The integration of these elements must conform to the specified timing and logical constraints, ensuring robust and reliable operation.

System Architecture and Input/Output Definitions

The system takes several inputs: Sin and Sout sensors detect vehicles at entry and exit points. The signals are active high; hence, detection is indicated by a logical "1." The PlaceIn and PlaceOut signals specify targeting parking spots for entry or exit procedures, enabling precise control over parking space management. The CLR signal resets the entire system to a known initial state, clearing occupied spots, resetting counters, and restoring profit to zero.

The outputs include Open and Almost_Full signals to inform drivers of parking availability status. Open is activated when there are available spaces, while Almost_Full indicates less than three remaining places. The Nr_Places output displays the count of free places in binary, facilitating electronic monitoring. The Profit signal is a numerical value reflecting the accumulated earnings, which increments by 4 Euros for each car entering the lot. The Places output uses a 10-bit signal where "0" indicates an available parking spot, and a "1" indicates an occupied spot. This bit map allows quick visualization and status checks of each parking space.

Logic and Control Processes

The core logic involves several sequential and combinational components. Counter modules track the number of vehicles present, ensuring that the total does not exceed the maximum capacity of 10. When a vehicle enters, the system verifies available space, updates the counter, and sets the corresponding bit in the Places signal. Conversely, vehicle exit operations update the counter and clear the respective bit.

The control logic must enforce the 5-second processing period for each entry or exit. This timing is implemented via flip-flops and timers synchronized with the system clock. During this period, the system ignores further vehicle detections to prevent concurrent modifications. Once the processing interval completes, the system resets the timer and resumes normal operation.

The calculation of the profit involves a binary accumulator that increases by 4 Euros each time a vehicle is successfully parked. The calculation must be synchronized with the entry process to ensure accurate monetary tracking. The real-time status of the parking lot is represented through combinational logic that updates the Places signal, increments or decrements counters, and manages outputs accordingly.

Implementation in Hardware and Simulation

The hardware implementation includes designing schematic logic gates for each functional block, such as counters, comparators, encoders, and multiplexers. The design must adhere to basic logic gate restrictions, avoiding advanced functions and relying solely on fundamental gates like AND, OR, NOT, XOR, NAND, and NOR.

Using Xilinx ISE, the schematic entries are created for each module, interconnected to form the complete system. Verilog code can be alternatively employed for more modular development and easier simulation. In both cases, test benches simulate various scenarios such as multiple entries, simultaneous exits, resets, and timing delays, to validate all functional aspects.

The simulation results confirm the correct update of parking spots, profit calculation, and status signals, demonstrating that the system effectively manages parking lot operations within the stipulated constraints. The verification process ensures that timing, logical accuracy, and reset functions perform as expected under typical and edge-case scenarios.

Conclusion

The development of a parking lot management circuit involves combining digital logic design principles with careful timing and control considerations. By employing basic logic gates and sequential elements within Xilinx ISE software, the system achieves reliable operation that adheres to the specified timing of 5 seconds per operation and maximum capacity constraints. Such a system exemplifies practical digital design for real-world applications, providing an automated, accurate, and user-friendly parking management solution.

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