With the rapid development of EDA technology, large-scale programmable logic devices CPLD/FPGA applications are more and more widely used, which not only simplifies the digital system design process, reduces the size and cost of the system, but also improves the reliability and confidentiality of the system. Make the implementation of various logic functions flexible and convenient.
1. Design requirementsThe starting price during the day is 5 yuan within 3 kilometers, and the starting price at night is 6 yuan within 3 kilometers. During the daytime driving, 3 kilometers will be charged at 1.8 yuan/km, and at night, the car will be charged at 2.2 yuan/km after 3 kilometers. When the reset button is pressed, the taxi meter returns to the initial state, if it is daytime, the display fee is 5 yuan, and at night, the fee is 6 yuan. When the start travel button is pressed, the taxi is charged according to the above charging standard.
2, each module design 2.1, speed moduleThe mileage of the taxi is determined by the sensor mounted on the wheel. Since the circumference of the car wheel is determined by one turn, the car outputs a pulse every revolution. Use clk to indicate the sensor output pulse, reset to indicate the reset signal, stop to indicate the taxi stop button, start to indicate the taxi start button, sp to indicate the taxi pause button, and to output a pulse clkout for the mileage calculation every 100m. And display.
2.2, the meter moduleThe taxi module is mainly used to record the mileage of taxis. By counting the clkout signals output by the vehicle speed module, the distance traveled by the taxi can be calculated. In general, the price is counted once every 0.5km, and a taxi pulse co is output. Kcnt3, kcnt2, kcnt1, and kcnt0 represent the tens of positions, the ones, the tens, and the percentiles, respectively.
2.3, billing moduleThe billing module is mainly used to record the total cost incurred after the taxi is started. When the level is high, it means daytime, when it is low level, it means night, and m0, m1, m2, and m3 respectively represent the tenth, one, ten, and tenths of the total cost output.
2.4, display moduleThe display module is used to display the mileage and total cost of the taxi. Using FPGA/CPLD to control the LCD1602 module, you need to define several lines of lcdrs, lcden, and lcdrw to control its basic operations. Data is used for data output to the LCD 1602.
2.5, top moduleThe design of the above four instantiation components, connected according to Figure 1, constitutes a top-level diagram of the taxi billing system based on EDA technology.
Figure 1: Top-level diagram of taxi billing system based on EDA technology
3, system simulationThe simulation waveform of the vehicle speed module is shown in Figure 2. It can be seen that a pulse meter clkout is output for every 25 sensor pulses. The simulation waveform of the taxi module is shown in Figure 3, which meets the design requirements. The simulation waveform of the billing module is shown in Figure 4. During the day, for every 0.5 km increase, the cost increases by 0.9 yuan.
In this paper, the hierarchical design method of EDA technology is used to design the taxi meter, and each functional module is written in VHDL to realize the underlying design. The relationship between the modules is described by the schematic input method to realize the top-level design. The simulation results show that the design method is simple and fast, and the designed system performance is reliable.
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