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Using vhdl language design taxi meter. Billing functions, accounting standards: mileage charges. The starting price is 8.00 yuan, and after traveling three kilometers billing at 1.90 yuan/km. When the meter reaches more than 20 yuan per kilometer subject to 50 of the fare, car stop is not billing. Display Function: display the fare and mileage, fares and mileage each with four digital tube. Analog functions: analog car to start, stop, pause, and accelerating state.