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球探比分篮球即时比分:基于CPLD的超聲波測距儀研制

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2013美国nba即时比分 www.480531.live

摘 要:一般的超聲波測距儀可用于固定物位或液位的測量,適用于建筑物內部、液位高度的測量。本超聲波測距儀采用CPLD(Complex Programmable Logic Device)器件,運用VHDL(Very High Speed Integrated Circuit Hardware Description Language)編寫程序,使用MAX+plus II軟件進行軟硬件設計的仿真和調試,最終實現測距功能。
本超聲波測距儀設計中采用的是MAX7000s系列中的EPM7128SLC84-15的CPLD器件,其最高頻率可達175.4MHz,可用于組合邏輯電路、時序邏輯電路、算法、雙端口RAM等的設計。充分利用了其多達128個宏單元、68pin可編程I/O口,使該器件可以將分頻功能、計數功能、顯示編碼功能、振蕩功能全部集于一體。又因其延時平均的特點,保證了測距結果精度高、響應速度快。
關鍵詞: 可編程邏輯器件 超聲波 測距

Abstract: Generally speaking, the ultrasonic range finder can be used to measure the object position and liquid level, it is suited to measure the hEight of building’s internal and water line. My device make use of CPLD(Complex Programmable Logic Device) and uses VHDL(Very High Speed Integrated Circuit Hardware Description Language) to program. Utilizing the software of MAX Plus II to carry out the simulation and debug.
The design of the ultrasonic range finder applies the EPM7128SLC84-15 appliance .The highest working frequency is up to 175.4MHz and it is belong to the MAX7000S devices series. The EPM7128SLC84-15 can realize the design of the compounding logic circuit, sequential logic circuit, calculation, double ports-settings RAM and the like. To make use of the EPM7128SLC84-15 with up to 128 macro cells that are combined into of 16 macrocells groups and 68 maximum user I/O pins, the device has comprised frequency divider, counter function block, display function and oscillator. Ensure the high measurement precision and quick respond due to the EPM7128SLC84-15’s average pin-to-pin logic delays.ousing Resource Archives System (HRAS) is suitable for filing housing resource related file. Through the system, users can input, audit and manage housing resource files. More important, one could easily translate the original hardcopy to electronic record file via scanning system and save to the HPMS system for browsing future or develop for other potential usage; HPMS does not only have a very strong engine to support housing property file input, browse, review and management, but has extendable and general feature.
This paper introduces the detail of main function development and describes the development process of sub management system.

Keyword: CPLD, VHDL, Ultrasonic wave, Distance measurement

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