基于74LS175芯片的四人抢答器设计

电子科学与技术系

学年论文

中文题目：基于74LS175芯片的四人抢答器设计

英文题目: Based on the 74LS175 chip of chip of the design of vies to answer first four people

姓名：支晓东

学号：1207010331

专业名称：电子科学与技术

指导教师：梅金硕

2015年6月12日

基于74LS175芯片四人抢答器的设计作者：支晓东哈尔滨理工大学电子科学与技术系

[内容摘要]：随着电子技术的发展，它在各个领域的应用也越来越广泛。人们对它的认识也逐步加深。人们也利用了电子技术以及相关的知识解决了一些实际问题。如：智能抢答器的设计与制作。抢答器是竞赛问题中一种常用的必备装置，从原理上讲，它是一种典型的数字电路。触发器是数字电路中的基本逻辑记忆单元，具有两个稳定状态用以表示逻辑状态“l”和“0”。在电路中它具有记忆信号的功能，是构成各种时序电路的最基本逻辑单元.本文通过对抢答器电路设计的详细分析，以加深对触发器的功能以及其应用的认识和理解。数字抢答器由主体电路与扩展电路组成。触发器电路将参赛队的输入信号在显示器上输出；主持人按开始按钮示意开始，以上两部分组成主体电路。通过两个与门电路实现屏蔽功能，构成扩展电路。经过布线、焊接、调试等工作后数字抢答器成形。

供四人用的竞赛抢答器装置线路，用以判断抢答优先权。它有三部分构成：1个D触发器74LS175，它具有置0端，置1端和CP端；1个4输入与门，1个二输入与门；四个轻触开关，它们组成抢答电路中的CP时钟脉冲源，抢答开始时，由主持人清除信号，按下复位开关S，74LS175的输出Q 1非～Q 4非全为1，所有发光二极管LED均熄灭，当主持人宣布“抢答开始”后，首先作出判断的参赛者立即按下开关，对应的发光二极管点亮，同时，通过与门送出信号锁住其余三个抢答者的电路，不再接受其它信号，直到主持人再次清除信号为止.

[关键词]：数字电路设计；触发器；优先抢答

Based on the 74 LS175 chip of the design of vies to answer

first four people

Abstract：With the development of electronic technology, its application in all fields more and more widely. People the knowledge of it also deepened step by step. People use electronic technology and relevant knowledge to resolve some problems. Such as: intelligent vies to answer first is the design and manufacture. The problem is a competition vies to answer first used the necessary device, from the principle of speaking, it is a kind of typical digital circuits. Flip-flop is in digital circuits basic logic memory unit, with two steady state is used to represent the logical state "l" and "0". In a circuit it has the function of memory signals, it is to make the most of the sequential circuits basic logic unit. This article through to the gun a processor circuit design detailed analysis, in order to deepen our understanding of the function of the application and trigger the understanding and the understanding. Digital vies to answer first is composed of main circuit and expanding the circuit. Trigger circuit will be the team's input signal on a display output; Press the start button beckoned to start the, the above two parts subject circuit. Through the two gate and realize the shielding function, constitute expansion circuit. After wiring, welding, commissioning work digital vies to answer first is forming.

For four of the competition with the device vies to answer first line to determine vies to answer first priority. It is composed of three parts: 1 D flip-flop 74 LS175, it has to buy the 0, buy 1 end and the CP end; A 4 input to the door, a second input and the door; Four light touch switch, they constitute the CP clock pulse vies to answer first circuit source, vies to answer first began, the host clear signal, press the reset switch S, 74 LS175 output Q and the ~ Q and the total for the 1, all leds are LED to put out, when the host announced "vies to answer first start", first to judge the press the switch immediately, the corresponding leds light, and at the same time, through the door and send out signals to lock the three who vies to answer first the circuit, no longer accept other signals until the host again so clear signal.

Keywords: Digital circuit design Flip-flop First vies to answer first