EWB课程设计四人抢答器

yuan, an increase of 17.5%; local government general budget revenue of 500 million Yuan, . Painting, model culture creates new Ma Church community, creating Lake scenic spot culture education base, received high evaluation from provincial and municipal discipline Inspection Commission, the peoples daily special report. Constantly promote independent Commission against corruption culture construction to rural extends, created established Dahlin rural industry Park independent Commission against corruption culture positions, formed has a support service low double excellent of members lead team, constantly perfect and established Park funds assets management, and village audit supervision, and villagers democratic financial, system, strengthening Park party, and Chief, and financial, full public, powerful to guarantees has new rural construction, by city rural style clean government inspection unit led of height evaluation. Through the implementation of honest and clean government cultural construction, and effectively educate the broad masses of party members and cadres and consciously regulated behavior and discipline, honesty in politics and culture to create a good atmosphere and fresh development environment. Although we in implement implementation independent Commission against corruption guidelines aspects made has must effectiveness, but away from superior of requirements also exists must of distance, main performance for: a is system enough sound, education, and supervision, and prevention, and punishment, aspects long-term mechanism also enough perfect, especially in enrollment bid work regulatory aspects also needed strengthening; II is regulatory supervision exists lost of Yu wide, and lost of Yu soft, investigation illegal disciplinary case of efforts also needed strengthening, individual sector and cadres also different degree exists treat gift, not to benefits not do, and mess do of phenomenon; Three for honest work is the new situations and new problems in finding timely enough, treatment measures are not strong enough. To solve these problems, we will proceed from the following five aspects of rectification, make sure to implement the provisions of the code. (A) deepening the learning, enhance the consciousness of honesty in politics. To create event as an opportunity to Excel and learning party, further increasing the governance capability and advanced construction, reinforced rules of the broad masses of party members and cadres awareness, sense of responsibility, sense of honor, improve working ability and level of scientific development. Should make full use of meetings, in particular central group learning opportunity, further strengthening the study and education of the code, the intensive warning education, education the majority of party members and cadres known fear, knew fear, honesty in politics of tension the strings, consciousness and enhancing the implementation of the initiative. Also, pay attention to apply what they have learned, consciously study results into planning work, new ideas, 邮电与信息工程学院EWB课程设计实验名称： 四人抢答器 学生学号： 专业班级： 学生姓名： 指导教师： 一、 方案的确定设计一个四人抢答电路。要求：四人参加比赛，每人一个按钮，其中一人按下按钮后，相应的指示灯亮。并且，其他按钮按下时不起作用。 确定利用74LS175四D触发器和门电路设计一4人数码抢答器。扩展功能：4个参赛选手，用14号表示，抢答赛中，锁定并显示最先抢答选手号二、四路抢答器的基本要求及原理 具备至少四个抢答开关及复位开关。 能数字显示抢答结果。 抢答开始时，第一个启动的抢答开关有效，其他抢答开关自动无效，直到复位为止。由要求可知，可选用74LS175四上升沿D触发器和门电路组成(4输入与门选用74LS21，与非门选用74HC00)，具体电路如图1所示。抢答开始时，由主持人清除信号，按下复位开关S(其连接在74LS175 的CLR端口，实现同步清零)，74LS175的输出1Q4Q全为0，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，例如：1号选手按下K1键，此时1D端口被连接到高电平，由74LS175时钟的上升沿触发并锁存，使其输出1Q为高电平，对应的发光二极管亮，同时1Q为“0”，通过与门和与非门送出信号锁住其余三个选手的电路，不再接受其它信号，直到主持人再次清除信号为止。四、方案的实现及单元电路的设计开关阵列（1）该电路由四个单刀双掷开关所组成，每一竞赛者与一组开关相对应。当开关接上端触点时，输出相应Q输出端为高电平，反之输出低电平。（2）. 四D触发器触发锁存电路由四D触发器74LS175构成，当某一开关首先按下时，触发锁存电路被触发，在输出端产生相应的开关电平信息，同时为防止其它开关随后触发而产生紊乱，最先产生的输出电平变化又反过来将触发电路锁定（3）.数码显示管本设计采用的为LED数码管，其功能是对最先按下开关的抢答者编号给予显示。四路抢答器主要由四个模块组成，如下图：抢答模块D触发器模块显示模块判断模块上图为4位集成寄存器74LSl75下表所示是D触发器功能表：74LS175的功能表清零时钟输入输出工作模式CP1D2D3D4D1Q2Q3Q4Q00000异步清零11D2D3D4D1D2D3D4D数码寄存11保持数据保持10保持数据保持特性方程：当D=0时Qn+1=0，当D=1时Qn+1=1，由此得D触发器特性方程为Qn+1=D.图5-5所示即为4路触发锁存电路。图中74LS175为4D锁存器，一开始，当所有开关均未按下时，锁存器输出全为高电平，经4输入与非门和非门后的反馈信号仍为高电平，该信号作为锁存器使能端控制信号，使锁存器处于等待接收触发输入状态；当任一开关按下时，输出信号中必有一路为低电平，则反馈信号变为低电平，锁存器刚刚接收到的开关被锁存，这时其它开关信息的输入将被封锁。由此可见，触发锁存电路具有时序电路的特征，是实现抢答器功能的关键。五、电路仿真 依据要求可以用两种电路图实现功能，本实验选择第二种方案。方案一：方案二： 锁存显示仿真图当按下清零开关键后，所有的输出都将被清零，灯泡全灭，如图3所示。接着可以验证抢答功能，比如1号选手抢先按下了抢答开关，则只有其抢答信号被锁存，输出，点亮1号LED亮，此时其他选手的抢答信号都将被封锁，即使按下了抢答键，其对应的LED灯也不会被点亮。同时可以用虚拟示波器观察始终信号的波形，如图4所示，从图可以看出，当没有人抢答成功时，时钟信号都是正常触发，当其中一人最先抢答成功后，其对应的Q输出为0，通过与门和与非门组成的逻辑电路将CP信号锁存为高电平，封锁了其余选手的抢答信号。同理，可以依次验证其他各个选手抢答成功的情况。(a) 抢答成功前波形 抢答成功前后时钟信号波形图 抢答器仿真功能表如下：输入输出SK4K3K2K1LED1LED2LED3LED4数码管显示0000001000110001100100100210100001031100000014六、硬件部分：（1）显示部分：主要由四个发光二极管组成，四个发光二极管对应相对的四个抢答按钮，可以显示相对应的选手。（2）复位部分：复位是抢答器的一个重要功能之一，当某一抢答输入端有信号输入。则显示这一路的抢答成功。抢答成功后的瞬间能封锁住每一个抢答输入端。使后面的抢答器信号不能进入抢答器，一直到复位控制信号有效，才能解除封锁。进行下一次抢答。抢答模块主要是开关阵列，由四个抢答开关和一个复位开关组成，以供抢答和复位用，当抢答开始时，四位选手都参加抢答，抢答信号经D触发器模块和判断模块分析后，选出最先按下抢答按钮的选手传送的信号，再传至显示模块显示出来，以判断哪位选手先抢到。七、实验体会与总结1、通过这次对四路抢答器的设计，加强了我们动手、思考和解决问题的能力。在整个设计过程中，我进一步的加强了对EWB软件的应用能力，加强了芯片选择的能力。对74LSl75芯片有了很大的认识，对D触发器的置位清零等功能有很多学习，四输入门电路也学习很多。 2、在设计过程中，经常会遇到这样那样的情况，就是心里想老着这样的接法可以行得通，但实际接上电路，总是实现不了，因此耗费在这上面的时间用去很多。另外，自己对EWB各种元器件有了很透彻的学习。3、在设计时查阅了很多资料也请教了很多同学，最终成功设计出与要求相符合的电路时,有一种成就感，但遗憾的事不能亲手把这个东西做出来，只能通过仿真模拟出来。同时也有些很不满意的地方，因为最终无法解决分辨率低的问题，使其不具有实用性。我想以后学了更多的知识会解决这些问题的。这次实验最大的收获是，学会了一种不怕麻烦，迎难而上的精神。采用的原料均来源于草本植物，并不包含任何人工合成添加剂。以健康养生为理念，以天然植物为原料，更加符合现代人的生活诉求，已经成为消费者日常饮料的主要选择。new measures to promote work, the courage to take responsibility, dare to break hard to ensure district, Government decisions and arrangements to implement. (B) strengthening supervision, severely punish acts of violation. One is to open the channels of supervision. Vigorously promote the party affairs public, open, widely accepted supervision by the masses, pay attention to social groups and public opinion supervision, the powerful force formed to urge party members and leading cadres properly exercise their powers. Second, strong supervision and inspection. Democratic life into full play, important briefings, reports related to personal matters and evaluation of cadres study of inner-party supervisory system, a comprehensive grasp of guidelines for the implementation of the independent Commission against corruption-related cases of leading cadres of party members, focus on strengthening key areas of project selection, funding, officials monitor, detect and rectify the problem, promote honesty in politics. Third, strengthen disciplinary investigation. Seriously the implementation of JI .Recently, the County leading bodies at the county level to carry out three trees practice, which is to improve the governing ability and promoting the development of XX effective measure. I carefully follow your deployment requirements, and actively participate in the three trees campaign. Read Group, prepared by the Department in the near future of the ideological and political construction of leading cadres in the city reader, read the relevant information, larger harvest, inspired. I think the ability of repelling is to strengthen the partys governing capacity in questions of the construction of meaning, an important topic remains in front of party members and cadres at all levels, we need to further explore and ponder. The ability of repelling the name suggests, is asking party members and cadres at all levels in particular, leading cadres at all levels, not only ourselves, establish a correct concept of the independent Commission against corruption, political integrity, self-discipline, rejection of corruption, made for the people, pragmatic, honest leadership, and strengthen the sense of r