verilog大王倩组.docVIP

RS232串口通信 班级：集电0901 小组成员：王倩，黄小康，张青 摘要 个人计算机上的通讯接口之一，由电子工业协会(Electronic Industries Association，EIA) 所制定的异步传输标准接口。通常 RS-232 接口以9个引脚 (DB-9) 或是25个引脚 (DB-25) 的型态出现，一般个人计算机上会有两组 RS-232 接口，分别称为 COM1 和 COM2。 关键字： RS232 按键 LCD 移相 调频 ABSTRACT Signal generator is one of the common laboratory instruments, design signal generator has the meaning of practical application. And the method based on FPGA design signal generator can generate high frequency of the signal, such as frequency for a few M sine wave. Usually produced by the method of sine wave is MCU + DDS method, but because of the high cost of DDS, so in the index demand is not high, can use the FPGA to realize the principle of DDS frequency synthesis to produce higher frequency sine wave, arbitrary waveform signal also is such. This design realize a DDS signal generator, can achieve through key phase shifting, FM function, and the sine wave, square, triangle wave, index function waveform conversion, with an oscilloscope to display the waveform, through the LCD to show that the frequency of a wave. Key word: DDS button LCD phase shifting FM 目录 1.系统规范 2.总体描述 2.1.功能描述 2.2.顶层框图 2.3.引脚描述 2.4.接口时序 3.模块划分 3.1 概述（叙述一下划分的几个大的模块） 3.2模块A 3.2.1功能定义 3.2.2信号描述 3.2.3 祥细设计 3.3模块B 3.2.1功能定义 3.2.2信号描述 3.2.3 祥细设计 3.4模块C 3.2.1功能定义 3.2.2信号描述 3.2.3 祥细设计 3.5模块D 3.2.1功能定义 3.2.2信号描述 3.2.3 祥细设计 3.6模块E 3.2.1功能定义 3.2.2信号描述 3.2.3 祥细设计 1.系统规范 本设计实现通过RS232进行的串口通信，通过键盘输入单个字符，然后将字符的8位ASCII码值先存入一个16*8的RAM中，再通过按键使能，通过RS232发送ASCII码值给另一块板子，在另外一块板子上接收数据，转换成ASCII码值传给LCD显示。