CPLD可编程逻辑芯片上实现信号发生器的方法和步骤，系统采用自顶向下的设计方法，以硬件描述语言VHDL和原理图为设计输入，利用模块化单元构建系统。-CPLD programmable logic chip Signal Generator methods and steps system uses top-down design approach to hardware descr iption language VHDL and principles of map design input,

用VHDL语言设计一个8位加法器： 在八位加法器代码一中：加法器是由两个4位二进制加法器U1和U2组成的8位加法器逻辑电路，其中U1用来装载8位加法器中两个加数的低4位，而U2则用来装载高4位。在设计4位加法器时，定义输入信号量CIN、A、B以及输出信号量S、Cout。定义信号量SINT/AA/BB，将加数A和0并置后赋给AA，加数B和0并置后赋给BB，形成5位二进制数，这是为在做加法时发生溢出所做的处理，然后将加数AA与BB以及进位Cin相加赋给SINT，并将SINT的低4位赋给加数和S输

2选1的数据选择器 实现2选1的电路功能，其真值表和电路符号如下图所示。即当s＝1时，输出m＝y；当s＝0时，输出m＝x。 -2 Select a data selector circuit to achieve 2 S 1 function, its truth table and circuit symbols shown below. That is, when s = 1, the output m = y when s = 0, the output m = x.

this project is related with Goal of this system is applying some microprocessor knowledge with use C code on the hardware design. This project is calculating the body mass index value of a person on LCD screen and printing the BMI value. Program nee

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