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CIC 抽取滤波器 Verilog Code

采用流水线结构的CIC 抽取滤波器结构如下: // 三级CIC抽取器实例:cic3_decimator.V module cic3_decimator(clk, x_in, y_out); parameter STATE_HOLD = 1'b0, STATE_SAMPLE = 1'b1; input clk; // 输入时钟 input [7:0] x_in; …

1.计数,用于对精度不高的计数 always @(posedge clk or negedge rst_n) begin if(!rst_n) div_cnt <= 'd0; else div_cnt <= div_cnt + 'b1; end ]; //div_cnt < 100 2.检测边沿 //-------------------------------- //Funtion : detect start pos always @(posedge clk or negedge r…

Verilog Tips and Interview Questions

Verilog Interiew Quetions Collection : What is the difference between $display and $monitor and $write and $strobe? What is the difference between code-compiled simulator and normal simulator? What is the difference between wire and reg? What is the…

verilog流水线加法器

四位加法器两级加法实现 verilog code module pipeliningadder( output reg [3:0] s, output reg co, input [3:0] a, input [3:0] b, input ci, input clk, input rstn ); reg [3:0] a_tmp; reg [3:0] b_tmp; reg [1:0] a_tmp2; reg [1:0] b_tmp2; reg ci_tmp; reg [1:0] s_tmp3;…

verilog 实现加法器

半加器如果不考虑来自低位的进位将两个1二进制数相加,称为半加. 实现半加运算的逻辑电路称为半加器. 真值表逻辑表达式和 \begin{align}\notag s = a{b}' + {a}'b \end{align} 逻辑表达式进位输出 \begin{align}\notag co = ab \end{align} verilog code module halfadder( output s, //sum output co, //carry input a, input b ); as…

verilog FAQ(zz)

1. What is the race condition in verilog? Ans :The situation when two expressions are allowed to execute at same instance of time without mentioning the order of execution. 2. List the levels of abstraction in verilog? Ans : 1. Behavioral level 2. Re…

基于脚本的modelsim自动化仿真笔记

这里记录一下基于脚本的modelsim自动化仿真的一些知识和模板,以后忘记了可以到这里查找.转载请标明出处:http://www.cnblogs.com/IClearner/ . 一.基本介绍这里介绍一下如何利用脚本调用modelsim进行自动化仿真,随笔前面先介绍一下前仿真,随笔结尾处介绍后仿真.前仿真的基本介绍如下所示,由于我的笔记是写在.do文件中,因此我这里也给代码的格式,如下所示: # #表示注释,modelsim不支持中文,因此可能不能识别注释 #①退出当前仿真功能,退出当前的工程…

$clog2(转)

(转http://www.xilinx.com/support/answers/44586.html) 13.2 Verilog $clog2 function implemented improperly SEARCH Description Solution Description The $clog2 function returns the ceiling of the logarithm to the base e (natural logarithm)rather than th…

dda的fpga实现（转载）

The general approach using DDAs will be to simulate a system of first-order differential equations, which can be nonlinear. Analog computers use operational amplifiers to do mathematical integration. We will use digital summers and registers. For any…