网址:https://hdlbits.01xz.net/wiki/Fsm1s
// Note the Verilog-1995 module declaration syntax here:
module top_module(clk, reset, in, out);input clk;input reset; // Synchronous reset to state Binput in;output out;// reg out;// Fill in state name declar…
网址:https://hdlbits.01xz.net/wiki/Vector5
module top_module (input a, b, c, d, e,output [24:0] out );//// The output is XNOR of two vectors created by // concatenating and replicating the five inputs.assign out ~{{5{a}},{5{b}},{5{c}},{5{d}},{…
题目要求: 用 M e a l y \rm Mealy Mealy型状态机验证 1101 1101 1101序列
题目描述: 使用状态机验证 1101 1101 1101序列,注意:允许重复子序列。
方法一: 去掉 M o o r e \rm Moore Moore的 s 4 s_4 s4ÿ…
题目:Module cseladd
One drawback of the ripple carry adder (See previous exercise) is that the delay for an adder to compute the carry out (from the carry-in, in the worst case) is fairly slow, and the second-stage adder cannot begin computing …
参考连接:HDLBits导学
Problem 1 : Zero 问题:没有输入,输出0 解决:
module top_module(output zero
);// Module body starts after semicolonassign zero 0;
endmodule Problem 2 : Wire 问题:使用wire让输出等于…
在使用vivado做两位十进制数倒计时动态显示时,出现以下错误。
提示错误:
[DRC NSTD-1] Unspecified I/O Standard: 4 out of 34 logical ports use I/O standard (IOSTANDARD) value DEFAULT, instead of a user assigned specific value. This may ca…
参考链接:HDLBits导学 Problem 80 : D flip-flop (Dff) 问题:实现一个D触发器 解决:
module top_module (input clk, // Clocks are used in sequential circuitsinput d,output reg q );//// Use a clocked always block// copy d to …
关键词:case,选择器 case 语句是一种多路条件分支的形式,可以解决 if 语句中有多个条件选项时使用不方便的问题。
case 语句 case 语句格式如下:
case(case_expr)condition1 : true_statement1 ;condition2 …
Latiches and Flip-Flops(锁存器与触发器)
1. Dff
A D flip-flop is a circuit that stores a bit and is updated periodically, at the (usually) positive edge of a clock signal. D flip-flops are created by the logic synthesizer when a cloc…
本篇博客记录一下自己在实际过程中遇见的易错的语法细节。 两种不同条件下的fork join_none的使用: 1、
program fork_pra;initial beginfor(int i 0; i < 3; i) beginfork $write(i);join_none#0;endendendprogram上述这种,可以看见延时语句在fork…
第一节课 linux命令
文件命令
man 查询指令的作用 如 man cd
ls 列出当前文件和文件夹的名字(list the directory and files)
ls -a 把隐藏的文件和文件夹也显示出来 (list all) ls -l 把文件的属性(读写&…
文章目录 9.Declaring wires | wire decl10. 7458 chip 9.Declaring wires | wire decl
problem:Implement the following circuit. Create two intermediate wires (named anything you want) to connect the AND and OR gates together. Note that the wire that feeds the …
HDLBits 刷题笔记 - Exams_ece241 2013 q8 - HDLBits
题目原文:Exams/ece241 2013 q8 - HDLBits
题意 Implement a Mealy-type finite state machine that recognizes the sequence “101” on an input signal named x. Your FSM should have an output signal, …
前段时间,在微信公众号上偶然看到一篇很不错的技术分享文章:《南湖处理器DFT设计范例》。文中详细介绍了中科院计算所的RISC-V处理器实施的DFT设计。 去年,也基于一款处理器应用过Share Test Bus技术,但在memory界面fault测试的问…
目录 Module shift8 Module shift8
This exercise is an extension of module_shift. Instead of module ports being only single pins, we now have modules with vectors as ports, to which you will attach wire vectors instead of plain wires. Like everywhere else i…
本专栏的目的是分享可以通过HDLBits仿真的Verilog代码 以提供参考 各位可同时参考我的代码和官方题解代码 或许会有所收益 题目链接:Wire - HDLBits
module top_module( input in, output out );assign out in ;
endmodule
题目:Always case
A priority encoder is a combinational circuit that, when given an input bit vector, outputs the position of the first 1 bit in the vector. For example, a 8-bit priority encoder given the input 8’b10010000 would output 3’d4, b…
迄今为止讲的最好的D触发器
转载自www.runoob.com https://www.runoob.com/w3cnote/verilog2-gate-delay.html D 触发器
下面从门级建模的角度,对 D 触发器进行设计。
SR 触发器
SR 触发器结构图及真值表如下所示。
1、当 S 为低电平,G1 输出端 Q 为…
概述 本文主体翻译自C. E. Cummings and S. Design, “Simulation and Synthesis Techniques for Asynchronous FIFO Design 一文,添加了笔者的个人理解与注释,文中蓝色部分为笔者注或意译。前文链接:
异步FIFO设计的仿真与综合技术…
文章目录 3.Simple wire4.Four wires5.inverter | Notgate6. And gate7.Nor gate8.Xnorgate 3.Simple wire
problem:Create a module with one input and one output that behaves like a wire.
module top_module( input in, output out );assign out in;endmodule4.Four w…
记录Quartus中遇到的报错
一、Failed to launch MegaWizard Plug-In Manager
报错:Failed to launch MegaWizard Plug-In Manager. PLL IntelFPGA IP v18.1 could not be found in the specified librarypaths.
原因:编译后无法再打开IP核查看了&…
System Verilog数据类型分为两大类,一类是变量(variable),一类是网线(net)。这两种类型在赋值和存储值上有所区别
net一般只用于assign连续赋值,部分net类型可以有多个驱动(driver&…
Consider the function f shown in the Karnaugh map below. Implement this function.
(The original exam question asked for simplified SOP and POS forms of the function.) //
Getting Started
problem: Build a circuit with no inputs and one output. That output should always drive 1 (or logic high).
答案不唯一,仅共参考:
module top_module( output one );// Insert your code hereassign one 1;endmodule相关解释…
文章目录 20.Module21.Connecting ports by position | Moudle pos22.Connecting ports by name | Module name23.Three modules | Module shift24.Modules and vectors | Module shift8 20.Module
practice:You may connect signals to the module by port name or port posi…
题目:Module add
You are given a module add16 that performs a 16-bit addition. Instantiate two of them to create a 32-bit adder. One add16 module computes the lower 16 bits of the addition result, while the second add16 module computes the upper…
题目:Module addsub
An adder-subtractor can be built from an adder by optionally negating one of the inputs, which is equivalent to inverting the input then adding 1. The net result is a circuit that can do two operations: (a b 0) and (a ~b …
题目:Alwaysblock1
Since digital circuits are composed of logic gates connected with wires, any circuit can be expressed as some combination of modules and assign statements. However, sometimes this is not the most convenient way to describe the…
题目:Alwaysblock2
For hardware synthesis, there are two types of always blocks that are relevant: 对于硬件综合,有两种相关的always块:
Combinational: always () 组合型:always ()Clocked: always (posedge clk) 时钟型…
题目:Always if2
A common source of errors: How to avoid making latches 一个常见的错误来源:如何避免产生latches
When designing circuits, you must think first in terms of circuits: 在设计电路时,必须首先考虑电路:
I want this logic gate…
前言 在使用FIFO IP核时,我更喜欢使用FWFT(First Word First Through) FIFO而非标准FIFO,FWFT FIFO的数据会预先加载到dout端口,当empty为低时数据就已经有效了,而rd_en信号是指示此FIFO更新下一个数据,这种FWFT FIFO的…
题目:Vector100r
Given a 100-bit input vector [99:0], reverse its bit ordering.
给定一个100位输入向量[99:0],反转它的位顺序。
Hint…
提示……
A for loop (in a combinational always block or generate block) would be useful here. I wo…
1.相关概念 DDS(Direct Digital Synthesis,直接数字合成)是一种通过数字技术生成精确频率和相位可调的信号的方法。它基于数字时钟和数值控制的方式,通过累加器、相位累积器和查表器等组件,以数字方式实现信号的频率和…