vhdl coding for Carry Select Adder

说明：  环路滤波器是通信信号调制解调中最重要的一个部分，环路滤波器设计的好坏将直接影响到接收机的性能指标，二阶锁频辅助三阶锁相环路滤波器可以稳定跟踪具有加加速度的信号源，是现代通信中非常实用的技术，本文中详细编写了单载波信号产生模块、信道噪声模块、数字正交下变频模块、鉴频鉴相模块、环路滤波器模块，并包含了完整的testbench模块，对于初学者非常有用。(Loop filter is the most important part of communication signal modulation and demodulation. The design of loop filter will directly affect the performance index of receiver. The second-order frequency locking assisted third-order phase-locked loop filter can stably track the signal source with acceleration speed, which is a very practical technology in modern communication. In this paper, the single carrier signal generation module and channel noise are written in detail Sound module, digital orthogonal down conversion module, frequency and phase detection module, loop filter module, and contains a complete testbench module, which is very useful for beginners.)

文件中包含BFSK、DPSK、BPSK、QPSK等等数字调制程序。(File contains the BFSK, DPSK, BPSK, QPSK, and so on digital modulation process.)

计算机中每一条机器指令的执行，都离不开程序计数器的正确执行，本程序实现程序计数器。(Computer implementation of each machine instruction, are inseparable from the correct implementation of the program counter, this program achieve the program counter.)

用PrimeTime的技巧，解决复杂时钟问题。(The world of telecommunications chips is full of messy clocking situations. This paper will cover the tricks and tehniques that author Paul Zimmer has developed to avoid the need to pour over reams of timing reports looking for problems. Best paper winner at SNUG San Jose 2001!)

24小时时钟设计程序，含有时，分，秒的电路设计，基于VHDL语言，用Quartus 2程序实现。-24-hour clock design process, with hour, minute, second circuit design, based on the VHDL language, using Quartus 2 program.

verilog，4、5分频器，5分频器占空比3：2-Verilog, 4,5 dividers, five dividers ratio of 3:2

说明：  4位二进制加法计数器的两种不同VHDL的描述,与比较。(4-bit binary addition of two different counter VHDL description, and more.)

这是用verilog语言实现的1024点ff程序t-This is achieved using Verilog 1024 language ff procedures point t

vhdl testbench的编写，textio的编写是一个难点，也是一个重点，而这是本人搜集的多篇关于textio的文章，同时附有简单注释!-vhdl testbench preparation, textio the preparation is a difficult, but also a focus, and this is my collection of articles on textio the article, at the same time with a simple note!

通过verilog语言实现各种基本信号的调制解调过程，包括2psk,qpsk,ppm(Realize the modulation and demodulation process of various basic signals through verilog language, including 2psk, qpsk, ppm)