以太网总线源代码，里面有详细的文档说明，已经过FPGA验证。...

设计一4位比较器,画出门级电路图,用verilog语言完成设计。 (Design a four comparators, drawing out level circuit diagram, complete the design using verilog language. )

说明：  直接数字式频率合成器DDS设计、Verilog。 产生的信号可以是正弦波或方波、三角波、锯齿波等，自选。 采用DDS技术，将所需生成的波形写入ROM中，按照相位累加原理合成任意波形。 此方案得到的波形稳定，精度高，产生波形频率范围大，容易产生高频。 本实验在设计的模块中，包含以下功能： （1）通过 freq 信号输入需要的频率的值； （2）通过 wave_sel 信号选择所需的波形； （3）通过 amp_adj 信号选择波形放大的倍数。(DDS design of direct digital frequency synthesizer, Verilog. The generated signal can be sinusoidal or square wave, triangular wave, sawtooth wave and so on, optional. By using DDS technology, the required waveforms are written into ROM, and arbitrary waveforms are synthesized according to the principle of phase accumulation. The waveform obtained by this scheme is stable, accurate and easy to generate high frequency waveform. This experiment includes the following functions in the designed module: (1) Input the required frequency value through freq signal; (2) Choosing the required waveform by wave_sel signal; (3) Select the multiplier of waveform amplification by amp_adj signal.)

说明：  本人写的数字锁相环，有模拟数据，学习锁相环很好的材料。参考书“数字锁相环路原理与应用”编写。(I write the digital phase-locked loop, have simulated data, a good phase-locked loop learning materials. Reference book )

the basic system of nexys3(soft core)

huawei代码编码规范，包含基本的verilog的语法等编码规范，业界经典(Huawei code coding specification, including the basic syntax of the Verilog code, the industry classic)

---- ---- ---- WISHBONE Wishbone_BFM IP Core ---- ---- ---- ---- This file is part of the Wishbone_BFM project ---- ---- http://www.opencores.org/cores/Wishbone_BFM/ ---- ---- ---- ---- Description ---- ---- Implementation of Wishbone_BFM IP core according to ---- ---- Wishbone_BFM IP core specification document.--------- ---- WISHBONE Wishbone_BFM IP Core---- -------- ---- This file is part of the Wishbone_BFM project---- ---- http://www.opencores.org/cores/Wishbone_BFM/---- -------- ---- Description---- ---- Implementation of Wishbone_BFM IP core according to---- ---- Wishbone_BFM IP core specification document.

VHDL上百实例 包括 ADDER LATCH FIPPER AND ETC..(VHDL hundreds of examples, including ADDER LATCH FIPPER AND ETC ..)

自己今年的毕业设计DDS波形发生器,有正弦波,方波,三角波,锯齿波.-Their own design this year

eda技术与vhdl课件,很经典的学习课件-VHDL EDA technology and courseware, it is a classic learning courseware

说明：  基于PCF8591数模转换和DDS技术的信号发生器系统设计(Design of Signal Generator System Based on PCF8591 Digital-to-Analog Conversion and DDS Technology)