递增方式在4位数码管上向上计数显示从0000

This tutorial introduce VHDL code for clock pulse and 4-bit counter. With four bits, the counter count from 0 to 15. The timing of the counter is controlled by a clock signal. There will be a clear signal which can reset the counter value.

FIR滤波器的VHDL语言实现-The implement of FIR Filter based on VHDL

按键可调占空比的PWM波产生程序。语言：VHDL(Button adjustable duty cycle of the PWM wave generator. Language: VHDL)

单口RAM带CLR信号的verilog程序。很详细的.(Single-port RAM with a CLR signal)

主要编写了一组二进制数据通过根升余弦滤波器后的波形，但并没有使用ISE内部的FIR滤波器内核，该程序相当于编写了一个根升余弦滤波器。(Mainly prepared a set of binary data through the root raised cosine filter waveform after, but did not use the ISE internal FIR filter kernel, the program is equivalent to the preparation of a root raised cosine filter.)

VHDL is defined by IEEE Standard 1076, IEEE Standard VHDL Language Reference Manual (the VHDL LRM). The original standard was approved in 1987. IEEE procedures require that standards be periodically reviewed and either reaffirmed or revised. The VHDL standard was revised in 1993, 2000, and 2002. In each revision, new language features were added and some existing features enhanced. The aim in each revision was to improve the language as a tool for design and verification of digital systems. Since the 2002 revision, there have two parallel efforts to further develop the language. The first was the VHDL Procedural Interface (VHPI) Task Force, a subcommittee of the IEEE P1076 Working Group. The VHPI Task Force prepared an interim amendment to the standard, formally approved by IEEE in March 2007. The amendment is titled IEEE 1076c, Standard VHDL Language Reference Manual―Amendment 1: Procedural Language Application Interface.

This code implement a interation in cordic pipelline

一个AD9226芯片的驱动，用FPGA写的。虽然简单，但是希望对各位有帮助(An AD9226 chip driver, FPGA written. Though simple, but I hope you will help)

Ethernet MAC-MII interface of Transmit

Hynix公司8M byte sdr sdram的verilog语言仿真实现。-Hynix company 8M byte sdr sdram realize the Verilog simulation language.