This is a use of Xilinx macroblaze the user program will read from flash memory...

利用stm32F407实现的等精度测频，可以精确测量频率，误差很小(The equal precision frequency measurement realized by stm32F407 can accurately measure frequency with little error.)

乘法器是硬件设计中的很常见也很重要的一个模块，它的VHDL硬件实现很好的解决了软件编程中做乘法速度慢的问题，在实时高速系统应用中或DSP软核或数字信号处理硬件实现算法中，经常能使用到乘法器，所以经典的高速乘法器IP 很有参考价值-Multiplier is a common and important module in hardware designing.Its VHDL addresses the low speed of multiplication in software programming. Multiplier is often used in real-time high-speed system application , DSP soft core or hardware implementation of digital signal processing,so it is worthful to know classic high-speed multiplier IP

多倍（次）分频器 请注意: 本例的各个源描述的编译顺序应该是: 52_divider.vhd 52_divider_stim.vhd-Times (times) divider Please note: This case is described in various sources to compile the order should be: 52_divider.vhd 52_divider_stim.vhd

说明：  Verilog经典实例.包括洗衣机红路灯、兹自动方麦基、等式子可用(Classic examples of Verilog. Including red street lights for washing machines, ZAM, equation availability)

VHDL语言设计；功能描述：键盘扫描，不包含去抖电路-VHDL language design Function description: the keyboard scanning, does not contain a circuit debounced

数字钟电路的实现，可以24小时计时，可调整时间！(Digital clock circuit implementation, a 24-hour timer, adjustable time!)

说明：  fPGA中的竞争冒险现象的来源及其解决方法(FPGA in the source of the phenomenon of competitive risk-taking and their solutions)

由VHDL 语言实现的D触发器利用的是QUARTUES环境已经得到验证-By the VHDL language using the D flip-flop is QUARTUES environment has been tested

说明：  是用VHDL语言编写的乐曲演奏程序，详细的写了各个模块的子程序(VHDL language is the music playing program)

数字频率测量器，脉宽测量器。可测量多种频率波形的脉宽。(Digital frequency measurement device, pulse width measurement device. Measurement of the waveform of frequency pulse width)