本文主要介绍了50％占空比三分频器的三种设计方法，并给出了图形设计、VHDL设计、编译结果和仿真结果。设计中采用EPM7064AETC44-7 CPLD，在QUARTUSⅡ4.2软件平台上进行。 -This paper introduces a 50% duty cycle three dividers of the three design methods, and gives the graphic design, VHDL design, compile results and the

基于CPLD／FPGA的可编程逻辑器件，借助单片机AT89C51；利用标准频率50～100MHz的周期信号实现系统计数的等精度测量技术。同时采用闸门测量技术完成脉宽,占空比的测量。-Based on CPLD/FPGA programmable logic devices, with single-chip microcomputer AT89C51 using a standard 50 ~ 100MHz frequency of the periodic signal, such as c

VHDL数字频率计的相关设计报告，讲解了频率测量和占空比测量的原理和实现方式-VHDL related design report of digital frequency meter, explained the frequency measurement and duty ratio measuring principle and the methods of realization