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可编程逻辑 XAPP806 -决定DDR反馈时钟的最佳DCM相移
This application note describes how to build a system that can be used for determining theoptimal phase shift for a Double Data Rate (DDR) memory feedback clock. In this system, theDDR memory is controlled by a controller that attaches to either the OPB or PLB and is used inan embedded microproces ...
可编程逻辑 XAPP328-使用CPLD设计MP3播放器
 
MP3 portable players are the trend in music-listening technology. These players do not includeany mechanical movements, thereby making them ideal for listening to music during any type ofactivity. MP3 is a digital compression technique based on MPEG Layer 3 which stores music ina lot less ...
可编程逻辑 Protel DXP快捷键大全
enter——选取或启动
esc——放弃或取消
f1——启动在线帮助窗口
tab——启动浮动图件的属性窗口
pgup——放大窗口显示比例
pgdn——缩小窗口显示比例
end——刷新屏幕
del——删除点取的元件（1个）
ctrl+del——删除选取的元 ...
可编程逻辑 扩频通信芯片STEL-2000A的FPGA实现
针对传统集成电路（ASIC）功能固定、升级困难等缺点，利用FPGA实现了扩频通信芯片STEL-2000A的核心功能。使用ISE提供的DDS IP核实现NCO模块，在下变频模块调用了硬核乘法器并引入CIC滤波器进行低通滤波，给出了DQPSK解调的原理和实现方法，推导出一种简便的引入?仔/4固定相移的实现方法。采用模块化的设计方法使用VHDL语言 ...
可编程逻辑 基于CPLD的QDPSK调制解调电路设计
为了在CDMA系统中更好地应用QDPSK数字调制方式，在分析四相相对移相（QDPSK)信号调制解调原理的基础上，设计了一种QDPSK调制解调电路，它包括串并转换、差分编码、四相载波产生和选相、相干解调、差分译码和并串转换电路。在MAX+PLUSⅡ软件平台上，进行了编译和波形仿真。综合后下载到复杂可编程逻辑器件EPM7128SLC84-15中 ...
工控技术 赛灵思电机控制开发套件简介（英文版）
The power of programmability gives industrial automation designers a highly efficient， cost-effective alternative to traditional motor control units （MCUs）。 The parallel-processing power， fast computational speeds， and connectivity versatility of Xilinx® FPGAs can accelerate the impl ...
测试测量 基于Multisim 10的矩形波信号发生器仿真与实现
在Multisim 10软件环境下，设计一种由运算放大器构成的精确可控矩形波信号发生器，结合系统电路原理图重点阐述了各参数指标的实现与测试方法。通过改变RC电路的电容充、放电路径和时间常数实现了占空比和频率的调节，通过多路开关投入不同数值的电容实现了频段的调节，通过电压取样和同相放大电路实现了输出电压幅值的调节 ...
uCOS 介绍几种cpuThe 8xC251SA/SB/SP/SQ improves on the MCS-51 architecture and peripheral features, introducin
介绍几种cpuThe 8xC251SA/SB/SP/SQ improves on the MCS-51 architecture and peripheral features, introducing the advanced register based CPU architecture i.e., the MCS 251 microcontroller architecture. The register based CPU supports a 40-byte register file. In addition, the 8xC251SA/SB/SP/SQ microcont ...
压缩解压 This scheme is initiated by Ziv and Lempel [1]. A slightly modified version is described by Storer a
This scheme is initiated by Ziv and Lempel [1]. A slightly modified version is described by Storer and Szymanski [2]. An implementation using a binary tree is proposed by Bell [3]. The algorithm is quite simple: Keep a ring buffer, which initially contains "space" characters only. Read several lette ...
嵌入式/单片机编程 Altera recommends the following system configuration: * Pentium II 400 with 512-MB system memory (fa
Altera recommends the following system configuration: * Pentium II 400 with 512-MB system memory (faster systems give better software performance) * SVGA monitor * CD-ROM drive * One or more of the following I/O ports: - USB port (if using Windows XP or Windows 2000) for USB-Blaster(TM) or MasterBla ...