针对目前使用的RS232接口数字化B超键盘存在PC主机启动时不能设置BIOS，提出一种PS2键盘的设计方法。基于W78E052D单片机，采用8通道串行A/D转换器设计了8个TGC电位器信息采集电路，电位器位置信息以键盘扫描码序列形式发送，正交编码器信号通过XC9536XL转换为单片机可接收的中断信号，软件接收到中断信息后等效处理成按键。结果表明，在满足开机可设置BIOS同时，又可实现超声特有功能，不需要专门设计驱动程序，接口简单，成本低。 Abstract: Aiming at the problem of the digital ultrasonic diagnostic imaging system keyboard with RS232 interface currently used couldn?蒺t set the BIOS when the PC boot， this paper proposed a design method of PS2 keyboards. Based on W78E052D microcontroller，designed eight TGC potentiometers information acquisition circuit with 8-channel serial A/D converter， potentiometer position information sent out with keyboard scan code sequentially.The control circuit based on XC9536 CPLD is used for converting the mechanical actions of the encoders into the signals that can be identified by the MCU， software received interrupt information and equivalently treatmented as key. The results show that the BIOS can be set to meet the boot， ultrasound specific functionality can be achieved at the same time， it does not require specially designed driver，the interface is simple and low cost.
上传时间： 2013-10-10
上传用户：asdfasdfd
Calculation of the Differential Impedance of Tracks on FR4 substrates There is a discrepancy between calculated and measured values of impedance for differential transmission lineson FR4. This is especially noticeable in the case of surface microstrip configurations. The anomaly is shown tobe due to the nature of the substrate material. This needs to be considered as a layered structure of epoxy resinand glass fibre. Calculations, using Boundary Element field methods, show that the distribution of the electricfield within this layered structure determines the apparent dielectric constant and therefore affects theimpedance. Thus FR4 cannot be considered to be uniform dielectric when calculating differential impedance.
上传时间： 2013-10-18
上传用户：masochism
ADAM-5510KW中FPID/PID功能块之实现及应用一、 ADAM-5510KW实现PID控制的方法1、ADAM-5510KW可以使用Multiprog软件提供的FPID和PID功能块来实现PID控制。2、ADAM-5510KW对可以使用的PID控制回路并无限制，实际上，取决于Scan Rate，ScanRate越低，则允许的PID回路越多。3、在实际应用中，流量、液位、压力、温度等等对象都可以进行控制。对于流量、液位、压力等等参数可以用传感器或变送器转换为电压/电流信号接入模拟量输入模块ADAM-5017进行采集；对于温度可以用热电偶模块ADAM-5018或热电阻模块ADAM-5013进行采集；输出的执行机构例如调节阀、风扇等等可由模拟量输出模块ADAM-5024进行控制。二、 ADAM-5510KW中如何调用FPID/PID功能块1、FPID功能块在ProconOS.fwl库中，先将库添加进Project中。
上传时间： 2013-10-12
上传用户：it男一枚
磁盘调度设计，磁盘调度算法的实现，包括 先来先服务调度算法 最短寻道优先调度算法 扫描算法 循环扫描算法 N—Step—SCAN算法
上传时间： 2015-01-11
上传用户：lhw888
键盘过滤驱动，更改scan code
上传时间： 2014-01-13
上传用户：zuozuo1215
AFD - Advanced Filter Design using MATLABMiroslav D. Lutovac, Dejan V. Tosicversion 1.00 released 15 October 1999This program is freeware.Unpack with path names, for exampleDOS: pkunzip -d afdunix: unzip -L afdAfter unpacking afd.zip, and run MATLAB,change directory to afdfrom the MATLAB command window.Execute demoafd to quickly scan the AFD operation.
标签： D. V. MATLABMiroslav Tosicversion
上传时间： 2015-03-21
上传用户：er1219
This simple simulation of a pulse traveling down a parallel-plate guide makes a handy test code for initial experiments with boundary conditions. ToyFDTD3 adds some simple features to ToyFDTD1: A PMC boundary condition, a sinusoidal pulse source, and output tracking a single point in the mesh. Released 15 June 1999.
标签： parallel-plate simulation traveling simple
上传时间： 2015-04-06
上传用户：stella2015
对各种网络扫描工具的使用进行了详细的介绍，Nmap,nessus,x-scan，详细的命令参考，作为工具手册之用
标签： 网络扫描
上传时间： 2015-08-04
上传用户：13160677563
fortran程序计算光子晶体，3D FDTD with 1st Mur boundary conditions
上传时间： 2015-08-11
上传用户：exxxds
用VHDL语言实现数显时钟，devid200.vhd为分频模块，scan.vhd为LED扫描模块，timecount.vhd为计数模块
上传时间： 2013-12-25
上传用户：gtf1207
