針對目前使用的RS232接口數(shù)字化B超鍵盤存在PC主機啟動時不能設(shè)置BIOS，提出一種PS2鍵盤的設(shè)計方法。基于W78E052D單片機，采用8通道串行A/D轉(zhuǎn)換器設(shè)計了8個TGC電位器信息采集電路，電位器位置信息以鍵盤掃描碼序列形式發(fā)送，正交編碼器信號通過XC9536XL轉(zhuǎn)換為單片機可接收的中斷信號，軟件接收到中斷信息后等效處理成按鍵。結(jié)果表明，在滿足開機可設(shè)置BIOS同時，又可實現(xiàn)超聲特有功能，不需要專門設(shè)計驅(qū)動程序，接口簡單，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.
上傳時間： 2013-10-10
上傳用戶：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.
上傳時間： 2013-10-18
上傳用戶：masochism
ADAM-5510KW中FPID/PID功能塊之實現(xiàn)及應(yīng)用一、 ADAM-5510KW實現(xiàn)PID控制的方法1、ADAM-5510KW可以使用Multiprog軟件提供的FPID和PID功能塊來實現(xiàn)PID控制。2、ADAM-5510KW對可以使用的PID控制回路并無限制，實際上，取決于Scan Rate，ScanRate越低，則允許的PID回路越多。3、在實際應(yīng)用中，流量、液位、壓力、溫度等等對象都可以進行控制。對于流量、液位、壓力等等參數(shù)可以用傳感器或變送器轉(zhuǎn)換為電壓/電流信號接入模擬量輸入模塊ADAM-5017進行采集；對于溫度可以用熱電偶模塊ADAM-5018或熱電阻模塊ADAM-5013進行采集；輸出的執(zhí)行機構(gòu)例如調(diào)節(jié)閥、風(fēng)扇等等可由模擬量輸出模塊ADAM-5024進行控制。二、 ADAM-5510KW中如何調(diào)用FPID/PID功能塊1、FPID功能塊在ProconOS.fwl庫中，先將庫添加進Project中。
上傳時間： 2013-10-12
上傳用戶：it男一枚
磁盤調(diào)度設(shè)計，磁盤調(diào)度算法的實現(xiàn)，包括 先來先服務(wù)調(diào)度算法 最短尋道優(yōu)先調(diào)度算法 掃描算法 循環(huán)掃描算法 N—Step—SCAN算法
上傳時間： 2015-01-11
上傳用戶：lhw888
鍵盤過濾驅(qū)動，更改scan code
上傳時間： 2014-01-13
上傳用戶：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.
標簽： D. V. MATLABMiroslav Tosicversion
上傳時間： 2015-03-21
上傳用戶：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.
標簽： parallel-plate simulation traveling simple
上傳時間： 2015-04-06
上傳用戶：stella2015
對各種網(wǎng)絡(luò)掃描工具的使用進行了詳細的介紹，Nmap,nessus,x-scan，詳細的命令參考，作為工具手冊之用
標簽： 網(wǎng)絡(luò)掃描
上傳時間： 2015-08-04
上傳用戶：13160677563
fortran程序計算光子晶體，3D FDTD with 1st Mur boundary conditions
上傳時間： 2015-08-11
上傳用戶：exxxds
用VHDL語言實現(xiàn)數(shù)顯時鐘，devid200.vhd為分頻模塊，scan.vhd為LED掃描模塊，timecount.vhd為計數(shù)模塊
上傳時間： 2013-12-25
上傳用戶：gtf1207
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