飞机电网故障时，机载电气盒必须在延迟时间内切断电网，保护机载设备。采用AT89S52设计的电气盒测试仪能够测试电气盒保护功能，测量延迟时间。实际应用结果表明，该测试仪具有测量准确、可靠性高、成本低等优点。 Abstract: The helicopter-electrical-box must shut off the helicopter power，protect the equipments of the helicopter when the helicopter power is failed.The tester for the helicopter-electrical-box based on AT89S52is used for testing the protect-ing function and measuring the delay time.Application results show this tester has some advantages,such as accurate mea-surement,high dependability,economical cost etc.
上传时间： 2014-12-27
上传用户：786334970
将AVR上的队列串口驱动程序修改后，运行在STM32开发板，采用中断方式接收和中断发送，并加入了缓冲收发队列操作。由于该驱动是用来操作西门子的TC35或MC55等通信模块，所以加入了“等待串口接收完成”函数，该函数需要一个10ms的定时进行计数累加。
上传时间： 2013-11-11
上传用户：kaixinxin196
产品简介1.1 产品功能：1.1.1 本产品是手持万用在线编程机的简化版。保留了 ISP/IAP 的核心功能。LCD/键盘/内置存储器、加密性能相应弱化，以降低客户应用成本。1.1.2 下载盒可储存 1 个用户程序代码文件。1.1.3 下载盒可储存 1 个固件代码，分别支持不同系列单片机/ARM 芯片的脱机/离线下载和编程。 1.1.4 可支持意法半导体公司 STM32F系列芯片的脱机 ISP 烧录。1.1.5 支持 STM32F 系列芯片的脱机加密 IAP程序烧录/升级。1.1.6 支持 FreeScale HCS08 系列和 RS08 系列芯片的脱机 BDM 编程。1.1.7 支持 MicroChip 的 PIC12/PIC16/PIC18系列芯片的脱机 ICSP 编程。1.1.8 支持 AVR 系列 8 位单片机的脱机 ISP。1.1.9 本产品将不断升级，支持更多种类和型号的芯片。如果客户需要使用暂不支持的芯片，可向单片机在线编程网提出，本网可在优先开发对应芯片的支持固件。1.1.10 可内置干电池(4 节 7 号)供电，也可用电脑 USB 口供电，或选配USB口电源适配器1.2 产品销售清单：1.2.1 单片机下载盒 1 个。1.2.2 miniUSB 连接线一条。1.2.3 10PIN 转 6PIN 排线一根。1.2.4 说明书一本(即本文件，初期以电子文件形式提供)。1.2.5 10PIN-DB9 串口转换器一个(选配件)。1.2.6 USB 型电源适配器一个(选配件)。
上传时间： 2013-10-10
上传用户：003030
This white paper discusses how market trends, the need for increased productivity, and new legislation have accelerated the use of safety systems in industrial machinery. This TÜV-qualified FPGA design methodology is changing the paradigms of safety designs and will greatly reduce development effort, system complexity, and time to market. This allows FPGA users to design their own customized safety controllers and provides a significant competitive advantage over traditional microcontroller or ASIC-based designs. Introduction The basic motivation of deploying functional safety systems is to ensure safe operation as well as safe behavior in cases of failure. Examples of functional safety systems include train brakes, proximity sensors for hazardous areas around machines such as fast-moving robots, and distributed control systems in process automation equipment such as those used in petrochemical plants. The International Electrotechnical Commission’s standard, IEC 61508: “Functional safety of electrical/electronic/programmable electronic safety-related systems,” is understood as the standard for designing safety systems for electrical, electronic, and programmable electronic (E/E/PE) equipment. This standard was developed in the mid-1980s and has been revised several times to cover the technical advances in various industries. In addition, derivative standards have been developed for specific markets and applications that prescribe the particular requirements on functional safety systems in these industry applications. Example applications include process automation (IEC 61511), machine automation (IEC 62061), transportation (railway EN 50128), medical (IEC 62304), automotive (ISO 26262), power generation, distribution, and transportation. 图Figure 1. Local Safety System
上传时间： 2013-11-05
上传用户：维子哥哥
The standard that governs the design of avioniccomponents and systems, DO-254, is one of the mostpoorly understood but widely applicable standardsin the avionic industry. While information on thegeneral aspects of the standard is easy to obtain, thedetails of exactly how to implement the standard aresketchy. And once an entity develops a process thatachieves compliance, the details of how compliancewas achieved become part of the intellectualproperty of that entity. This white paper focuses onthe details of developing a DO-254 compliantprocess for the design of FPGAs.
上传时间： 2013-11-12
上传用户：q123321
介绍了AES中,SubBytes算法在FPGA的具体实现.构造SubBytes的S-Box转换表可以直接查找ROM表来实现.通过分析SubBytes算法得到一种可行性硬件逻辑电路,从而实现SubBytes变换的功能.
上传时间： 2013-11-30
上传用户：hzy5825468
ref-sdr-sdram-vhdl代码 SDR SDRAM Controller v1.1 readme.txt This readme file for the SDR SDRAM Controller includes information that was not incorporated into the SDR SDRAM Controller White Paper v1.1. The PLL is targeted at APEX(TM) devices. Please regenerate for your chosen architecture. Last updated September, 2002 Copyright ?2002 Altera Corporation. All rights reserved.
上传时间： 2013-11-13
上传用户：takako_yang
This is the Xilinx Dual Processor Reference Designs suite. The designs illustrate a few differentdual-core architectures based on the MicroBlaze™ and PowerPC™ processors. The designsillustrate various concepts described in the Xilinx White Paper WP262 titled, “DesigningMultiprocessor Systems in Platform Studio”. There are simple software applications includedwith the reference designs that show various forms of interaction between the two processors.
上传时间： 2013-10-29
上传用户：旭521
This white paper discusses how market trends, the need for increased productivity, and new legislation have accelerated the use of safety systems in industrial machinery. This TÜV-qualified FPGA design methodology is changing the paradigms of safety designs and will greatly reduce development effort, system complexity, and time to market. This allows FPGA users to design their own customized safety controllers and provides a significant competitive advantage over traditional microcontroller or ASIC-based designs. Introduction The basic motivation of deploying functional safety systems is to ensure safe operation as well as safe behavior in cases of failure. Examples of functional safety systems include train brakes, proximity sensors for hazardous areas around machines such as fast-moving robots, and distributed control systems in process automation equipment such as those used in petrochemical plants. The International Electrotechnical Commission’s standard, IEC 61508: “Functional safety of electrical/electronic/programmable electronic safety-related systems,” is understood as the standard for designing safety systems for electrical, electronic, and programmable electronic (E/E/PE) equipment. This standard was developed in the mid-1980s and has been revised several times to cover the technical advances in various industries. In addition, derivative standards have been developed for specific markets and applications that prescribe the particular requirements on functional safety systems in these industry applications. Example applications include process automation (IEC 61511), machine automation (IEC 62061), transportation (railway EN 50128), medical (IEC 62304), automotive (ISO 26262), power generation, distribution, and transportation. 图Figure 1. Local Safety System
上传时间： 2013-11-14
上传用户：zoudejile
收文单位：左列各单位 发文字号： MT-8-2-0037
上传时间： 2013-10-28
上传用户：ming529
