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
用Verilog HDL实现I2C总线功能
上传时间： 2013-11-07
上传用户：源弋弋
用FPGA设计多功能数字钟
上传时间： 2013-11-16
上传用户：1234567890qqq
一些应用利用 Xilinx FPGA 在每次启动时可改变配置的能力，根据所需来改变 FPGA 的功能。Xilinx Platform Flash XCFxxP PROM 的设计修订 (Design Revisioning) 功能，允许用户在单个PROM 中将多种配置存储为不同的修订版本，从而简化了 FPGA 配置更改。在 FPGA 内部加入少量的逻辑，用户就能在 PROM 中存储的多达四个不同的修订版本之间进行动态切换。多重启动或从多个设计修订进行动态重新配置的能力，与 Spartan™-3E FPGA 和第三方并行 flashPROM 一起使用时所提供的 MultiBoot 选项相似。本应用指南将进一步说明 Platform Flash PROM 如何提供附加选项来增强配置失败时的安全性，以及如何减少引脚数量和板面积。此外，Platform Flash PROM 还为用户提供其他优势：iMPACT 编程支持、单一供应商解决方案、低成本板设计和更快速的配置加载。本应用指南还详细地介绍了一个包含 VHDL 源代码的参考设计。
上传时间： 2013-10-10
上传用户：jackgao
各种功能的计数器实例（VHDL源代码）:
上传时间： 2013-10-16
上传用户：bjgaofei
各种功能的计数器实例（VHDL源代码）:ENTITY counters IS PORT ( d : IN INTEGER RANGE 0 TO 255; clk : IN BIT; clear : IN BIT; ld : IN BIT; enable : IN BIT; up_down : IN BIT; qa : OUT INTEGER RANGE 0 TO 255; qb : OUT INTEGER RANGE 0 TO 255; qc : OUT INTEGER RANGE 0 TO 255; qd : OUT INTEGER RANGE 0 TO 255; qe : OUT INTEGER RANGE 0 TO 255; qf : OUT INTEGER RANGE 0 TO 255; qg : OUT INTEGER RANGE 0 TO 255; qh : OUT INTEGER RANGE 0 TO 255; qi : OUT INTEGER RANGE 0 TO 255;
上传时间： 2014-11-30
上传用户：半熟1994
移动通信中的短消息是人们无线沟通的重要方式，更以其方便、可靠性得到广泛应用。针对嵌入式无线路由的迅速普及，为实现良好人机交互，提出将短消息功能植入可使用上网卡的无线路由的动态Web中。用C语言进行CGI程序设计，采用PDU短信模式，实现无线路由设备中短信的收发。实验结果也证实了此方案的正确性、实用性和可扩展性。
上传时间： 2014-01-20
上传用户：zhyiroy
CDMA_GSM手机在线功能测试
上传时间： 2013-10-18
上传用户：283155731
rs485转换功能的一类网卡设计与实现
上传时间： 2013-11-20
上传用户：zhuoying119
针对电力系统传统的监控中心设备运行集中监控、输变电设备状态在线监测与操作功能不能够满足现代电网提高驾驭大电网的调控能力和调控一体化问题。本文从调控中心监控自动化系统与通讯功能出发，对监控自动化系统在无人值班变电站设备运行集中监控与通讯功能中存在的不足进行分析，提出完善方案，以提高系统故障隔离的能力，使设备具备自描述、自适应、自诊自愈能力，提高驾驭大电网的调控能力和优化配置资源能力，并指出调控中心未来发展方向。
上传时间： 2013-11-06
上传用户：liujinzhao
