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. 圖Figure 1. Local Safety System
標(biāo)簽： FPGA 安全系統(tǒng)
上傳時(shí)間： 2013-11-05
上傳用戶：維子哥哥
用Verilog HDL實(shí)現(xiàn)I2C總線功能
上傳時(shí)間： 2013-11-07
上傳用戶：源弋弋
用FPGA設(shè)計(jì)多功能數(shù)字鐘
上傳時(shí)間： 2013-11-16
上傳用戶：1234567890qqq
一些應(yīng)用利用 Xilinx FPGA 在每次啟動(dòng)時(shí)可改變配置的能力，根據(jù)所需來(lái)改變 FPGA 的功能。Xilinx Platform Flash XCFxxP PROM 的設(shè)計(jì)修訂 (Design Revisioning) 功能，允許用戶在單個(gè)PROM 中將多種配置存儲(chǔ)為不同的修訂版本，從而簡(jiǎn)化了 FPGA 配置更改。在 FPGA 內(nèi)部加入少量的邏輯，用戶就能在 PROM 中存儲(chǔ)的多達(dá)四個(gè)不同的修訂版本之間進(jìn)行動(dòng)態(tài)切換。多重啟動(dòng)或從多個(gè)設(shè)計(jì)修訂進(jìn)行動(dòng)態(tài)重新配置的能力，與 Spartan™-3E FPGA 和第三方并行 flashPROM 一起使用時(shí)所提供的 MultiBoot 選項(xiàng)相似。本應(yīng)用指南將進(jìn)一步說(shuō)明 Platform Flash PROM 如何提供附加選項(xiàng)來(lái)增強(qiáng)配置失敗時(shí)的安全性，以及如何減少引腳數(shù)量和板面積。此外，Platform Flash PROM 還為用戶提供其他優(yōu)勢(shì)：iMPACT 編程支持、單一供應(yīng)商解決方案、低成本板設(shè)計(jì)和更快速的配置加載。本應(yīng)用指南還詳細(xì)地介紹了一個(gè)包含 VHDL 源代碼的參考設(shè)計(jì)。
標(biāo)簽： Platform Flash XAPP PROM
上傳時(shí)間： 2013-10-10
上傳用戶：jackgao
各種功能的計(jì)數(shù)器實(shí)例（VHDL源代碼）:
標(biāo)簽： VHDL 計(jì)數(shù)器 源代碼
上傳時(shí)間： 2013-10-16
上傳用戶：bjgaofei
各種功能的計(jì)數(shù)器實(shí)例（VHDL源代碼）: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;
標(biāo)簽： VHDL 計(jì)數(shù)器 源代碼
上傳時(shí)間： 2014-11-30
上傳用戶：半熟1994
移動(dòng)通信中的短消息是人們無(wú)線溝通的重要方式，更以其方便、可靠性得到廣泛應(yīng)用。針對(duì)嵌入式無(wú)線路由的迅速普及，為實(shí)現(xiàn)良好人機(jī)交互，提出將短消息功能植入可使用上網(wǎng)卡的無(wú)線路由的動(dòng)態(tài)Web中。用C語(yǔ)言進(jìn)行CGI程序設(shè)計(jì)，采用PDU短信模式，實(shí)現(xiàn)無(wú)線路由設(shè)備中短信的收發(fā)。實(shí)驗(yàn)結(jié)果也證實(shí)了此方案的正確性、實(shí)用性和可擴(kuò)展性。
上傳時(shí)間： 2014-01-20
上傳用戶：zhyiroy
CDMA_GSM手機(jī)在線功能測(cè)試
標(biāo)簽： CDMA_GSM 手機(jī) 功能測(cè)試
上傳時(shí)間： 2013-10-18
上傳用戶：283155731
rs485轉(zhuǎn)換功能的一類網(wǎng)卡設(shè)計(jì)與實(shí)現(xiàn)
標(biāo)簽： 485 rs 轉(zhuǎn)換 網(wǎng)卡
上傳時(shí)間： 2013-11-20
上傳用戶：zhuoying119
針對(duì)電力系統(tǒng)傳統(tǒng)的監(jiān)控中心設(shè)備運(yùn)行集中監(jiān)控、輸變電設(shè)備狀態(tài)在線監(jiān)測(cè)與操作功能不能夠滿足現(xiàn)代電網(wǎng)提高駕馭大電網(wǎng)的調(diào)控能力和調(diào)控一體化問題。本文從調(diào)控中心監(jiān)控自動(dòng)化系統(tǒng)與通訊功能出發(fā)，對(duì)監(jiān)控自動(dòng)化系統(tǒng)在無(wú)人值班變電站設(shè)備運(yùn)行集中監(jiān)控與通訊功能中存在的不足進(jìn)行分析，提出完善方案，以提高系統(tǒng)故障隔離的能力，使設(shè)備具備自描述、自適應(yīng)、自診自愈能力，提高駕馭大電網(wǎng)的調(diào)控能力和優(yōu)化配置資源能力，并指出調(diào)控中心未來(lái)發(fā)展方向。
標(biāo)簽： 調(diào)控中心 監(jiān)控 自動(dòng)化系統(tǒng) 通訊
上傳時(shí)間： 2013-11-06
上傳用戶：liujinzhao
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