匯編器在微處理器的驗證和應(yīng)用中舉足輕重，如何設(shè)計通用的匯編器一直是研究的熱點之一。本文提出了一種開放式的匯編器系統(tǒng)設(shè)計思想，在匯編語言與機器語言間插入中間代碼CMDL（code mapping description language）語言，打破匯編語言與機器語言的直接映射關(guān)系，由此建立起一套描述匯編語言與機器語言的開放式映射體系。基于此開放式映射體系開發(fā)了一套匯編器系統(tǒng)，具有較高層次上的通用性和可移植性。【關(guān)鍵詞】指令集，CMDL，匯編器，開放式 Design of Retargetable Assembler System Liu Ling Feng Wen Nan Wang Ying Chun Jiang An Ping Ji Li Jiu IME of Peking University, 100871【摘要】An assembler plays a very important role in the field of microprocessor verifications and applications, thus how to build a retargetable assembler system has been a hotspot in this field for long time. This paper presents a new method about the retargetable assembler system design.It provides a kind of language CMDL, code mapping description language. During the process of assembling, assembler languages are firstly translated to CMDL, and then mapped to the machine codes. In an other word, CMDL is inserted between assembler languages and machine codes during the translation procedure. As a medium code, CMDL has a lot of features, such as high extraction, strong descript capabilities. It can describe almost all attributes of assembler languages. By breaking the direct mapping relationship between assembler languages and machine codes, the complexities of machine codes are hided to the users, therefore, the new retargetable assembler system has higher retargetable level by converting the mapping from assembler languages and machine codes to assembler languages and CMDL, and implementationof it becomes easier. Based on the new mapping system structure, a retargetable assemblersystem is developed. It proved the whole system has good retargetability and implantability.【關(guān)鍵詞】instruction set, symbol table, assembler, lexical analysis, retargetability
上傳時間： 2013-10-10
上傳用戶：meiguiweishi
基于單片機的除塵控制器的設(shè)計:介紹通用控制儀的硬件組成和軟件設(shè)計,闡述了系統(tǒng)的性能指標和功能特點。該產(chǎn)品功能完善,可靠性高,具有很好的應(yīng)用前景。關(guān)鍵詞: 除塵器;通用控制儀;單片機;系統(tǒng)設(shè)計 Abstract: The hardware structure and the software design are introduced in this paper, and the performance index and the features of the system are expounded. It has comp rehensive functions, high reliability and good app lication.Key words: dust catcher; universal controller; microcontroller; system design
上傳時間： 2013-11-16
上傳用戶：ming52900
The Motorola MPC106 PCI bridge/memory controller provides a PowerPCªmicroprocessor common hardware reference platform (CHRPª) compliant bridgebetween the PowerPC microprocessor family and the Peripheral Component Interconnect(PCI) bus. In this document, the term Ô106Õ is used as an abbreviation for the phraseÔMPC106 PCI bridge/memory controllerÕ. This document contains pertinent physicalcharacteristics of the 106. For functional characteristics refer to theMPC106 PCI Bridge/Memory Controller UserÕs Manual.This document contains the following topics:Topic PageSection 1.1, ÒOverviewÓ 2Section 1.2, ÒFeaturesÓ 3Section 1.3, ÒGeneral ParametersÓ 5Section 1.4, ÒElectrical and Thermal CharacteristicsÓ 5Section 1.5, ÒPin AssignmentsÓ 17Section 1.6, ÒPinout Listings 18Section 1.7, ÒPackage DescriptionÓ 22Section 1.8, ÒSystem Design InformationÓ 24Section 1.9, ÒDocument Revision HistoryÓ 29Section 1.10, ÒOrdering InformationÓ 29
上傳時間： 2013-11-04
上傳用戶：as275944189
設(shè)計一種應(yīng)用于某全地形ATV車載武器裝置中的中控系統(tǒng)，該系統(tǒng)設(shè)計是以TMS320F2812型DSP為核心，采用模塊化設(shè)計思想，對其硬件部分進行系統(tǒng)設(shè)計，能夠完成對武器裝置高低、回轉(zhuǎn)方向的運動控制，實現(xiàn)靜止或行進狀態(tài)中對目標物的測距，自動瞄準以及按既定發(fā)射模式發(fā)射彈丸和各項安全性能檢測等功能。通過編制相應(yīng)的軟件，對其進行系統(tǒng)調(diào)試，驗證了該設(shè)計運行穩(wěn)定。 Abstract: A central control system applied to an ATV vehicle weapons is designed. The system design is based on TMS320F2812 DSP as the core， uses modular design for its hardware parts. The central control system can complete the motion control of the level of weapons and equipment， rotation direction， to achieve a state of static or moving objects on the target ranging， auto-targeting and according to the established target and the projectile and the launch of the security performance testing and other functions. Through the development of appropriate software and to carry out system testing to verify the stability of this design and operation.
標簽： ATV-ATT DSP 中控系統(tǒng)
上傳時間： 2013-11-02
上傳用戶：jshailingzzh
Field Programmable Gate Arrays (FPGAs) are becoming a critical part of every system design. Many vendors offer many different architectures and processes. Which one is right for your design? How do you design one of these so that it works correctly and functions as you expect in your entire system? These are the questions that this paper sets out to answer.
上傳時間： 2013-10-29
上傳用戶：lixqiang
嵌入式系統(tǒng)（Embedded System）是以應(yīng)用為中心，以計算機技術(shù)為基礎(chǔ)，并且軟硬件是可裁剪的，適用于對功能、可靠性、成本、體積、功耗等有嚴格要求的專用計算機系統(tǒng)。嵌入式系統(tǒng)最典型的特點是與人們的日常生活緊密相關(guān)，任何一個普通人都可能擁有各類形形色色運用了嵌入式技術(shù)的電子產(chǎn)品，小到MP3、PDA等微型數(shù)字化設(shè)備，大到信息家電、智能電器、車載GIS。 雖然嵌入式系統(tǒng)是近幾年才開始真正風(fēng)靡起來的，但事實上嵌入式這個概念卻很早就已經(jīng)存在了，從上個世紀70年代單片機的出現(xiàn)到今天各種嵌入式微處理器、微控制器的廣泛應(yīng)用，嵌入式系統(tǒng)少說也有了近30年的歷史。縱觀嵌入式系統(tǒng)的發(fā)展歷程，大致經(jīng)歷了以下四個階段：
上傳時間： 2014-12-29
上傳用戶：wangzeng
嵌入式系統(tǒng)（Embedded system）也稱嵌入式計算機系統(tǒng)。顧名思義，嵌入式系統(tǒng)是計算機的一種特殊形式，所以在理解嵌入式系統(tǒng)概念前，必須先明確計算機的基本概念。計算機是能按照指令對各種數(shù)據(jù)進行自動加工處理的電子設(shè)備，一套完整的計算機系統(tǒng)包括硬件和軟件兩個部分。軟件是指令與數(shù)據(jù)的集合，而硬件則是執(zhí)行指令和處理數(shù)據(jù)的環(huán)境平臺，是那些看得見、摸得著的部件。計算機的硬件系統(tǒng)主要由中央處理器（CPU）、存儲器、外部設(shè)備以及連接各個部分的計算機總線組成。
標簽： 嵌入式 系統(tǒng)原理
上傳時間： 2013-11-23
上傳用戶：qwerasdf
Abstract: This article discusses the benefits of a G3-PLC-based automation system and presents a real-world example of a systemfor reducing energy usage and lowering maintenance costs in tunnels. The basic system design is explained and key performance
標簽： 路燈 電力線通信 自動化系統(tǒng)
上傳時間： 2013-10-29
上傳用戶：康郎
在研究傳統(tǒng)家用燃氣報警器的基礎(chǔ)上，以ZigBee協(xié)議為平臺，構(gòu)建mesh網(wǎng)狀網(wǎng)絡(luò)實現(xiàn)網(wǎng)絡(luò)化的智能語音報警系統(tǒng)。由于傳感器本身的溫度和實際環(huán)境溫度的影響，傳感器標定后采用軟件補償方法。為了減少系統(tǒng)費用，前端節(jié)點采用半功能節(jié)點設(shè)備，路由器和協(xié)調(diào)器采用全功能節(jié)點設(shè)備，構(gòu)建mesh網(wǎng)絡(luò)所形成的家庭內(nèi)部報警系統(tǒng)，通過通用的電話接口連接到外部的公用電話網(wǎng)絡(luò)，啟動語音模塊進行報警。實驗結(jié)果表明，在2.4 GHz頻率下傳輸，有墻等障礙物的情況下，節(jié)點的傳輸距離大約為35 m，能夠滿足家庭需要，且系統(tǒng)工作穩(wěn)定，但在功耗方面仍需進一步改善。 Abstract: On the basis of studying traditional household gas alarm system, this paper proposed the platform for the ZigBee protocol，and constructed mesh network to achieve network-based intelligent voice alarm system. Because of the sensor temperature and the actual environment temperature, this system design used software compensation after calibrating sensor. In order to reduce system cost, semi-functional node devices were used as front-end node, however, full-function devices were used as routers and coordinator，constructed alarm system within the family by building mesh network，connected to the external public telephone network through the common telephone interface, started the voice alarm module. The results indicate that nodes transmit about 35m in the distance in case of walls and other obstacles by 2.4GHz frequency transmission, this is able to meet family needs and work steadily, but still needs further improvement in power consumption.
標簽： ZigBee 無線智能 家 報警系統(tǒng)
上傳時間： 2013-10-30
上傳用戶：swaylong
為了能夠滿足基站易于選址、優(yōu)質(zhì)快速的建站要求和易維護、低成本、高可靠的運行要求，本文對以方艙來實現(xiàn)一體化結(jié)構(gòu)基站做出一番探討。從系統(tǒng)設(shè)計的觀點闡述了移動通信高性能基站天線設(shè)計的幾個關(guān)鍵問題，介紹了智能天線技術(shù)在基站中的應(yīng)用，并且用HFSS軟件仿真了一種新型的對稱陣子天線，該天線駐波比小于2的帶寬可以達到60%，具有良好的寬頻帶特性。 Abstract: In order to meet the station construction requirement of easy site selection and fast base station， and meet the operational requirement of easy maintenance， low cost and high reliability， this paper discussed the unified architecture base station using shelter. Several key problems of high performance mobile communication base station antenna were illustrated from the view of system design， the application of smart antenna in base station was also introduced. And a novel dipole antenna was simulated by using HFSS， the VSWR of the antenna is less than 2， and the bandwidth was reach to 60%. So it has good broadband properties.
標簽： 智能天線 基站 中的應(yīng)用
上傳時間： 2013-11-20
上傳用戶：linlin
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