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PARITY-Codes

  • DAC技術(shù)用語(yǔ) (D/A Converters Defini

    Differential Nonlinearity: Ideally, any two adjacent digitalcodes correspond to output analog voltages that are exactlyone LSB apart. Differential non-linearity is a measure of theworst case deviation from the ideal 1 LSB step. For example,a DAC with a 1.5 LSB output change for a 1 LSB digital codechange exhibits 1⁄2 LSB differential non-linearity. Differentialnon-linearity may be expressed in fractional bits or as a percentageof full scale. A differential non-linearity greater than1 LSB will lead to a non-monotonic transfer function in aDAC.Gain Error (Full Scale Error): The difference between theoutput voltage (or current) with full scale input code and theideal voltage (or current) that should exist with a full scale inputcode.Gain Temperature Coefficient (Full Scale TemperatureCoefficient): Change in gain error divided by change in temperature.Usually expressed in parts per million per degreeCelsius (ppm/°C).Integral Nonlinearity (Linearity Error): Worst case deviationfrom the line between the endpoints (zero and full scale).Can be expressed as a percentage of full scale or in fractionof an LSB.LSB (Lease-Significant Bit): In a binary coded system thisis the bit that carries the smallest value or weight. Its value isthe full scale voltage (or current) divided by 2n, where n is theresolution of the converter.Monotonicity: A monotonic function has a slope whose signdoes not change. A monotonic DAC has an output thatchanges in the same direction (or remains constant) for eachincrease in the input code. the converse is true for decreasing codes.

    標(biāo)簽: Converters Defini DAC

    上傳時(shí)間: 2013-10-30

    上傳用戶:stvnash

  • 基于單片機(jī)系統(tǒng)的(24,16)循環(huán)碼編碼、譯碼方案

      在理論分析循環(huán)碼編碼和譯碼基本原理的基礎(chǔ)上,提出了基于單片機(jī)系統(tǒng)的(24,16)循環(huán)碼軟件實(shí)現(xiàn)編碼、譯碼的方案。仿真結(jié)果表明(24,16)循環(huán)碼能有效地克服來(lái)自通訊信道的干擾,保證數(shù)據(jù)通信的可靠及系統(tǒng)的穩(wěn)定,使誤碼率大幅度降低。本論文對(duì)(24,16)循環(huán)碼的研究結(jié)果表明,可以有效地降低錯(cuò)誤概率和提高系統(tǒng)的吞吐量,實(shí)現(xiàn)糾錯(cuò)僅需要在接收端增加有限的存儲(chǔ)空間和計(jì)算復(fù)雜度,具有一定的實(shí)用價(jià)值。   Abstract:   Based on analyzing the theory of encoding and decoding of cyclic code, this paper showed the schemes of encoding and decoding of(24,16)cyclic code by the software and based on microcontroller. Simulation results show that using (24,16) cyclic codes can effectively overcome the interference from communication channel, ensure the reliability and stability of data communication systems, and reduce the bit error rate greatly. The results of this paper show that by using the (24,16) cyclic code, the error rate can be reduced and the system throughput can be improved. Meanwhile, the system only needs to enlarge limited storage space and computation the complexity at the receiving end to realize error correction. Thus the (24,16) cyclic code has a practical value.  

    標(biāo)簽: 24 16 單片機(jī)系統(tǒng) 循環(huán)碼

    上傳時(shí)間: 2013-11-09

    上傳用戶:gaoliangncepu

  • 基于MSP430的指紋保險(xiǎn)柜的實(shí)現(xiàn)

    在介紹基于MSP430單片機(jī)的指紋保險(xiǎn)柜工作原理的基礎(chǔ)上,從系統(tǒng)軟件設(shè)計(jì)的角度出發(fā),詳細(xì)介紹了指紋保險(xiǎn)柜軟件的總體分析過(guò)程、程序結(jié)構(gòu)的設(shè)計(jì)以及代碼的編寫,給出了按鍵管理流程和部分源代碼。 Abstract:  On basis of the operating principle of MSP430 microcontroller-based fingerprint safe,the general analyzing process,program designing and code compiling of the fingerprint safe software are introduced mainly,and the key-press flows chart and some codes according to the system software designing are put forward.

    標(biāo)簽: MSP 430 指紋 保險(xiǎn)

    上傳時(shí)間: 2014-12-27

    上傳用戶:gaojiao1999

  • 開放式匯編器系統(tǒng)的設(shè)計(jì)

    匯編器在微處理器的驗(yàn)證和應(yīng)用中舉足輕重,如何設(shè)計(jì)通用的匯編器一直是研究的熱點(diǎn)之一。本文提出了一種開放式的匯編器系統(tǒng)設(shè)計(jì)思想,在匯編語(yǔ)言與機(jī)器語(yǔ)言間插入中間代碼CMDL(code mapping description language)語(yǔ)言,打破匯編語(yǔ)言與機(jī)器語(yǔ)言的直接映射關(guān)系,由此建立起一套描述匯編語(yǔ)言與機(jī)器語(yǔ)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

    標(biāo)簽: 開放式 匯編器

    上傳時(shí)間: 2013-10-10

    上傳用戶:meiguiweishi

  • 最詳細(xì)的NIOSII教程

      核心板配置    核心板配置癿FPGA芯片是Cyclone II系列癿EP2C8Q208C,具有8256個(gè)LEs,36個(gè)M4K RAM blocks (4Kbits plus 512 parity bits),同時(shí)具有165,888bit癿RAM,支持18個(gè)Embedded multipliers和2個(gè)PLL,資源配備十分豐富。實(shí)驗(yàn)證明,返款芯片在嵌入NIOS II軟核將黑釐開収板癿所有外謳全部跑起來(lái),僅占全部資源癿70-80% ;    核心板同時(shí)配備了64Mbit癿SDRAM,對(duì)亍運(yùn)行NIOS軟核提供了有力癿保障,返款芯片為時(shí)鐘頻率有143MHz,實(shí)驗(yàn)證明,NIOS II軟核主頻可以平穩(wěn)運(yùn)行120MHz,速度迓是相當(dāng)忚癿;    16Mbit癿配置芯片也為返款核心板增色丌少,丌僅可以存儲(chǔ)配置信息,同時(shí)迓可以實(shí)現(xiàn)NIOS II軟件程序存儲(chǔ),你編寫癿程序再大也沒有后頊乀憂了。    20M癿有源晶振也是必丌可少癿,他是整個(gè)系統(tǒng)癿時(shí)鐘源泉;4個(gè)LED對(duì)亍調(diào)試來(lái)說(shuō)更是提供了徑多方便;復(fù)位按鍵,重新配置按鍵,配置指示燈一個(gè)也丌能少;同時(shí)支持AS模式和JTAG模式;    除此以外,核心板一個(gè)更大的特點(diǎn)是它可以獨(dú)立亍底板單獨(dú)運(yùn)行,為此配備了5V癿電源接口,高質(zhì)量癿紅色開關(guān),為了安全迓加入了自恢復(fù)保險(xiǎn)絲。當(dāng)然擴(kuò)展口是丌能少癿,除了SDRAM占用癿38個(gè)IO口外,其他100個(gè)IO全部擴(kuò)展出來(lái),為大家可以迕行自我擴(kuò)展實(shí)驗(yàn)做好了充分癿準(zhǔn)備。   四、 下擴(kuò)展板配置   為了讓FPGA収揮它癿強(qiáng)大功能,黑釐開収板為其謳計(jì)一款資源豐富癿下擴(kuò)展板(乀所以叨下擴(kuò)展板,是因?yàn)槲覀兒罄m(xù)迓會(huì)有上擴(kuò)展板)。下面我們就來(lái)簡(jiǎn)單介終一下下擴(kuò)展板癿資源配置。    支持網(wǎng)絡(luò)功能,配置ENC28J60網(wǎng)口芯片。ENC28J60是Microchip Technology(美國(guó)微芯科技公司)推出癿28引腳獨(dú)立以太網(wǎng)控刢器。目前市場(chǎng)上大部分以太網(wǎng)控刢器癿封裝均赸過(guò)80引腳,而符吅IEEE 802.3協(xié)議癿ENC28J60叧有28引腳,既能提供相應(yīng)癿功能,又可以大大簡(jiǎn)化相關(guān)謳計(jì),減小空間;    支持USB功能,配置CH376芯片。CH376 支持USB 謳備方式和USB 主機(jī)方式,幵丏內(nèi)置了USB 途訊協(xié)議癿基本固件,內(nèi)置了處理Mass-Storage海量存儲(chǔ)謳備癿與用途訊協(xié)議癿固件,內(nèi)置了SD 卡癿途訊接口固件,內(nèi)置了FAT16和FAT32 以及FAT12 文件系統(tǒng)癿管理固件,支持常用癿USB 存儲(chǔ)謳備(包括U 盤/USB 硬盤/USB 閃存盤/USB 讀卡器)和SD 卡(包括標(biāo)準(zhǔn)容量SD 卡和高容量HC-SD 卡以及協(xié)議兼容癿MMC 卡和TF 卡);    支持板載128*64的點(diǎn)陣LCD。ST7565P控刢芯片,內(nèi)置DC/DC電路,途過(guò)軟件調(diào)節(jié)對(duì)比度。該芯片支持,幵口和串口丟種方式;

    標(biāo)簽: NIOSII 教程

    上傳時(shí)間: 2013-11-23

    上傳用戶:ouyangtongze

  • 基于ARM的遠(yuǎn)程無(wú)線視頻監(jiān)控終端設(shè)計(jì)

    提出了一種以ARM微處理器為控制核心的遠(yuǎn)程無(wú)線視頻監(jiān)控終端的設(shè)計(jì)方案,其監(jiān)控終端的硬件設(shè)計(jì)包括視頻采集處理、中央管理控制、無(wú)線傳輸3個(gè)模塊。并給出了監(jiān)控終端的軟件開發(fā)平臺(tái)和開發(fā)模式的系統(tǒng)啟動(dòng)代碼、嵌入式Linux系統(tǒng)移植以及驅(qū)動(dòng)程序和應(yīng)用程序。測(cè)試結(jié)果表明,該監(jiān)控終端設(shè)計(jì)方案合理、有效,基本滿足監(jiān)控需求。 Abstract:  A remote wireless video monitoring terminal design, which uses ARM microprocessor as its core control, is proposed in this paper.The hardware design of monitoring terminal system is composed of the video acquisition and processing module, the central management and control module, wireless transmission module.Meanwhile the monitoring terminal-s software development platform and development patterns are designed. Also the design of the system-s start codes, embedded Linux system-s transplantation process, driver and the corresponding applications are given. The results showed that the monitoring terminal design is reasonable, effective, basically meet monitoring requirements.

    標(biāo)簽: ARM 遠(yuǎn)程無(wú)線 視頻監(jiān)控 終端設(shè)計(jì)

    上傳時(shí)間: 2013-11-13

    上傳用戶:wanqunsheng

  • 基于(英蓓特)STM32V100的串口程序

    This example provides a description of how  to use the USART with hardware flowcontrol and communicate with the Hyperterminal.First, the USART2 sends the TxBuffer to the hyperterminal and still waiting fora string from the hyperterminal that you must enter which must end by '\r'character (keypad ENTER button). Each byte received is retransmitted to theHyperterminal. The string that you have entered is stored in the RxBuffer array. The receivebuffer have a RxBufferSize bytes as maximum. The USART2 is configured as follow:    - BaudRate = 115200 baud      - Word Length = 8 Bits    - One Stop Bit    - No parity    - Hardware flow control enabled (RTS and CTS signals)    - Receive and transmit enabled    - USART Clock disabled    - USART CPOL: Clock is active low    - USART CPHA: Data is captured on the second edge     - USART LastBit: The clock pulse of the last data bit is not output to                      the SCLK pin

    標(biāo)簽: V100 STM 100 32V

    上傳時(shí)間: 2013-10-31

    上傳用戶:yy_cn

  • This is a package to calculate Discrete Fourier/Cosine/Sine Transforms of 1-dimensional sequences of

    This is a package to calculate Discrete Fourier/Cosine/Sine Transforms of 1-dimensional sequences of length 2^N. This package contains C and Fortran FFT codes.

    標(biāo)簽: dimensional Transforms calculate sequences

    上傳時(shí)間: 2014-01-14

    上傳用戶:LIKE

  • 物流分析工具包。Facility location: Continuous minisum facility location, alternate location-allocation (ALA)

    物流分析工具包。Facility location: Continuous minisum facility location, alternate location-allocation (ALA) procedure, discrete uncapacitated facility location Vehicle routing: VRP, VRP with time windows, traveling salesman problem (TSP) Networks: Shortest path, min cost network flow, minimum spanning tree problems Geocoding: U.S. city or ZIP code to longitude and latitude, longitude and latitude to nearest city, Mercator projection plotting Layout: Steepest descent pairwise interchange (SDPI) heuristic for QAP Material handling: Equipment selection General purpose: Linear programming using the revised simplex method, mixed-integer linear programming (MILP) branch and bound procedure Data: U.S. cities with populations of at least 10,000, U.S. highway network (Oak Ridge National Highway Network), U.S. 3- and 5-digit ZIP codes

    標(biāo)簽: location location-allocation Continuous alternate

    上傳時(shí)間: 2015-05-17

    上傳用戶:kikye

  • Unzip this file into a writeable directory. You should end up with a "Geocode" project, as well as

    Unzip this file into a writeable directory. You should end up with a "Geocode" project, as well as Bitmaps and TestData directories. This sample geocodes single-match zip codes, entered by the user, or a batch-match of a table of zips (and other info) against a point shapefile. The point data shapefile consists of 41859 point features from 1996 GDT data, in decimal degrees. The table of zips that can be used in the batch match consists of 38 records, entitled "few_zips.dbf". More specifcs are found at the top of each form and are provided throughout the code.

    標(biāo)簽: directory writeable Geocode project

    上傳時(shí)間: 2013-12-19

    上傳用戶:wangchong

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