Most designers wish to utilize as much of a device as possible in order to enhance the overallproduct performance, or extend a feature set. As a design grows, inevitably it will exceed thearchitectural limitations of the device. Exactly why a design does not fit can sometimes bedifficult to determine. Programmable logic devices can be configured in almost an infinitenumber of ways. The same design may fit when you use certain implementation switches, andfail to fit when using other switches. This application note attempts to clarify the CPLD softwareimplementation (CPLDFit) options, as well as discuss implementation tips in CoolRunnerTM-IIdesigns in order to maximize CPLD utilization.
上傳時間： 2014-01-11
上傳用戶：a471778
This application note covers the design considerations of a system using the performance features of the LogiCORE™ IP Advanced eXtensible Interface (AXI) Interconnect core. The design focuses on high system throughput through the AXI Interconnect core with F MAX and area optimizations in certain portions of the design. The design uses five AXI video direct memory access (VDMA) engines to simultaneously move 10 streams (five transmit video streams and five receive video streams), each in 1920 x 1080p format, 60 Hz refresh rate, and up to 32 data bits per pixel. Each VDMA is driven from a video test pattern generator (TPG) with a video timing controller (VTC) block to set up the necessary video timing signals. Data read by each AXI VDMA is sent to a common on-screen display (OSD) core capable of multiplexing or overlaying multiple video streams to a single output video stream. The output of the OSD core drives the DVI video display interface on the board. Performance monitor blocks are added to capture performance data. All 10 video streams moved by the AXI VDMA blocks are buffered through a shared DDR3 SDRAM memory and are controlled by a MicroBlaze™ processor. The reference system is targeted for the Virtex-6 XC6VLX240TFF1156-1 FPGA on the Xilinx® ML605 Rev D evaluation board
上傳時間： 2013-11-23
上傳用戶：shen_dafa
反復(fù)提示需要重新啟動：在”運行“，輸入”Regedit“打開注冊表， 出如下的注冊表鍵值”HKEY_LOCAL_MACHINE\SYSTEM\CurrentControl Set\Control\Session Manager\PendingFileRenameOperations” 顯示出錯消息1645”安裝Microsoft Net Framework”時出錯，返回代碼1601，安裝被取消：用戶的操作系統(tǒng)DCOM組態(tài)出錯。在“運行”中，輸入“dcomcnfg.exe”回車。在彈出的DCOM組態(tài)屬性設(shè)置對話框的”標準屬性“選項卡中，不要同時選擇”缺省驗證級別“＝”無”和“缺省身份更改級別‘＝”隱名’。
上傳時間： 2013-11-22
上傳用戶：myworkpost
三菱FX-PLC 的通訊協(xié)議參考(含有源碼):三菱FX 系列PLC 專用協(xié)議通信指令一覽FX 系列PLC 專用協(xié)議通信指令一覽以下將詳細列出PLC 專用協(xié)議通信的指令指令 注釋BR 以1 點為單位，讀出位元件的狀態(tài)WR 以16 點為單位，讀出位元件的狀態(tài)，或以1 字為單位讀出字元件的值BW 以1 點為單位，寫入位元件的狀態(tài)WW 以16 點為單位，寫入位元件的狀態(tài)或以1 字為單位寫入值到字元件BT 以1 點為單位，SET/RESET 位元件WT 以16 點為單位，SET/RESET 位元件，或?qū)懭胫档阶衷R 控制PLC 運行RUNRS 控制PLC 停止STOPPC 讀出PLC 設(shè)備類型TT 連接測試注：位元件包括X,Y,M,S 以及T,C 的線圈等字元件包括D,T,C,KnX,KnY,KnM 等。
上傳時間： 2015-01-02
上傳用戶：gdgzhym
Accurate measurement of the third order intercept pointfor low distortion IC products such as the LT5514 requirescertain precautions to be observed in the test setup andtesting procedure. The LT5514 linearity performance ishigh enough to push the test equipment and test set-up totheir limits. A method for accurate measurement of thirdorder intermodulation products, IM3, with standard testequipment is outlined below.It is also important to correctly interpret the LT5514specification with respect to ROUT, and the impact ofdemo-board transmission-line termination loss whenevaluating the linearity performance, as explained in theLT5514 Datasheet and in Note 1 of this document.
標簽： 5514 LT 三階互調(diào) 精確測量
上傳時間： 2013-11-14
上傳用戶：l254587896
用途：測量地磁方向，測量物體靜止時候的方向，測量傳感器周圍磁力線的方向。注意，測量地磁時候容易受到周圍磁場影響，主芯片HMC5883 三軸磁阻傳感器特點（抄自網(wǎng)上）： 1，數(shù)字量輸出：I2C 數(shù)字量輸出接口，設(shè)計使用非常方便。 2，尺寸小: 3x3x0.9mm LCC 封裝，適合大規(guī)模量產(chǎn)使用。 3，精度高：1－2 度，內(nèi)置12 位A/D,OFFSET, SET/RESET 電路，不會出現(xiàn)磁飽和現(xiàn)象，不會有累加誤差。 4，支持自動校準程序，簡化使用步驟，終端產(chǎn)品使用非常方便。 5，內(nèi)置自測試電路，方便量產(chǎn)測試，無需增加額外昂貴的測試設(shè)備。 6，功耗低：供電電壓1.8V, 功耗睡眠模式-2.5uA 測量模式-0.6mA 連接方法： 只要連接VCC，GND，SDA，SDL 四條線。 Arduino GND -> HMC5883L GND Arduino 3.3V -> HMC5883L VCC Arduino A4 (SDA) -> HMC5883L SDA Arduino A5 (SCL) -> HMC5883L SCL (注意，接線是A4，A5，不是D4,D5) 源程序： #include <Wire.h> #include <HMC5883L.h> HMC5883Lcompass; voidsetup() { Serial.begin(9600); Wire.begin(); compass = HMC5883L(); compass.SetScale(1.3); compass.SetMeasurementMode(Measurement_Continuous); } voidloop() { MagnetometerRaw raw = compass.ReadRawAxis(); MagnetometerScaled scaled = compass.ReadScaledAxis(); float xHeading = atan2(scaled.YAxis, scaled.XAxis); float yHeading = atan2(scaled.ZAxis, scaled.XAxis); float zHeading = atan2(scaled.ZAxis, scaled.YAxis); if(xHeading < 0) xHeading += 2*PI; if(xHeading > 2*PI) xHeading -= 2*PI; if(yHeading < 0) yHeading += 2*PI; if(yHeading > 2*PI) yHeading -= 2*PI; if(zHeading < 0) zHeading += 2*PI; if(zHeading > 2*PI) zHeading -= 2*PI; float xDegrees = xHeading * 180/M_PI; float yDegrees = yHeading * 180/M_PI; float zDegrees = zHeading * 180/M_PI; Serial.print(xDegrees); Serial.print(","); Serial.print(yDegrees); Serial.print(","); Serial.print(zDegrees); Serial.println(";"); delay(100); }
上傳時間： 2014-03-20
上傳用戶：tianyi223
簡單的session類，用于手機短信應(yīng)用。主要包括setAttribute（），getAttribute(), removeSession()個方法，set方法在沒有session時自動建立一個session.
標簽： session
上傳時間： 2015-01-07
上傳用戶：xiaohuanhuan
最新的支持向量機工具箱，有了它會很方便 1. Find time to write a proper list of things to do! 2. Documentation. 3. Support Vector Regression. 4. Automated model selection. REFERENCES ========== [1] V.N. Vapnik, "The Nature of Statistical Learning Theory", Springer-Verlag, New York, ISBN 0-387-94559-8, 1995. [2] J. C. Platt, "Fast training of support vector machines using sequential minimal optimization", in Advances in Kernel Methods - Support Vector Learning, (Eds) B. Scholkopf, C. Burges, and A. J. Smola, MIT Press, Cambridge, Massachusetts, chapter 12, pp 185-208, 1999. [3] T. Joachims, "Estimating the Generalization Performance of a SVM Efficiently", LS-8 Report 25, Universitat Dortmund, Fachbereich Informatik, 1999.
上傳時間： 2013-12-16
上傳用戶：亞亞娟娟123
單片機最小系統(tǒng)，兩位LED數(shù)碼管由串口輸出接兩個164驅(qū)動，Lout,Rout為左右聲道輸出，SET， ALT0， ALT1為三個按鍵，也可自己在開始的I/O定義改成你想用的I/O口；12M晶振若用89C51則只可裝下約14首歌曲，用89C52則可裝下近40曲
標簽： 單片機 最小系統(tǒng)
上傳時間： 2015-03-14
上傳用戶：qiao8960
這里是我在學(xué)校時所寫的一些程序，其中有些Java程序可能要重新編譯一下才能運行，具體如下：C Course Disign——C語言編寫的時鐘程序Very Simple CPU——CPU仿真工具StudentQuery——基于SQL語言數(shù)據(jù)庫的學(xué)籍管理系統(tǒng)Theory of Computation——一些關(guān)于計算理論算法的實現(xiàn)，詳見內(nèi)附說明Hotel——酒店管理系統(tǒng)另外還有一些硬件VHDL方面的程序，整理好后會陸續(xù)上傳
上傳時間： 2013-12-26
上傳用戶：onewq
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