JTAG(Joint Test Action Group;聯(lián)合測試行動小組)是一種國際標(biāo)準(zhǔn)測試協(xié)議（IEEE 1149.1兼容），主要用于芯片內(nèi)部測試。
上傳時間： 2013-04-24
上傳用戶：amwfhv
什么是JTAG 到底什么是JTAG呢？ JTAG(Joint Test Action Group)聯(lián)合測試行動小組)是一種國際標(biāo)準(zhǔn)測試協(xié)議（IEEE 1149.1兼容），主要用于芯片內(nèi)部測試。現(xiàn)在多數(shù)的高級器件都支持JTAG協(xié)議，如DSP、FPGA器件等。標(biāo)準(zhǔn)的JTAG接口是4線：TMS、 TCK、TDI、TDO，分別為模式選擇、時鐘、數(shù)據(jù)輸入和數(shù)據(jù)輸出線。 JTAG最初是用來對芯片進行測試的，基本原理是在器件內(nèi)部定義一個TAP（Test Access Port�測試訪問口）通過專用的JTAG測試工具對進行內(nèi)部節(jié)點進行測試。JTAG測試允許多個器件通過JTAG接口串聯(lián)在一起，形成一個JTAG鏈，能實現(xiàn)對各個器件分別測試。現(xiàn)在，JTAG接口還常用于實現(xiàn)ISP（In-System rogrammable�在線編程），對FLASH等器件進行編程。 JTAG編程方式是在線編程，傳統(tǒng)生產(chǎn)流程中先對芯片進行預(yù)編程現(xiàn)再裝到板上因此而改變，簡化的流程為先固定器件到電路板上，再用JTAG編程，從而大大加快工程進度。JTAG接口可對PSD芯片內(nèi)部的所有部件進行編程 JTAG的一些說明 通常所說的JTAG大致分兩類，一類用于測試芯片的電氣特性，檢測芯片是否有問題；一類用于Debug；一般支持JTAG的CPU內(nèi)都包含了這兩個模塊。 一個含有JTAG Debug接口模塊的CPU，只要時鐘正常，就可以通過JTAG接口訪問CPU的內(nèi)部寄存器和掛在CPU總線上的設(shè)備，如FLASH，RAM，SOC（比如4510B，44Box，AT91M系列）內(nèi)置模塊的寄存器，象UART，Timers，GPIO等等的寄存器。 上面說的只是JTAG接口所具備的能力，要使用這些功能，還需要軟件的配合，具體實現(xiàn)的功能則由具體的軟件決定。 例如下載程序到RAM功能。了解SOC的都知道，要使用外接的RAM，需要參照SOC DataSheet的寄存器說明，設(shè)置RAM的基地址，總線寬度，訪問速度等等。有的SOC則還需要Remap，才能正常工作。運行Firmware時，這些設(shè)置由Firmware的初始化程序完成。但如果使用JTAG接口，相關(guān)的寄存器可能還處在上電值，甚至?xí)r錯誤值，RAM不能正常工作，所以下載必然要失敗。要正常使用，先要想辦法設(shè)置RAM。在ADW中，可以在Console窗口通過Let 命令設(shè)置，在AXD中可以在Console窗口通過Set命令設(shè)置。
上傳時間： 2013-10-23
上傳用戶：aeiouetla
LAME無疑是目前最優(yōu)秀的MP3編碼軟件，與傳統(tǒng)的MP3編碼器相比，它能夠更好地利用人耳遮蔽效應(yīng)，并且支持VBR（可變碼率）以及Joint stero（聯(lián)合立體聲）技術(shù)，從而在一定的壓縮比達(dá)到了更好的聽音效果。所以，使用LAME編碼的MP3具有細(xì)節(jié)豐富、高頻失真小的優(yōu)點。這是最新發(fā)布的4.0 Alpha版本，編碼速度有了非常大的改善，但是音質(zhì)效果卻并沒有提高的跡象。推薦使用VBR-0方式編碼。 HTTP：//WWW.PSPHOME.NET 里面有個：工具軟件 文件名是：Lame392和RozarLame115
上傳時間： 2013-12-19
上傳用戶：zhengjian
DIGITAL IMAGERY is pervasive in our world today. Consequently, standards for the efficient representation and interchange of digital images are essential. To date, some of the most successful still image compression standards have resulted from the ongoing work of the Joint Photographic Experts Group (JPEG). This group operates under the auspices of Joint Technical Committee 1, Subcommittee 29, Working Group 1 (JTC 1/SC 29/WG 1), a collaborative effort between the International Organization for Standardization (ISO) and International Telecommunication Union Standardization Sector (ITUT). Both the JPEG [1–3] and JPEG-LS [4–6] standards were born from the work of the JPEG committee. For the last few years, the JPEG committee has been working towards the establishment of a new standard known as JPEG 2000 (i.e., ISO/IEC 15444). The fruits of these labors are now coming to bear, as JPEG-2000 Part 1 (i.e., ISO/IEC 15444-1 [7]) has recently been approved as a new international standard.
標(biāo)簽： Consequently efficient pervasive standards
上傳時間： 2013-12-21
上傳用戶：源弋弋
This demo nstrates the use of the reversible jump MCMC simulated annealing for neural networks. This algorithm enables us to maximise the Joint posterior distribution of the network parameters and the number of basis function. It performs a global search in the Joint space of the parameters and number of parameters, thereby surmounting the problem of local minima. It allows the user to choose among various model selection criteria, including AIC, BIC and MDL
標(biāo)簽： This reversible annealing the
上傳時間： 2015-07-19
上傳用戶：ma1301115706
UWB 功率控制 容量 Main Matlab script is in runsim.m. It generates random topologies, optimizes, and display results. IMPORTANT: you may need to add manually the lib path in Matlab in order to get all the necessary functions. Reference: Radunovic, Le Boudec, "Joint Power Control, Scheduling and Routing in UWB networks"
標(biāo)簽： topologies generates optimizes Matlab
上傳時間： 2015-08-14
上傳用戶：shanml
A new cable fault location method based on wavelet reconstruction is proposed. In this method the difference between the currents of faulty phase and sound phase under the high voltage pulse excitation is used as the measured signal and is decomposed in multi-scale by wavelet transform, then reconstructed in single scale. Comparing with traditional fault location method by travelling wave, the presented method will not be interfered by the reflected wave from the branch Joint of cables or from other positions where the impedances are not matched and not be influenced by fault types, otherwise, the reflected waves can be recognized even the faulty position is near to the measuring terminal, at the same time, the influence of the wave speed uncertainty can be reduced. The correctness of the proposed method is proved by simulation results.
標(biāo)簽： method reconstruction location proposed
上傳時間： 2016-02-04
上傳用戶：maizezhen
OPEN-JTAG ARM JTAG 測試原理 1 前言 本篇報告主要介紹ARM JTAG測試的基本原理。基本的內(nèi)容包括了TAP (TEST ACCESS PORT) 和BOUNDARY-SCAN ARCHITECTURE的介紹，在此基礎(chǔ)上，結(jié)合ARM7TDMI詳細(xì)介紹了的JTAG測試原理。 2 IEEE Standard 1149.1 - Test Access Port and Boundary-Scan Architecture 從IEEE的JTAG測試標(biāo)準(zhǔn)開始，JTAG是Joint TEST ACTION GROUP的簡稱。IEEE 1149.1標(biāo)準(zhǔn)最初是由JTAG這個組織提出，最終由IEEE批準(zhǔn)並且標(biāo)準(zhǔn)化，所以，IEEE 1149.1這個標(biāo)準(zhǔn)一般也俗稱JTAG測試標(biāo)準(zhǔn)。 接下來介紹TAP (TEST ACCESS PORT) 和BOUNDARY-SCAN ARCHITECTURE的基本架構(gòu)。
標(biāo)簽： JTAG BOUNDARY-SCAN OPEN-JTAG ARM
上傳時間： 2016-08-16
上傳用戶：sssl
this directory contains the following: * The acdc algorithm for finding the approximate general (non-orthogonal) Joint diagonalizer (in the direct Least Squares sense) of a set of Hermitian matrices. [acdc.m] * The acdc algorithm for finding the same for a set of Symmetric matrices. [acdc_sym.m](note that for real-valued matrices the Hermitian and Symmetric cases are similar however, in such cases the Hermitian version [acdc.m], rather than the Symmetric version[acdc_sym] is preferable. * A function that finds an initial guess for acdc by applying hard-whitening followed by Cardoso s orthogonal Joint diagonalizer. Note that acdc may also be called without an initial guess, in which case the initial guess is set by default to the identity matrix. The m-file includes the Joint_diag function (by Cardoso) for performing the orthogonal part. [init4acdc.m]
標(biāo)簽： approximate directory algorithm the
上傳時間： 2014-01-17
上傳用戶：hanli8870
The existence of numerous imaging modalities makes it possible to present different data present in different modalities together thus forming multimodal images. Component images forming multimodal images should be aligned, or registered so that all the data, coming from the different modalities, are displayed in proper locations. The term image registration is most commonly used to denote the process of alignment of images , that is of transforming them to the common coordinate system. This is done by optimizing a similarity measure between the two images. A widely used measure is Mutual Information (MI). This method requires estimating Joint histogram of the two images. Experiments are presented that demonstrate the approach. The technique is intensity-based rather than feature-based. As a comparative assessment the performance based on normalized mutual information and cross correlation as metric have also been presented.
標(biāo)簽： present modalities existence different
上傳時間： 2017-04-03
上傳用戶：qunquan
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