什么是JTAG 到底什么是JTAG呢? JTAG(Joint Test Action Group)聯合測試行動小組)是一種國際標準測試協議(IEEE 1149.1兼容),主要用于芯片內部測試。現在多數的高級器件都支持JTAG協議,如DSP、FPGA器件等。標準的JTAG接口是4線:TMS、 TCK、TDI、TDO,分別為模式選擇、時鐘、數據輸入和數據輸出線。 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測試工具對進行內部節點進行測試。JTAG測試允許多個器件通過JTAG接口串聯在一起,形成一個JTAG鏈,能實現對各個器件分別測試。現在,JTAG接口還常用于實現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,傳統生產流程中先對芯片進行預編程現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的內部寄存器和掛在CPU總線上的設備,如FLASH,RAM,SOC(比如4510B,44Box,AT91M系列)內置模塊的寄存器,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,這些設置由Firmware的初始化程序完成。但如果使用JTAG接口,相關的寄存器可能還處在上電值,甚至時錯誤值,RAM不能正常工作,所以下載必然要失敗。要正常使用,先要想辦法設置RAM。在ADW中,可以在Console窗口通過Let 命令設置,在AXD中可以在Console窗口通過Set命令設置。
上傳時間: 2013-10-23
上傳用戶:aeiouetla
This application note explains the XC9500™/XL/XV Boundary Scan interface anddemonstrates the software available for programming and testing XC9500/XL/XV CPLDs. Anappendix summarizes the iMPACT software operations and provides an overview of theadditional operations supported by XC9500/XL/XV CPLDs for in-system programming.
上傳時間: 2013-11-15
上傳用戶:fengweihao158@163.com
This application note contains a reference design consisting of HDL IP and Xilinx AdvancedConfiguration Environment (ACE) software utilities that give designers great flexibility increating in-system programming (ISP) solutions. In-system programming support allowsdesigners to revise existing designs, package the new bitstream programming files with theprovided software utilities, and update the remote system through the JTAG interface using theEmbedded JTAG ACE Player.
上傳時間: 2013-11-14
上傳用戶:JIMMYCB001
Prakash Rashinkar has over 15 years experience in system design and verificationof embedded systems for communication satellites, launch vehicles and spacecraftground systems, high-performance computing, switching, multimedia, and wirelessapplications. Prakash graduated with an MSEE from Regional Engineering College,Warangal, in India. He lead the team that was responsible for delivering themethodologies for SOC verification at Cadence Design Systems. Prakash is anactive member of the VSIA Functional Verification DWG. He is currently Architectin the Vertical Markets and Design Environments Group at Cadence.
上傳時間: 2014-01-24
上傳用戶:xinhaoshan2016
摘要: 串行傳輸技術具有更高的傳輸速率和更低的設計成本, 已成為業界首選, 被廣泛應用于高速通信領域。提出了一種新的高速串行傳輸接口的設計方案, 改進了Aurora 協議數據幀格式定義的弊端, 并采用高速串行收發器Rocket I/O, 實現數據率為2.5 Gbps的高速串行傳輸。關鍵詞: 高速串行傳輸; Rocket I/O; Aurora 協議 為促使FPGA 芯片與串行傳輸技術更好地結合以滿足市場需求, Xilinx 公司適時推出了內嵌高速串行收發器RocketI/O 的Virtex II Pro 系列FPGA 和可升級的小型鏈路層協議———Aurora 協議。Rocket I/O支持從622 Mbps 至3.125 Gbps的全雙工傳輸速率, 還具有8 B/10 B 編解碼、時鐘生成及恢復等功能, 可以理想地適用于芯片之間或背板的高速串行數據傳輸。Aurora 協議是為專有上層協議或行業標準的上層協議提供透明接口的第一款串行互連協議, 可用于高速線性通路之間的點到點串行數據傳輸, 同時其可擴展的帶寬, 為系統設計人員提供了所需要的靈活性[4]。但該協議幀格式的定義存在弊端,會導致系統資源的浪費。本文提出的設計方案可以改進Aurora 協議的固有缺陷,提高系統性能, 實現數據率為2.5 Gbps 的高速串行傳輸, 具有良好的可行性和廣闊的應用前景。
上傳時間: 2013-11-06
上傳用戶:smallfish
The LPC2292/2294 microcontrollers are based on a 16/32-bit ARM7TDMI-S CPU with real-time emulation and embedded trace support, together with 256 kB of embedded high-speed flash memory. A 128-bit wide memory interface and a unique accelerator architecture enable 32-bit code execution at the maximum clock rate. For critical code size applications, the alternative 16-bit Thumb mode reduces code by more than 30 pct with minimal performance penalty. With their 144-pin package, low power consumption, various 32-bit timers, 8-channel 10-bit ADC, 2/4 (LPC2294) advanced CAN channels, PWM channels and up to nine external interrupt pins these microcontrollers are particularly suitable for automotive and industrial control applications as well as medical systems and fault-tolerant maintenance buses. The number of available fast GPIOs ranges from 76 (with external memory) through 112 (single-chip). With a wide range of additional serial communications interfaces, they are also suited for communication gateways and protocol converters as well as many other general-purpose applications. Remark: Throughout the data sheet, the term LPC2292/2294 will apply to devices with and without the /00 or /01 suffix. The suffixes /00 and /01 will be used to differentiate from other devices only when necessary.
上傳時間: 2014-12-30
上傳用戶:aysyzxzm
Keil C51 V8 專業開發工具(PK51) PK51是為8051系列單片機所設計的開發工具,支持所有8051系列衍生產品,,支持帶擴展存儲器和擴展指令集(例如Dallas390/5240/400,Philips 51MX,Analog Devices MicroConverters)的新設備,以及支持很多公司的一流的設備和IP內核,比如Analog Devices, Atmel, Cypress Semiconductor, Dallas Semiconductor, Goal, Hynix, Infineon, Intel, NXP(founded by Philips), OKI, Silicon Labs,SMSC, STMicroeleectronics,Synopsis, TDK, Temic, Texas Instruments,Winbond等。 通過PK51專業級開發工具,可以輕松地了解8051的On-chip peripherals與及其它關鍵特性。 The PK51專業級開發工具包括… l μVision Ø 集成開發環境 Ø 調試器 Ø 軟件模擬器 l Keil 8051擴展編譯工具 Ø AX51宏匯編程序 Ø ANSI C編譯工具 Ø LX51 連接器 Ø OHX51 Object-HEX 轉換器 l Keil 8051編譯工具 Ø A51宏匯編程序 Ø C51 ANSI C編譯工具 Ø BL51 代碼庫連接器 Ø OHX51 Object-HEX 轉換器 Ø OC51 集合目標轉換器 l 目標調試器 Ø FlashMON51 目標監控器 Ø MON51目標監控器 Ø MON390 (Dallas 390)目標監控器 Ø MONADI (Analog Devices 812)目標監控器 Ø ISD51 在系統調試 l RTX51微實時內核 你應該考慮PK51開發工具包,如果你… l 需要用8051系列單片機來開發 l 需要開發 Dallas 390 或者 Philips 51MX代碼 l 需要用C編寫代碼 l 需要一個軟件模擬器或是沒有硬件仿真器 l 需要在單芯片上基于小實時內核創建復雜的應用
上傳時間: 2013-10-30
上傳用戶:yy_cn
On the LPC13xx, programming, erasure and re-programming of the on-chip flash can be performed using In-System Programming (ISP) via the UART serial port, and also, can be performed using In-Application Programming (IAP) calls directed by the end-user code. For In-System Programming (ISP) via the UART serial port, the ISP command handler (resides in the bootloader) allows erasure of one or more sector (s) of the on-chip flash memory.
上傳時間: 2013-12-13
上傳用戶:lmq0059
多維多選擇背包問題(MMKP)是0-1背包問題的延伸,背包核已經被用來設計解決背包問題的高效算法。目的是研究如何獲得一種背包核,并以此高效處理多維多選擇背包問題。首先給出了一種方法確定MMKP的核,然后闡述了利用核精確解決MMKP問題的B&B算法,列出了具體的算法步驟。在分析了算法的存儲復雜度后,將算法在各種實例上的運行效果與目前解決MMKP問題的常用算法的運行效果進行了比較,發現本文的算法性能優于以往任何算法。
上傳時間: 2013-11-20
上傳用戶:wangw7689
This application note contains a reference design consisting of HDL IP and Xilinx AdvancedConfiguration Environment (ACE) software utilities that give designers great flexibility increating in-system programming (ISP) solutions. In-system programming support allowsdesigners to revise existing designs, package the new bitstream programming files with theprovided software utilities, and update the remote system through the JTAG interface using theEmbedded JTAG ACE Player.
上傳時間: 2013-10-22
上傳用戶:gai928943