The introduction of Spartan-3™ devices has createdmultiple changes in the evolution of embedded controldesigns and pushed processing capabilities to the “almostfreestage.” With these new FPGAs falling under $20, involume, with over 1 million system gates, and under $5for 100K gate-level units, any design with programmablelogic has a readily available 8- or 16-Bit processor costingless than 75 cents and 32-Bit processor for less than $1.50.
上傳時間: 2013-12-10
上傳用戶:zgu489
The Virtex™-4 user access register (USR_ACCESS_VIRTEX4) is a 32-Bit register thatprovides direct access to Bitstream data by the FPGA fabric. It is useful for loadingPowerPC™ 405 (PPC405) processor caches and/or other data into the FPGA after the FPGAhas been configured, thus achieving partial reconfiguration. The USR_ACCESS_VIRTEX4register is programmed through the Bitstream with a command that writes a series of 32-Bitwords.
標簽: USR_ACCESS PowerPC XAPP 719
上傳時間: 2013-11-13
上傳用戶:我累個乖乖
WP409利用Xilinx FPGA打造出高端比特精度和周期精度浮點DSP算法實現方案: High-Level Implementation of Bit- and Cycle-Accurate Floating-Point DSP Algorithms with Xilinx FPGAs
上傳時間: 2013-11-07
上傳用戶:defghi010
SRAM-based FPGAs are non-volatile devices. Upon powerup, They are required to be programmed from an external source. This procedure allows anyone to easily monitor the Bit-stream, and clone the device. The problem then becomes how can you effectively protect your intellectual property from others in an architecture where the part is externally programmed?
上傳時間: 2013-11-06
上傳用戶:wl9454
各種功能的計數器實例(VHDL源代碼):ENTITY counters IS PORT ( d : IN INTEGER RANGE 0 TO 255; clk : IN Bit; clear : IN Bit; ld : IN Bit; enable : IN Bit; up_down : IN Bit; qa : OUT INTEGER RANGE 0 TO 255; qb : OUT INTEGER RANGE 0 TO 255; qc : OUT INTEGER RANGE 0 TO 255; qd : OUT INTEGER RANGE 0 TO 255; qe : OUT INTEGER RANGE 0 TO 255; qf : OUT INTEGER RANGE 0 TO 255; qg : OUT INTEGER RANGE 0 TO 255; qh : OUT INTEGER RANGE 0 TO 255; qi : OUT INTEGER RANGE 0 TO 255;
上傳時間: 2014-11-30
上傳用戶:半熟1994
特點 最高輸入頻率 10KHz 計數速度 50/10000脈波/秒可選擇 四種輸入模式可選擇(加算,減算,加減算,90度相位差加減算) 90度相位差加減算具有提高解析度4倍功能 輸入脈波具有預設刻度功能 計數暫時停止功能 3組報警功能 15Bit類比輸出功能 數位RS-485界面 2:主要規格 脈波輸入型式: Jump-pin selectable current sourcing(NPN) or current sinking (PNP) 脈波觸發電位: HI bias (CMOS) (VIH=7.5V, VIL=5.5V) LO bias (TTL) (VIH=3.7V, VIL=2.0V) 最高輸入頻率: <10KHz (up,down,up/down mode) <3KHz (quadrature mode) 輸出動作時間 : 0.1 to 99.9 second adjustable 輸出復歸方式: Manual(N) or automatic (R or C) can be modif 繼電器容量: AC 250V-5A, DC 30V-7A 顯示值范圍: -199999 to 999999 類比輸出解析度: 15 Bit DAC 輸出反應速度: < 1/f+10ms(0-90%) 輸出負載能力: < 10mA for voltage mode < 10V for current mode <[(V+)-7.5V]/20mA for two-wire mode 輸出之漣波: < 0.1% F.S. 通訊位址: "01"-"FF" 傳輸速度: 19200/9600/4800/2400 selective 通信協議: Modbus RTU mode 顯示幕: Red high efficiency LEDs high 14.22mm (.56") 參數設定方式: Touch switches 感應器電源: 12VDC +/-3%(<60mA) 記憶方式: Non-volatile E2PROM memory 絕緣耐壓能力: 2KVac/1 min. (input/output/power) 1600Vdc (input/output) 使用環境條件: 0-50℃(20 to 90% RH non-condensed) 存放環境條件: 0-70℃(20 to 90% RH non-condensed) CE認證: EN 55022:1998/A1:2000 Class A EN 61000-3-2:2000 EN 61000-3-3:1995/A1:2001 EN 55024:1998/A1:2001
上傳時間: 2013-11-23
上傳用戶:redmoons
特點 精確度0.1%滿刻度 可輸入交直流電流/交直流電壓/電位計/傳送器...等信號 16 Bit類比輸出功能 輸入與輸出絕緣耐壓2仟伏特/1分鐘 寬范圍交直流兩用電源設計 尺寸小,穩定性高 2主要規格 精確度: 0.1% F.S. (23 ±5℃) 顯示值范圍: 0-±19999 digit adjustable 類比輸出解析度: 16 Bit DAC 輸出反應速度: < 250 ms (0-90%)(>10Hz) 輸出負載能力: < 10mA for voltage mode < 10V for current mode 輸出之漣波: < 0.1% F.S. 歸零調整范圍: 0- ±9999 Digit adjustable 最大值調整范圍: 0- ±9999 Digit adjustable 溫度系數: 50ppm/℃ (0-50℃) 顯示幕: Red high efficiency LEDs high 10.16mm (0.4") 隔離特性: Input/Output/Power/Case 參數設定方式: Touch switches 記憶方式: Non-volatile E2PROM memory 絕緣抗阻: >100Mohm with 500V DC 絕緣耐壓能力: 2KVac/1 min. (input/output/power) 1600Vdc (input/output) 使用環境條件: 0-60℃(20 to 90% RH non-condensed) 存放環境條件: 0-70℃(20 to 90% RH non-condensed) 安裝方式: Socket/plugin type with barrier terminals CE認證: EN 55022:1998/A1:2000 Class A EN 61000-3-2:2000 EN 61000-3-3:1995/A1:2001 EN 55024:1998/A1:2001
上傳時間: 2014-01-05
上傳用戶:eastgan
在對低噪聲CMOS圖像傳感器的研究中,除需關注其噪聲外,目前數字化也是它的一個重要的研究和設計方向,設計了一種可用于低噪聲CMOS圖像傳感器的12 Bit,10 Msps的流水線型ADC,并基于0.5 ?滋m標準CMOS工藝進行了流片。最后,通過在PCB測試版上用本文設計的ADC實現了模擬輸出的低噪聲CMOS圖像傳感器的模數轉換,并基于自主開發的成像測試系統進行了成像驗證,結果表明,成像畫面清晰,該ADC可作為低噪聲CMOS圖像傳感器的芯片級模數轉換器應用。
上傳時間: 2013-11-19
上傳用戶:xz85592677
基于ARM11的嵌入式視頻處理終端設計 在研究了基于ARMl 1體系結構的Samsung$3C6410處理器的基 礎上,給出了多格式視頻編解碼的使用方法和Windows CE下中斷流 驅動的設計方法,為Windows CE操作系統下的圖像采集和視頻處理 的復雜控制提供了軟件實現的方法;并以該處理器為核心,加上外部 存儲器和USB攝像頭等接口電路,完成了一個嵌入式視頻處理終端 核心板的硬件原理圖設計和PCB圖的設計,并對視頻處理終端的印 制電路板的電磁兼容進行了研究。 首先對嵌入式系統和視頻處理進行了簡單的介紹,指出了采用 $3C6410處理器設計的視頻處理終端具有的優勢。其次,對$3C6410 多格式視頻編解碼的使用進行了仔細分析,為多格式視頻編解碼軟件 的編寫提供了思路。給出了Windows CE下中斷流驅動程序的設計方 法,為主處理器和Bit處理器在Windows CE下中斷流驅動的設計提 供了一種較為通用的參考模型。第三,在熟悉了S3C64lO處理器的 體系結構基礎上設計出了下列電路原理圖:電源及復位電路,時鐘電 路,DDR SDRAM和FLASH存儲器電路,USB接口電路,串口電路, JTAG接口電路,LCD和TSP接口電路。整個嵌入式視頻處理終端是 一個可以獨立工作的可擴展系統,該系統主要用于圖像采集和視頻編 解碼功能。另外,分別從濾波和接地等電磁兼容性設計手段出發,對 這些方法進行了理論分析,提出了提高視頻處理終端電磁兼容的措 施。最后,通過編寫簡單的應用程序,視頻處理終端對圖像進行H.264 編碼,可以通過無線網卡進行傳輸編碼后的圖像。測試結果表明,視 頻處理終端能夠實現視頻圖像的拍攝、壓縮、無線視頻傳送和視頻監 控等功能。
上傳時間: 2013-11-22
上傳用戶:誰偷了我的麥兜
The NCV7356 is a physical layer device for a single wire data linkcapable of operating with various Carrier Sense Multiple Accesswith Collision Resolution (CSMA/CR) protocols such as the BoschController Area Network (CAN) version 2.0. This serial data linknetwork is intended for use in applications where high data rate is notrequired and a lower data rate can achieve cost reductions in both thephysical media components and in the microprocessor and/ordedicated logic devices which use the network.The network shall be able to operate in either the normal data ratemode or a high-speed data download mode for assembly line andservice data transfer operations. The high-speed mode is onlyintended to be operational when the bus is attached to an off-boardservice node. This node shall provide temporary bus electrical loadswhich facilitate higher speed operation. Such temporary loads shouldbe removed when not performing download operations.The Bit rate for normal communications is typically 33 kBit/s, forhigh-speed transmissions like described above a typical Bit rate of83 kBit/s is recommended. The NCV7356 features undervoltagelockout, timeout for faulty blocked input signals, output blankingtime in case of bus ringing and a very low sleep mode current.
上傳時間: 2013-10-24
上傳用戶:s藍莓汁