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.
上传时间: 2013-12-10
上传用户: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.
标签: USR_ACCESS PowerPC XAPP 719
上传时间: 2013-11-13
上传用户:我累个乖乖
WP409利用Xilinx FPGA打造出高端比特精度和周期精度浮点DSP算法实现方案: High-Level Implementation of BIt- and Cycle-Accurate Floating-Point DSP Algorithms with Xilinx FPGAs
上传时间: 2013-11-07
上传用户: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?
上传时间: 2013-11-06
上传用户:wl9454
各种功能的计数器实例(VHDL源代码):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;
上传时间: 2014-11-30
上传用户:半熟1994
特点 最高輸入頻率 10KHz 计数速度 50/10000脈波/秒可选择 四种输入模式可选择(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 输入脈波具有预设刻度功能 计数暂时停止功能 3组报警功能 15BIt类比输出功能 数位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) 脉波触发电位: HI bias (CMOS) (VIH=7.5V, VIL=5.5V) LO bias (TTL) (VIH=3.7V, VIL=2.0V) 最高输入频率: <10KHz (up,down,up/down mode) <3KHz (quadrature mode) 输出动作时间 : 0.1 to 99.9 second adjustable 输出复归方式: Manual(N) or automatic (R or C) can be modif 继电器容量: AC 250V-5A, DC 30V-7A 显示值范围: -199999 to 999999 类比输出解析度: 15 BIt DAC 输出反应速度: < 1/f+10ms(0-90%) 输出负载能力: < 10mA for voltage mode < 10V for current mode <[(V+)-7.5V]/20mA for two-wire mode 输出之涟波: < 0.1% F.S. 通讯位址: "01"-"FF" 传输速度: 19200/9600/4800/2400 selective 通信协议: Modbus RTU mode 显示幕: Red high efficiency LEDs high 14.22mm (.56") 参数设定方式: Touch switches 感应器电源: 12VDC +/-3%(<60mA) 记忆方式: Non-volatile E2PROM memory 绝缘耐压能力: 2KVac/1 min. (input/output/power) 1600Vdc (input/output) 使用环境条件: 0-50℃(20 to 90% RH non-condensed) 存放环境条件: 0-70℃(20 to 90% RH non-condensed) CE认证: EN 55022:1998/A1:2000 Class A EN 61000-3-2:2000 EN 61000-3-3:1995/A1:2001 EN 55024:1998/A1:2001
上传时间: 2013-11-23
上传用户:redmoons
特点 精确度0.1%滿刻度 可輸入交直流電流/交直流电压/電位計/傳送器...等信号 16 BIt类比输出功能 输入与输出绝缘耐压2仟伏特/1分钟 宽范围交直流兩用電源设计 尺寸小,穩定性高 2主要規格 精确度: 0.1% F.S. (23 ±5℃) 显示值范围: 0-±19999 digit adjustable 类比输出解析度: 16 BIt DAC 输出反应速度: < 250 ms (0-90%)(>10Hz) 输出负载能力: < 10mA for voltage mode < 10V for current mode 输出之涟波: < 0.1% F.S. 归零调整范围: 0- ±9999 Digit adjustable 最大值调整范围: 0- ±9999 Digit adjustable 温度系数: 50ppm/℃ (0-50℃) 显示幕: Red high efficiency LEDs high 10.16mm (0.4") 隔离特性: Input/Output/Power/Case 参数设定方式: Touch switches 记忆方式: Non-volatile E2PROM memory 绝缘抗阻: >100Mohm with 500V DC 绝缘耐压能力: 2KVac/1 min. (input/output/power) 1600Vdc (input/output) 使用环境条件: 0-60℃(20 to 90% RH non-condensed) 存放环境条件: 0-70℃(20 to 90% RH non-condensed) 安装方式: Socket/plugin type with barrier terminals CE认证: EN 55022:1998/A1:2000 Class A EN 61000-3-2:2000 EN 61000-3-3:1995/A1:2001 EN 55024:1998/A1:2001
上传时间: 2014-01-05
上传用户:eastgan
在对低噪声CMOS图像传感器的研究中,除需关注其噪声外,目前数字化也是它的一个重要的研究和设计方向,设计了一种可用于低噪声CMOS图像传感器的12 BIt,10 Msps的流水线型ADC,并基于0.5 ?滋m标准CMOS工艺进行了流片。最后,通过在PCB测试版上用本文设计的ADC实现了模拟输出的低噪声CMOS图像传感器的模数转换,并基于自主开发的成像测试系统进行了成像验证,结果表明,成像画面清晰,该ADC可作为低噪声CMOS图像传感器的芯片级模数转换器应用。
上传时间: 2013-11-19
上传用户:xz85592677
基于ARM11的嵌入式视频处理终端设计 在研究了基于ARMl 1体系结构的Samsung$3C6410处理器的基 础上,给出了多格式视频编解码的使用方法和Windows CE下中断流 驱动的设计方法,为Windows CE操作系统下的图像采集和视频处理 的复杂控制提供了软件实现的方法;并以该处理器为核心,加上外部 存储器和USB摄像头等接口电路,完成了一个嵌入式视频处理终端 核心板的硬件原理图设计和PCB图的设计,并对视频处理终端的印 制电路板的电磁兼容进行了研究。 首先对嵌入式系统和视频处理进行了简单的介绍,指出了采用 $3C6410处理器设计的视频处理终端具有的优势。其次,对$3C6410 多格式视频编解码的使用进行了仔细分析,为多格式视频编解码软件 的编写提供了思路。给出了Windows CE下中断流驱动程序的设计方 法,为主处理器和BIt处理器在Windows CE下中断流驱动的设计提 供了一种较为通用的参考模型。第三,在熟悉了S3C64lO处理器的 体系结构基础上设计出了下列电路原理图:电源及复位电路,时钟电 路,DDR SDRAM和FLASH存储器电路,USB接口电路,串口电路, JTAG接口电路,LCD和TSP接口电路。整个嵌入式视频处理终端是 一个可以独立工作的可扩展系统,该系统主要用于图像采集和视频编 解码功能。另外,分别从滤波和接地等电磁兼容性设计手段出发,对 这些方法进行了理论分析,提出了提高视频处理终端电磁兼容的措 施。最后,通过编写简单的应用程序,视频处理终端对图像进行H.264 编码,可以通过无线网卡进行传输编码后的图像。测试结果表明,视 频处理终端能够实现视频图像的拍摄、压缩、无线视频传送和视频监 控等功能。
上传时间: 2013-11-22
上传用户:谁偷了我的麦兜
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.
上传时间: 2013-10-24
上传用户:s蓝莓汁