搜索：memory - 虫虫下载站

可编程逻辑  XAPP806 -决定DDR反馈时钟的最佳DCM相移

This application note describes how to build a system that can be used for determining theoptimal phase shift for a Double Data Rate (DDR) memory feedback clock. In this system, theDDR memory is controlled by a controller that attaches to either the OPB or PLB and is used inan embedded microproces ...

https://www.eeworm.com/dl/kbcluoji/40078.html

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可编程逻辑  XAPP708 -133MHz PCI-X到128MB DDR小型DIMM存储器桥

&nbsp; The Virtex-4 features, such as the programmable IDELAY and built-in FIFO support, simplifythe bridging of a high-speed, PCI-X core to large amounts of DDR-SDRAM memory. Onechallenge is meeting the PCI-X target initial latency specification. PCI-X Protocol Addendum tothe PCI Local Bus Spec ...

https://www.eeworm.com/dl/kbcluoji/40099.html

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可编程逻辑  XAPP740利用AXI互联设计高性能视频系统

This application note covers the design considerations of a system using the performance features of the LogiCORE&trade; IP Advanced eXtensible Interface (AXI) Interconnect core. The design focuses on high system throughput through the AXI Interconnect core with F MAX &nbsp;and area optimizat ...

https://www.eeworm.com/dl/kbcluoji/40103.html

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可编程逻辑  HyperLynx仿真软件在主板设计中的应用

信号完整性问题是高速PCB 设计者必需面对的问题。阻抗匹配、合理端接、正确拓扑结构解决信号完整性问题的关键。传输线上信号的传输速度是有限的，信号线的布线长度产生的信号传输延时会对信号的时序关系产生影响，所以PCB 上的高速信号的长度以及延时要仔细计算和分析。运用信号完整性分析工具进行布线前后的仿真对于保证信 ...

https://www.eeworm.com/dl/kbcluoji/40435.html

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可编程逻辑  Hyperlynx仿真应用:阻抗匹配

Hyperlynx仿真应用:阻抗匹配.下面以一个电路设计为例，简单介绍一下PCB仿真软件在设计中的使用。下面是一个DSP硬件电路部分元件位置关系(原理图和PCB使用PROTEL99SE设计)，其中DRAM作为DSP的扩展Memory(64位宽度，低8bit还经过3245接到FLASH和其它芯片)，DRAM时钟频率133M。因为频率较高，设计过程中我们需要考虑DRAM的数据 ...

https://www.eeworm.com/dl/kbcluoji/40436.html

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测试测量  微电脑型RS-485显示电表（2448mm/4896mm）

微电脑型RS-485显示电表（24*48mm/48*96mm）特点： 5位数RS-485显示电表显示范围-19999-99999位數通訊协议Modbus RTU模式宽范围交直流兩用電源設計尺寸小,穩定性高主要规格：显示范围:-19999~99999 digit RS-485传输速度: 19200/9600/4800/2400 selective RS-485通讯位址: "01"-"FF" RS-485通讯协议: Modbus RTU mod ...

https://www.eeworm.com/dl/544/41698.html

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测试测量  微电脑型单相交流集合式电表（单相二线系统）

微电脑型单相交流集合式电表（单相二线系统）特点：精确度0.25%满刻度&plusmn;1位数可同时量测与显示交流电压,電流,頻率,瓦特,(功率因數/視在功率) 交流電壓,電流,瓦特皆為真正有效值(TRMS) 交流電流,瓦特之小數點可任意設定瓦特單位W或KW可任意設定 CT比可任意設定(1至999) 輸入與輸出絕緣耐压 2仟伏特/1分鐘( 突波測 ...

https://www.eeworm.com/dl/544/41700.html

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测试测量  集合式直流电能表（小功率的）

集合式直流电能表（小功率的）特点：精确度0.05%满刻度&plusmn;1位数可同时量测与显示/直流电压/电流/瓦特（千瓦）/瓦特小时（千瓦小时）电压输入（DC0-99.99V/0-600.0V）自动变档功能显示范围0-9999(电流/瓦特/千瓦),0至99999999(八位數瓦特小时)可任意规划数位RS-485 界面 (Optional) 主要规格：辅助电源消耗功率 ...

https://www.eeworm.com/dl/544/41701.html

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测试测量  确定任务参数的温度记录仪

Logger iButton devices have gained a lot of popularity with researchers. Although free evaluation software is easy to use and welldocumented, the choices and inputs that need to be made can sometimes be challenging. This application note explains technicalterms that are common with temperature log ...

https://www.eeworm.com/dl/544/41804.html

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测试测量  如何测试稳压器的负载瞬态响应

&nbsp; Semiconductor memory, card readers, microprocessors,disc drives, piezoelectric devices and digitally based systemsfurnish transient loads that a voltage regulator mustservice. Ideally, regulator output is invariant during a loadtransient. In practice, some variation is encountered andbeco ...

https://www.eeworm.com/dl/544/41897.html

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