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        Vision 400 Network Packet Broker
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    • W2351EP DDR4 一致性测试台 [已淘汰]

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    用于 DDR4 一致性测试的仿真测量关联和工作流程

    • 观看短视频:与 Infiniium 离线分析软件连接的 DDR4 一致性测试台

    注意:ADS 一致性测试台作为软件插件添加到 ADS 2015.01 或更新版本。如欲了解下载、最低系统要求和安装的详细信息,请访问:https://www.keysight.com/find/eesof-ads-ctb-downloads

    W2351EP DDR4 一致性测试台可以帮助用户解决仿真与测量关联问题。过去,设计在进入制造阶段之前,可以通过 EDA 厂商的一致性测试工具进行仿真和测试,制造出来的原型可以通过测试与测量仪器厂商提供的一致性测试工具在工作台上进行测试。但不管使用哪家厂商的测试工具,这两种方法都会存在细微差别,因此很难将仿真结果与硬件原型测试结果关联起来。这可能会导致设计在制造前合格,但制造出的原型却不合格,为此工程师不得不花费大量时间进行重复设计,使得成本高企。相比之下,Keysight Infiniium 示波器采用了完全相同且先进的一致性测试软件,而 DDR4 一致性测试台充分利用了这一优势。当您在实验室中执行测试时,它能够仿真真实的硬件测试台,通过“波形桥”脚本技术输出与 Infiniium 应用软件捕获结果相同的波形。所以,工程师能够对制造前的仿真设计和制造后的实际原型执行同样的一致性测试。

    该产品自身包括两部分:仿真测试台和波形桥脚本。

    仿真测试台

    仿真测试台由多个子电路组成,即 DDR 控制器、通道和 DDR 内存芯片。仿真测试台必须装有 ADS 瞬态仿真器,电路在该仿真器下运行。通用芯片 I/O 由传统的 IBIS 模型表示,但是您可以用更专业化的 IBIS 或网表模型来取代这些模型之一或同时取代两者。同样,通用通道模型级联(包括控制器封装、主板、DIMM 连接器、DIMM PCB 和内存封装)的任意部分或所有部分都可以由版图前期或后期模型替代。例如,您可以使用电磁(EM)场求解程序对版图后期主板上的一个字节通道创建 S 参数模型。

    波形桥脚本

    一旦使用仿真测试台仿真您的制造前设计,瞬态仿真功能就会将适当的波形写入数据集并开始运行。波形桥脚本是一个后期处理步骤,它从数据集中取得波形并将其写入文件。Infiniium 一致性测试应用软件可以处理这个文件。

    与 N6462A DDR4 一致性测试应用软件配合使用

    波形桥脚本编写的文件可以输入到用于 Infiniium 9000 和 90000 系列示波器的 N6462A DDR4 一致性测试应用软件。此应用软件现在提供了离线/远程模式,因而不仅能够处理示波器提供的实时数据,还能使用已存储的(“离线”)数据。此外,您现在可以在“远程”模式下运行此应用程序,这意味着它除了在示波器的嵌入式 PC 中运行之外,还能在任意 Windows PC(包括运行先进设计系统(ADS)的 PC)上运行。通过这种方式,您可以确保在制造前的设计仿真阶段和后面的原型制造阶段运行完全一致的仿真。

    典型配置

    • W2210BP/BT ADS 内核 + 瞬态卷积
    • W2351EP/ET ADS DDR4 一致性测试台
    • N8900A-001 Infiniium 离线
    • N8900A-002 DSA 套件(EZJIT Plus 和 SDA)
    • N6462A-1TP DDR4 一致性测试软件,可转移许可证
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