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标准组织为JEDEC，官网jedec.org，早期的标准文档个人注册后可免费下载，近期发布的需要付费

常用标准

DDR:

	*  DDR5:  JESD79-5.pdf
	*  DDR4:  JESD79-4C.pdf
	*  DDR3U:  JESD79-3-2.pdf
	*  DDR3L:  JESD79-3-1A-01.pdf
	*  DDR3:  JESD79-3F.pdf
	*  DDR2:  JESD79-2F.pdf
	*  DDR1:  JESD79F.pdf

LPDDR:

	*  LPDDR5/5X:</description>
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PCB叠层图如下PCB设计大全：使用OrCAD+Capture与PCB+Editor: CHAPTER 1 ：



板材

标准详见IPC-4101C Specification for Base Materials for Rigid and multilayer Printed Boards

常用PCB板材见博锐电路：PCB板材汇总表

由PCB叠层图可知，PCB由覆铜板（芯板Core）和半固化片（Prepreg，简称PP）压合而成。

覆铜板的制作如下图，其材料为树脂、增强材料以及导电铜箔$$
C_{\text{via}} \, [\mathrm{pF}] = \frac{1.41 \cdot \varepsilon_r \cdot T \cdot D_{\text{pad}}}{D_{\text{antipad}} - D_{\text{pad}}}
$$$$
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\hline
\textbf{符号} &amp; \textbf{物理意义} &amp; \textbf{单位} \\ 
\hline
C_{\text{via}} &amp; \te…</description>
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        <title>办公:start - [框图、流程图绘图工具] </title>
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        <description>办公

办公工具

浏览器插件

Linkclump：一次打开多个链接。

下载地址：chrome web store：Linkclump

使用说明：Linkclump:一次性打开多个链接

Notepad++

notepad++ 正则表达式（详见Perl Regular Expression Syntax）：

	*  “^”对应每行的开头
	*  “$”对应每行的结尾
	*  “.“对应单个字符</description>
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        <description>硬件WiKi网站致力于为硬件工程师提供准确、规范和完整的硬件文档，把网上大量零散资料收集、归纳和整理，尽量简化，作为一个工具书，方便硬件工程师查阅参考。 

包括元器件的介绍、选型，相关协议硬件部分的标准，测试规范等等。</description>
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操作

Cadence Allegro实现邻层挖空工具的使用

Allegro中导入&amp;导出DXF文件

Allegro中outline的处理

Cadence Allegro元件封装制作流程

吴川斌的博客：规范化操作 中兴使用Allegro来高效完成复杂服务器主板的案例

PCB设计之“如何使用Allegro建立Pad

使用Cadence绘制PCB流程

工具

电路精灵

配置

取消高亮自动放大:</description>
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布局

封装

	*  确认哪些元器件无PCB封装，提供资料（规格书、2D或3D结构图等）给EDA工程师新建封装。对于老封装，则需要提供对应的封装库给EDA工程师，并注意下有无用错库。</description>
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USB的标准组织为USB-IF，网站&lt;https://www.usb.org/&gt;，相关标准文档均可以从该网站（&lt;https://www.usb.org/documents&gt;）上下载。

常用标准

USB 1.x &amp; 2.x： Universal Serial Bus Specification Revision 2.0

USB 3.x：Universal Serial Bus 3.2 Specification

USB 4.x：Universal Serial Bus 4 (USB4®) Specification

Type-C：Universal Serial Bus Type-C Cable and Connector Specification

版本差异

USB各版本的差异如下，每个版本支持的接口不一样，到了USB4，则只支持Type-C接口。…</description>
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