Cadence Ppt
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CADENCECADENCE
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CadenceCadence设计系统介绍设计系统介绍
清华大学微电子所清华大学微电子所
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OUTLINE
Cadence 系统概述
版图设计工具-Virtuoso LE
版图验证工具-Diva
版图验证工具-Dracula
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Cadence 系统概述
Cadence 概述
设计流程
系统组织结构
系统启动
帮助系统
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Cadence 概述
为什么要学习Cadence工具
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Cadence 概述
集成电路发展趋势
年 1997 1999 2001 2003 2006 2009 2012
特征尺寸(nm) 250 180 150 130 100 70 50
最低的电源电压(V) 1.8~2.5 1.5~1.8 1.2~1.5 1.2~1.5 0.9~1.2 0.6~0.9 0.5-0.6
通用集成电路 750 1200 1400 1600 2000 2500 3000
ASIC 300 500 600 700 900 1200 1500
DRAM 280 400 450 560 790 1120 1580
芯片面积(mm2 ) MPU 300 340 385 430 520 620 750
ASIC 480 800 850 900 1000 1100 1300
MPU 3.7M 6.2M 10M 18M 39M 84M 180M
ASIC 8M 14M 16M 24M 40M 64M 100M
桌面式产品 70 90 110 130 160 170 175
便携式产品 1.2 1.4 1.7 2 2.4 2.8 3.2
工作频率
晶体管数/cm2
最大功耗(W)
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Cadence 概述
Answer:市场需求以及工艺技术的发展使得设计
复杂度提高,为满足这样的需求,我们
必须掌握最强大的 EDA 工具。
在目前众多的 EDA 工具中,Cadence的工具最强大也最具竞争力,因而被广泛采用
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Cadence 概述
VHDL仿真VHDLVHDL仿真仿真
行为综合行为综合行为综合
逻辑综合逻辑综合逻辑综合
可测性设计可测性设计可测性设计
低功耗设计低功耗设计低功耗设计
布局布线布局布线布局布线
后仿真后仿真后仿真
SynopsysSynopsysSynopsys AltaAltaAlta
EpicEpicEpicSynopsysSynopsysSynopsys
IKOSIKOSIKOSCadenceCadenceCadence CompassCompassCompassSynopsysSynopsysSynopsys VantageVantageVantage
IKOSIKOSIKOS VantageVantageVantageCadenceCadenceCadence SynopsysSynopsysSynopsys
SynopsysSynopsysSynopsys CompassCompassCompass Mentor GraphicsMentor GraphicsMentor Graphics
CadenceCadenceCadence Avant!AvantAvant!! Mentor GraphicsMentor GraphicsMentor Graphics
SunriseSunriseSunriseSynopsysSynopsysSynopsys CompassCompassCompass
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Cadence 概述
全球最大的 EDA 公司提供系统级至版图级的全线解决方案
系统庞杂,工具众多,不易入手
除综合外,在系统设计,在前端设计输入和仿真,自动布局布线,版图设计和验证等领域居行业领先地位
具有广泛的应用支持
电子设计工程师必须掌握的工具之一
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Cadence 概述
System-Level DesignFunction VerificationEmulation and AccelerationSynthesis/Place-and-RouteAnalog,RF,and Mixed-Signal DesignPhysical Verification and AnalysisIC PackagingPCB Design
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集成电路设计流程
客户客户 功能定义功能定义
电路生成电路生成
功能验证功能验证
测试生成测试生成
布局布线布局布线
后仿真后仿真
算法设计算法设计
逻辑综合逻辑综合
可测性设计可测性设计
低功耗设计低功耗设计
版图验证版图验证
设计规则检查设计规则检查
互连参数提取互连参数提取
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CELL 设计流程
版图单元
验证版图
反标注
打印输出
生成抽象
符号生成
模拟
创建工艺文件
生成参数化单元
生成复杂阵列
单元转换
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系统组织结构
大多数 Cadence 工具使用同样的库模型,库结构按目录结构组织数据,这利于不同工具之间的数据交互和一致操作。
物理组织 逻辑组织
目录 库
子目录 单元
子目录 视图
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系统组织结构
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系统组织结构
DDMS(Design Data Management System)
逻辑名称{cell_1 layout 3.0} DDMS 物理路径
Path/lib/cell_1/layout_3.0
Library.lib
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系统统组织结构
Example
vendlib
dff mux2
gates body
Vhdl.vhd
/usr/proj/vendlib
/usr/proj/vendlib/dff/usr/proj/vendlib/mux2
/usr/proj/vendlib/mux2/gates/usr/proj/vendlib/mux2/body
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系统组织结构
Terms and Definitions
库(library):特定工艺相关的单元集合单元(cell):构成系统或芯片模块的设计对象视图(view):单元的一种预定义类型的表示CIW:命令解释窗口属性(attributes):预定义的名称-值对的集合搜索路径(search path):指向当前工作目录和
工作库的指针
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系统启动
环境设置1 .cshrc 文件设置
.cshrc文件中指定 Cadence 软件和 licence 文件所在的路径
2 .cdsenv 文件设置.cdsenv 文件包含了 Cadence 软件的一些初始设置,该文件用 SKILL 语言写,Cadence 可直接执行
3 .cdsinit 文件设置4 cds.lib 文件设置
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系统启动
5 工艺文件(technology file)技术文件包含了设计必需的很多信息,对设计,尤其
是版图设计很重要。它包含层的定义,符号化器件定义,几何、物理、电学设计规则,以及一些针对特定Cadence 工具的规则定义,如自动布局布线的规则,版图转换成 GDSII 时所使用层号的定义。
6 显示文件(display.drf)
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系统启动
系统启动
1 前端启动命令
前端设计加布局规划
xlicca
前端模拟、混合、微波设计
micms
icde加数字设计环境
sicds
基本数字模拟设计输入
sicde
功能规模命令
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系统启动
2 版图工具启动命令
基本版图设计(具有自动化设计工具和交互验证工具)
mlayoutPlus
基本版图设计(具有交互DRC 功能)
slayout
功能规模命令
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系统启动
3 系统级启动命令
前端到后端大多数工具
xlicfb
混合型号IC设计
lmsfb
Pcb 设计sswb
功能规模命令
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系统启动
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系统启动
Command Interpreter Window(CIW)
Log 文件 窗口号输出域
命令提示行
输入域
鼠标按钮提示
菜单栏
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帮助系统
两种方式寻求帮助
1 openbook在UNIX提示符下输入命令 openbook:host >openbook &
2 工具在线帮助每个工具右上角的“help”菜单
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OUTLINE
Cadence 系统概述
版图设计工具-Virtuoso LE
版图验证工具-Diva
版图验证工具-Dracula
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版图设计工具-Virtuoso LE
Virtuoso Layout Editor-版图编辑大师
Cadence最精华的部分在哪里
Virtuoso Layout Editor界面漂亮友好
操作方便高效
功能强大完备
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版图设计工具-Virtuoso LE
目标
理解 Layout Editor 环境
学会如何使用 Layout Editor
学会运行交互 DRC&LVS
学会将设计转为Stream format
学会定制版图编辑环境
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版图设计工具-Virtuoso LE
单元设计具体流程
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Virtuoso LE 使用介绍
第一步:建库执行:CIW->Tools->Library Manager…
LM->File->New->Library…
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Virtuoso LE 使用介绍
第二步:指定工艺文件
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Virtuoso LE 使用介绍
第三步:建立版图单元
执行:LM->File->New->Cell View…
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Virtuoso LE 使用介绍
第四步:打开版图单元
执行:CIW->File->Open…
选择库
选择视图
选择单元
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版图设计工具-Virtuoso LE
版图编辑环境
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版图设计工具-Virtuoso LE
Virtuoso Layout Editing
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版图设计工具-Virtuoso LE
LSW-层选择窗口
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版图设计工具-Virtuoso LE
设置有效 Drawing 层执行:LSW->Edit->Set Valid Layers…
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版图设计工具-Virtuoso LE
Display Resource Editor
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版图设计工具-Virtuoso LE
Layers and display.drf
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版图设计工具-Virtuoso LE
Set Display Options
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版图设计工具-Virtuoso LE
Set Editor Options
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版图设计工具-Virtuoso LE
鼠标用法
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版图设计工具-Virtuoso LE
工艺文件流图
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版图设计工具-Virtuoso LE
Technology File 命令
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版图设计工具-Virtuoso LE
主要编辑命令Undo-取消Redo-恢复Move-移动Copy-复制Stretch-拉伸Delete-删除Merge-合并Search-搜索
编辑命令非常友好,先点击命令,然后对目标图形进行操作
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版图设计工具-Virtuoso LE
主要创建命令Rectangle-矩形Polygon-多边形Path-互联Label-标签Instance-例元Contact-通孔
现在LSW中选中层,然后点击创建命令,在画相应图形
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绘制反相器版图
INV Example首先回顾一下CMOS反相器制作流程:
Stage 1:
N wellP well
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绘制反相器版图
Stage 2:
P diffusion N diffusion
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绘制反相器版图
Stage 3:Poly gate
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绘制反相器版图
Stage 4:
P+ implant N+ implant
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绘制反相器版图
Stage 5:
contact
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绘制反相器版图
Stage 6:
Metal 1
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绘制反相器版图
Stage 7:via
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绘制反相器版图
Stage 8:
Metal 2
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绘制反相器版图
OK!!!
版图编辑工具使用
器件加工工艺流程
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绘制反相器版图
1
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绘制反相器版图
2
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绘制反相器版图
3
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绘制反相器版图
4
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绘制反相器版图
5
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绘制反相器版图
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绘制反相器版图
7
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绘制反相器版图
8
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绘制反相器版图
9
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Virtuoso Layout Editor
现在,您已经掌握版图编辑大师的基本
操作,通过上机实验巩固和提高!
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CadenceCadence设计系统介绍设计系统介绍
清华大学微电子所清华大学微电子所
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OUTLINE
Cadence 系统概述
版图设计工具-Virtuoso LE
版图验证工具-Diva
版图验证工具-Dracula
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设计流程
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版图验证
版图验证的必要性?
确保版图绘制满足设计规则
确保版图与实际电路图一致
确保版图没有违反电气规则
可供参数提取以便进行后模拟
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版图验证
IC 后端流程图:
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Cadence 版图验证工具
DivaDiva 是 Cadence 的版图编辑大师Virtuoso集成的交互式版图验证工具,具有使用方便、操作快捷的特点,非常适合中小规模单元的版图验证。
DraculaDracula(吸血鬼)是 Cadence 的一个独立的版图验证工具,按批处理方式工作,功能十分强大,目前是完整芯片验证的标准。
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版图验证工具-DIVA
Diva -Design Interactive Verification Automation
DIVA 是 Cadence软件中的验证工具集,用它可以找出并纠正设计中的错误.它除了可以处理物理版图和准备好的电气数据,从而进行版图和线路图的对查(LVS)外。还可以在设计的初期就进行版图检查,尽早发现错误并互动地把错误显示出来,有利于及时发现错误所在,易于纠正。
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版图验证工具-DIVA
Diva 工具集组成:
1.设计规则检查(iDRC)2.版图寄生参数提取(iLPE)3.寄生电阻提取(iPRE)4.电气规则检查(iERC)5.版图与电路图一致比较(iLVS)
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版图验证工具-DIVA
Remark:1. Diva中各个组件之间是互相联系的,有时候一个组件的执行要依赖另一个组件先执行。
例如:要执行LVS就先要执行DRC。2. 运行 Diva 之前,要准备好规则验证文件,这些文件有默认名称:做DRC时的文件应以divaDRC.rul命名,版图提取文件以divaEXT.rul命名。做LVS时规则文件应以divaLVS.rul命名。
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版图验证工具-DIVA
DIVA功能DRC
Extractor
ERC
LVS
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版图验证工具-DIVA
DRC:对 IC 版图做几何空间检查,以确保线路能够被特定加工工艺实现。
ERC:检查电源、地的短路,悬空器件和节点等电气特性。
LVS:将版图与电路原理图做对比,以检查电路的连接,与MOS的长宽值是否匹配。
LPE:从版图数据库提取电气参数(如MOS的W、L值BJT、二极管的面积,周长,结点寄生电容等)并以Hspice 网表方式表示电路。
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版图验证工具-DIVA
DIVA工具流程
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版图验证工具-DIVA
Design Rule Checking
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版图验证工具-DIVA
DRC 界面
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版图验证工具-DIVA
Checking Method指的是要检查的版图的类型:
Flat 表示检查版图中所有的图形,对子版图块不检查。
Hierarchical利用层次之间的结构关系和模式识别优化,检查电路中每个单元块内部是否正确。
hier w/o optimization 利用层次之间的结构关系而不用模式识别优化,来检查电路中每个单元块 。
Checking Limit 可以选择检查哪一部分的版图: Full 表示查整个版图
Incremental 查自从上一次DRC检查以来,改变的版图。
by area 是指在指定区域进行DRC检查。一般版图较大时,可以分块
检查。
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版图验证工具-DIVA
Switch Names 在DRC文件中,我们设置的switch在这里都会出现。这个选项可以方便我们对版图文件进行分类检查。这在大规模的电路检查中非常重要。
Echo Commands 选上时在执行DRC的同时在CIW窗口中显示DRC文件。
Rules File 指明DRC规则文件的名称,默认为divaDRC.rul
Rules Library 这里选定规则文件在哪个库里。
Machine 指明在哪台机器上运行DRC命令。
local 表示在本机上运行。对于我们来说,是在本机运行的,选local。
remote 表示在远程机器上运行。
Remote Machine Name 远程机器的名字。
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版图验证工具-DIVA
Diva 查错:错误在版图文件中会高亮显示,很容易观察到。另外也可以选择Verify-Markers-Find菜单来帮助找错。单击菜单后会弹出一个窗口,在这个窗口中单击apply就可以显示第一个错误。
同样,可以选择Verify-Markers-Explain来看错误的原因提示。选中该菜单后,用鼠标在版图上出错了的地方单击就可以了。也可以选择Verify-Markers-Delete把这些错误提示删除。
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版图验证工具-DIVA
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版图验证工具-DIVA
分析错误(Explain)
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版图验证工具-DIVA
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版图验证工具-DIVA
Extractor
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版图验证工具-DIVA
Extractor 功能提取器件和互联信息用于 ERC 或 LVS提取网表
提取有寄生参数的版图网表用于模拟
提取层次FlatHierarchicalMicro
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版图验证工具-DIVA
Extractor 界面
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版图验证工具-DIVA
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版图验证工具-DIVA
LVS
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版图验证工具-DIVALVS
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版图验证工具-DIVA
LVS Check
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版图验证工具-Dracula
Dracula (吸血鬼)是 Cadence 的一个独立的版图验证工具,它采用批处理的工作方式。Dracula 功能强大,目前被认为布局验证的标准,几乎全世界所有的IC 公司都拿它作 sigh-off 的凭据。特别是对整个芯片版图的最后验证,一定要交由 Dracula 处理。
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版图验证工具-Dracula
Basics of Dracula Verication版图验证与工艺相关-需要工艺信息数据库
版图验证输入-版图数据(GDSII格式);网表信息(用于LVS);工艺相关信息验证方式-Incremental VS Full chip
Hierarchical VS FlattenOnline VS offline
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版图验证工具-Dracula
Dracula 主要功能:1.设计规则检查-DRC *2.电气规则检查-ERC3.版图&原理图一致性检查-LVS *4.版图参数提取-LPE5.寄生电阻提取-PRE
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版图验证工具-Dracula
Dracula 的处理流程
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版图验证工具-Dracula
How to Use Dracula Tool
创建/获取命令文件;填充设计数据信息;编译命令文件;提交执行文件;查询验证结果报表并修改错误;
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版图验证工具-Dracula
版图->GDSII 格式转换WHY:Dracula 处理对象是GDSII文件
操作步骤:执行:CIW->File->Export->Stream…弹出如下窗口:
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版图验证工具-Dracula
运行目录
输出文件名
What is this?
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版图验证工具-Dracula
It is this,the two unitsshould be consistent!
These two items should bechanged according to your design
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版图验证工具-Dracula
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Dracula-DRC
Function of DRC检查布局设计与制程规则的一致性;基本设计规则包括各层width,spcing及不同层之间的spcing,enclosure等关系;设计规则的规定是基于process variation, equipment limitation,circuit reliability;特殊情况下,设计规则允许有部分弹性;
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Dracula-DRC
Find DRC Errors with InQuery
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Dracula-DRC
Dracula DRC 验证步骤:1. 把版图的GDII文件导出到含有DRC规则文件的目录(run directory)下;
2. 更改DRC文件中的INDISK和PRIMARY值;
3. 在xterm中,进入含DRC规则文件的运行目录下,依次输入如下命令:
% PDRACULA%:/get DRC文件名%:/fi% jxrun.com
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Dracula-DRC
4. 打开待检验单元的版图视图,在工作窗口选择Tools->Dracula Interface(对于4.45以下版本,选择Tools->InQuery),工具菜单里多出DRC、LVS等项。
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Dracula-DRC
5. 选择DRC->setup,弹出如下图所示对话框,在Run Directory栏中填入运行DRC的路径后,点OK,打开的版图中会出现错误标记。
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Dracula-DRC
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Dracula-LVS
Dracula LVS(包含器件提取)步骤:1.把版图的GDSII文件导出到含有LVS规则文件的目录;
2.把单元的hspice网单文件导出到含有LVS规则文件的目录;
3.更改LVS规则文件中的INDISK和PRIMARY值;4.在控制终端的含LVS规则文件的目录下输入:%LOGLVS%:cir 网单文件名
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Dracula-LVS
%:con 原理图单元名%:x%PDRACULA%:/get LVS规则文件名%:/fi%jxrun.com
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Dracula-LVS
LVS 比较结果查看:按上述步骤执行完LVS后,工作目录下会生成名为lvsprt.lvs的文件,打开此文件可以查看LVS结果报告。如果版图与电路图匹配,会显示“LAYOUT AND SCHEMATIC MATCHED”,否则,会列出Discrepancy项,并注有不能匹配的部分在版图中的坐标和网单中的器件名。
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Dracula-LVS
InQuery for LVS Setup environment for lvs
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Dracula-LVS
Select error
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Dracula-LVS
Display net or device
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Dracula-LVS
Schematic->CDL网表转换:CIW->File->Export->CDL…
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Dracula-LVS
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Remarks
Layout DesignSetup for the DesignWorkflow for the Cell-based DesignConcept of Hierarch Design
Layout VerificationSetup for the VerificationConsistent Node NameDebug with Design Rule in Mind
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Remarks
Experiment DemoDesign StytleCapture Process
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Layout Design
SetupSet valid layers and Save the information as file.Set display format of the layers and Save the information as file. Set convention Bindkeys by copying the default .cdsinit file.Set minor spacing.
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WorkflowCell-based Design methodology.Design three different sizes inverter layout cellviews according to experiment directive.Verify the three inverters separately.Create a new top cell referring to the existing three low level verified inverters.Verify the top cell.
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Hierarchy
Top cell
initancenest
Bottom cell
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SetupSet command files:Diva: divaEXT.rul,divaLVS.rulDracula:06drc.com,06mylvs.comExport object files:gds file and spice netlistPort name must be consistentLayout must comply with the design rules.
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