1034997182allegro constraints manager for workshop.ppt

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1、Constraint Manager,楚留宾 Robin ChuMobile:13762923502Email:,version 1.00,Robin Chu,Lesson Objectives,Electrical Differential PairRelative Propagation DelayPhysical Physical Constraint SetNetRegionSpacing Spacing Constraint SetNet(Net Class-Class)RegionDrc,3,Selecting a Worksheet,Tree widgets are used t

2、o access worksheets.The top-most categories are ECSets and Nets.Under each category,constraints and properties are divided by discipline.These can be opened for access to entire workbook.Bottom-most expansion will open specific tab in workbook.,Workbook,Worksheet,4,The User Interface for Managing Co

3、nstraints,Object column,ECSetreference,Constraintvalues,5,Design Objects,The first column in every spreadsheet:Displays the objects in a hierarchical fashion Is collapsibleAllows for setting constraints at the highest level and applying overrides at lower levels as necessary,Electrical Constraint Se

4、t References,The second column for Net spreadsheets:Contains the ECSet that is applied to that object,which can be a Bus,Diff Pair,XNet,or NetIs usually in collapsed form to appear as a“check box”Can be expanded to display actual ECSet name,7,Viewing Constraint Values,Columns define a constraint:For

5、 ECSets the columns contain constraint values.For Nets additional columns contain result information.,8,Controlling Colors,Cells are color coded to indicate inheritance for constraints and status for results.,Use View Options tochange cellcolor coding.,Status Indicators,Located in lower left-hand co

6、rner of user interface windowProvides information on specific items in the displayProgress Meter for simulationsBrief descriptions of commandsReasons why items are inactive out,Placing cursor overobject will result inmessage below,Creating an Electrical Constraint Set,11,Copying Electrical Constrain

7、t Sets,ECSets can be copied from existing ECSets.,Importing Electrical Constraint Sets,CM User Interfacesupports multiple selections.,ECSets can be imported.Looks for.top files on disk.,Referencing Electrical Constraint Sets,ECSet references can be driven from ECSet or Net objects.,Analyzing Constra

8、ints,Analyze Analysis Modes,Working With Differential Pairs,Viewing Differential Pair Constraints,Differential Pair Worksheets,Calculating Differential Pair Impedance,Differential Calculator,Defining Differential Pairs,Auto-generate differential pairsKeys on common net names,Differential Pair Object

9、s,Differential pair objects are displayed under the design object,with the individual net objects underneath the differential pair object.,Setting Differential Pair Constraints,Differential Pair Line Spacing,Primary Gap,Coupled Tolerance(+),Coupled Tolerance(-),Minimum Line Spacing,Coupled Tolerance

10、,HORIZONTAL LINE SEGMENT(775.00 601.00)(Width=6.00)HORIZONTAL LINE SEGMENT(770.00 580.00)(Width=6.00)Dist=21.5870 Total Dist=21.5870 Manhattan Dist=26.0000 Dx=5.0000 Dy=21.0000 Air Gap=15.0000,ODD-ANGLE LINE SEGMENT(608.75 516.35)(Width=6.00)ODD-ANGLE LINE SEGMENT(586.40 523.60)(Width=6.00)Dist=23.5

11、275 Total Dist=23.5275 Manhattan Dist=29.7000 Dx=22.3500 Dy=7.3500 Air Gap=15.0011,ODD-ANGLE LINE SEGMENT(1000.15 654.85)(Width=6.00)ODD-ANGLE LINE SEGMENT(1015.00 640.00)(Width=6.00)Dist=21.0011 Total Dist=21.0011 Manhattan Dist=29.7000 Dx=14.8500 Dy=14.8500 Air Gap=15.0011,Uncoupled Length,Violati

12、ng the Maximum Uncoupled Length constraint creates a DRC marker in the layout and the Constraint Manager.The uncoupled conductor is highlighted in the layout.,Gather Control,Setting the Gather Control to Ignore will allow conductor to enter and exit pins without the conductor being included as uncou

13、pled length.,Not included as uncoupled length when Gather Control is ignored.,Static Phase Tolerance,Use the static phase tolerance to account for required differences in the lengths of a differential pair.,Dynamic Phase Control,Running skew rules require compensation within specified distance.Stati

14、c phase control limits skewing within a differential pair.Dynamic phase control maintains noise immunity within a differential pair.,Dynamic Phase Control Markers,Layer-Based Diff Pair Values,Lab,Create differential pair using electrical constraint set follow the rule as blow:(using XCVR_RX)Primary

15、Gap=10milPrimary Width=3milNeck Gap=5milMin line spacing=4.99milTolerance=+/-0.01 milUncouple length=200 milPhase tolerance=10milGather control=ignore,Relative Propagation Delays,Creating a Match Group,Setting Relative Propagation Delay Constraints,Creating Pin Pairs,Example:Matched Delays,Routing R

16、ules for Project:Very Simple1.)All XCVR_RX differential pair lengths must be matched within 300 mils.2).All BRIDGE_RX differential pair lengths must be matched within 500 mils.,Initialization,Invoke the Constraint Managerand open the Relative PropagationDelay Worksheet.,Creating a Matched Group,Sett

17、ing Values for the Matched Group,Turning on the DRC Check,Analyzing the Results,Relative Delays,Changing the Target,Spacing and Physical Rules,Introduction to Physical and Spacing Rules,There are three types of net-based rules:Physical Constraint Set:Line width and layer restrictionsSpacing Constrai

18、nt Set:Clearances between lines,pads,vias,and copper areas(shapes)on different nets.Same Net Spacing Constraint Set:Clearances between lines,pads,vias,and copper areas(shapes)on the same net.For Physical and Spacing rules there are two categories of design rules:Default RulesSpecial Rules,Extended C

19、onstraints,Create Net Classes,Define Extended Constraint Sets,Map Net Classes toExtended Constraint Sets,Creating Net Classes(XPAK_VEND,XPAK_PRTAD),Assigning Objects to Classes,Setting Default Physical Values,Creating a New Physical CSet,1.,2.,3.Select Objects Create Physical CSet,5.Set the new phys

20、ical design rules required,4.,Assign the Net Class to a Constraint Set,or.,RMB,Setting Default Spacing Values,Can also set Surface Mount Pin and Test Pin values,Creating a New Spacing CSet,1.,2.,3.Select Objects Create Spacing CSet,5.Set the new spacing design rules required,4.,Assign the Net Class

21、to a Constraint Set,or.,RMB,Net-Class to Net-Class Spacing,Constraints By Layer,Same Net Constraints,Lab,Create Physical Constraint set 6mil(inner layer)(Width)outer layer=3mil L3&L16=6milNeck Gap=5milMin line spacing=4.99milTolerance=+/-0.01 milUncouple length=200 milPhase tolerance=10milGather con

22、trol=ignore,Constraints By Area,Create New Constraint Set(Spacing,Same Net Spacing and/or Physical),Define Region and Layer,Reference CSet,Create Region-Class Rules,Create Region-Class-Class Rules,Constraints By Area:Defining a Region,Constraints By Area:Referencing a CSet,Constraints By Area:Creati

23、ng Region-Class Rules,The DRC Worksheets,Lab,Create region follow rulesas below(XPAK_VEND,XPAK_PRTAD):Physical:outer layer=6mil inner layer=10mil etch is not allowed on L7-L12Spacing:netclass=5mil netclass to netclass=10mil netclass to other=20milXCVR_RX:Primary Gap=6mil(outer layer);10mil(inner lay

24、er)(Width)outer layer=6mil L3&L16=10milNeck Gap=5milMin line spacing=4.99milTolerance=+/-0.01 milUncouple length=200 milPhase tolerance=10milGather control=ignore,THANK YOU,楚留宾 Robin ChuMobile:13762923502Email:,version 1.00,Accessing a Formula,Creating Cell Based Formulas,Recalculating Formulas,Afte

25、r Recalculating,Creating Large Formulas,1,2,Inserting Cell Values,1,2,Loading and Saving Complex Formulas,The Formula Browser,Custom Measurements,Customizing a Worksheet,Adding a Column,Linking to a Measurement,The Custom Measurement Definition,Predicates,Analyzing the Custom Measurement,Custom Cons

26、traints,Creating Custom Constraints,Additional Information,Using the Constraint Manager in Standalone Mode,Type:“consmgr”at command prompt.,Use File Import Electrical CSets or create from scratch.,Prompt for Saving ECSets appears upon exit.,Showing TLines as Lengths in the Topology Editor,Displaying

27、 Nets of XNets,Turn on Net in Filter.,Including Pin Delays,Pin Delay Options,Turn on the Include Pin Delay Option.The Propagation Velocity Factor is used for conversions when the Pin Delay units do not match the constraint units.,Analyze Analysis Modes,Including Via Lengths,Analyze Analysis Modes,Unrouted Delays,Analyze Analysis Modes,DX,DY,Unrouted length equals DX+DY.,