DRC Manager.ppt [Read-Only]

DRC Tool Evolution• DRC Walker posted on Cadence Website•DRC Browser developed at Intel 8 years ago•DRC Manager, the 2004 version2

5The DRC Manager

DRC Sort CriteriaToolPopdownLayerPopdownRulePopdownDispositionPopdownPriorityPopdown7

Search – Works on all displayed columnsVSS SearchXXG? Search8

Grid of Sort ResultsBalance of selected fieldsNote flag, if anyPriority, if anyDisposition, if anyCheck box to multipleselect for dispositioning9

10Desired Information is Definable

11Expandable

12Utility – Right Menu Button

Select AllInternal DRCDeletenotallowed13

DispositioningActs on currently active DRCor all the selectedBottom Line Buttons14

15Adding a Note

Notes displayed on the Message LineNote indicatorKeyboardArrow KeysmoveUp/DwnNote content16

17Report

18DRC Display

Basic Mechanisms of the DRC ManagerDRCsGiven Integer PropertyRule NameDRC Data Table111, 136, 143, etc171Layer 1Layer 22, 53, 111, 123, etc1, 17, 18, 19, 44, etcAttachmentDialog Grid19

Attachment Name Code31 characters maxX w _ d r c _ 0 0 1 7 1 1 8 4Fixed “drc _”XY CoordinateID NumberPriority: H=high, M=medium, L=lowDisposition: W=waived, N=need to fix, F=fixedType: I = internal, X = external20

Attachment Data Contents• Tool acronym – PLA, DFE, etc• Rule Name• Rule Description• Layer• Actual Value• Net1 Name• Net2 NameDelimited string• Note or Waive ReasonThe first three items come from a structured value inthe EXTERNAL_VIOLATION_DESCRIPTION property21

First StepReconcile DRCs to Attachments• Get DRCs with ID properties and match withexisting attachments• Log ID numbers used• Attempt to match DRCs without IDs with existingattachments, assigns attachmment ID to DRC• Discard remaining attachments• Create new attachments for remaining DRCsusing number gaps between numbers usedThis allows the Dispositions assigned to be persistantfor the dynamic internal (Allegro) DRCs22

Second StepCreate DRC Data Table• Entry indices created on the fly• Entry for each rule and layer – list of IDs• Prevents collision with Global Variables• Memory retrieved with gc()• Example:– drcData[‘formform] ] contains the dialog dbid– drcData[‘Trace_WidthTrace_Width] ] contains a list of integers ofDRCs violating this rule– drcData[‘SURFACESURFACE] ] contains a list of integers ofDRCs on this layerTable indices are composed of rule names withspaces replaced by underlines23

Grid Populated &Form Displayed24

Coding Hints• Create Table with nil as the default valueotherwise, if drcData[‘zoomDRCzoomDRC] ] is not definedthe conditional statement if( drcData[‘zoomDRCzoomDRC]will yield true. It’s s value is ‘unbound• Reconcilling DRCs to attachments yieldspersistent dispositions.• Rule names used as table indices should havespaces in their name replaced with underscores• "EXTERNAL_VIOLATION_DESCRIPTION“property value should be structured• A master attachment should save all dialogsettings and be used to initialize any new dialog,store settings, and import/export preferences25

Additional Features• Inline Invocation of Visibility & Disposition• Export Dispositions – written to a file to be read intoanother copy of the same design. Deals exclusively withattachments.• Export Settings – written to a file to be read into anotherdesign. Recreates the “Master” attachment.• Best solution would be to incorporate directly into Cadence26

27Command Line Invocation

?? Questions ??Settings saved in a “Master” attachment and restored28

Browser vs. ManagerProblemSolution• Not resizable? Attempted to maintain lists of dbids? Secondary Select By ID mechanism• Slow response to changing criteria? Limited information readily available? Used global variables?Sizeable Grid?Attachments?Only mechanism?Better Response?Definable Info?Uses Table29