EDIF Conversion Flow with Gateway

EDIF Conversion Flow with Gateway
 EDIF is the acronym for Electronic Document Interchange Format
 EDIF is a standard for transferring schematic data between two
 EDIF 2 0 0 files from Cadence, Viewdraw, PSPICE, or OrCAD can all be
Existing Schematic/Symbol Database
Gateway Schematic Editor
symbol libraries
EDIF 2 0 0
Any tool capable
of EDIF 2 0 0
EDIF Conversion Flow with Gateway
 EDIF 2 0 0 General Limitations
 EDIF is a university-driven standard, not foundry-driven
 Schematics, unlike GDSII files, cannot be streamed-in and out
 Information may be lost through both exporting and importing of the
same file
 Successful parsing by University of Manchester Parser is the only
guarantee that a file is EDIF 2 0 0 compliant
 Some EDA vendors use vendor-specific fields where information cannot
be seen by other vendors
 Arrayed instances are not converted easily
 Buses and ripping are generally handled differently between vendors
 Many symbol attribute names are not similar between vendors
 Schematic grids and snap-grids are vastly different between vendors
 Schematic hierarchies may not ascend and descend after export/import
EDIF Conversion Flow with Gateway
 Uses floating-point grid instead of integer grid
 Symbol sizes can be exceedingly large in comparison to standard Gateway
 Some PSPICE device attributes differ from the corresponding devices in
 Some pins and wires are off-grid and must be attached using auto-snapping
 OrCAD and PSPICE exports differ and must be scaled accordingly
 Differences between PSPICE and SmartSpice in terms of general syntax and
subcircuit instantiation
 MicroSIM PSPICE users need to first convert designs to OrCAD CAPTURE
and then EDIF out
 Viewdraw
 Viewdraw schematics do not require pins when pushing down from parent
 Device parameter name fields are different than for SmartSpice
EDIF Conversion Flow with Gateway
 Conversion Capabilities of Gateway
 Most nodes are retained by name and probe-able through hierarchy
 Device reference designators retained wherever possible
 Imported symbol libraries automatically written to gateway workspace
 Symbol browser automatically generated for imported symbols
 Attribute visibilities retained wherever possible
 Attribute values retained for all OrCAD “VALUE” fields
 Hierarchy recognizable in Gateway
 Hierarchy navigation up and down through cells
 Device wiring retained for connectivity and rubberbanding
 Additional Importing Options
 Ability to filter out unwanted, cosmetic, or irrelevant device parameters during
 Resolves differences in case when importing
 Filters out node and net name characters which Smartspice does not understand
 Option to convert symbol footprints and designs to the Gateway grid
EDIF Conversion Flow with Gateway
 Positions, connectivity, parameter values are kept
 Native libraries are faithfully imported
 Naming, wiring, and connectivity is intact
EDIF Conversion Flow with Gateway
Libraries automatically imported
and written to the workspace
Nodes and names are retained
and highlighted thru hierarchy
Imported symbols scaled
and previews generated
Searchable schematic database
Hierarchy Browser
Verbose session log containing
All import messages and errors
Preview pane to show zoom
Location relative to entire schematic
EDIF Conversion Flow with Gateway
 Do NOT EDIF export IP that does not need rework
 Review all Export fields accordingly before actually exporting to EDIF
 Export designs from top-level schematic
 Export symbol libraries by instantiating all instances in the library to a
schematic and then export the schematic
 Primitive devices (M, Q, R, C, etc..) must be converted first and given
SmartSpice attributes for netlisting
 Use both “Instance Replacement Method” and “Edit-in-Place Method”
 Edit-in-Place – converting symbol master file from instances on imported
 Instance Replacement – use of the Change Symbol dialog to globally convert
when changes are made
 Use the Gateway User Manual Chapter 9 for specific detailed instruction
EDIF Conversion Flow with Gateway
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