8 

DEF File Comparison Utility

The Cadence^® Design Exchange Format (DEF) reader provides the following utility for comparing DEF files.

lefdefdiff

Compares two LEF or DEF files and reports any differences between them.

Because LEF and DEF files can be very large, the lefdefdiff utility writes each construct from a file to an output file in the /tmp directory. The utility writes the constructs using the format:

section_head/subsection/subsection/ ... /statement

The lefdefdiff utility then sorts the output files and uses the diff program to compare the two files. Always verify the accuracy of the diff results.

Note: You must specify the -lef or -def, inFileName1, and inFileName2 arguments in the listed order. All other arguments can be specified in any order after these arguments.

Syntax

lefdefdiff

{-lef | -def}

inFileName1

inFileName2

[-o outFileName]

[-path pathName]

[-quick]

[-d]

[-ignorePinExtra]

[-ignoreRowName]

[-h]

Arguments

-d

Uses the gnu diff program to compare the files for a smaller set of differences. Use this argument only for UNIX platforms.

-h

Returns the syntax and command usage for the lefdefdiff utility.

-ignorePinExtra

Ignores any .extraN statements in the pin name. This argument can only be used when comparing DEF files.

-ignoreRowName

Ignores the row name when comparing ROW statements in the DEF files. This argument can only be used when comparing DEF files.

inFileName1

Specifies the first LEF or DEF file.

inFileName2

Specifies the LEF or DEF file to compare with the first file.

-lef | -def

Specifies whether you are comparing LEF or DEF files.

-o outFileName

Outputs the results of the comparison to the specified file.
Default: Outputs the results to the screen.

-path pathName

Temporarily stores the intermediate files created by the lefdefdiff utility in the specified path directory.
Default: Temporarily stores the files in the current directory

-quick

Uses the bdiff program to perform a faster comparison.

Example

The following example shows an output file created by the lefdefdiff utility after comparing two DEF files:

#The names of the two DEF files that were compared.

< in.def

> out.def

#Statements listed under Deleted were found in in.def but not in out.def.

Deleted:

< BLOCKAGE LAYER m3 RECT 455 454 344 890

< BLOCKAGE LAYER m3 SLOTS

< BLOCKAGE LAYER m4 FILLS

< BLOCKAGE LAYER m4 RECT 455 454 344 890

< BLOCKAGE LAYER m5 PUSHDOWN

< BLOCKAGE LAYER m5 RECT 455 454 344 890

< BLOCKAGE PLACEMENT

Deleted:

< BLOCKAGE PLACEMENT PUSHDOWN

Deleted:

< BLOCKAGE PLACEMENT RECT 4000 6000 8000 4000

< BLOCKAGE PLACEMENT RECT 4000 6000 8000 4000

#Changed always contains two statements: the statement as it appears in in.def and the statement as it appears in out.def.

Changed:

< COMP |i1 UNPLACED

< DESIGN muk

---

> DESIGN cell

Changed:

< NET net1 USE SCAN

---

> NET net1 WEIGHT 30 SOURCE TIMING ORIGINAL VDD USE SCAN

Changed:

< NET net3 SOURCE USER PATTERN BALANCED ORIGINAL extra_crispy USE SIGNAL

---

> NET net3 SOURCE USER PATTERN BALANCED ORIGINAL extra_crispy

#Statements listed under Added were found in out.def but not in in.def.

Added:

> NET SCAN ( PIN scanpin )

Added:

> NET net1 ( PIN pin1 )

Added:

> NET net2 ( PIN pin2 )