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Design Exchange Format

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Design Exchange Format (DEF) is an open specification for representing physical layout of an integrated circuit in an ASCII format. It represents the netlist and circuit layout. DEF is used in conjunction with LEF to represent complete physical layout of an integrated circuit while it is being designed.

Latest version of DEF is 5.6. DEF was developed by Cadence Design Systems.

[1] LEF/DEF 5.5 Language Reference, Product Version 5.5

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