LEF/DEF

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LEF/DEF or Library Exchange Format and Design Exchange Format is an accepted standard representing the physical layout of an integrated circuit in an ASCII format. It is a pair of formats, LEF and DEF, commonly used in conjunction. They are supported by Cadence Design Systems and distributed by Si2 under the Apache-2.0 permissive free-software license. Their most common use is place and route (P&R) tools. [1] [2]

Contents

The DEF file contains all information related to the particular electronic circuit design: design constraints, layout, netlist. The LEF file contains library information related to cells and modules used in the design, as well as information about layers, vias, P&R boundary and some other information useful for P&R. [2] [3]

LEF and DEF were developed at Tangent Systems by Aki Fujimura for their place and route tools, [4] [5] which were bought by Cadence in 1989. [6] [3]

See also

References

  1. ↑ LEF/DEF Downloads
  2. 1 2 Electronic Engineering and Computing Technology, p. 112
  3. 1 2 Speed Up LEF Generation Times on Huge IC Designs
  4. ↑ Bob Smith, D2S CEO Aki Fujimura: Curvy Design’s Time Has Come, February 5, 2024
  5. ↑ Mr. Aki Fujimura
  6. ↑ Smith, Michael J. S., Application-Specific Integrated Circuits, Addison-Wesley, 1997, page 897.
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