LEF/DEF

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]

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. ^ a b Electronic Engineering and Computing Technology, p. 112
  3. ^ a b 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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