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
[edit]References
[edit]- ↑ LEF/DEF Downloads
- 1 2 Electronic Engineering and Computing Technology, p. 112
- 1 2 Speed Up LEF Generation Times on Huge IC Designs
- ↑ Bob Smith, D2S CEO Aki Fujimura: Curvy Design’s Time Has Come, February 5, 2024
- ↑ Mr. Aki Fujimura
- ↑ Smith, Michael J. S., Application-Specific Integrated Circuits, Addison-Wesley, 1997, page 897.
External links
[edit]- LEF/DEF Language Reference Product Version 5.7 November 2009
- Various versions may be downloaded from the Si2 website