Library Exchange Format and Design Exchange Format (LEF/DEF) are accepted standards for place and route design tools. They are developed by Cadence Design Systems and distributed by Si2. The latest released version of LEF/DEF along with its API Format Specification Reference Documentation is available for download.
LEF/DEF versions are available under the Apache-2.0 license, which can be found at http://www.apache.org/licenses/LICENSE-2.0
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