Saturday 17 October 2015

Design Exchange Format (DEF) Files

DEF Files

A specification for representing logical connectivity and physical layout of and integrated circuit in ASCII format

A DEF file is used to describe all the physical aspects of a design, including 
- Die size
- Connectivity 
- Physical location of cells and macros on the chip. 

It contains floor-planning information such as 
- Standard cell rows, groups
- Placement and routing blockages
- Placement constraints
- Power domain boundaries. 

It also contains the physical representation for pins, signal routing, and power routing, including rings and stripes.

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