14 February 2015

Environmental constraints

14.4. Environmental constraints

Both DRC and optimization constraints follow environmental constraints. Setting up of operating conditions and wire load model falls under environmental constraints.


06 February 2015

Timing Constraints

14.3. Timing Constraints




These constraints specify clock related definitions which affect synthesis and timing analysis.

Optimization constraints

14.2 Optimization constraints

Three types of optimizations are possible-area, power and timing. We have optimization constraints related to all these. Synthesis tools assign higher priority to timing constraints over area and power constraints.


Logical DRC constraints

14.1. Logical DRC constraints


DRC constraints exist in library. DRC constraints can’t be relaxed. They can be chosen from library. These constraints are imposed upon the design by requirements specified in the target technology library. This presides over optimization constraints to realize a functional design.