What are Floorplan Module Constraints in VLSI?
There are basically five different type of module constraint. They are as follows:
None
A module has the attribute None, if it is not preplaced in the core design area. A module can be preplaced by moving it to the core area or by loading in a floorplan file where the module’s placement is defined.
Soft Guide
This module constraint is similar to a guide constraint, except there are no fixed locations. This provides stronger grouping for the instances under the same soft guide. Instances within a soft guide are grouped better than those without a soft guide.
Guide
A module is preplaced in the core design area. The placement program honors the preplacement.
Region
A region constraint forces all module instances to be placed within the region, but allows instances from other modules as well.
Fence
A fence constraint forces all instances of the module to be placed within the fence and does not allow any instances from other modules to be placed inside the fence. A module becomes a fence when the module is specified as a partition.