1.1. IP Core Types
1.1.1. Soft Cores (RTL format)
Technology independent synthesizable RTL description written using any HDL. These can be modifiable and can be extended functionally.
1.1.2. Firm Cores (netlist format)
These IP cores are Gate-level Technology dependent netlists. Internal implementation of core cannot be modified. User can partially modify netlist by parameterizing I/O and to remove unwanted functionality.
1.1.3. Hard Cores (GDSII format)
Tehnology dependant Layout & timing information provided in the format of GDSII. Integration is simple & can result in highly predictable performance.