Xilinx is a most significant synthesizing tool for controller design in various engineering field specifically industrial engineering, instrumentation engineering, robotics, telecommunication, computer science engineering etc. To verify the working functionality of devices in these engineering fields, Modelsim simulator is preferred, where the other synthesizing tools are Lattice, Altera, Actel etc. ALDEC simulator and ISE simulators are competitors of Modelsim. Uncomplicated implementation of the device, dynamic power calculation, trouble-free verification of functionality and energetic area calculation can be achieved charmingly in Xilinx and Modelsim compared to their competitors. Architecture of any very large scale integration (VLSI) design, the Xilinx and Modelsim play an imperative role to achieve the hardware efficiency of the design and functionality verification of the design. This paper establishes how these tools create a habitat for designing architecture, by explaining the typical steps involved in elliptic curve cryptography (ECC) processor using Modelsim 5.7 and Xilinx 9.2i. The performance measure options viz. the hardware efficiency, functionality efficiency, area and power calculations are also explored.