Use in such applications are expressly - prohibited. Xilinx products are not intended for use in life support appliances, - devices, or systems. XILINX EXPRESSLY - DISCLAIMS ANY WARRANTY WHATSOEVER WITH RESPECT TO THE ADEQUACY OF THE - IMPLEMENTATION, INCLUDING BUT NOT LIMITED TO ANY WARRANTIES OR - REPRESENTATIONS THAT THIS IMPLEMENTATION IS FREE FROM CLAIMS OF - INFRINGEMENT, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A - PARTICULAR PURPOSE. BY - PROVIDING THIS DESIGN, CODE, OR INFORMATION AS ONE POSSIBLE - IMPLEMENTATION OF THIS FEATURE, APPLICATION OR STANDARD, XILINX IS - MAKING NO REPRESENTATION THAT THIS IMPLEMENTATION IS FREE FROM ANY - CLAIMS OF INFRINGEMENT, AND YOU ARE RESPONSIBLE FOR OBTAINING ANY - RIGHTS YOU MAY REQUIRE FOR YOUR IMPLEMENTATION. XILINX IS PROVIDING THIS DESIGN, CODE, OR INFORMATION 'AS IS' SOLELY - FOR USE IN DEVELOPING PROGRAMS AND SOLUTIONS FOR XILINX DEVICES. Use with non-Xilinx - devices or technologies is expressly prohibited and immediately - terminates your license. Why would Xilinx have their own simulator? Do they feel their license fees to Mentor Graphics are becoming too large? What is their plan with ISim?Īny opinions or inside information are more than welcome in the comments.- This file is owned and controlled by Xilinx and must be used solely - for design, simulation, implementation and creation of design files - limited to Xilinx devices or technologies. It seems like Xilinx makes it easier for their customers to choose ISim. Also, Xilinx ships its own simulator, ISim, packaged with its ISE design suite, while Modelsim comes as a separate download. I have noticed that Modelsim Xilinx Edition-III (MXE-III) is only available on Windows, not on Linux. They cannot keep developing high quality EDA tools and sell them at the same low price. Recently, however, FPGA vendors are starting to feel that their budget for EDA tool development is increasing too fast. Teams that create large hardware designs would still need an expensive full version of Modelsim, rather than the free version that comes with their FPGA tools. Xilinx and Altera have always provided EDA tools at a very low cost, and made their money on silicon rather than EDA software.

This was a nice symbioses, since FPGA customers need a simulator in order to create designs. For years, both Xilinx and Altera have provided a free version of Mentor Graphics' Modelsim.

Xilinx modelsim