loading unisim in modelsim problem while testin xilinx ipcore

I think you have not compiled libraries in xilinx keeping target browser as modelsim. you can do this by selecting the project's fpga package in (on left top browser), in properties u can assign target browser. After u do this when u highlight the package in browser u'll see compile hdl libraries in the window below. compile it and libraries will be compiled in installed XILINX folder(search tht) change the the pref .tcl if ur confident about procedure to add libraries with path or in modelsim u can add libraries just mention the path. after u do this u shld see all the sim libraries (unisim, primsim and coresim) in the modelsim library window(below work library)

you need to compile the unisims library into work library. In verilog "-y unisim_path +libext+.v" serves the purpose. Look into "xilinx synthesis and simulation guide' (from google search) it has the complete procedure

Dear bvkrock Thank you for your help and sorry for this late response. i was trying to follow your procedure for several month and i just got what i should do. i compiled the libraries in the xilinx ISE program as you said. i didn't di any furthur steps and just run modelsim and got no errors. i didn't understood how and what libraries should i add in modelsim but i think i since it is working, it is fine. i hope i encounter no further issiues. with thanks kian PS: just let me explain these stuff again in other words for other people use: to get the unisim library to wrok, you should compile libraries of the fpga you are using. to do this: