adding SRAM TO SPARTAN 3 board using xilinx edk

hi... i m new to fpga's ... i want to add an SRAM to my spartan3 board....i m using xilinx 12.1 EDK ....i dont know how to add the sram...so plz tell me how to do this task... can i get the SRAM code from somewhere on internet and add it to the "xbd" file of my board... or i have to code the sram in verilog and then make an instance of it???... if verilog code is available then plz tell me how to proceed with it ?? is there any other way xpct using verilog code??? reply plz...