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...