I want to start some work on the xilinx system generator in simulink, any ideas or tutorials/sample projects on where should i start?, also when i made an inverter in simulink using the system generator, it compiled in matlab just fine, but when i try to simulate it in Xilinx ISE, it gives errors and makes like 7 inverters in parallel (in the RTL design part)...
Yes, the SysGen Getting Started Guide (UG639 if memory serves) will be a good place to start. In the Simulink help, there are a number of SysGen demos and example designs. Also, in your Xilinx install directory under %XILINX%/ISE_DS/ISE/sysgen/examples/getting_started_training there are a number labs with solutions. That should get you started!