I have used system generator in matlab to implement amplitude modulation but I'm unable to see output on the scope screen I tried several ways.Buts the same circuit is working when implemented using simulink library or DSP library.
How did set you fixed point data width and binary point in Gateway In block and other xilinx sysgen blocks? NOTE signal type in Simulink is double precision floating point, while in Xilinx sysgen it's fixed point, Gatway IN block is used to convert the Simulink double precision floating point to fixed point size. That said, you can add scope to view the output of Gateway in block. If you are unable to see output on scope, you need to increase the input signal data range or modify the Gateway in parameter settings.