This topic describes how a mixed language/mixed flow design that includes Xilinx® HDL blocks, HDL modules, and a Simulink block design can be simulated in its entirety.
Model Composer simulates black boxes by automatically launching an HDL simulator, generating additional HDL as needed (analogous to an HDL test bench), compiling HDL, scheduling simulation events, and handling the exchange of data between the Simulink and the HDL simulator. This is called HDL co-simulation.