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以下内容摘自：《System Generator for DSP, Getting start Guide》, Xilinx Corporation, 2012
Defining the FPGA Boundary
System Generator works with standard Simulink models. Two blocks called “Gateway In” and “Gateway Out”define the boundary of the FPGA from the Simulink simulation model. The Gateway In block converts the floating point input to a fixed-point number. You double-click on the block to bring up the properties editor which is where the fixed-point number can be fully specified.
Defining the FPGA Boundary
System Generator works with standard Simulink models. Two blocks called “Gateway In” and “Gateway Out”define the boundary of the FPGA from the Simulink simulation model. The Gateway In block converts the floating point input to a fixed-point number. You double-click on the block to bring up the properties editor which is where the fixed-point number can be fully specified.