SystemC is a set of C++ classes and macros which provide an event-driven simulation interface in C++ (see also discrete event simulation). These facilities enable a designer to simulate concurrent processes, each described using plain C++ syntax. SystemC processes can communicate in a simulated real-time environment, using signals of all the datatypes offered by C++, some additional ones offered by the SystemC library, as well as user defined. In certain respects, SystemC deliberately mimics the hardware description languages VHDL and Verilog, but is more aptly described as a system-level modeling language.

initialization of systemc signals :

a signal connected to the port can be initializesd by port.initialize but the signal with in the module can be initialised with in constructor