Array Of Ports/Signals

SystemC allows to declare Array of ports and signals. This is very useful when we need to create array of similar ports and signals. 

Below examples shows how to use of array of ports and signals.

Example : Array Of Ports/Signals

  1 #include

  2

  3 SC_MODULE(ports_arrays) {

  4   sc_in<sc_uint<2> > a[4];

  5   sc_in<sc_uint<2> > b[4];

  6   sc_out<sc_uint<3> > o[4];

  7

  8   void body () {

  9     int i;

 10     for (i=0; i < 4; i ++) {

 11       o[i].write(a[i].read() + b[i].read());

 12     }

 13   }

 14

 15   SC_CTOR(ports_arrays) {

 16     int j;

 17     SC_METHOD(body);

 18       for (j=0; j<4; j++) {

 19         sensitive << a[j] << b[j];

 20       }

 21   }

 22 };

 23

 24 // Testbench to generate test vectors

 25 int sc_main (int argc, char* argv[]) {

 26   sc_signal<sc_uint<2> > a[4];

 27   sc_signal<sc_uint<2> > b[4];

 28   sc_signal<sc_uint<3> > o[4];

 29

 30   int z;

 31

 32   ports_arrays prt_ar("PORT_ARRAY");

 33     for (z=0; z<4; z++) {

 34       prt_ar.a[z](a[z]);

 35       prt_ar.b[z](b[z]);

 36       prt_ar.o[z](o[z]);

 37     }

 38   sc_start(0);

 39   // Open VCD file

 40   sc_trace_file *wf = sc_create_vcd_trace_file("ports_arrays");

 41   ((vcd_trace_file*)wf)->sc_set_vcd_time_unit(-5);

 42     for (z=0; z<4; z++) {

 43       char str[3];

 44       sprintf(str, "(%0d)",z);

 45       sc_trace(wf,a[z],"a" + string(str));

 46       sc_trace(wf,b[z],"b" + string(str));

 47       sc_trace(wf,o[z],"o" + string(str));

 48     }

 49   // Start the testing here

 50   sc_start(1);

 51   for (z=0; z<4; z++) {

 52     a[z] = rand();

 53     b[z] = rand();

 54     sc_start(1);

 55     cout << "@" << sc_time_stamp() <<" a : " << a[z]

 56       << " ,b : " << b[z] << " ,o : " << o[z] << endl;

 57   }

 58   sc_start(2);

 59

 60   sc_close_vcd_trace_file(wf);

 61   return 0;// Terminate simulation

 62 }

Simulation Output : Array Of Ports/Signals

             SystemC 2.0.1 --- Oct  6 2006 19:17:37

         Copyright (c) 1996-2002 by all Contributors

                     ALL RIGHTS RESERVED

 WARNING: Default time step is used for VCD tracing.

 @2 ns a : 3 ,b : 2 ,o : 5

 @3 ns a : 1 ,b : 3 ,o : 4

 @4 ns a : 1 ,b : 3 ,o : 4

 @5 ns a : 2 ,b : 0 ,o : 2

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