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.

  1 #include <systemc.h>
  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 }

              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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Deepak Kumar Tala - All rights reserved

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