a problem with systemc VCD veiw

[mahbod72]

Hi

i write this sample code

in this code i connect two register

i want to trace bus_out signal that is between two register with VCD view

but in VCD view the value of bus_out signal is xxxx

while bus_out must be value!

the image of VCD is attached

// mahbod
#include "systemc.h"

// define reg 16 bit
SC_MODULE (reg16bit) {

sc_in <bool> inc,ld,clr;
sc_in <sc_lv <16> > in16;
sc_out <sc_lv <16> > out16;
sc_in <bool> clk;
void reg_func ();
SC_CTOR (reg16bit) {
SC_THREAD (reg_func);
sensitive << clk.pos();
}
};
// define reg function
void reg16bit::reg_func ()
{
while (1) {
if (ld) 
  out16 = in16;
if (clr)
  out16 = "0000000000000000";
if(inc)
  out16 = (sc_lv <16>)(out16.read().to_int()+1);
wait ();
}
}
//end define reg 16 bit

// defination data path madule
  SC_MODULE(data_path) {
 
    sc_in_clk clk;
    sc_in < sc_lv <16> >  inp;
	sc_in < bool > ld_ac;
	sc_in < bool > inc_ac;
	sc_in < bool > clr_ac; 
	sc_in < bool > ld_inp;
	sc_in < bool > inc_inp;
	sc_in < bool > clr_inp; 
	sc_out < sc_lv <16> > outp; 
	sc_out < sc_lv <16> > bus_out; 
    sc_signal< sc_lv <16> > bus;

reg16bit *AC;
reg16bit *INP;
  
 void process() {
	bus_out = bus.read();
	}

    SC_CTOR(data_path) {

		AC = new reg16bit ("AC");
		AC->inc(inc_ac);
		AC->ld(ld_ac);
		AC->clr(clr_ac);
		AC->in16(bus);
		AC->out16(outp);
		AC->clk(clk);
 
        INP = new reg16bit ("INP");
		INP->inc(inc_inp);
		INP->ld(ld_inp);
		INP->clr(clr_inp);
		INP->in16(inp);
		INP->out16(bus);
		INP->clk(clk); 
    }
	
};

SC_MODULE(test_bench) {
	sc_in_clk clk;
    sc_out < sc_lv <16> > inp;

	sc_out < bool > ld_ac;
	sc_out < bool > inc_ac;
	sc_out < bool > clr_ac;

	sc_out < bool > ld_inp;
	sc_out < bool > inc_inp;
	sc_out < bool > clr_inp;

	sc_in < sc_lv <16> > outp;
	sc_in < sc_lv <16> > bus_out; 
	void process()
	{
		while(1) {

			inp = (sc_lv <16>) "0000000000000110"; 
			wait();
			ld_inp = (bool) 1;
			wait();
			ld_inp = (bool) 0;
			wait();
			ld_ac = (bool) 1;
			wait();
			ld_ac = (bool) 0;
			wait();
			inc_ac = (bool) 1;
			wait();
			inc_ac = (bool) 0;
			wait();
		}
	}

	SC_CTOR(test_bench) {
		SC_CTHREAD(process, clk.pos() );
	}
};


int sc_main(int argc, char* argv[]) {
	sc_clock clk;
    sc_signal < sc_lv <16> > inp;
	sc_signal < bool > ld_ac;
	sc_signal < bool > inc_ac;
	sc_signal < bool > clr_ac;
	sc_signal < bool > ld_inp;
	sc_signal < bool > inc_inp;
	sc_signal < bool > clr_inp;
	sc_signal < sc_lv <16> > outp;
	sc_signal < sc_lv <16> > bus_out;
	data_path *data_p;
	test_bench *tb;


	data_p = new data_path("data_p");
	data_p->clk(clk);
	data_p->inp(inp);
	data_p->ld_ac(ld_ac);
	data_p->inc_ac(inc_ac);
	data_p->clr_ac(clr_ac);
	data_p->ld_inp(ld_inp);
	data_p->inc_inp(inc_inp);
	data_p->clr_inp(clr_inp);
	data_p->outp(outp);
	data_p->bus_out(bus_out);
	

    tb = new test_bench ("testBench");
	tb->clk(clk);
	tb->inp(inp);
	tb->ld_ac(ld_ac);
	tb->inc_ac(inc_ac);
	tb->clr_ac(clr_ac);
	tb->ld_inp(ld_inp);
	tb->inc_inp(inc_inp);
	tb->clr_inp(clr_inp);
	tb->outp(outp);
	tb->bus_out(bus_out);

    sc_trace_file *tf;
	tf = sc_create_vcd_trace_file("BufferTraceFile"); // file extension defaults to ".vcd"
	sc_trace(tf,clk,"clk");
	sc_trace(tf,inp,"inp");
	sc_trace(tf,outp,"outp");
	sc_trace(tf,ld_ac,"ld_ac");
    sc_trace(tf,ld_inp,"ld_inp");
	sc_trace(tf,inc_ac,"inc_ac");
	sc_trace(tf,inc_inp,"inc_inp");
	sc_trace(tf,clr_ac,"clr_ac");
	sc_trace(tf,clr_inp,"clr_inp");
	sc_trace(tf,bus_out,"bus_out");	
	sc_start(100);
	sc_close_vcd_trace_file(tf);
	return 0;
}

[apfitch]

In module "data_path" you've declared a function process() which is never called.

 

I guess you forgot to register process() as an SC_METHOD and make it sensitive to bus?

 

Alan

[mahbod72]

yes i forgot 

i must to insert this

thak you

SC_METHOD(process);
  sensitive<<bus;