power monitor part2

在 power monitor part1 中, 我們介紹過 "要如何取得 dynamic Power" 的方式. 底下就用 Systemc 2.0 中 examples/sysc/fir 當例子. 可參考 SystemC 安裝 fir_data.h

#include <power.h>

SC_MODULE(fir_data) {
   
  sc_in<bool>      reset;
  sc_in<unsigned>  state_out;
  sc_in<int>       sample;
  sc_out<int>      result;
  sc_out<bool>     output_data_ready;
  
  sc_int<19> acc;
  sc_int<8> shift[16];
  sc_int<9> coefs[16];

// power 4 sc_in<int>sample 
      TopCss<int> sample_ptr;
      int cur_sample;
      int pre_sample;
 
  SC_CTOR(fir_data)
    { 
      SC_METHOD(entry);
      dont_initialize();
      sensitive << reset;
      sensitive << state_out;
      sensitive << sample;
#include "fir_const.h"

//=================================
// sample signal Dynamic model
//=================================

      SC_METHOD(sample_DyPW);
      dont_initialize();
      sensitive << sample;
      sensitive << reset;
    
      cur_sample =0;
      pre_sample =0; 
   };

  void entry();
  void sample_DyPW();
};

fir_data.cpp

#include <systemc.h>
#include "fir_data.h"

void fir_data::entry()
{
  int state;
  sc_int<8> sample_tmp;

  // reset functionality
  if(reset.read()==true) {
    sample_tmp   = 0;
    acc = 0;
    for (int i=0; i<=15; i++) 
      shift[i] = 0;
  }

  // default settings
  result.write(0); 
  output_data_ready.write(false);
  state = state_out.read();
#ifdef DEBUG
  // cout << "Data debug : " << " " << state << " " << acc << " " << " at time " << sc_time_stamp() << endl;
  cout << "Data debug : " << " " << state << " " << acc << " " << " at time " << sc_time_stamp().to_double() << endl;
  for(int i=15; i>=0; i--) {
    cout << "Data debug : shift(" << i << ") " << shift[i] << endl;
  }; 
#endif

  // cycle behavior could be as well a case statement
  switch (state) {
  case 1 :
    sample_tmp = sample.read();
    acc = sample_tmp*coefs[0];
    acc += shift[14]* coefs[15];
    acc += shift[13]*coefs[14];
    acc += shift[12]*coefs[13];
    acc += shift[11]*coefs[12];
    break; 
  case 2 : 
    acc += shift[10]*coefs[11];
    acc += shift[9]*coefs[10];
    acc += shift[8]*coefs[9];
    acc += shift[7]*coefs[8];
    break; 
  case 3 : 
    acc += shift[6]*coefs[7];
    acc += shift[5]*coefs[6];
    acc += shift[4]*coefs[5];
    acc += shift[3]*coefs[4];
    break; 
  case 4 : 
    acc += shift[2]*coefs[3];
    acc += shift[1]*coefs[2];
    acc += shift[0]*coefs[1];
    for(int i=14; i>=0; i--) {
      shift[i+1] = shift[i];
    }; 
    shift[0] = sample.read();
    result.write((int)acc); 
    output_data_ready.write(true);
    break;
  default :
    cout << "Information : Reset state" << endl;
  }
} 


void fir_data::sample_DyPW(){

  if(reset.read()){
   sample_ptr.SetSignalDef("sample",0,0,IN);  
  cur_sample=0; pre_sample=0; } 
   
    cur_sample = sample.read();
 
    sample_ptr.UpdateSignalDef("sample",pre_sample,cur_sample,IN);
   int c = sample_ptr.CalDymPower("sample");
   
   cout <<"sample cur counts::\t"<< c << endl; 
   pre_sample = cur_sample; 
  
}

Results: Display : -16 at time 33000 Stimuli : 3 at time 39000 sample cur counts:: 1 Display : -13 at time 43000 Stimuli : 4 at time 49000 sample cur counts:: 3 Display : 6 at time 53000 Stimuli : 5 at time 59000 sample cur counts:: 1 最後把 cur counts 加總, 就可以算得 total counts