cache_memif.h

国外开源的一个片上网络系统的源代码

/*
 *  TU Eindhoven
 *  Eindhoven, The Netherlands
 *
 *  Name            :   cache_memif.h
 *
 *  Author          :   [e-mail]
 *
 *  Date            :   
 *
 *  Function        :   Cache interface to the main memory (behavioral)
 *
 *
 */

#ifndef CACHE_MEMIF_H_INCLUDED
#define CACHE_MEMIF_H_INCLUDED

#include "mips.h"
#include "xlxram.h"

SC_MODULE(CACHE_MEMIF)
{
  sc_int<32> memory[16384];

  sc_in< bool > clk;

  sc_in< sc_bv<32> > addr, din;
  sc_out< sc_bv<32> > dout;
  sc_in< bool > ww, wb, r;
  sc_out< bool > rdy;

  SC_CTOR(CACHE_MEMIF){
	SC_CTHREAD(thread,clk.pos());
  }
  
  void mem_init(const char *filename, int size){
	vector<sc_int<32>* > v(1, memory);
	init_memory( &v, size, filename);
  }
  void mem_dump(const char *filename, int size ){
	vector<sc_int<32>* > v(1, memory);
	dump_memory( &v, size, filename);
  }
  
  void thread(){
	
	sc_int<30> wa;
	sc_bv<32> a,d;
	bool _r, _ww, _wb;
	int rnd;
	
	while(true){

	  a = addr.read();
	  d = din.read();

	  // if( a.to_uint()>=RAMSIZE ) a=sc_bv<32>( a.to_uint()%RAMSIZE );
	  rdy.write(true); rnd = rand()%4;
	  // rdy.write(true); rnd = 0;
	  
	  
	  
	  _r = r.read(); _wb = wb.read(); _ww = ww.read();
	  if( _r || _ww || _wb )
		{
		  //cout << "mem req " << " a=" << hex << a.to_uint() << " d=" << d.to_uint() << dec << " " << sc_time_stamp() << endl;
		  while(rnd--) { 
			//cout << "mem wait " << " a=" << hex << a.to_uint() << " d=" << d.to_uint() << dec << " " << sc_time_stamp() << endl;
			rdy.write(false); 
			wait(); 
		  }
		  rdy.write(true);
		  
		  //cout << "mem rdy " << " a=" << hex << a.to_uint() << " d=" << d.to_uint() << dec << " " << sc_time_stamp() << endl;
		  wa = sc_uint<30>( sc_bv<30>(a.range(31,2)) );
		  if( _r )
			dout.write( sc_bv<32>(memory[wa]) );
		  if( _ww )
			memory[wa] = sc_int<32>(d);
		  if( _wb )
			{
			  sc_bv<32> nd(memory[wa]);
			  sc_uint<2> byte = sc_bv<2>(a.range(1,0));
			  switch(byte){
			  case 0 : nd.range(31,24) = d.range(7,0); break;
			  case 1 : nd.range(23,16) = d.range(7,0); break;
			  case 2 : nd.range(15,8) = d.range(7,0); break;
			  case 3 : nd.range(7,0) = d.range(7,0); break;
			  }
			  memory[wa] = sc_int<32>(nd);
			}
		}
	  
	  wait();
	}
  }
};

#endif