simple_bus_fast_mem.h

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/*****************************************************************************
 
  simple_bus_fast_mem.h : The memory (slave) without wait states.
 
  Original Author: Ric Hilderink, Synopsys, Inc., 2001-10-11
 
 *****************************************************************************/
 
/*****************************************************************************
 
  MODIFICATION LOG - modifiers, enter your name, affiliation, date and
  changes you are making here.
 
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  Description of Modification:
 
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#ifndef __simple_bus_fast_mem_h
#define __simple_bus_fast_mem_h

#include <systemc.h>

#include "simple_bus_types.h"
#include "simple_bus_slave_if.h"


class simple_bus_fast_mem
  : public simple_bus_slave_if // the slave interface is implemented in the slave, used by the bus
  , public sc_module
{
public:
  // constructor
  simple_bus_fast_mem(sc_module_name name_
		      , unsigned int start_address
		      , unsigned int end_address)
    : sc_module(name_)
    , m_start_address(start_address)
    , m_end_address(end_address)
  {
    sc_assert(m_start_address <= m_end_address);
    sc_assert((m_end_address-m_start_address+1)%4 == 0);
    unsigned int size = (m_end_address-m_start_address+1)/4;
    MEM = new int [size]; // allocate memory
    for (unsigned int i = 0; i < size; ++i)
      MEM[i] = 0;
  }

  // destructor
  ~simple_bus_fast_mem();

  // direct Slave Interface
  bool direct_read(int *data, unsigned int address);
  bool direct_write(int *data, unsigned int address);

  // Slave Interface
  simple_bus_status read(int *data, unsigned int address);
  simple_bus_status write(int *data, unsigned int address);

  unsigned int start_address() const;
  unsigned int end_address() const;

private:
    /**the pointer of the array, i.e., the start address of the array*/
  int * MEM;
  unsigned int m_start_address;
  unsigned int m_end_address;

}; // end class simple_bus_fast_mem

inline bool simple_bus_fast_mem::direct_read(int *data, unsigned int address)
{
  return (read(data, address) == SIMPLE_BUS_OK);
}

inline bool simple_bus_fast_mem::direct_write(int *data, unsigned int address)
{
  return (write(data, address) == SIMPLE_BUS_OK);
}

inline simple_bus_status simple_bus_fast_mem::read(int *data
						   , unsigned int address)
{
  *data = MEM[(address - m_start_address)/4];
  return SIMPLE_BUS_OK;
}

inline simple_bus_status simple_bus_fast_mem::write(int *data
						    , unsigned int address)
{
  MEM[(address - m_start_address)/4] = *data;
  return SIMPLE_BUS_OK;
}

inline  simple_bus_fast_mem::~simple_bus_fast_mem()
{
  if (MEM) delete [] MEM;
  MEM = (int *)0;
}

inline unsigned int simple_bus_fast_mem::start_address() const
{
  return m_start_address;
}

inline unsigned int simple_bus_fast_mem::end_address() const
{
  return m_end_address;
}

#endif