regfile.cpp

#include "regfile.h"

/**
 * instantiates the 32 registers %and initializes values to 0.
 */
void regfile::init_regs()
{
    memory.clear();
    for(int i=0;i<32;i++) memory.push_back(0);
}

/**
 * Used for debugging.
 */
void regfile::dump()
{
    for(int i=0;i<16;i++) printf(" r%2d",i);
    printf("\n");
    for(int i=0;i<16;i++) printf("%4d",(int)memory[i]);
    printf("\n");
    for(int i=0;i<16;i++) printf(" r%2d",i+16);
    printf("\n");
    for(int i=0;i<16;i++) printf("%4d",(int)memory[i+16]);
    printf("\n");
}

/**
 * Callback for behaviour of \c regfile module.
 */
void regfile::regfile_access()
{
   if(reset.read() == true) {
      init_regs();
      data1.write(0);
      data2.write(0);
      s_reg1 = 0;
      s_reg2 = 0;
   }
   else {
      if(clk.event() && clk.read()==1 && wr.read()) {
         if(regwrite.read() < 32 && regwrite.read() > 0) {
            memory[regwrite.read()] = datawr.read();
         }
      }
      if(clk.event() && clk.read()==1 && enable.read() == true) {
         if(reg1.read() < 32)
            s_reg1 = reg1.read();
         if(reg2.read() < 32)
            s_reg2 = reg2.read();
      }
      data1.write(memory[s_reg1.read()]);
      data2.write(memory[s_reg2.read()]);
   }
}