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Romesh Rajoria

How to read or write a 256 bit binary?

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In this code I want

#include <systemc.h>
SC_MODULE (register_file)
{
  // sc_in <sc_unint<4> > dest_register; 
   sc_in<sc_uint <3 > source_reg_1;
   sc_in<sc_uint <3> > source_reg_2;
   sc_in<sc_uint <32> > instruction_in;
   
   sc_in <bool> write_enable;
   sc_in <sc_uint<3> > write_addr;
   sc_in <sc_uint<256> > write_data;  // data to be written
   sc_in <bool> clk;
   sc_in <bool> rst;
   sc_out <sc_uint<256> > ra; //read data port
   sc_out <sc_uint<256> > rb; // write data port
   sc_out <sc_uint<32> > instruction_out;
  // sc_out <sc_uint<4> > opcode;
   sc_in <bool> scalar_enable;
   //sc_uint<4> i;
  // sc_uint<4> j;
   //////////defining scalar memory///////
    sc_uint<256> scalar_reg[8];
////////internal variables///////
    sc_uint<3> ra_reg;
    sc_uint<3> rb_reg;
    sc_uint<3> write_addr_reg;
   // sc_uint<32> instruction_reg;
////// function to be present inside the register////
void register_1()
{
   while(1)
        {
            if(rst)
             {  
                ra.write(0);
                rb.write(0);
                instruction_out.write(0);
              //  opcode.write(0);
                     }
else 
{
 // instruction_reg = instruction_in.read();
 // opcode = instruction_reg.range(31,28);
    if ( write_enable)
        {
               write_addr_reg = write_addr.read();
               scalar_reg[write_addr_reg]= write_data.read();
 
     
         }
   
   else 
{
    ra_reg = source_reg_1.read();
    rb_reg = source_reg_2.read();
     
     scalar_reg[0] = 7561235462;
     scalar_reg[1] = 1;
     scalar_reg[2] = 2;
     scalar_reg[3] = 3;
     scalar_reg[4] = 4;
     scalar_reg[5] = 5;
     scalar_reg[6] = 6;
     scalar_reg[7] = 7;
     scalar_reg[8] = 8;
     scalar_reg[9] = 9;
     scalar_reg[10]= 10;
     scalar_reg[11]= 11;
     scalar_reg[12]= 12;
     scalar_reg[13]= 13;
     scalar_reg[14]= 14;
     scalar_reg[15]= 15;


      ra.write(scalar_reg[ra_reg]);
      rb.write(scalar_reg[rb_reg]);
      instruction_out.write(instruction_in);
}
}
  cout << " output_register_1" << ra << endl;
  cout << " output_register_2" << rb << endl;
  cout << " instruction" << instruction_out;
 // cout << "opcode_out" << opcode;
wait();
}
}
SC_CTOR (register_file)
{
      SC_CTHREAD ( register_1 , clk.pos() );
        }

};

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This is easy.

First, sc_int<N> and sc_uint<N> are limited to 64 bits. So you cannot use 256 there; however, you can use sc_bigint<N> and sc_biguint<N> for any value of N>64.

Second, you will need to specify constants as strings since C++ itself does not support >64 native numbers; although, you can use C++ user-defined literals to get around this limitation if using C++ 2011 or better.

 

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