syntax for copying the bit vector , systemC 2.3.1 version

[Rashmi11]

Hi All ,

I am trying to copy a particular bit  from one bit vector to other . I tried several ways of assigning the values but could not get it right. Also ,I want to assign a variable 'i' to a constant value in the loop . Below is the code . I have highlighted the lines where I am getting error. I would really appreciate if anyone could help in this . Thank you. 

 

#include "systemc.h"

SC_MODULE(S_R){

sc_in <bool> clk;

sc_in < sc_bv<8> > din;

sc_in <bool> rst;

sc_out< sc_bv<8> > dout;

sc_in<bool> load;

 

sc_bv<8> dinp;

sc_int<1> i ;

 

 

void shift()

{

if(rst)

{

dout=0;

}

else if(load)

{

dinp=din;

i.write('0');

dout[0].write(dinp[7]);

cout<<sc_time_stamp()<<"\tDESIGN1 --> input data:"<<dinp<<"\toutput data:"<<dout<<"\n";

}

else

{

dinp=dinp<<1;

dout.write(dinp[7]);

i=i+1;

cout<<sc_time_stamp()<<"\tDESIGN --> input data:"<<dinp<<"\toutput data:"<<dout<<"\n";

 

}

 

}

 

 

SC_CTOR(S_R)

{

SC_METHOD(shift);

sensitive<<clk.pos();

 

}

 

};

 

[apfitch]

Hi, the trick to understanding this is to notice the difference between

 

sc_in < bool > dout [8]; // an array of 8 boolean ports

 

and

 

sc_in<sc_bv<8> > dout; // a single port containing an 8 bit vector.

 

So you need to get at the 8 bit value within dout.

 

The easiest way round it is probably

 

sc_bv<8> dout_temp = dout.read();

dout_temp[0] = dinp.read()[7];

dout.write(dout_temp);

 

For the use of sc_int<1>, sc_int is not a signal, therefore does not have a write() method.

 

Just do

i = 0;

 

 

Generally if you're going to do code like you've shown above, I would recommend using temporary variables, then assigning the variables to the ports - or even easier, just use VHDL or Verilog :-)

 

regards

Alan

[dakupoto]

 

Hi All ,

I am trying to copy a particular bit  from one bit vector to other . I tried several ways of assigning the values but could not get it right. Also ,I want to assign a variable 'i' to a constant value in the loop . Below is the code . I have highlighted the lines where I am getting error. I would really appreciate if anyone could help in this . Thank you. 

 

#include "systemc.h"

SC_MODULE(S_R){

sc_in <bool> clk;

sc_in < sc_bv<8> > din;

sc_in <bool> rst;

sc_out< sc_bv<8> > dout;

sc_in<bool> load;

 

sc_bv<8> dinp;

sc_int<1> i ;

 

 

void shift()

{

if(rst)

{

dout=0;

}

else if(load)

{

dinp=din;

i.write('0');

dout[0].write(dinp[7]);

cout<<sc_time_stamp()<<"\tDESIGN1 --> input data:"<<dinp<<"\toutput data:"<<dout<<"\n";

}

else

{

dinp=dinp<<1;

dout.write(dinp[7]);

i=i+1;

cout<<sc_time_stamp()<<"\tDESIGN --> input data:"<<dinp<<"\toutput data:"<<dout<<"\n";

 

}

 

}

 

 

SC_CTOR(S_R)

{

SC_METHOD(shift);

sensitive<<clk.pos();

 

}

 

};

Hello,

 A bit vector is a C++ RTL vector. So, have you looked into the possibility

of using a copy constructor ? I am sure the basic C++ STL vector supports

a cop constructor, so this ought to work.

[Rashmi11]

Thank you both..