private static void InstructionDecodeAndRegisterFetch(int pc, out string instruction, out string control, out string selected)
{
InstructionMem.Fill(new string[] { "00111101000010011111111111111111" });
instruction = InstructionMem.GetInstruction(pc);
control = ControlUnit.SetInput(instruction.Substring(0, 6), instruction.Substring(26, 6));
Register.SetData(instruction.Substring(6, 5), instruction.Substring(11, 5));
a4to1 = new Mux(new string[] { instruction.Substring(11, 5), instruction.Substring(16, 5), Convert.ToString(31, 2), "" })
{
select = control.Substring(0, 2)
};
selected = a4to1.Selected();
}
private static string MemoryAccess(string control, string result) //add pc so i can jump and link
{
Datamem.writeEHB = control.Substring(14, 5).Replace("_", ""); //Write enable, half and byte
Datamem.DataIn(result, Register.data2); //perform operation
string data = Extender.Extend(Datamem.DataOut(result).Substring(16, 16), control.Substring(20, 3));
m4to1 = new Mux(new String[] { Datamem.DataOut(result), data, result })
{
select = control.Substring(26, 2)
};
return(m4to1.Selected());
}
private static string AddressCalc(string instruction, string control)
{
c2to1 = new Mux(new String[] { Register.data1, instruction.Substring(6, 5) });
d2to1 = new Mux(new String[] { Register.data2, Extender.Extend(instruction.Substring(16, 16), control.Substring(20, 1) + "0") });
string selection = control.Substring(4, 4).Replace("_", "");
c2to1.select = selection[0].ToString();
d2to1.select = selection[1].ToString();
string result = ALU.Result(c2to1.Selected(), d2to1.Selected(), control.Substring(9, 4));
return(result);
}
