private void WriteBack()
{
if (PipelineRegistersList.MEMWB.Count == 0)
{
foreach (DataGridViewRow row in PipelineRegistersDataGridView.Rows)
{
if (row.Cells["Register"].Value.ToString() != "MEM/WB")
{
continue;
}
PipelineRegistersDataGridView[1, row.Index].Value = "-";
return;
}
}
var opCode = PipelineRegistersList.MEMWB.Dequeue();
ControlUnit.SetAluControls(opCode.ToString());
Muxs.MemToRegMux = new uint[2];
Muxs.MemToRegMux[1] = uint.Parse(PipelineRegistersList.MEMWB.Dequeue().ToString());
Muxs.MemToRegMux[0] = uint.Parse(PipelineRegistersList.MEMWB.Dequeue().ToString());
RegisterFile.WriteData = Muxs.GetMemToRegMuxVal(ControlUnit.MemToReg);
RegisterFile.WriteRegister = uint.Parse(PipelineRegistersList.MEMWB.Dequeue().ToString());
if (ControlUnit.RegWrite != 1)
{
return;
}
{
RegisterFile.PerformRegisterWrite();
foreach (DataGridViewRow row in MipsRegistersDataGrid.Rows)
{
if (row.Cells["Register"].Value.ToString() != string.Concat("$", RegisterFile.WriteRegister.ToString()))
{
continue;
}
MipsRegistersDataGrid[1, row.Index].Value = RegisterFile.WriteData;
var dt = (DataTable)MipsRegistersDataGrid.DataSource;
MipsRegisters = GetDict(dt);
break;
}
}
}
private void Decode()
{
if (PipelineRegistersList.IFID.Count == 0)
{
foreach (DataGridViewRow row in PipelineRegistersDataGridView.Rows)
{
if (row.Cells["Register"].Value.ToString() != "IF/ID")
{
continue;
}
PipelineRegistersDataGridView[1, row.Index].Value = "-";
return;
}
}
// Take instruction from IF/ID
var currentInstruction = PipelineRegistersList.IFID.Dequeue();
// Remove extra spaces, commas, initial PC
var instructionFormat = currentInstruction.ToString().Substring(6).Replace(" ", "");
var instructionOpCode = instructionFormat.Substring(0, 6);
ControlUnit.SetAluControls(instructionOpCode);
RegisterFile.ReadRegisterOne = Convert.ToUInt32(instructionFormat.Substring(6, 5), 2);
RegisterFile.ReadRegisterTwo = Convert.ToUInt32(instructionFormat.Substring(11, 5), 2);
// Read Data for given Register Addresses
RegisterFile.ReadData1();
RegisterFile.ReadData2();
// Enqueue in ID/EX
// Store opCode
PipelineRegistersList.IDEX.Enqueue(instructionOpCode);
// Store rs, rt
PipelineRegistersList.IDEX.Enqueue(RegisterFile.ReadDataOne);
PipelineRegistersList.IDEX.Enqueue(RegisterFile.ReadDataTwo);
var address = Convert.ToUInt32(instructionFormat.Substring(16, 16), 2);
// Store Sign Extension
PipelineRegistersList.IDEX.Enqueue(address);
// Store rt
PipelineRegistersList.IDEX.Enqueue(RegisterFile.ReadRegisterTwo);
// Store rd
PipelineRegistersList.IDEX.Enqueue(Convert.ToUInt32(instructionFormat.Substring(16, 5), 2));
var func = instructionFormat.Substring(26, 6);
var arr = func.ToCharArray();
Array.Reverse(arr);
func = new string(arr);
ALUControlBlock.Function = func;
// Add to DataGridView
foreach (DataGridViewRow row in PipelineRegistersDataGridView.Rows)
{
if (row.Cells["Register"].Value.ToString() != "ID/EX")
{
continue;
}
PipelineRegistersDataGridView[1, row.Index].Value = string.Concat(
RegisterFile.ReadDataOne.ToString(), "\n",
RegisterFile.ReadDataTwo, "\n",
address.ToString(), "\n",
RegisterFile.ReadRegisterTwo.ToString(), "\n",
Convert.ToUInt32(instructionFormat.Substring(16, 5), 2).ToString());
break;
}
ALUControlBlock.AluOp = ControlUnit.AluOp0 + ControlUnit.AluOp1.ToString();
}
