// *************************************************************************
// *************************************************************************
// Engine Runtime
// *************************************************************************
public void Run()
{
Clock clock = new Clock();
TicTok tictok = new TicTok();
tictok.Init();
AReg areg = new AReg();
TReg treg = new TReg();
BReg breg = new BReg();
CReg creg = new CReg();
IReg ireg = new IReg();
IPort1 iport1 = new IPort1();
IPort2 iport2 = new IPort2();
MDR mdr = new MDR();
RAM ram = new RAM();
mdr.SetRefToRAM(ref ram);
ALU alu = new ALU(ref areg, ref treg);
areg.SetALUReference(ref alu);
breg.SetALUReference(ref alu);
creg.SetALUReference(ref alu);
OReg3 oreg3 = new OReg3(ref alu);
OReg4 oreg4 = new OReg4(ref alu);
HexadecimalDisplay hexadecimalDisplay = new HexadecimalDisplay(ref oreg3);
Flag flagReg = new Flag(ref alu);
PC pc = new PC(ref flagReg);
MAR mar = new MAR(ref ram);
SEQ seq = SEQ.Instance();
Wbus.Instance().Value = string.Concat(Enumerable.Repeat('0', 16));
areg.Subscribe(clock);
treg.Subscribe(clock);
breg.Subscribe(clock);
creg.Subscribe(clock);
ireg.Subscribe(clock);
mar.Subscribe(clock);
pc.Subscribe(clock);
alu.Subscribe(clock); // ALU must come after A and T
flagReg.Subscribe(clock);
ram.Subscribe(clock);
mdr.Subscribe(clock);
oreg3.Subscribe(clock);
hexadecimalDisplay.Subscribe(clock);
oreg4.Subscribe(clock);
// Load the program into the RAM
ram.LoadProgram(Program);
// Load the intsructionSet into the SEQ
seq.Load(InstructionSet);
Frame tempFrame;
#region Program_Exec
// Since T1-T3 for all of the Intruction is the same,
// LDA or "0000" will be used as the intruction for all T1-T3's
clock.IsEnabled = true;
int max_loop_count = 10_000;
int loop_counter = 0;
int TState = 1;
// A basic empty instruction state with 3 TStates since on the 4th the instruction
// will be known and set to a new object reference.
Instruction currentInstruction = new Instruction()
{
OpCode = "???",
TStates = 4 // Since by 4 TStates it should know what instruction it is on
};
List <string> controlWords = new List <string>();
bool? didntJump = null;
while (clock.IsEnabled)
{
// Log the Instruction
if (TState == 4)
{
currentInstruction = InstructionSet.Instructions.FirstOrDefault(i => i.BinCode.Equals(ireg.RegContent));
seq.LoadBackupControlWords(currentInstruction.MicroCode);
string iname = currentInstruction.OpCode;
int operandVal = Convert.ToInt32(ireg.RegContent, 2);
string hexOperand = "0x" + operandVal.ToString("X");
}
if (TState <= 3)
{
seq.UpdateControlWordReg(TState, "00000000", didntJump);
if (didntJump ?? false)
{
pc.SkipByte();
didntJump = null;
}
}
else
{
seq.UpdateControlWordReg(TState, ireg.RegContent);
}
clock.SendTicTok(tictok);
tictok.ToggleClockState();
clock.SendTicTok(tictok);
tictok.ToggleClockState();
tempFrame = new Frame(currentInstruction, TState, iport1, iport2, pc, mar, ram,
ram.RAMDump(), mdr, ireg, SEQ.Instance(),
Wbus.Instance().Value, areg, alu, flagReg,
treg, breg, creg, oreg3, oreg4, hexadecimalDisplay);
_FrameStack.Add(tempFrame);
// HLT
if (ireg.RegContent.Equals("01110110", StringComparison.Ordinal) && TState == 5)
{
clock.IsEnabled = false;
_RAMDump = ram.RAMDump();
}
if (loop_counter >= max_loop_count)
{
throw new EngineRuntimeException("Engine Error: Infinite Loop Detected");
}
else
{
loop_counter++;
}
if (TState == 7 && currentInstruction.OpCode.StartsWith('J'))
{
pc.CheckForJumpCondition();
// PC is going to jump so do not let it fetch the next byte and immediately endx
if (!pc.WontJump)
{
currentInstruction.TStates = 7;
didntJump = true;
}
}
if (TState < currentInstruction.TStates)
{
TState++;
}
else
{
TState = 1;
currentInstruction = new Instruction()
{
OpCode = "???",
TStates = 4 // Since by 4 TStates it should know what instruction it is on
};
}
}
OutputReg = oreg3.ToString();
#endregion Program_Exec
}