public CpuReadParameterThenExecute(Die die)
: base(die, createInstruction: false)
{
// turn off refresh logic - not a true M1 cycle.
RefreshEnabled = false;
// read d-offset that comes before the opcode
_currentPart = new ReadT3InstructionPart(Die, MachineCycleNames.M1);
}
protected override void OnClockNeg()
{
base.OnClockNeg();
if (ExecutionEngine.Cycles.CycleName == CycleNames.T3 &&
ExecutionEngine.Cycles.MachineCycle == MachineCycleNames.M1)
{
if (!_opcodeWasRead)
{
// read instruction opcode
_currentPart = new ReadT3InstructionPart(Die, MachineCycleNames.M1);
ExecutionEngine.Cycles.Continue(5);
_opcodeWasRead = true;
}
else
{
// done reading opcode
_currentPart = null;
}
}
}
