protected override void ExecuteSpecialFunction1(MicroInstruction instruction)
{
EthernetF1 ef1 = (EthernetF1)instruction.F1;
switch (ef1)
{
case EthernetF1.EILFCT:
// Nothing; handled in Early handler.
break;
case EthernetF1.EPFCT:
// Post Function. Gates interface status to BUS[8-15]. Resets the interface at
// the end of the cycle and removes wakeup for this task.
_busData &= _ethernetController.Status;
_ethernetController.ResetInterface();
_wakeup = false;
Log.Write(LogComponent.EthernetController, "EPFCT: Status {0}, bus now {1}",
Conversion.ToOctal(_ethernetController.Status),
Conversion.ToOctal(_busData));
break;
case EthernetF1.EWFCT:
// Countdown Wakeup Function. Sets a flip flop in the interface that will
// cause a wakeup to the Ether task on the next tick of SWAKMRT. This
// function must be issued in the instruction after a TASK. The resulting
// wakeup is cleared when the Ether task next runs.
Log.Write(LogComponent.EthernetController, "Enabling countdown wakeups.");
_ethernetController.CountdownWakeup = true;
break;
default:
throw new NotImplementedException(String.Format("Unimplemented Ethernet F1 {0}", ef1));
}
}
protected override void ExecuteSpecialFunction1Early(MicroInstruction instruction)
{
EthernetF1 ef1 = (EthernetF1)instruction.F1;
switch (ef1)
{
case EthernetF1.EILFCT:
// Early: Input Look Function. Gates the contents of the FIFO to BUS[0-15] but does
// not increment the read pointer.
_busData &= _ethernetController.ReadInputFifo(true /* do not increment read pointer */);
break;
}
}
