public void BusDecoderAnd_DecodeAnd_OutputActiveWhenEnabled()
{
const byte Value = 0x10;
var decoder = new BusDecoder("decoder");
decoder.AddValue(Value);
decoder.Input.ConnectTo(new Bus <BusData8>("bus"));
var busInput = decoder.Input.CreateConnection();
busInput.IsEnabled = true;
var and = new AndGate()
{
Name = "and"
};
and.AddInput().ConnectTo(decoder.Output);
var enable = and.AddInput().CreateConnection();
var output = and.Output.CreateConnection();
busInput.Write(new BusData8(Value));
decoder.Output.Level.Should().Be(DigitalLevel.High);
output.DigitalSignal.Level.Should().Be(DigitalLevel.Low);
enable.Write(DigitalLevel.High);
output.DigitalSignal.Level.Should().Be(DigitalLevel.High);
}
public void Decode_MatchingValue_OutputHigh()
{
_uut.AddValue(Value);
var value = NewValue(Value);
_input.Write(value);
_uut.Output.Level.Should().Be(DigitalLevel.High);
}
public void BusDecoderInvertorOr_DecodeOr_OutputActiveWhenEnabled()
{
const byte Value = 0x10;
var decoder = new BusDecoder("decoder");
decoder.AddValue(Value);
decoder.Input.ConnectTo(new Bus <BusData8>("bus"));
var busInput = decoder.Input.CreateConnection();
busInput.IsEnabled = true;
var invertor = new InvertorGate()
{
Name = "inv"
};
invertor.Input.ConnectTo(decoder.Output);
var or = new OrGate()
{
Name = "or"
};
or.AddInput().ConnectTo(invertor.Output);
var enable = or.AddInput().CreateConnection();
enable.Write(DigitalLevel.High);
var output = or.Output.CreateConnection();
busInput.Write(new BusData8(Value));
decoder.Output.Level.Should().Be(DigitalLevel.High);
invertor.Output.Level.Should().Be(DigitalLevel.Low);
output.DigitalSignal.Level.Should().Be(DigitalLevel.High);
enable.Write(DigitalLevel.Low);
output.DigitalSignal.Level.Should().Be(DigitalLevel.Low);
}
public InputPort AddInputPort(Bus address, Bus data, ushort ioAddress, string name = null)
{
if (name == null)
{
name = string.Empty;
}
var decoder = new BusDecoder(address, name + "-InputAddressDecoder");
decoder.AddValue(ioAddress);
AddComponent(decoder);
var invertor = new InvertorGate()
{
Name = name + "-InAddressDecodeInvertor"
};
AddComponent(invertor);
decoder.Output.ConnectTo(invertor.Input);
var or = new OrGate()
{
Name = name + "-InPortEnableIO"
};
or.AddInput().ConnectTo(Model.Cpu.IoRequest);
or.AddInput().ConnectTo(Model.Cpu.Read);
or.AddInput().ConnectTo(invertor.Output);
AddComponent(or);
var inputPort = new InputPort(data, name);
AddInputPort(inputPort);
inputPort.PortEnable.ConnectTo(or.Output);
return(inputPort);
}