public void Write_SetAddressAndDataFirst_ReadBackCorrectValue()
{
var mem = MemoryTestExtensions.NewRam(new byte[] { 0x00 });
var addressBus = mem.Address.CreateConnection();
var dataBus = mem.Data.CreateConnection();
var wrDataBus = new BusMaster <BusData8>(dataBus.Bus, null);
var ceProv = mem.ChipEnable.CreateConnection();
var oeProv = mem.OutputEnable.CreateConnection();
var weProv = mem.WriteEnable.CreateConnection();
// set address
addressBus.IsEnabled = true;
addressBus.Write(new BusData16(0));
// write data
wrDataBus.IsEnabled = true;
wrDataBus.Write(new BusData8(Value));
// enable chip and input
ceProv.Write(DigitalLevel.Low);
weProv.Write(DigitalLevel.Low);
// value is stored here
weProv.Write(DigitalLevel.High);
wrDataBus.IsEnabled = false;
oeProv.Write(DigitalLevel.Low);
dataBus.Value.Equals(new BusData8(Value)).Should().BeTrue();
}
public void Write_AddressBus_NoErrors()
{
var mem = MemoryTestExtensions.NewRom(new byte[] { Value });
var addressBus = mem.Address.CreateConnection();
addressBus.IsEnabled = true;
addressBus.Write(new BusData16(0));
}
public void Write_DigitalSignals_NoErrors()
{
var mem = MemoryTestExtensions.NewRom(new byte[] { Value });
var ceProv = mem.ChipEnable.CreateConnection();
var oeProv = mem.OutputEnable.CreateConnection();
ceProv.Write(DigitalLevel.Low);
oeProv.Write(DigitalLevel.Low);
}
public void Enable_OutputAndWrite_Throws()
{
var mem = MemoryTestExtensions.NewRam(new byte[] { 0x00 });
var dataBus = mem.Data.CreateConnection();
var ceProv = mem.ChipEnable.CreateConnection();
var oeProv = mem.OutputEnable.CreateConnection();
var weProv = mem.WriteEnable.CreateConnection();
ceProv.Write(DigitalLevel.Low);
weProv.Write(DigitalLevel.Low);
Action test = () => oeProv.Write(DigitalLevel.Low);
test.ShouldThrow <InvalidOperationException>();
}
public void Read_NextAddress_CorrectValue()
{
var mem = MemoryTestExtensions.NewRom(new byte[] { 0, Value });
var addressBus = mem.Address.CreateConnection();
var dataBus = mem.Data.CreateConnection();
var ceProv = mem.ChipEnable.CreateConnection();
var oeProv = mem.OutputEnable.CreateConnection();
// enable chip and output
ceProv.Write(DigitalLevel.Low);
oeProv.Write(DigitalLevel.Low);
// set address
addressBus.IsEnabled = true;
addressBus.Write(new BusData16(1));
// read data
dataBus.Value.Equals(new BusData8(Value)).Should().BeTrue();
}
public void DisableAfterRead_DataBus_IsFloating()
{
var mem = MemoryTestExtensions.NewRom(new byte[] { Value });
var ceProv = mem.ChipEnable.CreateConnection();
var oeProv = mem.OutputEnable.CreateConnection();
var addressBus = mem.Address.CreateConnection();
var dataBus = mem.Data.CreateConnection();
ceProv.Write(DigitalLevel.Low);
oeProv.Write(DigitalLevel.Low);
addressBus.IsEnabled = true;
addressBus.Write(new BusData16(0));
// disable
oeProv.Write(DigitalLevel.High);
dataBus.Value.IsFloating.Should().Be(true);
}
public void Read_Inactive_NoValue()
{
var mem = MemoryTestExtensions.NewRom(new byte[] { Value });
var addressBus = mem.Address.CreateConnection();
var dataBus = mem.Data.CreateConnection();
var ceProv = mem.ChipEnable.CreateConnection();
var oeProv = mem.OutputEnable.CreateConnection();
// do not enable chip
ceProv.Write(DigitalLevel.High);
oeProv.Write(DigitalLevel.Low);
// set address
addressBus.IsEnabled = true;
addressBus.Write(new BusData16(0));
// read data
dataBus.Value.Equals(new BusData8()).Should().BeTrue();
}
public void Write_Rom_Throws()
{
var mem = MemoryTestExtensions.NewRom(new byte[] { Value });
var addressBus = mem.Address.CreateConnection();
var dataBus = mem.Data.Slave.CreateConnection();
var ceProv = mem.ChipEnable.CreateConnection();
var oeProv = mem.OutputEnable.CreateConnection();
ceProv.Write(DigitalLevel.Low);
oeProv.Write(DigitalLevel.Low);
// set address
addressBus.IsEnabled = true;
addressBus.Write(new BusData16(0));
Action fn = () => dataBus.Write(new BusData8(0));
fn.ShouldThrow <InvalidOperationException>();
}
public void Initialize_NoErrors()
{
var mem = MemoryTestExtensions.NewRom(new byte[] { Value });
mem.Should().NotBeNull();
}
