public List <Instance> TryTransform(Instance instance, TransformationContext context)
{
if (!instance.ModuleIdentifier.Contains("io_ibuf") &&
!instance.ModuleIdentifier.Contains("io_obuf"))
{
return(null);
}
var input = instance.Ports.First(p => p.Identifier == "i").ConnectedNet;
var output = instance.Ports.First(p => p.Identifier == "o").ConnectedNet;
var result = new List <Instance>();
var bufferInput = input;
if (instance.Ports.First(p => p.Identifier == "i").IsConnectedNetNegated)
{
var inverter = new Instance("INV", "inv_" + context.GetNextInstanceNumber(this));
inverter.Ports.Add(new Net("I", NetType.Input, new Net(input.Identifier, NetType.Wire)));
var inverterOutput = new Net("n_" + context.GetNextNetNumber(), NetType.Wire);
inverter.Ports.Add(new Net("O", NetType.Input, inverterOutput));
bufferInput = inverterOutput;
result.Add(inverter);
}
var buffer = new Instance("BUF", "buf_" + context.GetNextInstanceNumber(this));
buffer.Ports.Add(new Net("I", NetType.Input, bufferInput));
buffer.Ports.Add(new Net("O", NetType.Output, new Net(output.Identifier, NetType.Wire)));
result.Add(buffer);
return(result);
}
public List <Instance> TryTransform(Instance instance, TransformationContext context)
{
if (!instance.ModuleIdentifier.Contains("lcell_comb"))
{
return(null);
}
var lutMaskAsString = instance.Parameters.First(p => p.Identifier == "lut_mask").Value;
var lutMask = Tools.ParseVerilogNumber(lutMaskAsString);
var lutMaskAsBoolArray =
Convert.ToString(lutMask, 2)
.Select(c => c == '1')
.Reverse()
.ToArray();
var function = new bool[16];
for (var i = 0; i < lutMaskAsBoolArray.Length; i++)
{
function[i] = lutMaskAsBoolArray[i];
}
function = function.Reverse().ToArray();
var isConjunctive = function.Count(v => v == false) < function.Count(v => v == true);
var normalForm = GetNormalFormVariableRows(function, isConjunctive)
.Select(r => r.Reverse().ToArray()).ToArray();
var inversionNeeded = new bool[4];
foreach (var row in normalForm)
{
for (var j = 0; j < row.Length; j++)
{
inversionNeeded[j] = !(isConjunctive && row[j] || !isConjunctive && !row[j]) || inversionNeeded[j];
}
}
var result = new List <Instance>();
//var netIdenifiers = new[] {"datad", "datac", "datab", "dataa"};
var netIdenifiers = new[] { "dataa", "datab", "datac", "datad" };
for (var i = 0; i < inversionNeeded.Length; i++)
{
if (inversionNeeded[i])
{
var input = instance.Ports.First(x => x.Identifier == netIdenifiers[i]).ConnectedNet
.Identifier;
var element = new Instance("INV", "inv_" + input + context.GetNextInstanceNumber(this));
element.Ports.Add(new Net("I", NetType.Input, new Net(input, NetType.Wire)));
element.Ports.Add(new Net("O", NetType.Output,
new Net("n_" + context.GetNextNetNumber(), NetType.Wire)));
result.Add(element);
}
}
var currentLevelElements = new List <Instance>();
for (var i = 0; i < normalForm.Length; i++)
{
var instancePorts = new string[4];
for (var j = 0; j < 4; j++)
{
instancePorts[j] = instance.Ports.First(x => x.Identifier == netIdenifiers[j]).ConnectedNet.Identifier;
}
var element = isConjunctive ?
new Instance("OR4", "or4_" + context.GetNextInstanceNumber(this)) :
new Instance("AND4", "and4_" + context.GetNextInstanceNumber(this));
for (var j = 0; j < 4; j++)
{
if (!(normalForm[i][j] && isConjunctive || !normalForm[i][j] && !isConjunctive))
{
element.Ports.Add(new Net($"I{j}", NetType.Input,
result.First(e => e.Identifier.Contains(instancePorts[j]))
.Ports
.First(p => p.NetType == NetType.Output).ConnectedNet));
}
else
{
element.Ports.Add(new Net($"I{j}", NetType.Input,
new Net(instancePorts[j], NetType.Wire)));
}
}
element.Ports.Add(new Net("O", NetType.Output,
new Net(element.Identifier + "_" + context.GetNextNetNumber(), NetType.Wire)));
currentLevelElements.Add(element);
}
if (currentLevelElements.Count == 1)
{
result.AddRange(currentLevelElements);
}
while (currentLevelElements.Count != 1)
{
var nextLevelElements = new List <Instance>();
if (currentLevelElements.Count % 2 == 1)
{
nextLevelElements.Add(currentLevelElements.Last());
currentLevelElements.RemoveAt(currentLevelElements.Count - 1);
}
for (var i = 0; i < currentLevelElements.Count; i += 2)
{
var element = isConjunctive ?
new Instance("AND2", "and2_" + context.GetNextInstanceNumber(this)) :
new Instance("OR2", "or2_" + context.GetNextInstanceNumber(this));
element.Ports.Add(new Net("I0", NetType.Input,
currentLevelElements[i].Ports.First(p => p.NetType == NetType.Output).ConnectedNet));
element.Ports.Add(new Net("I1", NetType.Input,
currentLevelElements[i + 1].Ports.First(p => p.NetType == NetType.Output).ConnectedNet));
element.Ports.Add(new Net("O", NetType.Output, new Net("n_" + context.GetNextNetNumber(), NetType.Wire)));
nextLevelElements.Add(element);
}
result.AddRange(currentLevelElements);
//if (currentLevelElements.Count == 0) break;
currentLevelElements = new List <Instance>(nextLevelElements);
}
result.AddRange(currentLevelElements);
result.Last().Ports.First(p => p.Identifier == "O").ConnectedNet =
new Net(instance.Ports.First(p => p.Identifier == "combout").ConnectedNet.Identifier, NetType.Wire);
return(result);
}