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Add unit test for SR latch NAND circuit

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Stone_Red
2026-03-26 22:29:10 +01:00
parent 9fc1121998
commit 2849bc162a
1 changed files with 57 additions and 0 deletions
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StoneRed.LogicSimulator.Tests/AdvancedCircuitTests.cs
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@@ -139,6 +139,63 @@ public abstract class AdvancedCircuitTestsBase
Check(true, true, true, true, true); Check(true, true, true, true, true);
} }
[TestMethod]
public void TestSRLatchNand()
{
// SR Latch using NAND gates
// Q = NAND(S', Q')
// Q' = NAND(R', Q)
// Note: S' and R' are active-low (inverted) inputs
ICircuitSimulator sim = CreateSimulator();
int s = sim.AddGate(GateKind.Source);
int r = sim.AddGate(GateKind.Source);
int andQ = sim.AddGate(GateKind.And2);
int nandQ = sim.AddGate(GateKind.Not); // Q
int andQNot = sim.AddGate(GateKind.And2);
int nandQNot = sim.AddGate(GateKind.Not); // Q'
// Q = NAND(S, Q')
sim.ConnectGates(s, andQ, 0);
sim.ConnectGates(nandQNot, andQ, 1);
sim.ConnectGates(andQ, nandQ, 0);
// Q' = NAND(R, Q)
sim.ConnectGates(r, andQNot, 0);
sim.ConnectGates(nandQ, andQNot, 1);
sim.ConnectGates(andQNot, nandQNot, 0);
int qSink = sim.AddGate(GateKind.Sink);
int qNotSink = sim.AddGate(GateKind.Sink);
sim.ConnectGates(nandQ, qSink, 0);
sim.ConnectGates(nandQNot, qNotSink, 0);
// Set state (S'=0, R'=1) -> Q=1, Q'=0
sim.SetSource(s, false);
sim.SetSource(r, true);
_ = sim.RunUntilStable(10000);
Assert.IsTrue(sim.GetOutput(qSink), "Q should be 1 after Set (S'=0)");
Assert.IsFalse(sim.GetOutput(qNotSink), "Q' should be 0 after Set (S'=0)");
// Hold (S'=1, R'=1) -> Q=1
sim.SetSource(s, true);
_ = sim.RunUntilStable(10000);
Assert.IsTrue(sim.GetOutput(qSink), "Q should stay 1");
// Reset state (S'=1, R'=0) -> Q=0, Q'=1
sim.SetSource(r, false);
_ = sim.RunUntilStable(10000);
Assert.IsFalse(sim.GetOutput(qSink), "Q should be 0 after Reset (R'=0)");
Assert.IsTrue(sim.GetOutput(qNotSink), "Q' should be 1 after Reset (R'=0)");
// Hold (S'=1, R'=1) -> Q=0
sim.SetSource(r, true);
_ = sim.RunUntilStable(10000);
Assert.IsFalse(sim.GetOutput(qSink), "Q should stay 0");
}
[TestMethod] [TestMethod]
public void TestDLatch() public void TestDLatch()
{ {