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bus splitter is able to transfer high-z states

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hneemann 2020-11-18 08:06:32 +01:00
parent 4e8fc4d72e
commit 6acf49138d
1 changed files with 10 additions and 2 deletions
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12
src/main/java/de/neemann/digital/core/wiring/BusSplitter.java
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@ -37,6 +37,7 @@ public class BusSplitter extends Node implements Element {
private ObservableValue commonIn;
private boolean oe;
private long commonD;
private long commonZ;
private ObservableValues outputValues;
/**
@ -77,12 +78,16 @@ public class BusSplitter extends Node implements Element {
oe = oeValue.getBool();
if (oe) {
commonD = commonIn.getValue();
commonZ = commonIn.getHighZ();
} else {
commonD = 0;
commonZ = 0;
long mask = 1;
for (int i = 0; i < bits; i++) {
if (in[i].getBool())
commonD |= mask;
if (in[i].isHighZ())
commonZ |= mask;
mask <<= 1;
}
}
@ -94,13 +99,16 @@ public class BusSplitter extends Node implements Element {
commonOut.setToHighZ();
long mask = 1;
for (int i = 0; i < bits; i++) {
out[i].setBool((commonD & mask) != 0);
if ((commonZ & mask) != 0)
out[i].setToHighZ();
else
out[i].setBool((commonD & mask) != 0);
mask <<= 1;
}
} else {
for (int i = 0; i < bits; i++)
out[i].setToHighZ();
commonOut.setValue(commonD);
commonOut.set(commonD, commonZ);
}
}