DMux4Way. Slept over it, and got it immediately on first try
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@ -23,5 +23,5 @@ Build order as per the website. Cost for each gate in NAND in brackets.
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- [x] `Or8Way` (21)
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- [x] `Mux4Way16` (339)
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- [x] `Mux8Way16` (791)
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- [ ] `DMux4Way` ()
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- [x] `DMux4Way` (37, Fun)
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- [ ] `DMux8Way` ()
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@ -16,5 +16,28 @@ CHIP DMux4Way {
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OUT a, b, c, d;
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PARTS:
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// Put your code here:
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}
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/**
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* Demultiplexor:
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* {x, y} = {in, 0} if sel[0] == 0
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* {0, in} if sel[0] == 1
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*/
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DMux(in=in, sel=sel[0], a=x, b=y);
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// Now we can copy x,y to abcd as {x|0,y|0,x|0,y|0}
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// depending on sel[1]
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// sel| 00 | 01 || 10 | 11
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//S[1]| 0 || 1
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//----|----|----||----|---
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// x | in | 0 || in | 0
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// y | 0 | in || 0 | in
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//----|----|----||----|---
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// a | in | 0 || 0 | 0
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// b | 0 | in || 0 | 0
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// c | 0 | 0 || in | 0
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// d | 0 | 0 || 0 | in
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Mux(a=x, b=false, sel=sel[1], out=a);
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Mux(a=y, b=false, sel=sel[1], out=b);
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Mux(a=false, b=x, sel=sel[1], out=c);
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Mux(a=false, b=y, sel=sel[1], out=d);
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}
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@ -0,0 +1,9 @@
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| in | sel | a | b | c | d |
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| 0 | 00 | 0 | 0 | 0 | 0 |
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| 0 | 01 | 0 | 0 | 0 | 0 |
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| 0 | 10 | 0 | 0 | 0 | 0 |
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| 0 | 11 | 0 | 0 | 0 | 0 |
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| 1 | 00 | 1 | 0 | 0 | 0 |
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| 1 | 01 | 0 | 1 | 0 | 0 |
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| 1 | 10 | 0 | 0 | 1 | 0 |
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| 1 | 11 | 0 | 0 | 0 | 1 |
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