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Carry Select Adder

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Topv5.crop.c

A carry-select adder takes the two input bits A and B and creates a true and partial sum from them. These go into a multiplexer which choses the correct output based on the actual carry in. Carry-select adders are made by linking 2 adders together, one being fed a constant 0-carry, the other a constant 1-carry. Most Minecraftian carry-select adders are not true carry-select adders, but simulate the operation of a carry-select in Minecraft.

Truth tablesEdit

(carry-select simulating)

Pre-multiplexer:Edit

Inputs Outputs
A B S C Spartial Cpartial
0 0 0 0 1 0
1 0 1 0 0 1
0 1 1 0 0 1
1 1 0 1 1 0

Multiplexer:Edit

Inputs Outputs
S C Spartial Cpartial Cin S C
0 0 1 0 0 0 0
1 0 0 1 0 1 0
0 1 1 0 0 0 1
0 0 1 0 1 1 0
1 0 0 1 1 0 1
0 1 1 0 1 1 1

External LinksEdit

A "Carry-Select" Adder

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