Unformatted text preview: Unsigned + overflow Signed +/— overflow Negate b overflow input1 input2 inputs -> controlo Multiplexer
4 controh output 0 '
00 = unsigned addition
01 = signed addition
10 = signed subtraction
11 = negate b (ignore a) This circuit illustrates the use of a multiplexer by computing an
"overflow" bit for four types of operations an adder may have been
used to perform, and then selecting the correct overflow bit
(according to the value of the two control bits coming into the
multiplexer from the left). ...
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- Spring '08