Logic gate level. Part 4: combinational devices. K-maps & don’t care conditions. It isn’t always necessary to process all possible input combinations, since some are never expected to be present
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Part 4: combinational devices
(x,y,z) + d(a,b) where x,y,z,a and b all represent lines in the function’s truth table
Combination of control line
(s0-s2) inputs determines which of 8 data lines (d0-d7) is expressed as output value
By chaining together several of these constructs, we can build adders for multiple-digit numbers
ab + a’b’