CSE 241 Lecture Notes - Lecture 13: Integrated Circuit, Truth Table

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Combinational circuit (cc) n ______ cc _____ f() inputs output. Output is dependent only on the inputs for a given circuit cc synthesis: problem statement -> digital logic circuit. Given this circuit, derive the expression for o1 and o2. O2 = (cid:894)bc + de(cid:895)" = (cid:894)bc(cid:895)"(cid:894)de(cid:895)" = (cid:894)b" + c"(cid:895)(cid:894)d" + e"(cid:895) = b"d" + b"e" + c"d" + c"e". O1 = a(bc + de) = abc + ade. O1 + o2 = b"d" + b"e" + c"d" + c"e" + abc + ade. Now we have each term in standard format. Left (inputs) to right (outputs), one gate at a time write the expression (logic) Best practice: express the functions as sum of products (standard form) Complexity is expressed as equivalent number of gates. The roo(cid:373)s that these chips are created i(cid:374) are called (cid:862)clea(cid:374) roo(cid:373)s(cid:863) they must be very clean because these chips are being created at the scale of dust. Adder: full adder, ripple carry adder.

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