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# Lecture23-Adders - EE141 EE141 EECS141 Lecture#23 1 Midterm...

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EE141 1 EE141 EECS141 1 Lecture #23 EE141 EECS141 2 Lecture #23 Midterm 2 graded – More later Project Phase 2 Due TODAY

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EE141 2 EE141 EECS141 3 Lecture #23 Last lecture Energy Today’s lecture Adders, Multipliers Reading (Ch 11) EE141 EECS141 4 Lecture #23 Grading Results (on 34) Max: 28.3 Avg: 20.44 Median: 21.3 StdDev: 4.59 0 1 2 3 4 5 6 7 8 9 10 10-11 12-13 14-15 16-17 18-19 20-21 22-23 24-25 26-27 28-29 MT2 - Histogram
EE141 3 EE141 EECS141 5 Lecture #23 EE141 EECS141 6 Lecture #23 (kill) (kill)

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EE141 4 EE141 EECS141 7 Lecture #23 EE141 EECS141 8 Lecture #23 Define 3 new variable which ONLY depend on A, B Generate (G) = AB Propagate (P) = A B Kill = A B Can also derive expressions for S and C o based on K and P Propagate (P) = A + B Note that we will sometimes use an alternate definition for
EE141 5 EE141 EECS141 9 Lecture #23 Worst case delay linear with the number of bits Goal: Make the fastest possible carry path circuit t d = O( N ) t adder = ( N-1 ) t carry + t sum EE141 EECS141 10 Lecture #23 28 Transistors

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EE141 6 EE141 EECS141 11 Lecture #23 28 Transistors EE141 EECS141 12 Lecture #23
EE141 7 EE141 EECS141 13 Lecture #23 Exploit Inversion Property EE141 EECS141 14 Lecture #23

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Lecture23-Adders - EE141 EE141 EECS141 Lecture#23 1 Midterm...

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