UMBC CMSC 313, Computer Organization & Assembly Language, Fall 2004, Section 0101

Circuits for Addition

Thursday 11/04, 2004

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Assigned Reading in Murdocca & Heuring:  3.5

Assigned Reading in Neveln:   

Assigned:  HW3

Due:  DigSim1

Slides (in PDF): Slides18.pdf

Topics Covered:

• Returned midterm exam and discussed the solutions.
• Design of a half adder and a full adder.
• Using 4 full adders to construct a 4-bit ripple carry adder.
• A 4-bit carry-lookahead adder.
• Considered the trade-offs between speed (lower propagation delay) and size (number of gates).
• A combined adder/subtractor is possible for two's complement numbers.
• Multiplexers