UMBC CMSC 313, Computer Organization & Assembly Language, Fall 2014

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Wednesday, Nov. 12, 2014

Assigned:         Due:   

Circuits for Addition

Assigned Reading in Null & Lobur:  3.4–3.5

Assigned Reading in Duntemann:   

Actual Slides (in PDF): Slides21.pdf

Topics:

• half adder, full adder, ripple-carry adder, carry lookahead adder
• logic components: MUX, DEMUX, Decoders
• Logisim demo

Logisim Circuts Shown: Download these to your local disk and open with Logisim.

• A NAND gate from transistors: NAND Gate.circ.
• A NOR gate from transistors: NOR Gate.circ.
• Half Adder.circ
• Full Adder.circ
• Component Decoder.circ
• 4-1 DEMUX.circ
• 4-1 MUX.circ
• Combined Adder-Subtractor.circ
• 2-bit ALU.circ