1. HW6 Due on 11/8/11

2. Use 74LS86D and 7408N to implement a half- adder. Build a full adder from two half adders. Build a 3 bit adder from two-one full bit adder and one bit half-adder. You can reuse circuits by building subcircuits. (Please see the next slide)

3. Adding Subcircuits to a Circuit (1) Please look at MultiSim’s help for adding subcircuit

4. Top-level schematic

5. Submission Check List Schematic of the Half-Adder Subcircuit Schematic of the Full Adder Subcircuit Schematic of the 3-bit Adder Submit the top level schematic of the following arithmatic: – 2+1=? – 2-1=?