ALU (9: Bitwise Logic) - Making an 8 Bit pipelined CPU - Part 34 @weirdboyjim
ALU (9: Bitwise Logic) - Making an 8 Bit pipelined CPU - Part 34 @weirdboyjim
Uploaded April 2019 | Updated September 2026, 1 week ago
The last function unit in the ALU is for handling bitwise logic. I look at a couple of ways of doing this but settle on using a set of eight 74LS253's.

There are now a total of eight control lines in the ALU, 4 for bitwise logic, 2 for the shift unit and 2 for carry select so in the next ALU video I'll show a method for managing those and presenting a simpler interface back to the pipeline.

Julian Ilett's video on the 74LS253 as a configurable logic gate: youtube.com/watch?v=15M63Zqkthk
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James Sharman |

ALU (9: Bitwise Logic) - Making an 8 Bit pipelined CPU - Part 34

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