CAPC - Part 7


The ALU Combinational Circuit

I slowly worked through the instructions for building an ALU, getting stuck several times along the way. I would test the next iteration of my ALU and find that if certain inputs were turned on the outputs would turn to X's (no signal). In all cases I found the only way to fix the problem was to recreate the device (not the design, just the device derived from it). For whatever reason this would fix it.

Anyways, I finally completed the tedious process and I have to admit that the ALU is a pretty amazing device. It was so much simpler than I ever thought an ALU would be. These diagrams show the 1-bit ALU I started from and the stages of constucting larger and larger ALU's from smaller ones.


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