Sample Circuit: Simple ALU

[jflanigan]

Here is a circuit for your educational enjoyment. It is based on information that was found at http://library.thinkquest.org/25111/alu.shtml (with some reorganization).

The 1-bit ALU supports the following functions:

0: a AND b
1: a OR b
2: NOT b
3: a PLUS b

The test harness shows how each of the circuits can be used. It also shows how the 1-bit ALU can be ganged to create a 4-bit ALU.

Regards,
John

[admin]

Nice. Are you planning to upscale it to CPU?

[jflanigan]

Yes, step by step, learning and stumbling along the way.