Link to the Wokwi project: tiny-tapeout-1bit-alu
This design is based on the 1bit ALU from Structured Computer Organization: Andrew S. Tanenbaum.
| Pin | Function |
|---|---|
| 1 | CIN |
| 2 | INVA |
| 3 | A |
| 4 | ENA |
| 5 | B |
| 6 | ENB |
| 7 | F0 |
| 8 | F1 |
The following functions are supported:
| F1 | F0 | Operation |
|---|---|---|
| 0 | 0 | A AND B |
| 0 | 1 | NOT B |
| 1 | 0 | A OR B |
| 1 | 1 | ADD |
ENA and ENB enable/disable the respective input.
INVA inverts A before applying the operation.
CIN is used as input for the full adder.
The 7-segment display shows either a "0" or a "1" depending on the output. If the ADD operation is selected, the dot of the 7-segment display represents the COUT.