4-Bit Full Adder and Subtractor with hardware trojan inserted in the critical path
Use DIP Switches, provide external input for last B input bit and hardware trojan trigger signal.
Pattern Generator and logic analyzer
| # | Input | Output | Bidirectional |
|---|---|---|---|
| 0 | Add/Subtract | 7 Segment Display | Input - B3 |
| 1 | A0 | 7 Segment Display | Input - Hardware Trojan Trigger |
| 2 | B0 | 7 Segment Display | Output - LFSR 1 |
| 3 | A1 | 7 Segment Display | Output - LFSR 2 |
| 4 | B1 | 7 Segment Display | Output - LFSR 3 |
| 5 | A2 | 7 Segment Display | Input - LFSR 3 |
| 6 | B2 | 7 Segment Display | Input - LFSR 4 |
| 7 | A3 | 7 Segment Display | Output - LFSR 7 |