8-bit Carry Lookahead Adder
- 4 ticks
- 6498
- 19×19×18
Verified specs
Credits
- Builder
unnecessarymb- Built
- October 7, 2026
- Imported by
embizone
File
- Name
8_bit_Carry_Lookahead_Adder.schem- Uploaded
- October 7, 2026
- Downloads
- 2
- Conventions
- followed
Inputs and outputs
| Input | Bits | Min SS | Power | Delay |
|---|---|---|---|---|
| A | 8 | 15 | hard | t = 0 |
| B | 8 | 15 | hard | 0t |
| carry in | 1 | — | soft | 0t |
| Output | Bits | Min SS | First change | Settles |
| 8 | 15 | 2t | 4t | |
| bit 0 | 15 | 2t | 4t | |
| bit 1 | 15 | 2t | 4t | |
| bit 2 | 15 | 2t | 4t | |
| bit 3 | 15 | 2t | 4t | |
| bit 4 | 15 | 2t | 4t | |
| bit 5 | 15 | 2t | 4t | |
| bit 6 | 15 | 2t | 4t | |
| bit 7 | 15 | 2t | 4t | |
| carry out | 1 | — | 2t | 4t |
Block distribution
- Solid
- 1207
- Dust
- 1037
- Torch
- 126
- Lever
- 17
Timing
- Synced
- ✗
- Bits apart, output
- 457,664 changes
- Changes tested
- 915,456
Glitch: output, all off → A=1, B=1, carry in=0
| t | 0 | 1 | 2 | 3 | 4 | expect |
|---|---|---|---|---|---|---|
| output | 0 | 0 | 1 | 0 | 2 | 2 |
output, bit by bit
| Bit | First changes | Settles by | Glitches |
|---|---|---|---|
| 0 | 2 | 4 | 98,304 |
| 1 | 2 | 4 | 81,920 |
| 2 | 2 | 4 | 81,920 |
| 3 | 2 | 4 | 81,920 |
| 4 | 2 | 4 | 81,920 |
| 5 | 2 | 4 | 81,920 |
| 6 | 2 | 4 | 81,920 |
| 7 | 2 | 4 | 81,920 |
carry out, bit by bit
| Bit | First changes | Settles by | Glitches |
|---|---|---|---|
| 0 | 2 | 4 | 256 |