8-bit Carry Lookahead Adder
- 10 ticks
- 3971
- 11×19×19
Verified specs
Credits
File
- Name
8_bit_Carry_Lookahead_Adder.schem- Uploaded
- October 7, 2026
- Downloads
- 1
- Conventions
- followed
Inputs and outputs
| Input | Bits | Inverted | Min SS | Power | Delay |
|---|---|---|---|---|---|
| A | 8 | No | 5 | hard | t = 0 |
| B | 8 | No | 5 | hard | 0t |
| carry in | 1 | Yes | — | hard | +1t |
| Output | Bits | Inverted | Min SS | First change | Settles |
| 8 | No | 15 | 3t | 10t | |
| bit 0 | 15 | 3t | 6t | ||
| bit 1 | 15 | 3t | 6t | ||
| bit 2 | 15 | 3t | 7t | ||
| bit 3 | 15 | 3t | 7t | ||
| bit 4 | 15 | 3t | 9t | ||
| bit 5 | 15 | 3t | 9t | ||
| bit 6 | 15 | 3t | 10t | ||
| bit 7 | 15 | 3t | 10t | ||
| carry out | 1 | No | — | 2t | 10t |
Block distribution
- Solid
- 587
- Dust
- 466
- Torch
- 121
- Lever
- 17
Timing
- Synced
- ✗
- Bits apart, output
- 210,739 changes
- Changes tested
- 915,456
Glitch: output, all off → A=3, B=0, carry in=0
| t | 0 | 1 | 2 | 3 | 4 | 5 | 6 | expect |
|---|---|---|---|---|---|---|---|---|
| output | 1 | 1 | 1 | 1 | 3 | 0 | 4 | 4 |
output, bit by bit
| Bit | First changes | Settles by | Glitches |
|---|---|---|---|
| 0 | 3 | 6 | 49,152 |
| 1 | 3 | 6 | 176,128 |
| 2 | 3 | 7 | 153,600 |
| 3 | 3 | 7 | 184,832 |
| 4 | 3 | 9 | 173,696 |
| 5 | 3 | 9 | 170,048 |
| 6 | 3 | 10 | 170,176 |
| 7 | 3 | 10 | 189,360 |
carry out, bit by bit
| Bit | First changes | Settles by | Glitches |
|---|---|---|---|
| 0 | 2 | 10 | 6,992 |