Table 8.
Energy consumption breakdown for various instructions executes in NPEs.
| Instruction | Description | Energy of | Energy of | Energy of | Total Energy |
|---|---|---|---|---|---|
| computation | each NPE | loop buffer | per instruction | ||
| ADD/SUB/MUL | FP16 Arithmetic ops. | 0.5 | 1.3 | 0.9 | 1.4 |
| 2xINT8b Arithmetic ops. | 0.3 | 1.1 | 0.9 | 1.2 | |
| GTH/MAX/MIN | FP16 Compare ops. | 0.3 | 1.1 | 0.9 | 1.2 |
| EQL/ABS | 0.2 | 1.0 | 0.9 | 1.1 | |
| AND/ORR | 16b Bit-wise ops. | 0.2 | 1.0 | 0.9 | 1.1 |
| SHL/SHR | 0.3 | 1.1 | 0.9 | 1.2 | |
| I2F | Data type cnv. | 0.3 | 1.0 | 0.9 | 1.1 |
| RND | 0.6 | 1.3 | 0.9 | 1.4 | |
| Instruction | Description | Energy of | Energy of | Energy of | Total energy |
| Data-Mem-16b | each NPE | loop buffer | per instruction | ||
| MLD | 16b Data Mem load | 2.9 | 0.6 | 1.6 | 3.7 |
| MST | 16b Data Mem store | 3.5 | 0.2 | 1.6 | 3.9 |
| Instruction | Description | Energy of | Energy of | Energy of | Total energy |
| event generator | each NPE | loop buffer | per instruction | ||
| EVC | Event capture | 0.6 | 0.4 | 0.5 | 0.5 |
| + per generated event | +1.1 | +0 | +0 | +1.1 | |
| Instruction | Description | Energy of | Energy of | Energy of | Total Energy |
| RV+Peripheries | Inst-Mem-32b | Data-Mem-32b | per instruction | ||
| RISC-V Ops | Averaged per instruction | 5.9 | 5.7 | 0 | 11.6 |
| + Data Mem access | +10 | +10 | |||
| NOC | Per 32b event transmission | – | – | – | 2 |
The energy of the computation is part of the NPE's energy, consumed by the involved compute logic inside the NPE. All the numbers are in pJ.