Table 1.

Results comparison for various implementations of the KWS task on SENECA.

Experiment	Inference	RISC-V	NPEs	Dmem	Total Core
	Time (μS)	Energy (μJ)	Energy (μJ)	Energy (μJ)	Energy (μJ)
(1) RISC-V only	6,625	29.1	0.013	1.67	34.0
(2) +NPEs	1,098	2.87	1.91	1.45	6.71
(3) +Loop Controller	541	0.23	1.29	1.16	2.81
(4) +Event Generator	400	0.24	0.92	0.83	2.10
(5) +Spike-grouping	218	0.17	0.50	0.47	1.20

All reported time and energies are for one inference (averaged over the dataset). RISC-V energy includes RISC-V and its instruction memory. NPEs energy includes all NPEs, Loop buffer and Event-generator blocks. In all the experiments, the accuracy is the same (93%). The reported energy numbers include the leakage power of 30μW.