Characterizing the Effects of Intermittent Faults on a Processor for Dependability Enhancement Strategy

Table 5

Sensitivity breakup per unit for EXU workload ((a) for NET and (b) for REG).

(a) For NET (%)

Units	Module	Transient faults	Intermittent faults									Permanent faults
			B2_	B2_	B2_	B4_	B4_	B4_	B8_	B8_	B8_
			0.01–0.1	0.1–1	1–10	0.01–0.1	0.1–1	1–10	0.01–0.1	0.1–1	1–10
PKU	PKU_PCK	0.0	0.8	4.4	8.0	2.4	5.6	8.8	3.2	7.6	8.8	8.0
	PKU_PKD	3.1	3.4	24.9	41.1	6.9	25.4	47.7	12.3	33.4	56.3	53.7
	PKU_SWL	1.2	1.6	12.1	19.4	3.6	15.4	23.9	4.0	18.2	22.7	23.5
AGEN	IFU_AGD	1.7	1.3	4.6	14.3	0.8	8.9	17.3	4.2	11.4	23.2	23.2
	IFU_AGC	0.5	2.3	9.6	16.9	4.6	14.2	20.5	7.3	13.7	24.2	25.2
Decoder	DEC_DED	0.4	1.2	4.9	16.2	1.6	4.5	20.2	2.0	9.7	25.9	27.1
	DEC_DCD	0.0	0.0	2.0	8.0	5.7	7.7	8.0	0.3	1.1	4.6	6.6
	DEC_DEL	2.2	1.3	11.3	20.3	6.1	15.6	23.8	7.4	17.3	26.0	22.9
ALU	EXU_ECT	1.7	1.3	5.9	13.5	3.0	8.4	17.3	3.8	9.3	24.6	27.8
	EXU_EDP	0.4	1.3	3.1	11.4	1.3	5.7	21.9	2.2	9.2	26.3	50.0
IRF	EXU_IRF	1.7	2.1	5.2	20.2	3.0	7.7	27.9	4.3	13.7	33.5	33.7
	EXU_RML	0.5	0.0	8.3	12.8	3.7	10.6	14.7	3.7	11.9	16.1	52.6
	EXU_ECC	0.4	0.4	2.1	5.9	0.8	3.4	8.8	0.4	4.2	12.2	13.8

(b) For REG (%)

Units	Module	Transient faults	Intermittent faults									Permanent faults
			B2_	B2_	B2_	B4_	B4_	B4_	B8_	B8_	B8_
			0.01–0.1	0.1–1	1–10	0.01–0.1	0.1–1	1–10	0.01–0.1	0.1–1	1–10
PKU	PKU_PCK	0	0	0	0	0	0	0	0	0	0	0
	PKU_PKD	—	—	—	—	—	—	—	—	—	—	—
	PKU_SWL	11	12	14	13	13	15	18	13	17	18	18
AGEN	IFU_AGD	0.9	0.9	1.8	7.1	1.8	4.4	10.6	2.7	8.0	11.5	11.5
	IFU_AGC	2.3	1.5	0.8	6.9	1.5	2.3	9.2	2.3	3.8	9.9	8.4
Decoder	DEC_DED	3.9	1.0	1.9	15.5	1.9	5.8	16.5	1.0	10.7	18.4	18.4
	DEC_DCD	—	—	—	—	—	—	—	—	—	—	—
	DEC_DEL	4.2	1.7	2.5	6.7	5.0	1.7	10.9	4.2	4.2	10.9	9.2
ALU	EXU_ECT	3.5	3.5	4.4	12.4	3.5	4.4	14.2	5.3	6.2	18.6	20.4
	EXU_EDP	5.7	4.9	4.1	14.8	1.6	9.8	24.6	5.7	11.5	30.3	27.0
IRF	EXU_IRF	6.0	4.3	9.4	23.1	3.4	9.4	36.8	6.0	16.2	37.6	39.3
	EXU_RML	9.8	9.8	9.8	13.6	10.6	12.1	20.5	9.8	14.4	21.2	11.4
	EXU_ECC	3.6	3.6	1.8	3.6	3.6	0.9	8.0	0.9	2.7	9.8	3.6