Semiconductor integrated circuit
AssigneePanasonic Corporation
InventorMasayoshi SHIOTANI
Life of this patent
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Abstract
A constantly power-ON domain and a standby-time power OFF domain are included on the same chip, and the constantly power-ON domain includes: a shutoff control circuit shutting off a signal inputted and outputted between the constantly power-ON domain and the standby-time power OFF domain when the first power source is ON and the second power source is OFF; and a shutoff control circuit outputting a first control signal indicating that shutoff of an emergent shutoff control circuit unit is to be enabled or disabled, the standby-time power OFF domain includes the emergent shutoff control circuit unit shutting off, based on the first control signal from the shutoff control circuit, the signal inputted between the emergent shutoff control circuit unit and the constantly power-ON domain.
Claims10
A semiconductor integrated circuit including on a same chip a power-ON domain as a circuit region which receives power supply from a first power source and a power-OFF domain as a circuit region which receives power supply from a second power source provided independently from the first power source and in which the second power source is turned off by control of the power-ON domain to thereby stop the power supply from the second power source, the power-ON domain including:
- a first signal shutoff unit configured to shut off a signal inputted and outputted between said power-ON domain and said power-OFF domain when said first power source is ON and said second power source is OFF;
- and
- a shutoff control unit configured to output a first control signal indicating that shutoff by a second signal shutoff unit different from the first signal shutoff unit is to be enabled or disabled,
- wherein said power-OFF domain includes said second signal shutoff unit configured to shut off the signal inputted and outputted between said power-ON domain and said power-OFF domain based on the first control signal which indicates that shutoff is to be enabled and which is outputted from said shutoff control unit, and
- said shutoff control unit is configured to, upon detection of stop of the power supply from the first power source, output the first control signal indicating that the shutoff is to be enabled.
Dependencies are inferred from the claim text.