# US 9,519,336 B2 · Semiconductor integrated circuit and method for controlling power supply in semiconductor integrated circuit > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,519,336 B2 - Document ID: US9519336B2 - Status: Granted - Kind: B2 - Application number: 14/885,852 - Filed: 2015-10-16 - Published: 2016-04-21 - Granted: 2016-12-13 - Earliest claimed: 2014-10-21 - Assignees: Canon Kabushiki Kaisha - Applicants: Canon Kabushiki Kaisha - Inventors: Yoshihisa Nomura - Web page: https://patentgrep.com/patent/US9519336B2 ## CPC - G06F 1/3287: by switching off individual functional units in the computer system - Y02D 10/00: Energy efficient computing, e.g. low power processors, power management or thermal management - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) - Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE ## Abstract A semiconductor integrated circuit includes a control unit that controls power supply to a plurality of power supply domains respectively corresponding to a plurality of functions included in an apparatus. A circuit integrates bus signals between the plurality of power supply domains is included in a specific power supply domain out of the plurality of power supply domains, and the control unit controls the power supply to the specific power supply domain to be performed prior to the other power supply domains connected with the specific power supply domain. ## Claims ### Claim 1 A semiconductor integrated circuit comprising: a control unit configured to control supply of power to a plurality of power supply domains respectively corresponding to a plurality of functions included in an apparatus, wherein a circuit configured to integrate bus signals between the plurality of power supply domains is included in a specific power supply domain out of the plurality of power supply domains, and the control unit performs control such that the supply of power to the specific power supply domain is carried out prior to the other power supply domains connected with the specific power supply domain. ### Claim 2 (depends on 1) The semiconductor integrated circuit according to claim 1, wherein the control unit further controls cutoff of the power supply to the specific power supply domain to be performed after the cutoff of the power supply to the other power supply domains. ### Claim 3 (depends on 1) The semiconductor integrated circuit according to claim 1, wherein an isolator that holds a signal value is provided on an output signal line from the other supply domains to the specific power supply domain, and an isolator that holds a signal value is not provided on an output signal line from the specific power supply domain to the other power supply domains. ### Claim 4 (depends on 1) The semiconductor integrated circuit according to claim 1, wherein the specific power supply domain is a power supply domain corresponding to a function having a high use frequency out of the plurality of functions included in the apparatus. ### Claim 5 (depends on 1) The semiconductor integrated circuit according to claim 1, wherein the bus signals include a signal of an image data bus. ### Claim 6 (depends on 1) The semiconductor integrated circuit according to claim 1, wherein the bus signals include a signal of a register bus. ### Claim 7 (depends on 1) The semiconductor integrated circuit according to claim 1, wherein the apparatus is an image forming apparatus including at least a print function. ### Claim 8 A method for controlling power supply to a plurality of power supply domains, in a semiconductor integrated circuit including the plurality of power supply domains respectively corresponding to a plurality of functions included in an apparatus, the semiconductor integrated circuit including, in a specific power supply domain out of the plurality of power supply domains, a circuit configured to integrate bus signals between the plurality of power supply domains, the method comprising: controlling the power supply to the specific power supply domain to be performed prior to the other power supply domains connected with the specific power supply domain. ### Claim 9 (depends on 8) The method according to claim 8, further comprising: controlling cutoff of the power supply to the specific power supply domain to be performed after the cutoff of the power supply to the other power supply domains. ### Claim 10 (depends on 8) The method according to claim 8, wherein an isolator that holds a signal value is provided on an output signal line from the other power supply domains to the specific power supply domain, and an isolator that holds a signal value is not provided on an output signal line from the specific power supply domain to the other power supply domains. ### Claim 11 (depends on 8) The method according to claim 8, wherein the specific power supply domain is a power supply domain corresponding to a function having a high use frequency, out of the plurality of functions included in the apparatus. ### Claim 12 (depends on 8) The method according to claim 8, wherein the bus signals include a signal of an image data bus. ### Claim 13 (depends on 8) The method according to claim 8, wherein the bus signals include a signal of a register bus.