Circuit having a low power mode
First Claim
1. An integrated circuit (IC) capable of responding to power-up messages while in a low-power state, the IC comprising:
- a digital interface;
a digital input connected to the digital interface;
a configuration memory configured to store configuration information defining a configuration of the IC;
primary operation circuitry connected to the digital interface and configured to perform one or more primary tasks, the primary operation circuitry configured for selectively having at least a portion of its power removed during a low power mode; and
a first power manager connected to the primary operation circuitry and the digital input, the first power manager configured to receive a set of one or more predefined digital signals over the digital input during the low power mode, change the information stored in the configuration memory, and initiate a power up of the primary operation circuitry in response to the set of predefined digital signals;
wherein the primary operation circuitry includes a second power manager configured to be powered down during the low power mode, and further configured to be powered up and perform power up operations on the primary operation circuitry in response to a signal from the first power manager.
1 Assignment
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Accused Products
Abstract
Embodiments of the invention include an IC that includes a core used for ordinary operation and a thin power circuit. The thin power circuit can be configured to use very little power. The IC can also include a digital interface and a connection thereto. The IC can initiate transition to low power mode during which the core and various I/O pads can be shut down. However, the thin power circuit can be kept powered up. The thin power circuit can monitor the digital interface for a predefined wake up signal. When the wake up signal is detected, the thin power circuit can power up the core and any powered down I/O pads. The thin power circuit can also include a dedicated power on reset (POR) cell. This POR cell can be distinct than other POR cells used for the IC and can be specifically designed to for efficient operation.
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Citations
43 Claims
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1. An integrated circuit (IC) capable of responding to power-up messages while in a low-power state, the IC comprising:
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a digital interface; a digital input connected to the digital interface; a configuration memory configured to store configuration information defining a configuration of the IC; primary operation circuitry connected to the digital interface and configured to perform one or more primary tasks, the primary operation circuitry configured for selectively having at least a portion of its power removed during a low power mode; and a first power manager connected to the primary operation circuitry and the digital input, the first power manager configured to receive a set of one or more predefined digital signals over the digital input during the low power mode, change the information stored in the configuration memory, and initiate a power up of the primary operation circuitry in response to the set of predefined digital signals; wherein the primary operation circuitry includes a second power manager configured to be powered down during the low power mode, and further configured to be powered up and perform power up operations on the primary operation circuitry in response to a signal from the first power manager. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A portable audio player including an integrated circuit (IC) capable of responding to power-up messages while in a low-power state, the IC comprising:
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a digital interface; a digital input connected to the digital interface; a configuration memory configured to store configuration information defining a configuration of the IC; primary operation circuitry configured to perform one or more primary tasks and connected to the digital interface, the IC being configured to selectively remove at least a portion of its power from the primary operation circuitry during a low power mode; and a first power manager connected to the primary operation circuitry and the digital input, the first power manager configured to receive a set of one or more predefined digital signals over the digital input during the low power mode, in response to the set of predefined digital signals, change the information stored in the configuration memory, and initiate a power up of the primary operation circuitry; wherein the primary operation circuitry includes a second power manager configured to be powered down during the low power mode, and further configured to be powered up and perform power up operations on the primary operation circuitry in response to a signal from the first power manager.
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18. A mobile telephone including an integrated circuit (IC) capable of responding to power-up messages while in a low-power state, the IC comprising:
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a digital interface; a digital input connected to the digital interface; a configuration memory configured to store configuration information defining a configuration of the IC; primary operation circuitry configured to perform one or more primary tasks and connected to the digital interface, the IC being configured to selectively remove at least a portion of its power from the primary operation circuitry during a low power mode; and a first power manager connected to the primary operation circuitry and the digital input, the first power manager configured to receive a set of one or more predefined digital signals over the digital input during the low power mode, and in response to the set of predefined digital signals, change the information stored in the configuration memory, and initiate a power up of the primary operation circuitry; wherein the primary operation circuitry includes a second power manager configured to be powered down during the low power mode, and further configured to be powered up and perform power up operations on the primary operation circuitry in response to a signal from the first power manager.
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19. A method for operating an integrated circuit (IC) including primary operation circuitry including a digital interface, a digital input connected to the digital interface, a configuration memory configured to store configuration information defining a configuration of the IC, a second power manager dedicated for managing power of the primary operation circuitry and configured to be powered down during the low power mode, and a first power manager, the method comprising:
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powering down at least a portion of the primary operation circuitry including the second power manager during a low power mode while keeping the first power manager powered; receiving a set of one or more predefined digital signals over the digital input by the first power manger during the low power mode; and in response to the set of predefined digital signals, initiating a power up of the primary operation circuitry by the first power manager, including changing the information stored in the configuration memory and powering up the second power manager in response to a signal from the first power manager, and powering up the primary operation circuitry by the second power manager. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. An integrated circuit (IC) capable of reconfiguration while in a low-power state, the IC comprising:
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a configuration memory configured to store configuration information for the IC; a digital interface; a digital input connected to the digital interface; primary operation circuitry configured to perform one or more primary tasks and connected to the digital interface, the IC being configured to selectively remove at least a portion of its power from the primary operation circuitry during a low power mode; and a first power manager connected to the primary operation circuitry, the digital input and the configuration memory and configured to receive a set of one or more predefined digital signals over the digital input during the low power mode, in response to the set of predefined digital signals, change the information stored in the configuration memory, wherein changing the information stored in the configuration memory results in a change of the configuration of the IC; wherein the primary operation circuitry includes a second power manager dedicated for managing power of the primary operation circuitry and configured to be powered down during the low power mode, and further configured to be powered up and perform power up operations on the primary operation circuitry in response to a signal from the first power manager. - View Dependent Claims (32, 33, 34, 35)
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36. An integrated circuit (IC) capable of communication with external devices while in a low-power state, the IC comprising:
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an external device interface connected to one or more external devices; a host interface connected to a host; a configuration memory configured to store configuration information defining a configuration of the IC; primary operation circuitry configured to perform one or more primary tasks and connected to the external device interface and the host interface, the IC being configured to selectively remove at least a portion of its power from the primary operation circuitry during a low power mode; and a first power manager connected to the primary operation circuitry, and the external device and host interfaces, the first power manager configured to receive a set of one or more predefined digital signals over the external device interface during the low power mode, and in response to the set of predefined digital signals, change the information stored in the configuration memory, and send a signal to the host over the host interface, wherein the primary operation circuitry includes a second power manager configured to be powered down during the low power mode, and further configured to be powered up and perform power up operations on the primary operation circuitry in response to a signal from the first power manager. - View Dependent Claims (37, 38, 39, 40, 41, 42)
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43. An integrated circuit (IC) capable of responding to power-up messages while in a low-power state, the IC comprising:
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a digital interface; a digital input connected to the digital interface; a configuration memory configured to store configuration information defining a configuration of the IC; primary operation circuitry connected to the digital interface and configured to perform one or more primary tasks, during a normal power mode of operation of the IC, and to shut down operation during a low power mode of operation of the IC; and a first power manager connected to the primary operation circuitry and the digital input, the first power manager configured to operate during the normal and low power modes of the IC, the first power manager configured to receive a set of one or more predefined digital signals over the digital input during the low power mode and, in response to the set of predefined digital signals, change the information stored in the configuration memory; wherein the primary operation circuitry includes a second power manager configured to be powered down during the low power mode, and further configured to be powered up and perform power up operations on the primary operation circuitry in response to a signal from the first power manager, and wherein at least a portion of the first power manager is in a disarmed state during a normal power mode.
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Specification