Semiconductor device, semiconductor system, and method of operating the semiconductor device
First Claim
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1. A system on chip (SoC) comprising:
- a clock management unit (CMU) comprising a plurality of clock circuits, a control circuit and an output pin, the CMU configured to receive a request signal from a first external device or the control circuit, and generate a clock signal using the plurality of clock circuits in response to the request signal,wherein the control circuit is configured to determine whether the CMU is to operate in one of a functional mode and a monitoring mode,wherein the control circuit is configured to provide the request signal to at least one of the clock circuits and selectively provide one of a plurality of outputs of the clock circuits to the output pin in response to at least one acknowledgment signal received from at least one of the clock circuits, when the CMU is determined to operate in the functional mode, andwherein the control circuit is configured to selectively provide one of the plurality of outputs to the output pin without providing the request signal to any of the clock circuits, when the CMU is determined to operate in the monitoring mode.
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Abstract
A system on chip (SoC) includes a control circuit configured to determine whether a requested operating mode is one of a functional mode and a monitoring mode. The control circuit is configured to provide a request signal to at least one clock circuit to request at least one clock signal and selectively output one of the at least one clock signal in response to at least one acknowledgment signal received from the at least one clock circuit, when the requested operating mode is the functional mode. The control circuit is configured to selectively output one of the at least one clock signal without providing the request signal, when the requested operating mode is the monitoring mode.
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Citations
24 Claims
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1. A system on chip (SoC) comprising:
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a clock management unit (CMU) comprising a plurality of clock circuits, a control circuit and an output pin, the CMU configured to receive a request signal from a first external device or the control circuit, and generate a clock signal using the plurality of clock circuits in response to the request signal, wherein the control circuit is configured to determine whether the CMU is to operate in one of a functional mode and a monitoring mode, wherein the control circuit is configured to provide the request signal to at least one of the clock circuits and selectively provide one of a plurality of outputs of the clock circuits to the output pin in response to at least one acknowledgment signal received from at least one of the clock circuits, when the CMU is determined to operate in the functional mode, and wherein the control circuit is configured to selectively provide one of the plurality of outputs to the output pin without providing the request signal to any of the clock circuits, when the CMU is determined to operate in the monitoring mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A clock signal output circuit configured to communicate with a clock management unit (CMU) comprising a plurality of clock circuits, the CMU configured to generate a clock signal using the clock circuits in response to a request signal, the clock signal output circuit comprising:
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a clock multiplexing circuit configured to receive a plurality of clock signals from a outputs of the plurality of clock circuits, a logic circuit; and an output pin, wherein the logic circuit outputs a control signal to the clock multiplexing circuit when a current mode is set to a functional mode, wherein the clock multiplexing circuit outputs the request signal to the clock circuits in response to the control signal, and outputs one of the outputs to the output pin after receiving at least one acknowledgement signal from at least one of the clock circuits, and wherein the clock multiplexing circuit outputs one of the outputs to the output pin without providing the request signal to any of the clock circuits when the current mode is set to a monitoring mode. - View Dependent Claims (17, 18)
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19. A clock signal output circuit configured to communicate with a clock management unit (CMU) comprising a clock circuit, the CMU configured to generate a clock signal using the clock circuit in response to a request signal, the clock signal output circuit comprising:
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a clock dividing circuit configured to perform a dividing operation on the clock signal output by the clock circuit to generate a divided clock signal; a logic circuit; and an output pin, wherein the logic circuit outputs a signal to the clock dividing circuit when a current mode is set to a functional mode, wherein the clock dividing circuit outputs the request signal to the clock circuit in response to the control signal, and outputs the divided clock signal to the output pin after receiving an acknowledgement signal from the clock circuit, and wherein the clock dividing circuit outputs the divided clock signal to the output pin without providing the request signal to the clock circuit when the current mode is set to a monitoring mode. - View Dependent Claims (20, 21)
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22. A method of operating a system on chip (SoC) comprising a clock management unit (CMU) comprising a plurality of clock circuits, a control circuit and an output pin, the CMU configured to receive a request signal from a first external device or the control circuit, and generate a clock signal using the plurality of clock circuits in response to the request signal, the method comprising:
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determining, by the control circuit of the SoC, whether to operate in one of a functional mode and a monitoring mode; when the control circuit determines to operate in the functional mode, providing, by the control circuit, the request signal to at least one of the clock circuits of the SoC; and providing, by the control circuit, one of a plurality of outputs of the clock circuits to the output pin after receiving at least one acknowledgement signal from at least one of the clock circuits, when the control circuit determines to operate in the monitoring mode, providing, by the control circuit, one of the outputs to the output pin without providing the request signal to any of the clock circuits. - View Dependent Claims (23, 24)
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Specification