METHOD AND APPARATUS FOR SWITCHING CLOCK FREQUENCY IN A SYSTEM-IN-PACKAGE DEVICE
First Claim
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1. An apparatus, comprising:
- a first clock source;
a second clock source; and
circuitry configured to supply a clock signal to a circuit, said circuitry configured to change the clock signal from one frequency to another different frequency such that no clock signal is supplied when changing from said one frequency to a said another different clock frequency.
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Abstract
An apparatus includes a first clock source, a second clock source and circuitry configured to supply a clock signal to a circuit. The circuitry operates to change the clock signal from one frequency to another different frequency. This change is made in a manner whereby no clock signal is supplied during a period of time when the change from the one frequency to the another different clock frequency is being made.
21 Citations
28 Claims
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1. An apparatus, comprising:
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a first clock source; a second clock source; and circuitry configured to supply a clock signal to a circuit, said circuitry configured to change the clock signal from one frequency to another different frequency such that no clock signal is supplied when changing from said one frequency to a said another different clock frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. An apparatus, comprising:
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a transmit physical interface including a data output and a clock output which is a timing reference for the data output; a first oscillating circuit configured to generate a first clock signal having a variable frequency; a second oscillating circuit configured to generate a second clock signal at a fixed frequency; and a control circuit configured to control operation of the transmit physical interface during a change in frequency of the clock output, said control circuit operable to; terminate transmit physical interface data output with the clock output derived from the first clock signal; activate transmit physical interface data output with the clock output derived from the second clock signal; change frequency of the first clock signal; terminate transmit physical interface data output with the clock output derived from the second clock signal; and activate transmit physical interface data output with the clock output derived from the first clock signal at the changed frequency. - View Dependent Claims (22, 23, 24, 25)
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26. A method, comprising:
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transmitting data output from a transmit physical interface with a clock output derived from a first clock signal having a variable frequency; and in response to a need to change a frequency of the clock output; terminating transmission of data output from the transmit physical interface with the clock output derived from the first clock signal; activating transmission of data output from the transmit physical interface with the clock output derived from a second clock signal having a fixed frequency; changing a frequency of the first clock signal; terminating transmission of data output from the transmit physical interface data output with the clock output derived from the second clock signal; and activating transmission of data output from the transmit physical interface data output with the clock output derived from the first clock signal at the changed frequency. - View Dependent Claims (27, 28)
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Specification