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US 8,275,914 B2Granted
Discovery of connections utilizing a control bus
AssigneeSilicon Image, Inc.
InventorsJason Seung-Min Kim, Inyeol Lee, Shrikant Ranade, Daeyun Shim
Life of this patent
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Abstract
Discovery of connections utilizing a control bus. An embodiment of a method includes detecting a transition of a control bus from a high state to a low state by a source device, the source device being configured to be coupled with a sink device via an interface, the interface including the control bus, the source device including a pullup device and the sink device including a pulldown device; pulsing the control bus to a high state at the source device; and upon detecting by the source device that the control bus remains in the high state ceasing the pulsing of the control bus to the high state, and transitioning the source device from a disconnected state to a connected state.
Claims21
A method comprising:
- detecting a transition of a control bus from a high state to a low state by a source device, the source device being configured to be coupled with a sink device via an interface, the interface including the control bus and a voltage bus, the source device including a resistive pullup device to be connected to the control bus and the sink device including a resistive pulldown device to be connected to the control bus;
- upon detecting by the source device of the transition of the control bus from the high state to the low state, pulsing the control bus to the high state at the source device;
- upon detecting by the source device that the control bus remains in the high state after pulsing of the control bus to the high state, the control bus remaining in the high state as a result of the sink device disconnecting the resistive pulldown device, then:
- ceasing the pulsing of the control bus to the high state, and
- transitioning the source device from a disconnected state to a connected state;
- and
- upon the source device detecting that a power source on the voltage bus is disabled for a certain time period while the source device is in the connected state, the source device transitioning from the connected state back to the disconnected state.
4 more elements
A method comprising:
- pulling a control bus potential to a low state at a sink device by a resistive pulldown device of the sink device, the sink device being configured to be coupled with a source device via an interface, the interface including the control bus and a voltage bus, the source device including a resistive pullup device;
- detecting a high state of the control bus at the sink device, wherein the detected high state of the control bus is a result of a pulsing of the control bus to the high state by the source device;
- and
- in response to the detection of the high state on the control bus by the sink device, the sink device operating to:
- disconnect the resistive pulldown device,
- transition to a connected state, and
- enable a power source to the voltage bus upon transitioning to the connected state;
- and
- detecting by the sink device the control bus transitioning to the low state and remaining in the low state for longer than a certain time period while the sink device is in the connected state, the sink device to then transition from the connected state to the disconnected state and disable the power source on the voltage bus.
6 more elements
An apparatus comprising:
- an interface for coupling with a second apparatus, the interface including a control bus and a power bus;
- a resistive pullup device coupled with the control bus;
- and
- a driver to drive a signal on the control bus;
- wherein the apparatus is configured to detect a transition of the control bus from a high state to a low state and the driver is configured to pulse the control line to a high state upon the detection of the control bus transitioning from the high state to the low state;
- wherein, upon the apparatus detecting that the control bus remains in the high state after a pulse of the control bus to the high state, the driver is to cease pulsing the control line to the high state and the apparatus is to transition from a disconnected state to a connected state;
- and
- wherein, upon the apparatus detecting that a voltage on the power bus is disabled for a certain time period while the apparatus is in the connected state, the apparatus is to transition from the connected state back to the disconnected state.
5 more elements
An apparatus comprising:
- an interface for coupling with a second device, the interface including a control bus and a power bus;
- a first resistive pulldown device and a second resistive pulldown device coupled with the control bus, the first resistive pulldown device being switchable;
- and
- a driver to drive a signal on the control bus;
- wherein the apparatus is configured to detect that the control bus is in a high state, the detected high state of the control bus being a result of a pulsing of the control bus to the high state by the second device, and, in response to the control bus being in the high state, the apparatus is to switch off the first resistive pulldown device, to transition the apparatus to a connected state, and to enable a voltage on the power bus;
- and
- wherein the apparatus is further configured to transition from the connected state to an unconnected state and to disable the voltage on the power bus upon detecting that the control bus remains in a low state for longer than a certain time period while the apparatus is in the connected state.
4 more elements
A method comprising:
- pulling a control bus potential to a low state at a sink device by a resistive pulldown device of the sink device, the sink device being coupled with a source device via an interface, the interface including the control bus and a voltage bus;
- detecting transition of the control bus from a high state to the low state by the source device, the source device including a resistive pullup device to be connected to the control bus;
- upon detecting by the source device of the transition of the control bus from the high state to the low state, pulsing the control bus to the high state at the source device;
- detecting the high state of the control bus at the sink device caused by the pulsing of control bus, the sink device then:
- disconnecting the resistive pulldown device,
- transitioning the sink device to a connected state, and
- enabling a power source to the voltage bus upon transitioning to the connected state;
- and
- detecting by the source device that the control bus remains in the high state after pulsing of the control bus to the high state, the control bus remaining in the high state as a result of the sink device disconnecting the resistive pulldown device, the source device then:
- ceasing the pulsing of the control bus to the high state, and
- transitioning the source device from a disconnected state to a connected state.
8 more elements
A system comprising:
- a first apparatus including:
- an interface for coupling with a second apparatus, the interface including a control bus and a power bus;
- a resistive pullup device coupled with the control bus;
- and
- a first driver to drive a signal on the control bus;
- and
- a second apparatus including:
- an interface for coupling with the first device;
- a first resistive pulldown device and a second resistive pulldown device coupled with the control bus, the first resistive pulldown device being switchable;
- and
- a second driver to drive a signal on the control bus;
- wherein:
- the first apparatus is configured to detect a transition of the control bus from a high state to a low state and the first driver is configured to pulse the control line to a high state upon the detection of the control bus transitioning from the high state to the low state, and
- upon the first apparatus detecting that the control bus remains in the high state after a pulse of the control bus to the high state, the first driver is to cease pulsing the control line to the high state and the first apparatus is to transition from a disconnected state to a connected state;
- and
- wherein the second apparatus is configured to detect that the control bus is in a high state, the detected high state of the control bus being a result of a pulsing of the control bus to the high state by the first device, and, in response to the control bus being in the high state, the apparatus is to switch off the first resistive pulldown device, to transition the apparatus to a connected state, and to enable a voltage on the power bus.
13 more elements
Dependencies are inferred from the claim text.