METHODS AND APPARATUS FOR SAFE NEGOTIATION OF HIGH CURRENT FOR ACTIVE CABLE ASSEMBLIES
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Abstract
Methods and apparatus for the safe negotiation of high current for a High-Definition Multimedia Interface (HDMI) active cable assembly. In one embodiment, a method for detecting a Power for Cable Assembly (PCA)-capable source is disclosed, the method including: detecting, by a cable assembly, an assertion of a defined voltage on a power supply pin; forwarding an assertion of a hot plug detect signal pin, by the cable assembly, from a sink device towards the PCA-capable source; detecting, by the cable assembly, a reduction in the defined voltage on the power supply pin for a defined period of time in response to the forwarding; and detecting, by the cable assembly, a re-assertion of the defined voltage on the power supply pin subsequent to the lapse of the defined period of time. PCA dependent cable assemblies and PCA capable source devices are also disclosed.
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40 Claims
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1-20. -20. (canceled)
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21. A method for modifying a level of current draw from a source device by a cable assembly, the method comprising:
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determining whether a connection with the source device corresponds to a connection with a source device configured to supply electrical power via a cable assembly according to a prescribed protocol; and based on a determination that the connection does not correspond to a source device configured to supply electrical power via a cable according to the prescribed protocol, limiting the level of current draw from the source device. - View Dependent Claims (22, 23, 24, 25, 26, 27)
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28. A cable assembly configured for use between computerized devices, comprising:
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a first data interface that is configured to be communicative with a source device; a second data interface that is configured to be communicative with a sink device; and logic that is configured to enable the cable assembly to; determine whether the cable assembly is connected to a power-capable source device; and modify a level of current draw from the source device based at least on the determination; wherein the modification comprises, based on a determination that the cable assembly is connected to the power-capable source device, an increase in the level of current draw by the cable assembly from the power-capable source device;
orwherein the modification comprises, based on a determination that the cable assembly is not connected to the power-capable source device, a limitation of the level of current draw by the cable assembly from the source device. - View Dependent Claims (29, 30, 31, 32, 33, 34)
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35. Apparatus configured to enable a cable assembly to implement a prescribed protocol relating to the cable assembly, the apparatus comprising:
hardware logic configured to; detect that the cable assembly is coupled with a source device; determine whether the source device is capable of Power for Cable Assembly (PCA)-based operation, the determination being based on whether at least one PCA functionality is enabled on the source device; and responsive to a determination that the source device is not capable of PCA-based operation, limit a current draw from the source device to a prescribed level so as to prevent overdraw of current from the source device from a power supply pin associated with a network interface of the cable assembly. - View Dependent Claims (36, 37, 38, 39, 40)
Specification