Qualcomm Incorporated

Amit Gupta

Hemant Kumar

Ameya Kulkarni

Andrew Cheung

Michael Leung

Systems and methods for using distributed Universal Serial Bus (USB) host drivers are disclosed. In one aspect, USB packet processing that was historically done on an application processor is moved to a distributed USB driver running in parallel on a low-power processor such as a digital signal processor (DSP). While a DSP is particularly contemplated, other processors may also be used. Further, a communication path is provided from the low-power processor to USB hardware that bypasses the application processor. Bypassing the application processor in this fashion allows the application processor to remain in a sleep mode for longer periods of time instead of processing digital data received from the low-power processor or the USB hardware. Further, by bypassing the application processor, latency is reduced, which improves the user experience.

Controlling data streams in universal serial bus (USB) systems

A Universal Serial Bus (USB) system supporting Display Alternate Mode functionality on a USB Type-C adapter is disclosed. In one aspect, a display controller in a display source device can detect a display sink device attached to a display connector of a USB Type-C split adapter and communicate a display data signal to at least three preconfigured display data pins without negotiating a pin assignment with the attached display sink device. In another aspect, the display source device can provide the display data signal to the preconfigured display data pins independent of attachment of the display sink device. By skipping the pin assignment negotiation or providing the display data signal regardless of attachment of the display sink device, it is possible to support Alternate Modes functionality without requiring a Power Delivery (PD) circuit, thus helping to reduce cost, power consumption, and implementation complexity of the display source device.

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San Diego, CA, United States of America

Amit Gupta