# US 2014/0156884 A1 · Adaptive accessory detection and mode negotiation

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- Number: US 2014/0156884 A1
- Document ID: US20140156884A1
- Status: Published application
- Kind: A1
- Application number: 14/058,291
- Filed: 2013-10-21
- Published: 2014-06-05
- Earliest claimed: 2009-03-16
- Assignees: Apple Inc.
- Applicants: Apple Inc.
- Inventors: Jeffrey J. Terlizzi; Jesse L. Dorogusker
- Web page: https://patentgrep.com/patent/US20140156884A1

## CPC

- G06F 13/385: {for adaptation of a particular data processing system to different peripheral devices}
- G06F 13/426: {using an embedded synchronisation, e.g. Firewire bus, Fibre Channel bus, SSA bus}
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)

## Abstract

Methods and apparatus for providing device detection and operational mode negotiation entirely over extant high-speed data bus pins or terminals. In one exemplary embodiment, methods and apparatus are disclosed enabling detection, negotiation and serial/video data transfer over USB 2.0 data interface pins in order to consolidate pin count on the interface and associated connector. Existing USB detection mechanisms are also leveraged to the maximum extent so as to eliminate the need for additional detection protocols. This approach allows for smaller connector and parent device form factor, while still maintaining all of the functional capabilities required for that interface. The breadth of USB-capable devices supported by such an interface is also markedly improved over prior art techniques.

## Claims

### Claim 1

A method of operating a peripheral interface of a media-capable device, the method comprising:
after connection of an accessory to a connector of the peripheral interface, detecting the presence of a power signal on a power conductor of the connector, the power conductor being associated with a USB data interface;
determining the values of first and second signals on respective first and second conductors of the connector, the first and second conductors being associated with the USB data interface;
based on at least the determining, classifying the accessory as either (i) a power supply accessory, or (ii) a USB host device.

### Claim 2 (depends on 1)

The method of claim 1, wherein the connector comprises a multi-pin connector having serial, video, and a high speed serialized bus protocol conductors in addition to the power conductor and first and second conductors.

### Claim 3 (depends on 1)

The method of claim 1, wherein the determining the values of signals on first and second conductors associated with the USB data interface comprises evaluating for both SE0 and SE1 conditions on the D+/D− conductors of the USB interface.

### Claim 4 (depends on 3)

The method of claim 3, wherein the classifying the accessory as either (i) a power supply accessory, or (ii) a USB host device, comprises classifying the accessory as a USB host device when neither the SE0 or SE1 conditions are detected.

### Claim 5

A method of operating a peripheral interface of a media-capable device, the method comprising:
after connection of an accessory to a connector of the peripheral interface, detecting the absence of a power signal on a power conductor of the connector, the power conductor being associated with a USB data interface;
determining the value of a signal on a conductor of the connector, the conductor being used for detecting the presence of the accessory;
determining the values of first and second signals on respective first and second data conductors of the connector, the first and second conductors being associated with the USB data interface; and
based on the acts of determining, operating the media-capable device as a USB host device.

### Claim at position 6

6-19. (canceled)