Displayport CE system control functionality

• US 7,937,501 B2
• Filed: 02/26/2007
• Issued: 05/03/2011
• Est. Priority Date: 02/26/2007
• Status: Active Grant

• Current Assignee: Dell Products LP (Dell Technologies Inc.)
• Original Assignee: Dell Products LP (Dell Technologies Inc.)
• Inventors: Goodart, Joseph Edgar, Douglas, David W.
• Primary Examiner(s): Sorrell; Eron J
• Assistant Examiner(s): Phan; Dean
• Application Number:
  US11/678,838
• Publication Number:
  US 20080205519A1
• Time in Patent Office: 1,527 Days
• Field of Search: None
• US Class Current: 710/2
• CPC Class Codes: G06F 3/14 Digital output to display device ; Cooperation and interconnection of the display device with other functional units
• CPC Class Codes: G09G 5/006 Details of the interface to the display terminal specific for a display terminal using a CRT G09G1/167; using a flat panel G09G3/2096; circuits for interfacing with colour displays G09G5/04

Abstract

An improved method and apparatus is disclosed for communicating control information between components of an audio/video system. Processing and control logic is implemented to transfer a plurality of data streams on predetermined channels of a digital video interface. A first data stream contains video data received by a video interface receiver, where it is used to generate an image on a digital display. A second data stream contains control data, which is similarly received by the video interface receiver, and is used to control source devices coupled to the digital display.

Claims

1. An information handling system, comprising:

data processing logic configured to process a first data stream of video data for a video display and a second data stream of non-video control data for a plurality of source devices, wherein said plurality of source devices are configured to transfer said video data to said video display;

a data transfer interface comprising a plurality of data channels, said data transfer interface operably coupled to said video display and said plurality of source devices, wherein said data transfer interface comprises a Video Electronics Standards Association (VESA) DisplayPort interface and said plurality of data channels comprises a VESA DisplayPort main link and a VESA DisplayPort auxiliary channel; and

control logic configured to use a first subset of said plurality of data channels to transfer said first data stream to said video display and to use a second subset of said plurality of data channels to transfer said second data stream to said plurality of source devices;

wherein said control logic is used to perform Extended Display Identification Data (EDID) read operations on said video display to retrieve its EDID information upon activation of an individual source device of the plurality of source devices, and

wherein said EDID information is used by said individual source device to perform DisplayPort Configuration (DPCD) read operations to train said VESA DisplayPort main link for the conveyance of said video data and said non-video control data between said video display and said individual source device;

wherein said auxiliary channel is configured to transfer said second data stream of non-video control data in accordance with VESA monitor command control set (MCCS) parameters; and

MCCS operations are performed once said VESA DisplayPort main link has been trained, wherein said performance of MCCS operations activates said video display and selects said individual source device for operation without the performance of an initiating action or an intervention action by a user.

2. The information handling system according to claim 1, wherein said control logic is operable to transfer said second data stream in accordance with the VESA DisplayPort standard.

3. The information handling system according to claim 1, wherein said second data stream of non-video control data is used to perform read/write operations.

4. The information handling system of claim 1, wherein said second data stream of non-video control data is used to control the plurality of source devices.

5. A method of managing data transfer between an information handling system and a source device, comprising:

using data processing logic configured to process a first data stream of video data for a video display and a second data stream of non-video control data for a plurality of source devices, wherein said plurality of source devices are configured to transfer said video data to said video display;

using a data transfer interface comprising a plurality of data channels, said data transfer interface operably coupled to said video display and said plurality of source devices, wherein said data transfer interface comprises a Video Electronics Standards Association (VESA) DisplayPort interface and said plurality of data channels comprises a VESA DisplayPort main link and a VESA DisplayPort auxiliary channel; and

using control logic configured to use a first subset of said plurality of data channels to transfer said first data stream to said video display and to use a second subset of said plurality of data channels to transfer said second data stream to said plurality of source devices;

wherein said control logic is used to perform Extended Display Identification Data (EDID) read operations on said video display to retrieve its EDID information upon activation of an individual source device of the plurality of source devices, and

wherein said EDID information is used by said individual source device to perform DisplayPort Configuration (DPCD) read operations to train said VESA DisplayPort main link for the conveyance of said video data and said non-video control data between said video display and said individual source device;

wherein said auxiliary channel is configured to transfer said second data stream of non-video control data in accordance with VESA monitor command control set (MCCS) parameters; and

MCCS operations are performed once said VESA DisplayPort main link has been trained, wherein said performance of MCCS operations activates said video display and selects said individual source device for operation without the performance of an initiating action or an intervention action by a user.

6. The method according to claim 5, wherein said control logic is operable to transfer said second data stream in accordance with the VESA DisplayPort standard.

7. The method according to claim 5, wherein said second data stream of non-video control data is used to perform read/write operations.

8. The method of claim 5, wherein said second data stream of non-video control data is used to control the plurality of source devices.

9. A system for managing data transfer between an information handling system and a plurality of source devices, comprising:

a data transfer interface comprising a plurality of data channels, wherein said data transfer interface is configured to be coupled to said information handling system, said plurality of source devices and a video display, said data transfer interface comprising a Video Electronics Standards Association (VESA) DisplayPort interface and said plurality of data channels comprising a VESA DisplayPort main link and a VESA DisplayPort auxiliary channel; and

control logic configured to use a first subset of said plurality of data channels to transfer a first data stream of video data to said video display and to use a second subset of said plurality of data channels to transfer a second data stream of non video control data to said plurality of source devices, wherein said plurality of source devices are configured to transfer said video data to said video display;

wherein said control logic is used to perform Extended Display Identification Data (EDID) read operations on said video display to retrieve its EDID information upon activation of an individual source device of the plurality of source devices, and

wherein said EDID information is used by said individual source device to perform DisplayPort Configuration (DPCD) read operations to train said VESA DisplayPort main link for the conveyance of said video data and said non-video control data between said video display and said individual source device;

wherein said auxiliary channel is configured to transfer said second data stream of non-video control data in accordance with VESA monitor command control set (MCCS) parameters; and

MCCS operations are performed once said VESA DisplayPort main link has been trained, wherein said performance of MCCS operations activates said video display and selects said individual source device for operation without the performance of an initiating action or an intervention action by a user.

10. The system according to claim 9, wherein said control logic is operable to transfer said second data stream in accordance with the VESA DisplayPort standard.

11. The system according to claim 9, wherein said second data stream of non-video control data is used to control the plurality of source devices.