Methods and devices for daisy chain CE device power save modes

• US 8,355,327 B2
• Filed: 08/17/2008
• Issued: 01/15/2013
• Est. Priority Date: 02/07/2007
• Status: Active Grant

• Current Assignee: Valens Semiconductor Ltd.
• Original Assignee: Valens Semiconductor Ltd.
• Inventors: Lida, Eyran, Avrahami, Avi, Benzaray, Alon, Banet, Nadav, Risling, Micha, Eyal, Massad, Brunin, Zeev
• Primary Examiner(s): PARK, JUNG H
• Application Number:
  US12/193,007
• Publication Number:
  US 20080304433A1
• Time in Patent Office: 1,612 Days
• Field of Search: 370/230, 370/235, 370/252, 370/338, 370/392, 370/401, 375/240.01, 709/203, 709/218, 709/219, 709/231
• US Class Current: 370/235
• CPC Class Codes: G09G 2330/021 Power management, e.g. power saving
• CPC Class Codes: G09G 2370/04 Exchange of auxiliary data, i.e. other than image data, between monitor and graphics controller
• CPC Class Codes: G09G 2370/12 Use of DVI or HDMI protocol in interfaces along the display data pipeline
• 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
• CPC Class Codes: G09G 5/12 Synchronisation between the display unit and other units, e.g. other display units, video-disc players
• CPC Class Codes: H04N 21/43615 Interfacing a Home Network, e.g. for connecting the client to a plurality of peripherals home Audio Video Interoperability [HAVI] data switching networks H04L12/2805
• CPC Class Codes: H04N 21/4363 Adapting the video stream to a specific local network, e.g. a Bluetooth® network
• CPC Class Codes: H04N 21/43632 involving a wired protocol, e.g. IEEE 1394 high-speed IEEE 1394 serial bus H04L12/40052
• CPC Class Codes: H04N 21/4436 Power management, e.g. shutting down unused components of the receiver power management in computer systems G06F1/3203; hibernate or awake process in computer systems G06F9/4418
• CPC Class Codes: H04N 21/6332 directed to client
• CPC Class Codes: H04N 21/6377 directed to server one-way streaming services wherein the source is controlled by the destination H04L65/613
• CPC Class Codes: H04N 21/643 Communication protocols network streaming protocols, e.g. real-time transport protocol [RTP] or real-time control protocol [RTCP], H04L65/65
• CPC Class Codes: H04N 7/10 Adaptations for transmission by electrical cable H04N7/12 takes precedence

Abstract

A daisy chain device including a first active mode of operation and a second low power mode of operation. In the first active mode of operation the daisy chain device supplies or receives multimedia data containing at least two types of data. In the second low power mode of operation the daisy chain device relays only predefined data types and consumes less power. Wherein the daisy chain connection includes wires and the transmissions in the different modes of operation are over the same wires.

Claims

1. A wired daisy chain mechanism comprising at least first and second multi data type communication link transceivers;

each multi data type communication link transceiver is configured to operate according to at least two modes of operation;

in an active mode of operation, the transceiver is operative to communicate a first stream associated with a first set of data types;

in a first low-power partial-functionality (LPPF) mode of operation, the transceiver is operative to communicate a second stream associated with a second set of data types;

the multi data type communication link comprises wires, and the first and second transceivers are configured to transmit over the same wires during the active mode of operation and the first LPPF mode of operation;

wherein the power consumption in the active mode of operation is higher than the power consumption in the first LPPF mode of operation, the bandwidth of the first stream is significantly higher than the bandwidth of the second stream, the first and second sets of data types have at least one data type in common, and each of the multi data type communication link transceivers is capable of changing its mode of operation according to a request from its link partner.

2. The daisy chain mechanism of claim 1, wherein the configurations of the daisy chain mechanism are dynamically selected from the group of:

first and second multi data type communication link transceivers operating in the active mode of operation, first and second multi data type communication link transceivers operating in the first LPPF mode of operation, the first multi data type communication link transceiver operating in the active mode of operation and the second multi data type communication link transceiver operating in the first LPPF mode of operation, the first multi data type communication link transceiver operating in the first LPPF mode of operation and the second multi data type communication link transceiver operating in the active mode of operation, or a combination thereof.

3. The daisy chain mechanism of claim 1, wherein the changing of the mode of operation according to the request from its link partner includes changing of the mode of operation according an implicit request inferred from analyzing the mode of operation of its link partner.

4. The daisy chain mechanism of claim 1, wherein the multi data type communication link transceivers are multi stream multi data type communication link transceivers.

5. The daisy chain mechanism of claim 1, further comprising a configuration wherein the first and second multi data type communication link transceivers operate in the active mode of operation, whereby the daisy chain mechanism relays stream between its multi data type communication link ports in a third an additional mode of operation.

6. The daisy chain mechanism of claim 5, wherein the third stream is associated with a third set of data types including at least one data type in common with the first set of data types.

7. The daisy chain mechanism of claim 5, wherein the first and second multi data type communication link transceivers are multi stream multi data type communication link transceivers.

8. A CE device comprising a multimedia related unit and a wired daisy chain mechanism, the daisy chain mechanism comprising first and second multi data type communication link transceivers;

each multi data type communication link transceiver is configured to operate according to at least two modes of operation;

in an active mode of operation, the transceiver is operative to transmit a first stream associated with a first set of data types; and

in a first low-power partial-functionality (LPPF) mode of operation, the transceiver is operative to transmit a second stream associated with a second set of data types;

the multi data type communication link comprises wires, and the first and second transceivers are configured to transmit over the same wires during the active mode of operation and the first LPPF mode of operation;

wherein the power consumption in the active mode of operation is higher than the power consumption in the first LPPF mode of operation, the bandwidth of the first stream is significantly higher than the bandwidth of the second stream, the first and second sets of data types have at least one data type in common, and the multimedia related unit is capable of staying in a standby mode of operation while the daisy chain mechanism changes its configuration.

9. The CE device of claim 8, wherein dynamic configurations of the daisy chain mechanism are selected from the group of:

first and second multi data type communication link transceivers operating in the active mode of operation, first and second multi data type communication link transceivers operating in the first LPPF mode of operation, the first multi data type communication link transceiver operating in the active mode of operation and the second multi data type communication link transceiver operating in the first LPPF mode of operation, the first multi data type communication link transceiver operating in the first LPPF mode of operation and the second multi data type communication link transceiver operating in the active mode of operation, or a combination thereof.

10. The CE device of claim 8, wherein the wires are a cable selected from the group of:

Category 5 cable (CAT5), CAT5e, CAT6, CAT6a, or CAT7.

11. The CE device of claim 10, wherein the first stream comprises uncompressed high definition digital video.

12. The CE device of claim 10, wherein the CE device supports one or more of the following interfaces:

Digital Visual Interface (DVI) High-Definition Multimedia Interface (HDMI), or DisplayPort.

13. The CE device of claim 10, wherein the multimedia device is selected from the group of:

a display device, a multimedia source device, a video source device, or an audio source device.

14. The CE device of claim 10, wherein the first and second multi data type communication link transceivers are multi stream multi data type communication link transceivers.

15. The CE device of claim 8, wherein the multi data type communication link comprises four pairs of wires, the active mode of operation transmits uncompressed high definition digital video over the four pairs of wires, and the first LPPF mode of operation transmits over a subset of the wires.

16. The CE device of claim 8, wherein the multi data type communication link transceivers further comprise a second LPPF mode of operation operative to transmit a third stream associated with a third set of data types, wherein the power consumption in the second LPPF mode of operation is higher than the power consumption in the first LPPF mode of operation and lower than the power consumption in the active mode of operation, and the third stream comprises at least one data type in addition to the data types associated with the second stream.

17. The CE device of claim 16, wherein the dynamic configurations of the daisy chain mechanism are selected from the various combinations of the modes of operation of the multi data type communication link transceivers.

18. The CE device of claim 14, wherein the mode of operation is determined according to the required functionality of the CE device.

19. A daisy chain device comprising a multi data type communication link transceiver coupled to a daisy chain connection;

in an active mode of operation, the transceiver is configured to relay multimedia data containing at least two types of data;

in a first low power mode of operation, the transceiver is configured to relay data containing only predefined data types and consume less power compared with power it consume while operating in the active mode of operation;

wherein the daisy chain connection comprises wires, and the transceiver is configured to relay the multimedia data and the data over the same wires; and

while operating in either the active mode of operation or the first low power mode of operation, the daisy chain device is able to initiate a change in mode of operation of its link partner.

20. The daisy chain device of claim 19, wherein the transceiver is configured to relay a smaller number of data types in the first low power mode of operation compared with the number of data types relayed in the active mode of operation.

21. The daisy chain device of claim 19, wherein the daisy chain device is a source device that operates in the active mode of operation while supplying data.

22. The daisy chain device of claim 19, wherein the daisy chain device is a display device that operates in the active mode of operation while displaying received data.

23. The daisy chain device of claim 19, wherein the wires are a cable selected from the group of:

Category 5 cable (CAT5), CAT5e, CAT6, CAT6a, or CAT7.

24. The daisy chain device of claim 23, wherein the daisy chain device supports one or more of the following interfaces:

Digital Visual Interface (DVI), High-Definition Multimedia Interface (HDMI), or DisplayPort.