Source: http://www.google.com/patents/US7613300?dq=5,742,768
Timestamp: 2014-03-11 23:34:00
Document Index: 534781400

Matched Legal Cases: ['Application No. 60', 'Application No. 60', 'Application No. 60', 'Application No. 60', 'Application No. 60', 'Application No. 200405336', 'Application No. 200401969', 'Application No. 200401969', 'Application No. 200410047784', 'Application No. 200410038432', 'Application No. 200410038546', 'application No. 200410044503', 'Application No. 200410071497', 'Application No. 04255786', 'Application No. 04252205', 'Application No. 04251582', 'Application No. 04252056', 'Application No. 04252202', 'Application No. 04252057', 'Application No. 04252203', 'Application No. 04252054', 'Application No. 04255611', 'Application No. 04251581', 'Application No. 04252054', 'Application No. 04252056', 'Application No. 04252057', 'Application No. 04252202', 'Application No. 04252203', 'Application No. 04255609', 'Application No. 04252055', 'Application No. 04255610', 'Application No. 200410044503', 'Application No. 200410043419', 'Application No. 200410045686', 'Application No. 200410087460', 'Application No. 04252205', 'Application No. 200410038545', 'Application No. 200410095171', 'Application No. 200410043419', 'Application No. 200410071498', 'Application No. 2004100950502', 'Application No. 200410095171', 'Application No. 200410044503', 'Application No. 04255786', 'Application No. 08153726', 'Application No. 08155263', 'Application No. 08153724', 'Application No. 200405336', 'Application No. 08155262']

Patent US7613300 - Content-protected digital link over a single signal line - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsA packet based high bandwidth copy protection method is described that includes the following operations. Forming a number of data packets at a source device, encrypting selected ones of the data packets based upon a set of encryption values, transmitting the encrypted data packets from the source device...http://www.google.com/patents/US7613300?utm_source=gb-gplus-sharePatent US7613300 - Content-protected digital link over a single signal lineAdvanced Patent SearchPublication numberUS7613300 B2Publication typeGrantApplication numberUS 11/747,839Publication dateNov 3, 2009Filing dateMay 11, 2007Priority dateSep 26, 2003Fee statusPaidAlso published asCN101304420A, CN101304420B, EP1990999A2, EP1990999A3, US20080013725Publication number11747839, 747839, US 7613300 B2, US 7613300B2, US-B2-7613300, US7613300 B2, US7613300B2InventorsOsamu KobayashiOriginal AssigneeGenesis Microchip Inc.Export CitationBiBTeX, EndNote, RefManPatent Citations (108), Non-Patent Citations (98), Classifications (25), Legal Events (2) External Links: USPTO, USPTO Assignment, EspacenetContent-protected digital link over a single signal lineUS 7613300 B2Abstract A packet based high bandwidth copy protection method is described that includes the following operations. Forming a number of data packets at a source device, encrypting selected ones of the data packets based upon a set of encryption values, transmitting the encrypted data packets from the source device to a sink device coupled thereto, decrypting the encrypted data packets based in part upon the encryption values, and accessing the decrypted data packets by the sink device.
1. A packet based high bandwidth copy protection (HDCP) method comprising:
connecting a multimedia source device and a multimedia sink device by way of a single line cable;
setting a hot plug detect (HPD) signal to a HPD HI value by the multimedia sink device;
passing the HPD HI signal from the multimedia sink device to the multimedia source device;
configuring the single line cable as an auxiliary channel by the multimedia source device in response to the HPD HI signal;
synchronizing the multimedia source device and the multimedia sink device;
setting the HPD signal to an HPD LO signal by the multimedia sink;
configuring the single line cable as a main link by the multimedia source device after the source device and the sink device are synchronized;
forming an HDCP encrypted audio/video (A/V) data stream by:
encrypting selected data packets;
generating a control packet at the source device used for identifying the selected encrypted data packets; and
combining at least the control packet and the identified encrypted data packets;
passing the HDCP encrypted audio/video (A/V) data stream from the multimedia source device to the multimedia sink device by way of the single line cable; and
decrypting only those packets identified by the control packet.
2. A method as recited in claim 1, wherein the synchronizing comprises:
configuring the single line cable as an auxiliary channel by the multimedia source device in response to the HPD HI signal; and
passing synchronization information between the multi-media source device and the multimedia sink device by way of the single line cable as the auxiliary channel.
setting the HPD signal to an HPD LO signal by the multimedia sink device after the multimedia source device and the multimedia sink device are synchronized.
if the source device and the sink device fall out of synchronization,
setting the HPD signal to HPD HI by the sink device;
halting the A/V data stream by the source device;
configuring the single line cable to the auxiliary channel by the source device in response to HPD HI; and
re-synchronizing the source device and the sink device.
forming a number of data packets at the source device;
encrypting the data packets based upon a set of encryption values;
transmitting the encrypted data packets from the source device to a sink device coupled thereto as the A/V data stream;
decrypting the encrypted data packets based in part upon the encryption values; and
accessing the decrypted data packets by the sink device.
6. A method as recited in claim 5, wherein the source device is a video source and wherein the sink device is a video display and wherein the number of data packets include some audio data packets and some video data packets.
7. A method as recited in claim 6, wherein the encryption/decryption control signals include a Vsync, an Hsync, and a CNTL3.
8. A method as recited in claim 7, wherein each of the data packets is identified by associated with a particular control packet as being either encrypted or not encrypted.
9. A method as recited in claim 8, wherein when the CNTL3 is active, then the corresponding data packet is encrypted and vice-versa.
10. A method as recited in claim 1, wherein the single line cable is a co-ax cable.
11. A method as recited in claim 10, wherein the single line cable is a CAT-5 cable.
12. A system for providing high bandwidth copy protection in a packet based system over a cable having only a single line, comprising:
a source unit arranged to provide a number of data packets having a hot plug detect (HPD) input node connected to the single line cable by way of a source side bypass line; and
a sink unit coupled to the source unit arranged to receive the data packets from the source unit over the single line cable, wherein the source unit and the sink unit are AC coupled by way of a source side coupling capacitor and a sink side coupling capacitor, and wherein the sink unit includes an HPD output node connected to the single wire cable by way of a sink side bypass line, wherein the source side bypass line and the sink side bypass line provide a DC signal path between the sink device and the source device, wherein the sink device sets a hot plug detect (HPD) signal to a HPD HI value when the source device and the sink device are not in synch that is communicated to the source device over the single wire cable configured as an auxiliary channel by the source device and wherein, when the source and the sink device are in sync, the sink device sets the HPD signal to HPD LO and the source device responds by configuring the single line cable as a main link, forming an HDCP encrypted audio/video (A/V) data stream by encrypting selected data packets, generating a control packet at the source device used for identifying the selected encrypted data packets, and combining at least the control packet and the identified encrypted data packets, and sending an encrypted audio/video data stream over the single line cable to the sink device.
an encryption unit coupled to the source unit arranged to encrypt selected ones of the data packets sent from the source unit to the sink unit;
a decryption unit coupled to the sink unit arranged to decrypt the encrypted data packets; and
an encryption/decryption values generator arranged to provide a set of encryption/decryption values used to encrypt and decrypt the appropriate data packets.
14. A system as recited in claim 13, wherein the source unit is an audio/video unit arranged to provide audio type data packets and/or video type data packets.
15. A system as recited in claim 14, wherein the sink unit is a display unit arranged to display processed ones of the video data packets.
16. A system as recited in claim 15, wherein the display unit includes a number of speakers arranged to transmit audio signals based upon processed ones of the audio data packets.
17. A system as recited in claim 16, wherein the set of encryption/decryption control signals include Vsynch, Hsynch corresponding to the video data packets.
18. A system as recited in claim 17, wherein the set of encryption/decryption control signal further includes CNTL3 to flag those data packets that are encrypted.
19. Computer program product executable by a processor, comprising:
computer code for connecting a multimedia source device and a multimedia sink device by way of a single line cable;
computer code for setting a hot plug detect (HPD) signal to a HPD HI value by the multimedia sink device;
computer code for passing the HPD HI signal from the multimedia sink device to the multimedia source device;
computer code for configuring the single line cable as an auxiliary cable by the multimedia source device in response to the HPD HI signal;
computer code for synchronizing the multimedia source device and the multimedia sink device;
computer code for setting the HPD signal to an HPD LO signal by the multimedia sink device after the multimedia source device and the multimedia sink device are synchronized;
computer code for configuring the single line cable as a main link by the multimedia source device after the source device and the sink device are synchronized; and
computer code for forming an HDCP encrypted audio/video (A/V) data stream by:
decrypting only those packets identified by the control packet;
computer code for passing the audio/video data stream from the multimedia source device to the multimedia sink device by way of the single line cable;
computer code for decrypting only those packets identified by the control packet; and
20. Computer program product as recited in claim 19, further comprising:
computer code for determining if the source device and the sink device fall out of synchronization,
computer code for setting the HPD signal to HPD HI by the sink device;
computer code for halting the A/V data stream by the source device;
computer code for configuring the single wire cable to the auxiliary channel by the source device in response to HPD HI; and
computer code for re-synchronizing the source device and the sink device.
21. A Computer chip configured to:
set a hot plug detect (HPD) signal to a HPD HI;
pass the HPD HI signal to a multimedia source device;
configure a single line cable connecting the multimedia source device and a multimedia sink as an auxiliary channel in response to the HPD HI signal;
synchronize the multimedia source device and the multimedia sink device;
set the HPD signal to an HPD LO signal by the multimedia sink;
configure the single line cable as a main link by the multimedia source device after the source device and the sink device are synchronized;
form an HDCP encrypted audio/video (A/V) data stream by:
pass the HDCP encrypted audio/video (A/V) data stream from the multimedia source device to the multimedia sink device by way of the single line cable; and
22. A method as recited in claim 1, wherein the configuring the single line cable as an auxiliary channel includes enabling an auxiliary channel transceiver and disabling a main link transmitter, wherein the synchronizing includes utilizing the auxiliary channel transceiver, and wherein the configuring the single line cable as a main link includes disabling the auxiliary channel transceiver and enabling a main link transmitter, wherein the auxiliary channel transceiver transmits and/or receives side-band signals over a bi-directional channel and wherein the main link transmitter transmits information over a uni-directional link.
23. A system as recited in claim 12, wherein the source unit includes an auxiliary channel transceiver and main link transmitter, wherein the sink unit includes an auxiliary channel transceiver and main link receiver, and wherein the source device responds to the HPD LO signal by disabling the auxiliary channel transceiver and enabling the main link transmitter, wherein the auxiliary channel transceiver transmits and/or receives side-band signals over a bi-directional channel and wherein the main link transmitter transmits information over a uni-directional link.
24. A computer program product as recited in claim 19, wherein the computer code for configuring the single line cable as an auxiliary channel includes computer code for disabling a main link transmitter and enabling an auxiliary channel transceiver, wherein the auxiliary channel transceiver transmits and/or receives side-band signals over a bi-directional channel and wherein the main link transmitter transmits information over a uni-directional link.
25. The computer chip of claim 21, further comprising an auxiliary channel transceiver and main link transmitter, wherein the auxiliary channel transceiver transmits and/or receives side-band signals over a bi-directional channel and wherein the main link transmitter transmits information over a uni-directional link.
CROSS REFERENCE TO RELATED APPLICATIONS This patent application is a continuation-in-part of U.S. patent application Ser. No. 10/762,680 filed Jan. 21, 2004 entitled �PACKET BASED HIGH DEFINITION HIGH-BANDWIDTH DIGITAL CONTENT PROTECTION� by Kobayashi that, in turn, takes priority under 35 U.S.C. 119(e) to U.S. Provisional Patent Application No. 60/506,193 filed Sep. 26, 2003 entitled �PROVIDING HIGH DEFINITION COPY PROTECTION IN A PACKET BASED DATA STREAM� by Kobayashi, each of which is incorporated by reference in its entirety for all purposes. This application is also related to (i) U.S. patent application Ser. No. 10/726,794 filed Dec. 2, 2003 entitled �PACKET BASED VIDEO DISPLAY INTERFACE AND METHODS OF USE THEREOF� by Kobayashi that, in turn, takes priority under 35 U.S.C. 119(e) to (ii) U.S. Provisional Patent Application No. 60/467,804 filed May 1, 2003 entitled �DIGITAL/ANALOG VIDEO INTERCONNECT AND METHODS OF USE THEREOF� by Kobayashi, (iii) U.S. Provisional Patent Application No. 60/504,060 filed Sep. 18, 2003 entitled �DIGITAL/ANALOG VIDEO INTERCONNECT AND METHODS OF USE THEREOF� by Kobayashi, (iv) U.S. Provisional Patent Application No. 60/474,085 filed May 28, 2003 entitled �DIGITAL/ANALOG VIDEO INTERCONNECT AND METHODS OF USE THEREOF� by Kobayashi, and (v) U.S. Provisional Patent Application No. 60/474,084 filed May 28, 2003 entitled �SIMPLE ENUMERATION METHOD FOR THE LINK CLOCK RATE AND THE PIXEL/AUDIO CLOCK RATE� by Kobayashi, each of which is hereby incorporated by reference herein in their entirety. This application is also related to the following U.S. patent applications each of which is herein incorporated by reference, (i) U.S. patent application Ser. No. 10/726,802 entitled �METHOD OF ADAPTIVELY CONNECTING A VIDEO SOURCE AND A VIDEO DISPLAY� by Kobayashi; (ii) U.S. patent application Ser. No. 10/726,438 that issued as U.S. Pat. No. 7,068,686 and continuing U.S. patent application Ser. No. 11/291,015 that issued as U.S. Pat. No. 7,177,329, both entitled �METHOD AND APPARATUS FOR EFFICIENT TRANSMISSION OF MULTIMEDIA DATA PACKETS� by Kobayashi; (iii) U.S. patent application Ser. No. 10/726,440 entitled �METHOD OF OPTIMIZING MULTIMEDIA PACKET TRANSMISSION RATE� by Kobayashi; (iv) U.S. patent application Ser. No. 10/727,131 entitled �USING AN AUXILIARY CHANNEL FOR VIDEO MONITOR TRAINING� that issued as U.S. Pat. No. 7,088,741 by Kobayashi; (v) U.S. patent application Ser. No. 10/726,350 entitled �TECHNIQUES FOR REDUCING MULTIMEDIA DATA PACKET OVERHEAD� by Kobayashi; (vi) U.S. patent application Ser. No. 10/726,362 entitled �PACKET BASED CLOSED LOOP VIDEO DISPLAY INTERFACE WITH PERIODIC STATUS CHECKS� by Kobayashi; (vii) U.S. patent application Ser. No. 10/726,895 entitled �MINIMIZING BUFFER REQUIREMENTS IN A DIGITAL VIDEO SYSTEM� by Kobayashi; and (viii) U.S. patent application Ser. No. 10/726,441 entitled �VIDEO INTERFACE ARRANGED TO PROVIDE PIXEL DATA INDEPENDENT OF A LINK CHARACTER CLOCK� by Kobayashi; and (ix) U.S. patent application Ser. No. 10/726,934 entitled �ENUMERATION METHOD FOR THE LINK CLOCK RATE AND THE PIXEL/AUDIO CLOCK RATE� by Kobayashi that issued as U.S. Pat. No. 6,992,987. This application is also related to the following co-pending applications: (x) U.S. patent application Ser. No. 10/909,103 filed Jul. 29, 2004 entitled �USING PACKET TRANSFER FOR DRIVING LCD PANEL DRIVER ELECTRONICS� by Kobayashi; (xi) U.S. patent application Ser. No. 10/909,027 filed Jul. 29, 2004 entitled �BYPASSING PIXEL CLOCK GENERATION AND CRTC CIRCUITS IN A GRAPHICS CONTROLLER CHIP� by Kobayashi, and (xi) U.S. patent application Ser. No. 10/909,085 filed Jul. 29, 2004 entitled �PACKET BASED STREAM TRANSPORT SCHEDULER AND METHODS OF USE THEREOF� by Kobayashi, each of which is incorporated by reference in their entireties.
HDCP protocol uses the status of DE, Hsync, Vsync and another control signal, called CNTL3, to advance its state machine. The DE, Hsync, and Vsync signals are timing signals associated with raster video transmitted in a �streaming� manner. In a streaming transfer, the pixel data is transferred at pixel rate and the ratio of blanking period to data period is preserved. In case of a packet transfer, these timing signals may not be present. Only the pixel data may be transferred in the packet stream, while timing information is communicated in a different way.
It would be advantageous from a commercial cost standpoint to be able to support HDCP protocol over cheaper type cables such as coax cable, cat 5 cable, and so on. Unfortunately, however, in order to properly implement the HDCP protocol, a sideband handshake is required in order to at least synchronize the source and the sink devices which in conventional arrangements would require at least two separate data lines. In this way, coax cable, cat 5 cable and the like is unsuitable for implementing the HDCP protocol in a conventional manner.
Therefore, what is required is a way to support high-definition copy protection that is compatible with existing high definition copy protection protocols such as HDCP over single cable, such as coax cable.
SUMMARY OF THE INVENTION What is provided, therefore, is a packet-based digital transmission medium and protocol that supports high definition copy protection that is backwards compatible with existing high definition copy protection protocols such as HDCP that can be implemented over a single line cable such as co-ax cable or CAT-5 cable. In one embodiment of the invention, a packet based high bandwidth copy protection method is described that includes the following operations. Connecting a multimedia source device and a multimedia sink device by way of a single line cable; synchronizing the multimedia source device and the multimedia sink device over the single line cable; configuring the single line cable as a main link by the multimedia source device; and passing an HDCP encrypted audio/video (A/V) data stream from the multimedia source device to the multimedia sink device by way of the single line cable.
In another embodiment, a system for providing high bandwidth copy protection in a packet based system over a single line cable. The system includes, at least, a source unit arranged to provide a number of data packets having a hot plug detect (HPD) input node connected to the single line cable by way of a source side bypass line, and a sink unit coupled to the source unit arranged to receive the data packets from the source unit over the single line cable, wherein the source unit and the sink unit are AC coupled by way of a source side coupling capacitor and a sink side coupling capacitor, and wherein the sink unit includes an HPD output node connected to the single line cable by way of a sink side bypass line, wherein the source side bypass line and the sink side bypass line provide a DC signal path between the sink device and the source device, wherein the sink device sets a hot plug detect (HPD) signal to a HPD HI value when the source device and the sink device are not in synch that is communicated to the source device over the single line cable configured as an auxiliary channel by the source device and wherein, when the source and the sink device are in sync, the sink device sets the HPD signal to HPD LO and the source device responds by configuring the single line cable as a main link and sending an encrypted audio/video data stream over the single line cable to the sink device.
In yet another embodiment, computer program product for providing a packet based high bandwidth copy protection is disclosed that includes, at least, computer code for connecting a multimedia source device and a multimedia sink device by way of a single line cable; computer code for setting a hot plug detect (HPD) signal to a HPD HI value by the multimedia sink device; computer code for passing the HPD HI signal from the multimedia sink device to the multimedia source device; computer code for configuring the single line cable as an auxiliary cable by the multimedia source device in response to the HPD HI signal; computer code for synchronizing the multimedia source device and the multimedia sink device; computer code for setting the HPD signal to an HPD LO signal by the multimedia sink device after the multimedia source device and the multimedia sink device are synchronized; computer code for configuring the single line cable as a main link by the multimedia source device; computer code for passing an audio/video data stream from the multimedia source device to the multimedia sink device by way of the single line cable; and computer readable medium for storing the computer code.
FIG. 5 illustrates a system in accordance with another embodiment of the invention.
FIGS. 6A-6B illustrate a flowchart detailing a process in accordance with an embodiment of the invention.
The present invention provides for high definition high bandwidth copy protection over a single line cable, such as coax cable. In one embodiment of the invention, a source and sink each of which are Hot Plug Detect (HPD) capable are AC coupled by way of a single line cable, such as coax cable. When the sink device has determined that the source device is connected thereto, the sink device sets an HPD signal to an HPD HI value. In response to the HPD signal being set to HI, the source device initiates a synchronization process with the sink device by configuring the single line cable as an auxiliary channel and requesting synchronization information from the sink device. The sink device responds to the source device request by forwarding appropriate synchronization information (such as EDID information, and HDCP authentication information) over the single line cable (configured to act as an auxiliary, or side band, channel). If all information provided by the sink device is deemed appropriate by the sink device, the sink device re-sets the HPD signal to LO and the source device responds by configuring the single line cable as a main link and proceeds to transfer an audio/video (A/V) data stream over the single line cable to the sink device. If at any time the sink device determines that the synchronization has failed, then the sink device re-sets the HPD signal to HI and is then forwarded to the source device. In response to the HPD signal being set HI, the source device halts the transmission of the A/V data stream and the sink device initiates re-synchronization with the source device.
FIG. 2 shows an encryption system 200 for encrypting audio/video content suitable for use with the system 100 described with respect to FIG. 1. As shown in FIG. 2, a video source 202 is arranged to provide a number of data streams such as the data streams 110 and 112. By utilizing a number of data streams, the system 200 is capable of transmitting video data, for example, consistent with any of a number of video formats concurrently. For example, the data stream 110 is formed of video data consistent with 1024�768 at 60 Hz whereas the data stream 112 is formed of video data consistent with 640�480 at 75 Hz, and so on. In order for a receiver 204 (such as a monitor) to reconstruct the video in the appropriate format, the data streams include in addition the appropriate video data associated attribute data that is used by the receiver to reconstruct the video in the appropriate format.
Accordingly, the video source 202 includes a number of buffers 206 each of which is used to buffer an associated one of the video data streams. Each of the buffers is, in turn, coupled to a multiplexer 208 that is used to select a particular one of the data streams for transmission to a packetizer 210. The packetizer 210 parses the incident data stream into an associated number of data packets by incorporating a packet ID, optionally performing error correction, and attaching a time stamp and any of the attributes deemed important or necessary for the correct reconstruction of the video raster by the receiver 404. An encryption control generator unit 212 applies an appropriate encryption algorithm to each of the data packets based at least by inserting a control packet that conveys signals such as Hsync, Vsync, and a particular control character CNTL3 used to flag those data packets that are encrypted (and conversely those data packets that are not encrypted).
In accordance with an embodiment of the invention, the resulting encrypted data stream 214 (a particular example of which is shown in FIG. 3 as a data stream 300) is formed of a number of data packets. The data stream 300 includes a number of control packets 302 used to mark those video data packets that are encrypted (or not encrypted) as the case may be. Each video packet has an associated header 304 that includes, in part, the attribute data described above associated with the video data packet 306. For example, in the case shown in FIG. 3, the data stream 300 includes data packets for the data stream 110 and the data stream 112 conjoined into the data stream 300 such that the traffic between the video source 202 and the receiver 204 is consistent with a constant link environment.
It should be noted that in the described embodiment, the data stream 300 is time domain multiplexed, those data packets associated with the data stream 110 have a longer duration than those associated with the data stream 112. In these cases, a time-base recovery (TBR) unit 216 within the receiver 204 regenerates the stream's original native rate using time stamps embedded in the main link data packets, if necessary. Referring back to FIG. 2, at the receiver 404, a deserializer unit 218 receives the encrypted data stream 300 that provides input to a decoder unit 220 and a depacketizer 222. The decoder 220 decodes the control packet, thus feeding Hsync, Vsync, and a particular control character CNTL3 provided to a decryption engine 228 that was previously used to for encryption.
FIG. 4 illustrates a system 400 employed to implement the invention. Computer system 400 is only an example of a graphics system in which the present invention can be implemented. System 400 includes central processing unit (CPU) 410, random access memory (RAM) 420, read only memory (ROM) 425, one or more peripherals 430, graphics controller 460, primary storage devices 440 and 450, and digital display unit 470. CPUs 410 are also coupled to one or more input/output devices 490 that may include, but are not limited to, devices such as, track balls, mice, keyboards, microphones, touch-sensitive displays, transducer card readers, magnetic or paper tape readers, tablets, styluses, voice or handwriting recognizers, or other well-known input devices such as, of course, other computers. Graphics controller 460 generates analog image data and a corresponding reference signal, and provides both to digital display unit 470. The analog image data can be generated, for example, based on pixel data received from CPU 410 or from an external encode (not shown). In one embodiment, the analog image data is provided in RGB format and the reference signal includes the VSYNC and HSYNC signals well known in the art. However, it should be understood that the present invention can be implemented with analog image, data and/or reference signals in other formats. For example, analog image data can include video signal data also with a corresponding time reference signal.
FIG. 5 illustrates a system 600 in accordance with another embodiment of the invention. System 600 includes multimedia source device 602 AC coupled to multimedia sink device 604 by way of single line cable 606 (such as co-ax cable) that can take the form of a single differential pair. Source device 602 includes main link transmitter (TX) 608 arranged to transmit audio-video (AV) stream 610 over uni-directional main link 606. Auxiliary channel transceiver (AUX CH TRX) 612 transmits and/or receives side-band signal SB (such as control packets) over bi-directional auxiliary channel 614. Hot plug detect (HPD) monitor 616 monitors whether or not sink device 604 is present. When sink device 604 is present, HPD driver 618 sets HPD signal 620 to a high level, otherwise HPD driver 618 sets HPD signal 620 to a low level. In the described embodiment, sink device 604 includes main link receiver (RX) 622 arranged to receive AV stream stream 610 and auxiliary channel transceiver (AUX CH TRX) 624.
Since source device 602 and sink device 604 are AC coupled, coupling capacitors 626 and 628 are used to connect source device 602 and sink device 604 such that only AC signals can pass while any DC signal is blocked. Therefore, by providing a source side Hot Plug Detect (HPD) bypass line 630 from node A to HPD monitor 616 at source device 602 and a sink side HPD bypass line 632 connecting point B to HPD driver 618 at sink device 604, any HPD signal (that is a DC signal) from source device 602 to sink device 604 is blocked by coupling capacitors 626 and 628 from reaching either the source device 602 except by the HPD monitor 616. Therefore any DC signal that passes between multimedia source device 602 and multimedia sink device 604 is blocked by coupling capacitors 626 and 628. In this way, the status of the HPD signal 620 (either high or low) does not affect the main link transport and/or AUX CH transactions.
FIGS. 6A and 6B show a flowchart detailing a process 900 in accordance with an embodiment of the invention. The process 900 begins at 902 by monitoring the HPD signal. When at 902 the HPD signal is LOW, then both the source and the sink are in OFF state at 904, however, when it is detected at 906 that the HPD signal is going from low to high, the source device enables AUX CH TRX and disables Main Link TX at 908 and the sink device enables AUX CH TRX while disabling Main Link RX (referred to as �SETUP� state) at 910. In the SETUP mode, the following AUX CH transactions take place, at 912, EDID read to understand the sink device capability (e.g., display resolution, color depth, audio capability), at 914 DPCD read to understand the Main Link RX capability (e.g. supported link rate) and at 916 authentication for content protection in order to validate the sink device where authentication takes place last. Once the authentication is completed at 918, control is passed to 920 shown in FIG. 6B where the Source Device disables the AUX CH TRX and enables the main link TX at 920 and the Sink Device disables the AUX CH TRX and enables Main Link TX and RX at 922 (this state is called �STREAM TRANSPORT�). In the STREAM TRANSPORT state, the Sink Device verifies the CP synchronization between Source and Sink at 924. In the described embodiment, the verification is performed the sink device verifying a validity of �CP synch bit� transported as part of the AV stream. During the STREAM TRANSPORT state, an AV data stream is sent from the source to the sink at 926 until at 928 the AV stream is complete at which point process 700 stops, otherwise at 930 if and when the CP synch is lost or whenever the Sink Device gets out of STREAM TRANSPORT state at 932, the HPD signal goes low at 934, notifying the Source Device of this state change. If on the other hand, neither CP sync is lost or sink device is out of STREAM TRANSPORT mode, then control is passed back to 926.
Upon HPD turning low at 934, both the Source and Sink Devices go to OFF state at 936. When the HPD signal is driven HIGH by the Sink Device at 938, the Source and Sink Devices return to SETUP mode at 904. Using this method, a content-protected AV stream (or streams) can be transported over a single signal line.
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