Source: http://www.google.de/patents/US8204076?hl=de
Timestamp: 2013-05-21 21:27:00
Document Index: 625561673

Matched Legal Cases: ['Application No. 200401969', 'Application No. 200401973', '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. 10162586', '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. 200410044503', 'Application No. 200410043419', 'Application No. 200410045686', 'Application No. 200410087460', 'Application No. 200410038545', '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. 08153454', 'Application No. 08153726', 'Application No. 08155263', 'Application No. 08153724', 'Application No. 08155262']

Patent US8204076 - Compact packet based multimedia interface - Google PatenteSuche Bilder Maps Play YouTube News Gmail Drive Mehr » Erweiterte Patentsuche | Webprotokoll | Anmelden Erweiterte Patentsuche PatenteA packet based display interface arranged to couple a multimedia source device to a multimedia sink device is disclosed that includes a transmitter unit coupled to the source device arranged to receive a source packet data stream in accordance with a native stream rate, a receiver unit coupled to the...http://www.google.de/patents/US8204076?utm_source=gb-gplus-sharePatent US8204076 - Compact packet based multimedia interface Ver�ffentlichungsnummerUS8204076 B2PublikationstypErteilung Anmeldenummer11/740,859 Ver�ffentlichungsdatum19. Juni 2012Eingetragen26. Apr. 2007 Priorit�tsdatum1. Mai 2003Auch ver�ffentlicht unterCN101295493AEP1986183A1US20070201492US20120229486 ErfinderOsamu KobayashiUrspr�nglich Bevollm�chtigterGenesis Microchip Inc. US-Klassifikation370/464370/289370/465370/503Internationale KlassifikationH04L12/56G06F3/14G06F3/153H04J3/00G09G3/36H04N7/00G09G5/00G09G3/20H04N5/765H04N5/44 UnternehmensklassifikationG09G2370/10G09G2370/042G09G2370/047G06F3/14G09G5/006 Europ�ische KlassifikationG09G 5/00T4G06F 3/14ReferenzenPatentzitate (156)Nichtpatentzitate (136) Referenziert von (1)Externe LinksUSPTO USPTO-Zuordnung EspacenetCompact packet based multimedia interfaceUS 8204076 B2 Zusammenfassung A packet based display interface arranged to couple a multimedia source device to a multimedia sink device is disclosed that includes a transmitter unit coupled to the source device arranged to receive a source packet data stream in accordance with a native stream rate, a receiver unit coupled to the sink device, and a linking unit coupling the transmitter unit and the receiver unit arranged to transfer a multimedia data packet stream formed of a number of multimedia data packets based upon the source packet data stream in accordance with a link rate between the transmitter unit and the receiver unit.
1. A compact packet based multimedia interface arranged to couple a portable multimedia source arranged to provide a reduced set of multimedia formats each at a native multimedia clock rate and a multimedia display; comprising:
a uni-directional main link having no more than two pairs of twisted conductors each pair forming a single communication channel coupling the multimedia source to the multimedia sink arranged to carry a packetized multimedia data stream from the multimedia source to the multimedia display at a link character clock rate that is independent of the native multimedia clock rate so that no time base recovery of the packetized multimedia data stream is necessary, wherein the uni-directional main link is coupled only to a transmitter at the multimedia source and a receiver at the display, wherein neither a transmitted clock signal nor time stamps are utilized at the multimedia sink;
a half duplex, bi-directional auxiliary channel connecting the multimedia source and the display that provides in concert with the uni-directional main link, a secondary communication link between the multimedia source and the display for transferring information between the multimedia source and the display, wherein the half-duplex, bi-directional auxiliary channel is coupled to both a transmitter and a receiver at the multimedia source and both a transmitter and receiver at the display; and
the uni-directional main link and the secondary communication link being physically distinct pairs of twisted conductors and lacking a clock lane.
2. A compact packed based multimedia interface as recited in claim 1, further comprising:
a first connector arrangement arranged to electrically connect the uni-directional main link and the half duplex, bi-directional auxiliary channel to the multimedia source; and
a second connector arrangement arranged to electrically connect the uni-directional main link and the half duplex, bi-directional auxiliary channel to the display and wherein the multimedia data stream has an associated adjustable data stream link rate that is independent of the native multimedia clock rate.
3. A compact packed based multimedia interface as recited in claim 1, wherein the multimedia data stream is isochronous and wherein the information transfer is asynchronous.
4. A compact packed based multimedia interface as recited in claim 1, further comprising:
a hot plug event detector unit arranged to automatically determine when an active sink device is connected to the compact packed based multimedia interface.
5. A compact packed based multimedia interface as recited in claim 1, wherein the information carried by the auxiliary channel includes sync loss information, dropped packets information and the results of training session information.
6. A compact packed based multimedia interface as recited in claim 2, wherein the link character clock rate is adjustable up to about 2.7 Gbps and an associated bandwidth of 270 Mbytes/sec.
7. A compact packed based multimedia interface as recited in claim 1, wherein the source device informs the display device by way of the auxiliary channel of an audio sample rate and a number of bits per sample corresponding to an audio stream.
8. A compact packed based multimedia interface as recited in claim 1, wherein the auxiliary channel supports data transmission rates up to at least 480 Mbs using a self-clocked data signal.
9. A compact packed based multimedia interface as recited in claim 8, wherein when the interface is placed in a multi-master mode, either the multimedia source or the display can be a master device, and wherein serial data in response is passed from a responding slave device to a requesting master device over the auxiliary channel.
10. A compact packed based multimedia interface as recited in claim 9, further comprising:
coupling a portable multimedia source arranged to provide a reduced set of multimedia formats each at a native multimedia clock rate and a multimedia display using a compact packet based multimedia interface, wherein the compact packet based multimedia interface includes a uni-directional main link having no more than two pairs of twisted conductors each pair forming a single communication channel each communication channel arranged to carry a packetized multimedia data stream from the multimedia source to the multimedia display at a link character clock rate that is independent of the native multimedia clock rate so that no time base recovery of the packetized multimedia data stream is necessary, wherein the uni-directional main link is coupled only to a transmitter at the multimedia source and a receiver at the display, wherein neither a transmitted clock signal nor time stamps are utilized at the multimedia display, a half duplex, bi-directional auxiliary channel that provides in concert with the uni-directional main link, a secondary communication link between the multimedia source and the display for transferring information between the multimedia source and the display, wherein the half-duplex, bi-directional auxiliary channel is coupled to both a transmitter and a receiver at the multimedia source and both a transmitter and receiver at the display and a first connector arrangement arranged to electrically connect the uni-directional main link and the half duplex, bi-directional auxiliary channel to the multimedia source and a second connector arrangement arranged to electrically connect the uni-directional main link and the half duplex, bi-directional auxiliary channel to the display; and
passing the packetized multimedia data stream from the multi-media source to the multi-media display at the link character clock rate;
12. A method as recited in claim 11, wherein the multi-media source device is a portable multi-media player.
13. A method as recited in claim 11, wherein the multimedia data stream is isochronous and wherein the information transfer over the auxiliary channel is asynchronous. Beschreibung
SUMMARY OF THE INVENTION A compact packet based multimedia interface arranged to couple a portable multimedia source arranged to provide a reduced set of multimedia formats each at a native multimedia clock rate and a multimedia display is disclosed. The multimedia interface includes, at least, a uni-directional main link having a single lane coupling the multimedia source to the multimedia sink arranged to carry a packetized multimedia data stream from the multimedia source to the multimedia display at a link rate that is independent of the native multimedia clock rate, a half duplex, bi-directional auxiliary channel connecting the multimedia source and the display that provides in concert with the uni-directional main link, a secondary communication link between the multimedia source and the display for transferring information between the multimedia source and the display, and a connector arrangement arranged to electrically connect the uni-directional main link and the half duplex, bi-directional auxiliary channel to the multimedia source and the display.
In another embodiment, a system is disclosed that includes at least the following: a portable multimedia source arranged to provide a reduced set of multimedia formats each at a native multimedia clock rate, a multimedia display, and
a compact packet based multimedia interface arranged to couple the portable multimedia source and the display. The compact packet based multimedia display includes at least a uni-directional main link having a single lane coupling the multimedia source to the multimedia sink arranged to carry a packetized multimedia data stream from the multimedia source to the multimedia display at a link rate that is independent of the native multimedia clock rate, a half duplex, bi-directional auxiliary channel connecting the multimedia source and the display that provides in concert with the uni-directional main link, a secondary communication link between the multimedia source and the display for transferring information between the multimedia source and the display, and a connector arrangement arranged to electrically connect the uni-directional main link and the half duplex, bi-directional auxiliary channel to the multimedia source and the display.
In yet another embodiment, A method is described that includes at least the following operations: coupling a portable multimedia source arranged to provide a reduced set of multimedia formats each at a native multimedia clock rate and a multimedia display using a compact packet based multimedia interface, wherein the compact packet based multimedia interface includes a uni-directional main link having no more than a single lane arranged to carry a packetized multimedia data stream from the multimedia source to the multimedia display at a link rate that is independent of the native multimedia clock rate, a half duplex, bi-directional auxiliary channel that provides in concert with the uni-directional main link, a secondary communication link between the multimedia source and the display for transferring information between the multimedia source and the display, and a connector arrangement arranged to electrically connect the uni-directional main link and the half duplex, bi-directional auxiliary channel to the multimedia source and the display and passing the packetized multimedia data stream from the multi-media source to the multi-media display at the link rate.
FIGS. 30-31 illustrate system based upon the system shown in FIG. 1 that is used to connect multimedia source to multimedia sink (display) by way of compact communication link.
FIG. 32 shows a representative compact main link electrical sub layer and auxiliary channel electrical sub-layer in accordance with an embodiment of the invention.
FIG. 33 shows a representative reduced pin connector in accordance with an embodiment of the invention.
FIG. 34 shows a flowchart detailing a process describing operation of the interface in a multi-master mode in accordance with an embodiment of the invention.
FIG. 30 illustrates system 3000 based upon the system 100 shown in FIG. 1 that is used to connect multimedia source 3002 to multimedia sink (display) 3004 by way of compact communication link 3006. By compact it is meant that communication link 3006 has reduced bandwidth capability and commensurably reduced form factor over communication link 106 described in more detail above. Accordingly, use of compact communication link 3006 is appropriate in those situations where multimedia source 3002 is configured to provide packet based data stream 3008 having a limited number of formats and therefore that requires commensurably less bandwidth. For example, multimedia source 3002 can take the form of a portable video device (portable DVD player, video multi-media player, and so on) that can support video formats such as 480(i,p), 720p, or 1080i (that includes 8-bpc YCbCr (24 bbp), 1920�1080i @ 60 Hz, and 6-bpc RGB (18 bpp), 1680�1050 @60 Hz (WSXGA)) each of which can be accommodated by a single channel or lane since each lane has an associated link rate of up to 2.7 Gbps and an associated bandwidth of 270 Mbytes/sec. In this way, uni-directional main link 3010 included in communication link 3006 used to carry video data stream 3008 can be fabricated using a single pair of twisted conductors forming a single communication channel (shown in FIG. 32 for example). In this way, communication link 3006 can be fabricated using a thin, flexible cable well suited for such portable applications electrically connected to multimedia source 3002 and display 3004 by way of compact connectors 3012 each having a reduced number of pins described in more detail below and shown in FIG. 33.
Communication link 3006 can also include half duplex, bi-directional auxiliary channel 3014 capable of supporting data transmission rates up to at least 480 Mbs using a self-clocked data signal (based upon Manchester II channel coding, for example) providing an optional USB compatible data link. Therefore, in those cases where display 3004 is USB compatible (i.e., includes an optional USB port 3016), auxiliary channel 3014 can provide a USB compatible conduit between multimedia source 3002 and display 3004. In this way, any of a number of USB related transactions (such as file transfers) between multimedia source 3002 and display 3004 can be accommodated. In addition, hot plug detect (HPD) channel 3018 provides a conduit to carry HPD signal 3020 that can be used for hot swapping. In the described embodiment, the auxiliary channel master in the form of multimedia source 3002 detects hot-plug and hot-unplug events by periodically driving (or measuring) positive and negative signals of auxiliary channel 3014. Power pins 3022 and 3024 provide an interface from multimedia source and display internal power supplies 3026 and 3028 respectively that can be used to power a dongle (repeater, interface converter, etc.). In the described embodiment, internal power supplies 3026 and 3028 can provide power on the order of 1.0 W or larger at approximately 5-12 V at about 500 mA maximum current.
During operation, packetizer 3030 included in transmitter 3032 packetizes native multimedia data 3034 (that can be either analog or digital) generated by and received from, for example, video unit 3036. In the described embodiment, video unit 3036 can provide a limited number of video formats (such as 480i, 480p, 720, and 1080i, for example) that require only as much bandwidth as can be accommodated by (single lane) main link 3010. In this situation, multimedia source 3002 acts as a master device and display 3004 as the slave device in that it is multimedia source 3002 that initiates any transaction for which display 3004 provides an appropriate response. Once data packets in the form of video stream 3008 are received at receiver 3038 connected to display side connector 3012, de-packetizer 3040 converts the data packets to video stream 3042 corresponding to native video stream 3034 using any number of well known techniques as input to display controller 3044. For example, receiver 3038 can include a time-base recovery (TBR) unit (not shown) that regenerates the native rate of video stream 3034 using time stamps embedded in data packets of video stream 3008. It should be noted, however, that for appropriately configured digital display devices (shown, for example, in FIG. 2C), time base recovery is unnecessary since display data is be sent to the display driver electronics included in display controller 3044 at the link character clock rate, thereby greatly reducing the number of channels required with a commensurate reduction in complexity and cost for the display.
FIG. 32 shows representative electrical sub-layers 3200 for compact communication link 3006 in accordance with an embodiment of the invention. As shown, auxiliary channel electrical sub layer contains transmitters and receivers. Positive and negative signals carried by auxiliary channel 3014 are terminated to ground via 50-ohm termination resistors at each end of auxiliary channel 3014. In the described implementation, drive current Idrive is programmable (depending in part on the link condition) and ranges from approximately 8 mA to approximately 24 mA resulting in a range of Vdifferential � pp of approximately 400 mV to approximately 1.2V. Compact main link 3010 includes a single twisted pair of wires that as known by those of skill in the art, twisted pair cable is a type of cable that consists of two independently insulated wires twisted around one another. One wire carries the signal while the other wire is grounded and absorbs signal interference and within the cable, the twisted pair is individually shielded where two pins for +12V power and ground are provided. In the described implementation, the characteristic impedance of each differential pair is about 100 ohms +/−20% and the entire cable is also shielded having an outer shield and any individual shields shorted to the connector shells on both ends that are, in turn, shorted to ground in the multimedia source device 3002. The main link 3010 is terminated on both ends and since the main link 3010 is AC coupled, the termination voltage can be anywhere between 0V (ground) to +3.6V.
A connector 3300 as shown in FIG. 33 has 11 pins in one row having a pinout that is identical both for the connector on the source device end and that on the display device end. The source device supplies the power. It should be noted that RJ45 (which is a standard connector for CAT5/CAT6 cables) is an option for the compact connector 3300.
FIG. 34 shows a flowchart detailing a process 3500 in accordance with an embodiment of the invention. Process 3500 can be used when either or both a multimedia source or sink can be interchangeably used as a master device. In this way, process 3500 can be referred to as a multi-master mode of operation. Accordingly, process 3500 begins at 3502 by determining if multimedia source is connected a display using, for example, hot plug detect (HPD). Once it has been determined that a display is connected to the multimedia source, then at 3504 a determination is made whether the multimedia source and display are operating in what is referred to as a multi-master mode. In multi-master mode, either the display or the multimedia source can act as a master device in that the master device originates master device command/request that is, in turn, responded to by the particular slave device. If it has been determined that the multimedia source and display are not in multi-master mode, then at 3506 the multimedia source waits until a multimedia source request is generated and executed at 3508. Returning back to 3504, if it had been determined that the multimedia source and display are in multi-master mode, then at 3510 a determination is made if the has been a display request generated. By display request it is meant any request generated by the display that is sent to the multimedia source from which a response is forthcoming. For example, if the display is a USB enable display device such as a TV and if the multimedia source is a digital camera, then the display request can take the form of a file (such as a digital photo) request for photo(s) stored in a memory device located in the digital camera. The requested file is then retrieved from the memory device and forwarded to the display for display on a displayer unit incorporated therein.
If at 3510 it had been determined that there is no display request, then control is passed back to 3506 until, and if, a multimedia source request is generated. If, however, it had been determined at 3510 that a display request has been generated, then at 3512 a determination is made if there is a concurrent multimedia source request. If there is no multimedia source request, then any display request is executed at 3514 otherwise, at 3516 a determination is made if there will be a collision between the multimedia source request and the display request. If it is determined that there will not be a collision, then the multimedia source request and the display request are executed in request order at 3508 and 3514, otherwise, the display request is held until the multimedia source request is executed at 3508 after which the display request is executed at 3514.
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