CN101464849B - Mixed digital interface - Google Patents
Mixed digital interface Download PDFInfo
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- CN101464849B CN101464849B CN2007101251990A CN200710125199A CN101464849B CN 101464849 B CN101464849 B CN 101464849B CN 2007101251990 A CN2007101251990 A CN 2007101251990A CN 200710125199 A CN200710125199 A CN 200710125199A CN 101464849 B CN101464849 B CN 101464849B
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Abstract
The invention provides a mixed digital interface, which comprises a controller, a multipath selector connected with the controller, an HDMI interface circuit and a USB interface circuit connected with the multipath selector, and an HDMI interface with an embedded USB interface connected with the HDMI interface circuit and the USB interface circuit. The controller is used to control the multipath selector to choose the HDMI interface circuit and realize the transmission of HDMI signals, or choose the USB interface circuit to realize the data transmission of USB. The technical scheme provided by the invention combines the HDMI interface and the USB interface together, and only one digital interface is adopted to realize HDMI protocol and USB protocol, thereby facilitating use, saving space and at the same time reducing cost, and automatically realizing the selection between the HDMI interface circuit and the USB interface circuit.
Description
Technical field
The invention belongs to the interfacing field, relate in particular to the technology of HDMI (High-Definition MultimediaInterface high-definition media interface) interface and USB (Universal Serial Bus USB (universal serial bus)) interface.
Background technology
USB interface is a kind of bus interface of widespread use in the existing electronic equipment, generally is used for various products, as computer, TV, set-top box, digital camera etc.USB device has become an indispensable part in people's daily life.
And flourish along with audio-visual technique, people become more and more higher to the requirement of the resolution of image, color depth, colourity.Thus, the HD digital video interface also grows up, as the application of HDMI interface etc. also more and more widely.
The HDMI interface has three kinds of interfaces at present: category-A, category-B and C class, and wherein category-A has 4 pairs of differential paths, 2 control signals, 1 CEC signal, 1 5V power lead also has 1 earth signal.The category-B interface is Duoed 3 pairs of differential transfer passages than the category-A interface.The physical connection of C class interface and category-A interface are on all four, and different is that the category-A interface is smaller than C class interface.And for USB interface, have only 4 signal wires, 1 pair of differential signal line, 1 5V power lead and 1 ground wire.
Because the impedance matching of the coupling of the impedance of USB interface and HDMI interface is different, in the existing electronic product or only be equipped with USB interface, or only is equipped with the HDMI interface, or disposes USB interface and HDMI interface simultaneously.Only dispose an interface and cause use inconvenience, make cost too high and dispose two interfaces simultaneously, design is complicated, therefore, needs a kind of technical scheme, the feasible transmission that can realize usb data and HDMI data by an interface simultaneously.
Summary of the invention
The object of the present invention is to provide a kind of mixed digital interface, being intended to solve the HDMI interface and the USB interface that exist in the prior art can not compatible problem.
For achieving the above object, the technical solution used in the present invention is as follows:
A kind of mixed digital interface, described mixed digital interface comprises controller, the MUX that links to each other with described controller, the HDMI interface circuit and the usb circuit that link to each other with described MUX, the HDMI interface of the embedded USB interface that links to each other with usb circuit with described HDMI interface circuit, described HDMI interface circuit comprises HDMI impedance matching circuit and HDMI interface controller, when the external HDMI equipment of the HDMI of described embedded USB interface interface, described HDMI interface controller transmits control signal to described controller, described controller is used for controlling described HDMI impedance matching circuit of described MUX gating and HDMI interface controller according to described control signal, described usb circuit comprises USB impedance matching circuit and usb interface controller, when the HDMI of described embedded USB interface interface circumscribed USB equipment, described controller is used for controlling described USB impedance matching circuit of described MUX gating and usb interface controller.
Described HDMI interface controller is used for realizing the agreement of HIDMI.
Described HDMI is used for realizing the setting of transition minimized differential signaling coding, control data bag and the transmission frequency of HDMI data.
Described usb interface controller is used for realizing the agreement of USB.
The HDMI interface of described embedded USB interface comprises that HIDMI changes the conversion head of USB.
5v power supply in the HDMI interface of described embedded USB interface also is used for being charging external equipment.
The data of the HDMI interface default transport of described embedded USB are the data of USB interface.
When HDMI connects, the HDMI interface of described embedded USB transmission HDMI data.
The present invention overcomes the deficiencies in the prior art, employing is by controller control MUX gating HDMI interface circuit or usb circuit, and be respectively HDMI interface circuit and usb circuit configuration impedance matching circuit, realize the transmission of HDMI data by the HDMI interface circuit, realize the technical scheme of transmission of usb data by usb circuit, HDMI interface and USB interface are unified, adopt 1 digital interface just can realize HDMI agreement and usb protocol, easy to use, save the space and reduced cost simultaneously, and, can realize automatically the selection of HDMI interface circuit or usb circuit.
Description of drawings
Fig. 1 is the theory diagram of the described mixed digital interface of the embodiment of the invention;
Fig. 2 be the embodiment of the invention described be the circuit diagram of charging external equipment by the hybrid digital circuit.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
The theory diagram of the mixed digital interface that the embodiment of the invention provides as shown in Figure 1, comprise controller 11, the MUX 14 that links to each other with described controller, the HDMI interface circuit 12 and the usb circuit 13 that link to each other with described MUX 14, the HDMI interface 15 of the embedded USB interface that links to each other with usb circuit 13 with described HDMI interface circuit 12.HDMI interface circuit 12 comprises HDMI impedance matching circuit 122 and HDMI interface controller 121, and usb circuit 13 comprises USB impedance matching circuit 132 and usb interface controller 131.
HDMI impedance matching circuit 122 links to each other 121 with the HDMI interface controller, USB impedance matching circuit 132 links to each other with usb interface controller 131, MUX 14 links to each other with the HDMI interface 15 of embedded USB interface, HDMI interface controller 121 and HDMI impedance matching circuit 122 have been formed HDMI interface circuit 12, and usb interface controller 131 and USB impedance matching circuit 132 have been formed usb circuit 13, wherein: 11 pairs of total systems of controller play a part control, controller 11 control MUX 14 select HDMI interface circuit 12 still to select usb circuit 13, thereby the transmission of decision mixed digital interface is usb data or HDMI data.In the present embodiment, default transport be usb data, what default transport also can be set in other embodiments is the HDMI data.
When the sink of HDMI interface (receiving equipment) end and source (source device) end link together, tell source that end transmits the video data of which kind of form by the sink end, how much resolution is, producer's information etc.The embodiment of the invention is utilized the These characteristics of HDMI, and after HDMI equipment connected, the hot plug signal of HDMI interface will be put height.After the hot plug signal was put height, the source of HDMI end will pass through I
2The C bus reads the resolution of sink end, information such as video data.If the equipment of source end can meet information conditions such as above-mentioned resolution, video data, illustrate that then the equipment of this source end is effective HDMI equipment.Above-mentioned promptly is the identifying of HDMI equipment.
After the identification of finishing HDMI equipment, HDMI interface controller 121 in the present embodiment sends to a control signal to controller 11, whether have legal HDMI equipment to connect by this control signal notification controller 11, this control signal can be high level signal or low level signal.If there is legal HDMI equipment to connect, controller 11 transmits control signal to MUX 14, make MUX 14 select HDMI impedance matching circuit 122, the transmission to the data of HDMI is finished in HDMI interface 15 work of HDMI interface controller 121 and HDMI impedance matching circuit 122 and embedded USB interface; If connect be illegal HDMI equipment or connection be USB device, controller 11 transmits control signal to MUX 14, make MUX 14 select USB impedance matching circuit 132, HDMI interface 15 work of usb interface controller 131 and USB impedance matching circuit 132 and embedded USB interface.The data that is to say HDMI interface 15 default transport of embedded USB are usb datas.When HDMI connects, the HDMI interface 15 transmission HDMI data of this embedded USB.
Above-mentioned HDMI interface controller 121 is used for realizing the agreement of HDMI, TMDS (the Transition Minimized Differential Signaling transition minimized differential signaling) coding that comprises the HDMI data, being provided with etc. of control data bag and transmission frequency.
Above-mentioned usb interface controller 131 is used for realizing the agreement of USB, by the selection of usb interface controller 131, can select to realize USB2.0 or USB1.1 agreement.Can adopt high-speed transfer also can select low speed transmissions.
Because the host-host protocol that HDMI adopts is TMDS, and its transmission speed can reach 3.4gbit/s, and transmission speed is very fast.Therefore want fewer interference, just must be in strict conformity with its impedance matching.And, realize that different its pull-up resistors of speed and the selection of pull down resistor size are different for USB interface.Therefore, in the embodiment of the invention impedance matching of the HDMI impedance matching with USB is separated, USB and HDMI can both then be decided on concrete situation for the selection of resistance capacitance with the state transfer of high s/n ratio.
The HDMI interface 15 of embedded USB interface can adopt two kinds of method designs, and first method is to adopt a kind of HDMI to change the conversion head of USB, promptly four data lines that USB uses is connected out; Another kind method is the structure that changes existing HDMI interface, makes it not only can insert USB interface but also can insert the HDMI interface, and wherein that used four data lines of USB is shared.
Owing in the HDMI interface 5v power lead and ground wire are arranged, it is that external portable set charges that the mixed digital interface that the embodiment of the invention provides can also utilize 5v power lead and ground wire in the HDMI interface of embedded USB interface, circuit diagram as shown in Figure 2, power circuit wherein mainly is a charging circuit.
It still is usb circuit 13 that the present invention adopts by controller 11 control MUX 14 gating HDMI interface circuits 12, and be respectively HDMI interface circuit 12 and usb circuit 13 configuration impedance matching circuits, realize the transmission of HDMI data by HDMI interface circuit 12, realize the technical scheme of transmission of usb data by usb circuit 13, HDMI interface and USB interface are unified, adopt same digital interface just can realize HDMI agreement and usb protocol, easy to use, save the space and reduced cost simultaneously, and, can realize automatically the selection of HDMI interface circuit 12 or usb circuit 13.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. mixed digital interface, it is characterized in that, described mixed digital interface comprises controller, the MUX that links to each other with described controller, the HDMI interface circuit and the usb circuit that link to each other with described MUX, the HDMI interface of the embedded USB interface that links to each other with usb circuit with described HDMI interface circuit, described HDMI interface circuit comprises HDMI impedance matching circuit and HDMI interface controller, when the external HDMI equipment of the HDMI of described embedded USB interface interface, described HDMI interface controller transmits control signal to described controller, described controller is used for controlling described HDMI impedance matching circuit of described MUX gating and HDMI interface controller according to described control signal, described usb circuit comprises USB impedance matching circuit and usb interface controller, when the HDMI of described embedded USB interface interface circumscribed USB equipment, described controller is used for controlling described USB impedance matching circuit of described MUX gating and usb interface controller.
2. mixed digital interface according to claim 1 is characterized in that described HDMI interface controller is used for realizing the agreement of HDMI.
3. mixed digital interface according to claim 2 is characterized in that, described HDMI interface controller is used for realizing the setting of transition minimized differential signaling coding, control data bag and the transmission frequency of HDMI data.
4. mixed digital interface according to claim 1 is characterized in that described usb interface controller is used for realizing the agreement of USB.
5. mixed digital interface according to claim 1 is characterized in that, the HDMI interface of described embedded USB interface comprises that HDMI changes the conversion head of USB.
6. mixed digital interface according to claim 1 is characterized in that, the 5v power supply in the HDMI interface of described embedded USB interface also is used for being charging external equipment.
7. mixed digital interface according to claim 1 is characterized in that, the data of the HDMI interface default transport of described embedded USB are the data of USB interface.
8. mixed digital interface according to claim 7 is characterized in that, when HDMI connects, and the HDMI interface of described embedded USB transmission HDMI data.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101251990A CN101464849B (en) | 2007-12-21 | 2007-12-21 | Mixed digital interface |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101251990A CN101464849B (en) | 2007-12-21 | 2007-12-21 | Mixed digital interface |
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| Publication Number | Publication Date |
|---|---|
| CN101464849A CN101464849A (en) | 2009-06-24 |
| CN101464849B true CN101464849B (en) | 2010-09-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2007101251990A Expired - Fee Related CN101464849B (en) | 2007-12-21 | 2007-12-21 | Mixed digital interface |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102572351A (en) * | 2010-12-25 | 2012-07-11 | 鸿富锦精密工业（深圳）有限公司 | VGA (Video Graphics Array) and HDMI (High Definition Multimedia Interface) compatible interface circuit |
| US8683087B2 (en) * | 2011-04-11 | 2014-03-25 | Fairchild Semiconductor Corporation | Mobile device auto detection apparatus and method |
| CN102662431B (en) * | 2012-03-14 | 2015-05-27 | 华为终端有限公司 | A docking station, method and system for controlling peripheral by utilizing same |
| CN102890666B (en) | 2012-07-13 | 2015-09-30 | 华为终端有限公司 | A kind of devices and methods therefor of shared interface, communication terminal |
| CN103647917B (en) * | 2013-12-23 | 2017-02-22 | 乐视致新电子科技（天津）有限公司 | Expansion device of television input/output interface |
| CN104810005B (en) * | 2014-01-29 | 2017-09-19 | 瑞昱半导体股份有限公司 | Pluggable electronic installation and the method for determining pluggable electronic installation institute output data |
| CN106789603A (en) * | 2015-11-20 | 2017-05-31 | 刘三水 | Multi-purpose data exchange system |
| KR102461604B1 (en) * | 2016-02-16 | 2022-11-02 | 삼성전자주식회사 | Data transceiving method and device |
| CN107302677A (en) * | 2016-04-14 | 2017-10-27 | 鸿富锦精密工业(武汉)有限公司 | HDMI and DP compatibility interface circuits |
| CN106454185A (en) * | 2016-12-26 | 2017-02-22 | 深圳Tcl数字技术有限公司 | High-definition multimedia interface multiplexing apparatus and method |
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|---|---|---|---|---|
| CN2793984Y (en) * | 2005-01-17 | 2006-07-05 | 蔡汉仪 | Composite connector |
| CN1870656A (en) * | 2006-06-15 | 2006-11-29 | 北京中星微电子有限公司 | USB time sequential adaptive device, interface and its communication method |
| CN1885921A (en) * | 2005-06-22 | 2006-12-27 | 厦门华侨电子企业有限公司 | TV set setting USB/memory card interface and its software upgrading method |
| US7255567B1 (en) * | 2006-02-21 | 2007-08-14 | Sheng-Hsin Liao | Pivoting adapter structure for assembling plugs |
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2007
- 2007-12-21 CN CN2007101251990A patent/CN101464849B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2793984Y (en) * | 2005-01-17 | 2006-07-05 | 蔡汉仪 | Composite connector |
| CN1885921A (en) * | 2005-06-22 | 2006-12-27 | 厦门华侨电子企业有限公司 | TV set setting USB/memory card interface and its software upgrading method |
| US7255567B1 (en) * | 2006-02-21 | 2007-08-14 | Sheng-Hsin Liao | Pivoting adapter structure for assembling plugs |
| CN1870656A (en) * | 2006-06-15 | 2006-11-29 | 北京中星微电子有限公司 | USB time sequential adaptive device, interface and its communication method |
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| CN101464849A (en) | 2009-06-24 |
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