CN109246366A - A kind of LVDS interface switch and its switching method - Google Patents

A kind of LVDS interface switch and its switching method Download PDF

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Publication number
CN109246366A
CN109246366A CN201811029391.4A CN201811029391A CN109246366A CN 109246366 A CN109246366 A CN 109246366A CN 201811029391 A CN201811029391 A CN 201811029391A CN 109246366 A CN109246366 A CN 109246366A
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CN
China
Prior art keywords
lvds
data
tft
interface
output
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
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CN201811029391.4A
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Chinese (zh)
Inventor
张世强
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Tianjin Embedtec Co Ltd
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Tianjin Embedtec Co Ltd
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Application filed by Tianjin Embedtec Co Ltd filed Critical Tianjin Embedtec Co Ltd
Priority to CN201811029391.4A priority Critical patent/CN109246366A/en
Publication of CN109246366A publication Critical patent/CN109246366A/en
Pending legal-status Critical Current

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00Details of television systems
    • H04N5/222Studio circuitry; Studio devices; Studio equipment ; Cameras comprising an electronic image sensor, e.g. digital cameras, video cameras, TV cameras, video cameras, camcorders, webcams, camera modules for embedding in other devices, e.g. mobile phones, computers or vehicles
    • H04N5/262Studio circuits, e.g. for mixing, switching-over, change of character of image, other special effects ; Cameras specially adapted for the electronic generation of special effects
    • H04N5/268Signal distribution or switching
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/44Decoders specially adapted therefor, e.g. video decoders which are asymmetric with respect to the encoder
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00Details of television systems
    • H04N5/76Television signal recording
    • H04N5/765Interface circuits between an apparatus for recording and another apparatus

Abstract

The present invention provides a kind of LVDS interface switch and its switching methods, it is related to communication interface handoff technique field, first, the input signal of two-way LVDS interface reception external equipment LVDS display interface, the decoding of received input signal is converted into TFT data by Video Decoder, and TFT data are sent to FPGA;Then, FPGA reads two-way TFT data, and according to the parameter setting of channel to channel adapter, will be sent to video encoder as TFT output data all the way in two-way TFT data;Finally, TFT output data is encoded to LVDS output data by video encoder, external C equipment LVDS display interface is sent to by LVDS output interface and is shown.The technical solution is combined by using FPGA with dual-channel LVDS communication link, it realizes equipment two-way LVDS interface and shares a display equipment, it is changeable to be arbitrarily output to LVDS display screen all the way, alleviate the technical issues of being difficult to realize two road LVDS display interface alternative handoff functionalities of the existing technology.

Description

A kind of LVDS interface switch and its switching method
Technical field
The present invention relates to communication interface handoff technique fields, more particularly, to a kind of LVDS interface switch and its switching side Method.
Background technique
As computer application is universal, some large size applications apply Multiple-shower interface, for example, VGA, DVI, DP, Multihead displays such as LVDS etc., component environment are limited to LVDS screen mesh number amount, need multiplex roles to switch to same screen mesh and show, especially Multiple identical LVDS display interfaces are tested, each interface is shown with a LVDS interface not only wastes limited resource, simultaneously Also efficiency of transmission is reduced, therefore, the design of LVDS interface switch is very necessary.
It is different from the display interfaces such as VGA, DVI currently, LVDS interface is integrated with display generally in plate, it is indirect right Outside, therefore LVDS switching device is seldom.A kind of Chinese patent " time division duplexed high-rate LVDS port circuit " (application number 201410681914.9) disclose a kind of time division duplexed high-rate LVDS port circuit design scheme.The program is mainly for high speed The multiplexing of digital analog converter input terminal LVDS, the invention reduce multicore high-speed, high precision D/A converter input port number, Purpose is to improve the utilization efficiency of digital analog converter data-in port.But control mode used by the technical solution is difficult To be applied to the use environment of two road LVDS display interface alternatives switching, that is, it is difficult to realize the solution of two road LVDS vision signals Code, switching and coding output.
Summary of the invention
In view of this, the purpose of the present invention is to provide a kind of LVDS interface switch and its switching method, it is existing to alleviate There is the technical issues of two road LVDS display interface alternative handoff functionalities is difficult to realize present in technology.
The embodiment of the invention provides a kind of LVDS interface switching methods, comprising:
LVDS interface A receives the input signal A of the LVDS data format of external A equipment LVDS display interface, and input signal A is sent out It send to Video Decoder A, input signal A decoding is converted into TFT data A by Video Decoder A, and TFT data A is sent to FPGA;
LVDS interface B receives the input signal B of the LVDS data format of external B device LVDS display interface, and input signal B is sent out It send to Video Decoder B, input signal B decoding is converted into TFT data B by Video Decoder B, and TFT data B is sent to FPGA;
FPGA reads TFT data A and TFT data B, and according to the parameter setting of channel to channel adapter, by TFT data A or TFT data B is sent to video encoder as TFT output data;
TFT output data is encoded to LVDS output data by video encoder, and send LVDS output data to LVDS output connect Mouthful, external C equipment LVDS display interface is sent to by LVDS output interface and is shown.
Further, it in LVDS interface switching method provided in an embodiment of the present invention, is set according to the parameter of channel to channel adapter It is fixed, it is sent to video encoder using TFT data A or TFT data B as TFT output data, specifically, the ginseng of channel to channel adapter When number is set as high level, any TFT data in TFT data A and TFT data B is selected to be sent to view as TFT output data Frequency encoder;
When the parameter setting of channel to channel adapter is low level, selects another TFT data to be sent to video as TFT output data and compile Code device.
Further, the embodiment of the invention also provides a kind of LVDS interface switch based on aforementioned switching method, packets Include: LVDS interface A, LVDS interface B, Video Decoder A, Video Decoder B, FPGA, channel to channel adapter, video encoder and LVDS output interface;
The output end of LVDS interface A is connect with the input terminal of Video Decoder A;The output end and Video Decoder B of LVDS interface B Input terminal connection, Video Decoder A, the output end of Video Decoder B and FPGA input terminal connection;
The output end of channel to channel adapter and the input terminal of FPGA connect;
The output end of FPGA and the input terminal of video encoder connect, and the output end of video encoder and LVDS output interface connect It connects.
Further, in LVDS interface switch provided in an embodiment of the present invention, video encoder is DS90CF363B volume Code chip.
Further, in LVDS interface switch provided in an embodiment of the present invention, FPGA is EP3C5E144I7N core Piece.
Further, in LVDS interface switch provided in an embodiment of the present invention, Video Decoder A and Video Decoder B It is SN75LVDS86A decoding chip.
The embodiment of the present invention bring it is following the utility model has the advantages that LVDS interface switch provided by the embodiment of the present invention and its Switching method, firstly, LVDS interface A receives the input signal A of the LVDS data format of external A equipment LVDS display interface, it will Input signal A is sent to Video Decoder A, and input signal A decoding is converted into TFT data A by Video Decoder A, and by TFT number FPGA is sent to according to A;Meanwhile LVDS interface B receives the input signal of the LVDS data format of external B device LVDS display interface Input signal B is sent to Video Decoder B by B, and input signal B decoding is converted into TFT data B by Video Decoder B, and will TFT data B is sent to FPGA;Then, FPGA reads TFT data A and TFT data B, and is set according to the parameter of channel to channel adapter It is fixed, video encoder is sent to using TFT data A or TFT data B as TFT output data;Finally, video encoder is defeated by TFT Data encoding is LVDS output data out, and sends LVDS and output data to LVDS output interface, is sent by LVDS output interface To external C equipment LVDS display interface and show.The technical solution is combined by using FPGA with dual-channel LVDS communication link, It realizes equipment two-way LVDS interface and shares a display equipment, changeable to be arbitrarily output to LVDS display screen all the way, the technology Scheme connection structure is simple, and transmission data are reliable, is convenient for practical application, alleviates and of the existing technology is difficult to realize two tunnels The technical issues of LVDS display interface alternative handoff functionality.
To enable the above objects, features and advantages of the present invention to be clearer and more comprehensible, preferred embodiment is cited below particularly, and cooperate Appended attached drawing, is described in detail below.
Detailed description of the invention
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art Embodiment or attached drawing needed to be used in the description of the prior art be briefly described, it should be apparent that, it is described below Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor It puts, is also possible to obtain other drawings based on these drawings.
Fig. 1 is the flow chart of LVDS interface switching method provided in an embodiment of the present invention;
Fig. 2 is the structure principle chart of LVDS interface switch provided in an embodiment of the present invention.
Icon:
100-LVDS interface A;200-LVDS interface B;300- Video Decoder A;400- Video Decoder B;500- FPGA; 600- channel to channel adapter;700- video encoder;800-LVDS output interface.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with attached drawing to the present invention Technical solution be clearly and completely described, it is clear that described embodiments are some of the embodiments of the present invention, rather than Whole embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work premise Under every other embodiment obtained, shall fall within the protection scope of the present invention.
Currently, multiplexing of the existing LVDS interface conversion equipment mainly for high-speed A/D converter input terminal LVDS, it should Invention reduces multicore high-speed, high precision D/A converter input port number, it is therefore an objective to improve digital analog converter data input pin The utilization efficiency of mouth.But control mode used by the technical solution is dfficult to apply to two road LVDS display interface alternatives The use environment of switching is based on this, a kind of LVDS interface switch and its switching method provided in an embodiment of the present invention, Ke Yihuan Solve the technical issues of being difficult to realize two road LVDS display interface alternative handoff functionalities existing in the prior art.
Referring to Fig. 1, the flow chart of LVDS interface switching method provided in an embodiment of the present invention.It is provided in an embodiment of the present invention LVDS interface switching method, includes the following steps:
Firstly, LVDS interface A receives the input signal A of the LVDS data format of external A equipment LVDS display interface, input is believed Number A is sent to Video Decoder A, and input signal A decoding is converted into TFT data A by Video Decoder A, and TFT data A is sent out It send to FPGA.
Meanwhile LVDS interface B receives the input signal B of the LVDS data format of external B device LVDS display interface, it will be defeated Enter signal B and be sent to Video Decoder B, input signal B decoding is converted into TFT data B by Video Decoder B, and by TFT data B is sent to FPGA.
Then, FPGA reads TFT data A and TFT data B, and according to the parameter setting of channel to channel adapter, by TFT data A Or TFT data B is sent to video encoder as TFT output data.
Finally, TFT output data is encoded to LVDS output data by video encoder, and sends LVDS and output data to LVDS output interface is sent to external C equipment LVDS display interface by LVDS output interface and is shown.
Further, LVDS interface switching method provided in an embodiment of the present invention, wherein according to the parameter of channel to channel adapter Setting, is sent to video encoder using TFT data A or TFT data B as TFT output data, specifically, channel to channel adapter Parameter setting is divided into high level and low level, when being set as high level, selects any TFT number in TFT data A and TFT data B Video encoder is sent to according to as TFT output data;When the parameter setting of channel to channel adapter is low level, another TFT is selected Data are sent to video encoder as TFT output data.
The embodiment of the invention also provides a kind of LVDS interface switch based on aforementioned switching method, which is LVDS video acquisition and switched design, can be realized two-way LVDS display channel makes can control, and alternative is output to LVDS and shows Screen.Switch design takes full advantage of hardware resource abundant inside FPGA, has structure simple, and transmission data are reliable, is The characteristics of system division of labor is clear, is convenient for practical application.Referring to fig. 2, the structure of LVDS interface switch provided in an embodiment of the present invention Schematic diagram.The interface switch includes: LVDS interface A(100), LVDS interface B(200), Video Decoder A(300), video solution Code device B(400), FPGA(500), channel to channel adapter (600), video encoder (700) and LVDS output interface (800).
The output end of LVDS interface A is connect with the input terminal of Video Decoder A;The output end and video solution of LVDS interface B The input terminal connection of code device B, the input terminal connection of Video Decoder A, the output end of Video Decoder B and FPGA.Wherein, LVDS The input terminal of interface A is connect with outside A equipment LVDS display interface, and LVDS interface A receives external A equipment LVDS display interface Input signal A is sent to Video Decoder A by the input signal A of LVDS data format;The input terminal and outside B of LVDS interface B The connection of equipment LVDS display interface, LVDS interface B receive the input letter of the LVDS data format of external B device LVDS display interface Number B, is sent to Video Decoder B for input signal A.Video Decoder A, Video Decoder B are used to data protocol conversion, tool Body, received input signal A decoding is converted into TFT data A by Video Decoder A, and TFT data A is sent to FPGA;Together When, received input signal B decoding is converted into TFT data B by Video Decoder B, and TFT data B is sent to FPGA.Into one Step, in LVDS interface switch provided in an embodiment of the present invention, Video Decoder A and Video Decoder B are SN75LVDS86A decoding chip.
The output end of channel to channel adapter and the input terminal of FPGA connect, further, LVDS provided in an embodiment of the present invention In interface switch, FPGA is EP3C5E144I7N chip.FPGA is used for data conversion and switching, in the switch course of work In, FPGA reads the TFT data of Video Decoder A and Video Decoder B conversion, and FPGA is controlled by channel to channel adapter, and can Selecting Video Decoder A and Video Decoder B according to parameter setting, arbitrarily TFT data are exported all the way.FPGA reads TFT number According to A and TFT data B, and according to the parameter setting of channel to channel adapter, using TFT data A or TFT data B as TFT output data It is sent to video encoder.Specifically, the parameter setting of channel to channel adapter is divided into high level and low level, it is set as high level When, select any TFT data in TFT data A and TFT data B to be sent to video encoder as TFT output data;Channel When the parameter setting of selector is low level, another TFT data are selected as TFT output data and are sent to video encoder.
The output end of FPGA and the input terminal of video encoder connect, and the output end of video encoder connects with LVDS output Mouth connection.Further, in LVDS interface switch provided in an embodiment of the present invention, video encoder is DS90CF363B coding Chip.TFT output data is encoded to LVDS output data by video encoder, and send LVDS output data to LVDS output connect Mouthful, external C equipment LVDS display interface is sent to by LVDS output interface and is shown.
LVDS interface switch and its switching method provided by the embodiment of the present invention, firstly, LVDS interface A receives outside The input signal A of the LVDS data format of A equipment LVDS display interface, is sent to Video Decoder A, video for input signal A Input signal A decoding is converted into TFT data A by decoder A, and TFT data A is sent to FPGA;Meanwhile LVDS interface B connects The input signal B for receiving the LVDS data format of external B device LVDS display interface, is sent to Video Decoder for input signal B Input signal B decoding is converted into TFT data B by B, Video Decoder B, and TFT data B is sent to FPGA;Then, FPGA is read TFT data A and TFT data B is taken, and according to the parameter setting of channel to channel adapter, TFT data A or TFT data B is defeated as TFT Data are sent to video encoder out;Finally, TFT output data is encoded to LVDS output data by video encoder, and send LVDS outputs data to LVDS output interface, is sent to external C equipment LVDS display interface by LVDS output interface and is shown.It should Technical solution is combined by using FPGA with dual-channel LVDS communication link, is realized and is alternatively converted two-way LVDS interface It all the way and to be output to LVDS display screen and showing, and then realizes equipment two-way LVDS interface and shares a display equipment, can cut It changes and is arbitrarily output to LVDS display screen all the way, alleviate and of the existing technology be difficult to realize two road LVDS display interface alternatives The technical issues of handoff functionality, the technical solution connection structure is simple, and transmission data are reliable, is convenient for practical application.
Finally, it should be noted that embodiment described above, only a specific embodiment of the invention, to illustrate the present invention Technical solution, rather than its limitations, scope of protection of the present invention is not limited thereto, although with reference to the foregoing embodiments to this hair It is bright to be described in detail, those skilled in the art should understand that: anyone skilled in the art In the technical scope disclosed by the present invention, it can still modify to technical solution documented by previous embodiment or can be light It is readily conceivable that variation or equivalent replacement of some of the technical features;And these modifications, variation or replacement, do not make The essence of corresponding technical solution is detached from the spirit and scope of technical solution of the embodiment of the present invention, should all cover in protection of the invention Within the scope of.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.

Claims (6)

1. a kind of LVDS interface switching method characterized by comprising
LVDS interface A receives the input signal A of the LVDS data format of external A equipment LVDS display interface, and input signal A is sent out It send to Video Decoder A, input signal A decoding is converted into TFT data A by Video Decoder A, and TFT data A is sent to FPGA;
LVDS interface B receives the input signal B of the LVDS data format of external B device LVDS display interface, and input signal B is sent out It send to Video Decoder B, input signal B decoding is converted into TFT data B by Video Decoder B, and TFT data B is sent to FPGA;
FPGA reads TFT data A and TFT data B, and according to the parameter setting of channel to channel adapter, by TFT data A or TFT data B is sent to video encoder as TFT output data;
TFT output data is encoded to LVDS output data by video encoder, and send LVDS output data to LVDS output connect Mouthful, external C equipment LVDS display interface is sent to by LVDS output interface and is shown.
2. LVDS interface switching method according to claim 1, which is characterized in that the parameter according to channel to channel adapter Setting, is sent to video encoder using TFT data A or TFT data B as TFT output data, specifically, channel to channel adapter When parameter setting is high level, any TFT data in TFT data A and TFT data B is selected to be sent to as TFT output data Video encoder;
When the parameter setting of channel to channel adapter is low level, selects another TFT data to be sent to video as TFT output data and compile Code device.
3. a kind of LVDS interface switch based on switching method described in claim 1 characterized by comprising LVDS interface A, LVDS interface B, Video Decoder A, Video Decoder B, FPGA, channel to channel adapter, video encoder and LVDS output connect Mouthful;
The output end of the LVDS interface A is connect with the input terminal of the Video Decoder A;The output end of the LVDS interface B It is connect with the input terminal of the Video Decoder B, the output end and the FPGA of the Video Decoder A, Video Decoder B Input terminal connection;
The output end of the channel to channel adapter is connect with the input terminal of the FPGA;
The output end of the FPGA is connect with the input terminal of the video encoder, and the output end of the video encoder and institute State LVDS output interface connection.
4. LVDS interface switch according to claim 3, which is characterized in that the video encoder is DS90CF363B Coding chip.
5. LVDS interface switch according to claim 3, which is characterized in that the FPGA is EP3C5E144I7N Chip.
6. LVDS interface switch according to claim 3, which is characterized in that the Video Decoder A and video decoding Device B is SN75LVDS86A decoding chip.
CN201811029391.4A 2018-09-05 2018-09-05 A kind of LVDS interface switch and its switching method Pending CN109246366A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111327858A (en) * 2020-03-04 2020-06-23 青岛大学 Method, system and device for converting LVDS (Low Voltage differential Signaling) video signal into HDMI (high-definition multimedia interface) signal

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CN203278879U (en) * 2012-12-20 2013-11-06 广州视源电子科技股份有限公司 Multistage cascading transmission system of LVDS signal and LVDS signal selection switch unit
CN204667847U (en) * 2015-06-25 2015-09-23 深圳市东创良盛电子技术有限公司 A kind of Portable multifunctional tester
CN205430438U (en) * 2015-11-30 2016-08-03 北京东方兴华科技发展有限责任公司 Intelligence switch
US20180183418A1 (en) * 2016-12-22 2018-06-28 Nxp B.V. Low voltage differential signalling device

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Publication number Priority date Publication date Assignee Title
CN203278879U (en) * 2012-12-20 2013-11-06 广州视源电子科技股份有限公司 Multistage cascading transmission system of LVDS signal and LVDS signal selection switch unit
CN103050105A (en) * 2012-12-26 2013-04-17 长城信息产业股份有限公司 Display driving circuit of liquid crystal display for space
CN204667847U (en) * 2015-06-25 2015-09-23 深圳市东创良盛电子技术有限公司 A kind of Portable multifunctional tester
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US20180183418A1 (en) * 2016-12-22 2018-06-28 Nxp B.V. Low voltage differential signalling device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111327858A (en) * 2020-03-04 2020-06-23 青岛大学 Method, system and device for converting LVDS (Low Voltage differential Signaling) video signal into HDMI (high-definition multimedia interface) signal
CN111327858B (en) * 2020-03-04 2022-05-06 青岛大学 Method, system and device for converting LVDS (Low Voltage differential Signaling) video signal into HDMI (high-definition multimedia interface) signal

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Application publication date: 20190118