CN116347014A - Multi-channel EDID (electronic data interchange identification) and video safety isolation and switching device and application method thereof - Google Patents
Multi-channel EDID (electronic data interchange identification) and video safety isolation and switching device and application method thereof Download PDFInfo
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- CN116347014A CN116347014A CN202310319614.5A CN202310319614A CN116347014A CN 116347014 A CN116347014 A CN 116347014A CN 202310319614 A CN202310319614 A CN 202310319614A CN 116347014 A CN116347014 A CN 116347014A
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- 238000002955 isolation Methods 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims description 10
- 238000013497 data interchange Methods 0.000 title description 3
- 238000006243 chemical reaction Methods 0.000 claims abstract description 18
- 230000005540 biological transmission Effects 0.000 claims abstract description 11
- 238000001514 detection method Methods 0.000 claims abstract description 7
- 230000002093 peripheral effect Effects 0.000 claims description 8
- 238000010586 diagram Methods 0.000 description 4
- 230000002457 bidirectional effect Effects 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- 238000004088 simulation Methods 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/222—Studio circuitry; Studio devices; Studio equipment
- H04N5/262—Studio 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
- H04N5/268—Signal distribution or switching
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/14—Picture signal circuitry for video frequency region
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
- H04N5/765—Interface circuits between an apparatus for recording and another apparatus
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/01—Conversion of standards, e.g. involving analogue television standards or digital television standards processed at pixel level
- H04N7/0125—Conversion of standards, e.g. involving analogue television standards or digital television standards processed at pixel level one of the standards being a high definition standard
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management
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- Controls And Circuits For Display Device (AREA)
Abstract
The invention provides a safe isolation and switching device for multipath EDID and video, which carries out unidirectional isolation on an EDID part, and data can only be read out from a display by a main control, thereby ensuring unidirectional data transmission; and it gives consideration to various display interface switching functions, and can realize switching functions among multiple display interfaces under the condition that the host has multiple display inputs. It comprises the following steps: the first host computer display input end is integrated with a VGA interface and an HDMI interface, wherein the VGA interface is converted by a VGA converting HDMI device; the second host computer displays the input end, integrate HDMI interface in it; the shared display output end comprises an HDMI interface and a VGA interface, wherein the VGA interface is converted by an HDMI conversion VGA device; a singlechip A; a singlechip B; an FPGA; the two paths of interfaces of the display output end are respectively externally connected with a corresponding display, EDID information of the display is connected to the singlechip A after a selection path of the display change-over switch is shared, and the singlechip A simulates a host to perform DDC detection and collect display basic information.
Description
Technical Field
The invention relates to the technical field of video transmission, in particular to a device for safely isolating and switching multi-channel EDID (electronic data interchange) and video, and also provides a use method of the device.
Background
In the current mainstream product application, the display interface is directly connected to the display through the bridge chip after passing through the display conversion chip, and besides the displayed data signal, the display also has an EDID reading signal, and the signal uses the I2C protocol, I2C is a bidirectional data interface, the main control firstly sends an instruction to the display, the main control can read EDID information from the display after the display replies, and the display data can be normally output after the information is correct.
In the prior art, under the condition of multi-channel host display switching application, the same display interface can be switched only, for example, two channels of HDMI (high definition multimedia interface) or two channels of VGA (video graphics array) can be switched.
At present, the universal protocol of the EDID is an I2C bus, but the data bus is bidirectional, so that the risk that a display can read main control data exists, and the safety of information cannot be ensured.
In the prior art, there is no way to meet the switching requirement of multiple display interfaces, and only the same display interface can be switched.
Therefore, there is an urgent need to develop a device that can guarantee unidirectional data transmission and can realize a switching function between multiple display interfaces when a host has multiple display inputs.
Disclosure of Invention
Aiming at the problems, the invention provides a safe isolation and switching device for multi-channel EDID and video, which carries out unidirectional isolation on an EDID part, and data can only be read out from a display by a master control, thereby ensuring unidirectional data transmission; and it gives consideration to various display interface switching functions, and can realize switching functions among multiple display interfaces under the condition that the host has multiple display inputs.
A multi-way EDID, video security isolation and switching device, comprising:
the first host computer display input end is integrated with a VGA interface and an HDMI interface, wherein the VGA interface is converted by a VGA converting HDMI device;
the second host computer displays the input end, integrate HDMI interface in it;
the shared display output end comprises an HDMI interface and a VGA interface, wherein the VGA interface is converted by an HDMI conversion VGA device;
a singlechip A;
a singlechip B;
an FPGA;
the two paths of interfaces of the display output end are respectively externally connected with a corresponding display, EDID information of the display is connected to the single chip microcomputer A after a selection passage of the shared display change-over switch is formed, the single chip microcomputer A simulates a host computer to perform DDC detection and collect display basic information, the single chip microcomputer A converts the EDID information corresponding to the display output end into SPI packets, the SPI packets are subjected to unidirectional physical isolation through an FPGA and then transmitted to the single chip microcomputer B, and the single chip microcomputer B simulates the peripheral of the display, and selects the EDID information of the display corresponding to the display input end of the first host computer or the display input end of the second host computer through the host change-over switch;
the first host display input end is connected with the display change-over switch and then is connected to the host change-over switch, the second host display input end is connected to the host change-over switch, the host change-over switch is connected to the sharing display change-over switch, and the sharing display change-over switch is respectively connected to the HDMI interface of the sharing display output end and the HDMI conversion VGA device.
It is further characterized by:
the second host display input end comprises a corresponding VGA interface and a VGA conversion HDMI device, and a display change-over switch is arranged in the second host display input end;
the VGA interface and the VGA conversion HDMI device are converted into a corresponding video interface and a corresponding data conversion HDMI device according to the setting;
the one-way isolator is arranged between the host change-over switch and the sharing display change-over switch, the host change-over switch carries out HDMI one-way isolation and transmission on HDMI video information input by a host display input end to the sharing display change-over switch through the one-way physical isolator, so that driving capability is enhanced, and signal transmission distance is further.
The application method of the safety isolation and switching device for the multi-channel EDID and the video is characterized in that the safety isolation and switching device for the multi-channel EDID and the video is operated as follows:
the VGA or HDMI EDID information of the shared display output end is selected to be sent to the singlechip A through the shared display change-over switch, the singlechip A simulates a host to finish DDC detection, and the resolution basic information of the display is collected;
the SCM A converts the EDID information into SPI packets, performs unidirectional physical isolation through the FPGA and provides the SPI packets for the SCM B;
the SCM B simulates the display peripheral equipment, and selects EDID information corresponding to the first host or the second host through a host change-over switch;
the display input end of the first host computer provides EDID information for the VGA interface or the HDMI interface through the display change-over switch; the second host display input end only provides EDID information for the HDMI interface.
It is further characterized by:
the VGA or HDMI video information at the input end is displayed by the first host, one path of video information is selected to be output through the display change-over switch, and VGA video is also converted into HDMI video format to be output;
HDMI of the first host display input end and HDMI of the second host display input end select one path to output through the host change-over switch;
after the HDMI output passes through the unidirectional physical isolator, an HDMI output path is selected through the shared display change-over switch, wherein one output direction is connected with the VGA display through the connection VGA interface after being converted by the HDMI conversion VGA device, and the other output direction is directly connected with the HDMI display through the HDMI interface.
After the invention is adopted, the single-chip microcomputer A, FPGA and the single-chip microcomputer B carry out unidirectional isolation on the EDID part, data can only be read out from the display by the main control, the unidirectional property of data transmission is ensured, the device has multiple display interface switching functions, and the switching function among multiple display interfaces can be realized under the condition that the host has multiple display inputs.
Drawings
FIG. 1 is a schematic block diagram of an apparatus of an embodiment of the present invention;
fig. 2 is a schematic diagram of EDID transmission according to the present invention;
FIG. 3 is a schematic diagram of video transmission according to the present invention;
FIG. 4 is a schematic flow chart showing EDID according to the present invention;
fig. 5 is a schematic block diagram of unidirectional transmission of the I2C protocol according to the present invention.
Detailed Description
The safe isolating and switching device for multiplexing EDID and video, see FIG. 1, comprises a first host display input end, a second host display input end and a shared display output end;
in the implementation, the first host display input end is the display input end of the intranet host, the second host display input end is the display input end of the extranet host,
the display input end of the intranet host is integrated with a VGA interface and an HDMI interface, wherein the VGA interface is converted by a VGA conversion HDMI device, the specific model of the device is LT8522, and the device is provided with an intranet display change-over switch for selecting VGA input or HDMI input;
an HDMI interface is integrated in the display input end of the external network host;
the shared display output end comprises an HDMI interface and a VGA interface, wherein the VGA interface is converted by an HDMI conversion VGA device, and the specific model of the device is LT8511;
the model of the singlechip A is GD32F407VGT6MCU; the model of the singlechip B is GD32F407VGT6MCU; the model of the FPGA is 7AL100;
the single chip microcomputer A adopts an embedded operating system, the simulation host identifies display peripherals and reads EDID information, the EDID data can be subjected to unidirectional isolation processing by the FPGA in a SPI packet transfer mode, and then the data is forwarded to the single chip microcomputer B through the SPI, and the single chip microcomputer B stores the EDID information; an embedded operating system is adopted on the singlechip B, and peripheral equipment is simulated and displayed so as to establish display driving connection with a host, and then stored EDID information can be provided for an intranet host or an extranet host unit; referring to fig. 5, two SPI controllers are arranged in the FPGA, wherein the first SPI controller is used for receiving SPI data of the singlechip A and writing the SPI data into an internal FIFO, the SPI controller at the other end reads the data from the FIFO and outputs the data to the singlechip B, through the device, an I2C bus can be isolated, the EDID information of a display can be read only by a main control system, and the display can not read the information by the main control system; the display switching function under the condition of a plurality of hosts can be met, two display interfaces are adapted, and the application scene is wider.
In specific implementation, two paths of interfaces of the display output end are respectively externally connected with a corresponding display, EDID information of the display is connected to a single chip microcomputer A after a selection path of a shared display change-over switch (a change-over switch of a CH482X type is specifically selected), the single chip microcomputer A simulates a host computer to perform DDC detection and collect display basic information, the single chip microcomputer A converts the EDID information corresponding to the display output end into SPI packets, the SPI packets are transmitted to a single chip microcomputer B after unidirectional physical isolation is performed by an FPGA, and the single chip microcomputer B simulates the peripheral of the display and selects the EDID information of the display corresponding to the display input end of an intranet host computer or an extranet host computer through an intranet change-over switch (the change-over switch of the CH482X type is specifically selected and is a host computer change-over switch);
the display input end of the intranet host is connected with the display change-over switch and then is connected to the host change-over switch, the display input end of the extranet host is connected to the host change-over switch, a unidirectional isolator is arranged between the host change-over switch and the sharing display change-over switch, the extranet change-over switch carries out HDMI unidirectional isolation and transmission on HDMI video information input by the display input end of the host to the sharing display change-over switch through the unidirectional physical isolator, so that the driving capability is enhanced, the signal transmission distance is further, and the sharing display change-over switch is respectively connected to an HDMI interface of the sharing display output end and a VGA conversion HDMI device.
The application method of the multi-channel EDID and video safety isolation and switching device is shown in fig. 2-5, and the multi-channel EDID and video safety isolation and switching device is adopted for the following operations:
the VGA or HDMI EDID information of the shared display output end is selected to be sent to the singlechip A through the shared display change-over switch, the singlechip A simulates a host to finish DDC detection, and the resolution basic information of the display is collected;
the SCM A converts the EDID information into SPI packets, performs unidirectional physical isolation through the FPGA and provides the SPI packets for the SCM B;
the singlechip B simulates the display peripheral equipment, and selects EDID information corresponding to the internal host or the external host through a host change-over switch;
the display input end of the intranet host computer selectively provides EDID information for the VGA interface or the HDMI interface through the intranet display change-over switch; and the display input end of the external network host only provides EDID information for the HDMI interface.
The specific operation method comprises the following steps that VGA or HDMI video information at the input end is displayed by an intranet host, one path of video information is selected to be output through an intranet display change-over switch, and VGA video is also converted into HDMI video format to be output;
the HDMI of the display input end of the intranet host and the HDMI of the display input end of the extranet host select one path to output through the extranet change-over switch;
after HDMI output passes through a unidirectional physical isolator HDMI TSO TBD (model ADN4654 in specific implementation), an HDMI output path is selected through a shared display change-over switch, wherein one output direction is that the HDMI output path is connected with a VGA display through a VGA interface after being converted by an HDMI conversion VGA device, and the other output direction is that the HDMI output path is directly connected with the HDMI display through the HDMI interface.
The data signal and the EDID signal are synchronously switched, and the data paths 1- > 3- > 4- > 5- > 6- > 7- > 8 in the figure 2 correspond to the data paths 1' →3' →4' →6' →7' →8' →9' in the figure 3; the data paths 2→3→4→5→6→7→9 in fig. 2 correspond to the data paths 2' →3' →4' →6' →7' →8' →10' in fig. 3; the data paths 2→3→4→5→6→7→10 in fig. 2 correspond to the data paths 5' →6' →7' →8' →10' in fig. 3.
Through the device, the I2C bus can be isolated, the EDID information of the display can be read only by the main control system, and the display can not read the information from the main control system; the display switching function under the condition of a plurality of hosts can be met, two display interfaces are adapted, and the application scene is wider.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.
Claims (8)
1. A multi-way EDID, video security isolation and switching device, comprising:
the first host computer display input end is integrated with a VGA interface and an HDMI interface, wherein the VGA interface is converted by a VGA converting HDMI device;
the second host computer displays the input end, integrate HDMI interface in it;
the shared display output end comprises an HDMI interface and a VGA interface, wherein the VGA interface is converted by an HDMI conversion VGA device;
a singlechip A;
a singlechip B;
an FPGA;
the two paths of interfaces of the display output end are respectively externally connected with a corresponding display, EDID information of the display is connected to the single chip microcomputer A after a selection passage of the shared display change-over switch is formed, the single chip microcomputer A simulates a host computer to perform DDC detection and collect display basic information, the single chip microcomputer A converts the EDID information corresponding to the display output end into SPI packets, the SPI packets are subjected to unidirectional physical isolation through an FPGA and then transmitted to the single chip microcomputer B, and the single chip microcomputer B simulates the peripheral of the display, and selects the EDID information of the display corresponding to the display input end of the first host computer or the display input end of the second host computer through the host change-over switch;
the first host display input end is connected with the display change-over switch and then is connected to the host change-over switch, the second host display input end is connected to the host change-over switch, the host change-over switch is connected to the sharing display change-over switch, and the sharing display change-over switch is respectively connected to the HDMI interface of the sharing display output end and the HDMI conversion VGA device.
2. A multi-way EDID, video security isolation and switching device as defined in claim 1, wherein: the second host display input end comprises a corresponding VGA interface and a VGA conversion HDMI device, and a display change-over switch is arranged in the second host display input end.
3. A multi-way EDID, video security isolation and switching device according to claim 2, wherein: the VGA interface and the VGA conversion HDMI device are converted into corresponding video interfaces and corresponding data conversion HDMI devices according to the setting.
4. A multi-way EDID, video security isolation and switching device as defined in claim 1, wherein: the one-way isolator is arranged between the host switch and the shared display switch, and the host switch carries out HDMI one-way isolation and transmission on HDMI video information input by a host display input end to the shared display switch through the one-way physical isolator.
5. The application method of the safety isolation and switching device for the multi-channel EDID and the video is characterized in that the safety isolation and switching device for the multi-channel EDID and the video is operated as follows:
the VGA or HDMI EDID information of the shared display output end is selected to be sent to the singlechip A through the shared display change-over switch, the singlechip A simulates a host to finish DDC detection, and the resolution basic information of the display is collected;
the SCM A converts the EDID information into SPI packets, performs unidirectional physical isolation through the FPGA and provides the SPI packets for the SCM B;
the SCM B simulates the display peripheral equipment, and selects EDID information corresponding to the first host or the second host through a host change-over switch;
the display input end of the first host computer provides EDID information for the VGA interface or the HDMI interface through the display change-over switch; the second host display input end only provides EDID information for the HDMI interface.
6. The method for using the multi-channel EDID, video safety isolation and switching device according to claim 5, wherein: the first host displays VGA or HDMI video information at the input end, and selects one path to output through a display change-over switch, wherein VGA video is also converted into HDMI video format to output.
7. The method for using the multi-channel EDID, video safety isolation and switching device according to claim 5, wherein: HDMI of the first host display input end and HDMI of the second host display input end select one path to output through the host change-over switch.
8. The method for using the multi-channel EDID, video safety isolation and switching device according to claim 5, wherein: after the HDMI output passes through the unidirectional physical isolator, an HDMI output path is selected through the shared display change-over switch, wherein one output direction is connected with the VGA display through the connection VGA interface after being converted by the HDMI conversion VGA device, and the other output direction is directly connected with the HDMI display through the HDMI interface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310319614.5A CN116347014A (en) | 2023-03-29 | 2023-03-29 | Multi-channel EDID (electronic data interchange identification) and video safety isolation and switching device and application method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310319614.5A CN116347014A (en) | 2023-03-29 | 2023-03-29 | Multi-channel EDID (electronic data interchange identification) and video safety isolation and switching device and application method thereof |
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| Publication Number | Publication Date |
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| CN116347014A true CN116347014A (en) | 2023-06-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202310319614.5A Pending CN116347014A (en) | 2023-03-29 | 2023-03-29 | Multi-channel EDID (electronic data interchange identification) and video safety isolation and switching device and application method thereof |
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| CN (1) | CN116347014A (en) |
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- 2023-03-29 CN CN202310319614.5A patent/CN116347014A/en active Pending
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