CN106851233B - Automatic updating method and device for EDID information of high-definition video optical transmitter and receiver - Google Patents
Automatic updating method and device for EDID information of high-definition video optical transmitter and receiver Download PDFInfo
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- CN106851233B CN106851233B CN201710041452.8A CN201710041452A CN106851233B CN 106851233 B CN106851233 B CN 106851233B CN 201710041452 A CN201710041452 A CN 201710041452A CN 106851233 B CN106851233 B CN 106851233B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/22—Adaptations for optical transmission
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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
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Abstract
The invention relates to an automatic updating method and device for EDID information of a high-definition video optical transmitter and receiver, belonging to the technical field of optical transmission. The transmitting optical transceiver realizes EDID information reading and verification in the data of the receiving optical transceiver by judging whether an optical fiber link is established and whether a hot plug pin is inserted, frames are grouped into EDID information packets through FPGA (field programmable gate array) and are sent to the transmitting optical transceiver, the transmitting optical transceiver judges the state of the optical link, pulls down the hot plug pin to inhibit reading of a high-definition video source, receives the EDID information packets through a high-speed transceiver module to extract, verify and judge, if the EDID information packets are consistent with pre-stored contents, updating is not carried out, otherwise, external memory information is updated, and automatic updating is realized. The invention can realize point-to-point automatic judgment, automatic updating and automatic loading without tools and changing the connection mode, complete full-automatic updating of EDID information, improve the application convenience of the high-definition video optical transceiver and have larger practical application value.
Description
Technical Field
The invention relates to an automatic updating method and device for EDID information of a high-definition video optical transmitter and receiver, belonging to the technical field of optical transmission.
Background
At present, high definition video (HDMI, DVI) class electricity transmission equipment, signal transmission data volume is big and the rate is high, along with the increase of distance, signal high frequency component decay is huge, so transmission distance is restricted. The limitation of long-distance signal transmission of the HDMI/DVI can be solved through optical fiber transmission, but EDID information processing is the key of the HDMI/DVI, and the EDID can be influenced by long distance.
EDID (Extended Display Identification Data) is a VESA standard Data format, is an optimized Display format Data specification set for PC Display, and is stored in a special EEPROM memory in the Display, and its Data structure contains 256Byte, PC host and Display access the memory by DDC channel to determine the functions and devices of the Display device, and the EDID information physical medium uses DDC channel to make communication, and the DDC channel communication protocol is in accordance with I2C protocol.
A typical set of high definition video transmission systems consists of a transmitter (a), a receiver (B) and a fiber optic transmission medium (C), as shown in fig. 1. In order to solve the problem that the EDID information cannot be transmitted in a long distance, a transmitter fixed configuration mode is generally adopted in the transmitter (A), and if the EDID information needs to be updated, the transmitter (A) needs to be interconnected and updated by means of a tool or a connecting display. However, the EDID information update operation is complicated, and the maintainability of the device is poor.
Disclosure of Invention
The purpose of the invention is: the method for automatically updating the EDID information of the high-definition video optical transceiver is convenient to operate and can realize automatic identification.
In addition, still provide a high definition video optical transmitter and receiver EDID information automatic updating device.
The technical scheme of the invention is as follows: an automatic updating device for EDID information of a high-definition video optical transmitter and receiver comprises a transmitting optical transmitter and receiver, wherein the transmitting optical transmitter and receiver comprises an EDID storage circuit, a hot plug conversion circuit, a video decoding module, an FPGA processing module and an optical module; the EDID storage circuit, the hot plug conversion circuit and the video decoding module are respectively connected with the FPGA processing module, and the output of the FPGA processing module is connected to the optical module; the receiving optical transceiver also comprises an EDID storage circuit, a hot plug conversion circuit, a video coding module, an FPGA processing module and an optical module, wherein the EDID storage circuit, the hot plug conversion circuit, the video coding module and the optical module of the receiving optical transceiver are all connected with the FPGA processing module in the receiving optical transceiver, and the DPLL module is connected with the FPGA processing module of the far-end receiving optical transceiver, wherein the optical modules of the receiving optical transceiver and the transmitting optical transceiver are connected through optical fibers.
When the far-end receiving optical transmitter-receiver is powered on, whether an optical link is established and the state of a hot plug pin is judged to realize EDID information reading, check the read information, encode framing and return at high speed.
The transmitting optical transceiver judges whether an optical link is established or not, receives high-speed serial data, decodes and extracts the high-speed serial data, compares and verifies the data, updates the EDID information of a new version, and realizes that a high-definition video source reads the EDID information by changing the state of a hot-plug pin.
The updating method based on the EDID information automatic device of the high-definition video optical transceiver comprises the steps that a transmitting optical transceiver decodes input high-definition video signals, processed data is sent to a receiving optical transceiver, the data received by the receiving optical transceiver is converted and processed and then output to external display equipment, wherein, the optical receiving end realizes EDID information reading and verification in the received data by judging whether an optical fiber link is established or not and whether a hot plug pin is inserted or not, framing and packaging the frames into EDID information packets through FPGA framing, sending the EDID information packets to the transmitting optical transceiver, judging the optical link state by the transmitting optical transceiver, pulling down the hot plug pins to inhibit the reading of the high-definition video source, and receiving the EDID information packet through the high-speed transceiver module to perform extraction, verification and judgment, if the EDID information packet is consistent with the pre-stored content, no updating is performed, and if the EDID information packet is not consistent with the pre-stored content, the information of the external memory is updated, so that automatic updating is realized.
After the optical transmitter-receiver is updated and verified, the high-definition video source reads the updated EDID information by pulling up the hot plug pin, so that full-automatic updating in the whole process is realized.
The method realizes automatic updating of EDID information and simultaneously realizes video transmission of high-definition video with the resolution of at least 1600 multiplied by 1200@60 Hz.
The invention has the beneficial effects that:
the invention realizes the automatic identification, automatic update and automatic loading of EDID information in the high-definition video optical transceiver, can fully automatically update display extended information (EDID), realizes point-to-point automatic update, and can realize the switching between any screens and the identification of EDID information through the video exchange matrix. In addition, the invention uses the FPGA programmable device as a core processing unit to realize the high-definition video transmission device which has the resolution of high-definition video (DVI and HDMI) meeting 1600 multiplied by 1200 and 60Hz and is automatically compatible downwards and EDID is automatically updated, thereby having larger practical application value.
Drawings
FIG. 1 is a schematic diagram of a high definition video optical transceiver according to the present invention;
FIG. 2 is a system diagram of a high-definition video remote transmission device with automatic EDID information update;
FIG. 3 receiver EDID information processing flow;
FIG. 4 transmitter EDID information processing flow;
figure 5 is a diagram of the EDID frame structure,
the device comprises a 1-EDID storage circuit, a 2-hot plug conversion circuit, a 3-video decoding module, a 4-FPGA processing module, a 5-optical module, a 6-DPLL module, a 7-EDID conversion circuit, an 8-video coding module, a 9-optical fiber, a 10-high-definition video source, 11-display equipment, a 12-sending optical transceiver and a 13-receiving optical transceiver.
Detailed Description
The invention is further illustrated with reference to the following figures and examples:
referring to fig. 1 and fig. 2, the apparatus for automatically updating EDID information of a high-definition video optical transceiver according to the present invention includes a transmitting optical transceiver and a receiving optical transceiver. The transmitting optical transceiver comprises an EDID storage circuit 1, a hot plug conversion circuit 2, a video decoding module 3, an FPGA processing module 4 and an optical module 5. The EDID storage circuit 1, the hot plug conversion circuit 2 and the video decoding module 3 are respectively connected with the FPGA processing module 4, and the output of the FPGA processing module 4 is connected to the optical module 5. The receiving optical transceiver also comprises an EDID conversion circuit 7, a hot plug conversion circuit 2, a video coding module 8, an FPGA processing module 4 and an optical module 5, wherein the EDID conversion circuit 7, the hot plug conversion circuit 2, the video coding module 8 and the optical module 5 of the receiving optical transceiver are all connected with the FPGA processing module 4 in the receiving optical transceiver, and the receiving optical transceiver also comprises a DPLL module 6 (digital phase-locked loop circuit) connected with the FPGA processing module 4 of the far-end receiving optical transceiver. And the receiving optical transceiver is connected with the respective optical modules of the transmitting optical transceiver through optical fibers.
The EDID storage circuit 1 serves as an EDID information storage circuit and has a DDC channel interface protection function.
The EDID conversion circuit 7 is used for realizing DDC channel interface protection and level conversion.
The hot plug conversion circuit 2 realizes level conversion by plugging and unplugging pins and has the functions of hot plug pin interface protection and level conversion. The transmitter controls the high-low state of a hot plug pin through a logic level sent by the FPGA core processing unit and informs a main control computer to acquire EDID information through the hot plug pin; the receiver judges the state of the hot plug pin output by the display equipment through the FPGA processing module, so as to judge whether the EDID information of the display equipment can be read or not.
The video decoding and encoding module 3 mainly implements the encoding and decoding process of high-definition video, and decodes standard multi-channel serial data streams into parallel data and parallel video data to multi-channel high-speed serial data streams.
The DPLL digital phase-locked loop circuit mainly realizes pixel clock generation and resolution self-adaption function.
The FPGA processing module is a core unit of the transmitting optical transmitter and receiver. The FPGA processing module of the receiver comprises a link state detection module, an I2C processing module, an EDID storage module, an EDID framing module and an EDID sending module and is responsible for EDID information reading, verification and coding framing. The link state detection module is used for detecting whether light signals are input in the optical module, and if light input is detected, a control signal is sent to the I2C processing module to control the I2C module to read EDID information; the I2C processing module is used for realizing the standard I2C time sequence, EDID stored information can be read out from the I2C time sequence, and the module starts to read the EDID information after receiving a control signal from the link state detection module; the EDID storage module is used for storing the EDID information read by the I2C module; the EDID framing module packs the EDID information read from the display according to a certain frame format, where the frame format is shown in fig. 5 and includes a frame header identifier, EDID information, a frame tail identifier, and check information. The method comprises the steps of firstly sending a frame head identifier for marking the starting position of the EDID information before sending the EDID information, then starting to continuously send the EDID information, sending a frame tail identifier to mark the ending position of the EDID information after the EDID information is sent, and finally checking all data from the frame head to the frame tail for detecting the correctness of data received by an opposite terminal. After the frame is sealed, the EDID information sending module sends the frame to the optical module after coding and parallel-serial conversion.
The transmitter FPGA processing module comprises an EDID information receiving module, an EDID de-framing module, an EDID storage module and an I2C processing module and is responsible for extracting the EDID information de-framing, verifying and updating the information of the storage and controlling the high-definition video source to read the EDID information. The EDID information receiving module converts serial signals from the optical module into parallel signals and restores an EDID information frame structure after operations such as decoding synchronization and the like; the EDID deframing module analyzes the EDID information according to the frame structure in fig. 5, and checks to confirm the correctness of EDID information transmission. And if the data is correct, transmitting the EDID information to an EDID information storage module, and if the data is wrong, discarding the EDID information. The I2C module reads out the data stored in the EDID information storage module and then transmits the EDID information to the external memory through the I2C standard timing.
Meanwhile, the FPGA processing module is responsible for video signal acquisition, synchronous processing, framing coding and high-speed receiving and transmitting of video data, and the high-speed channels T (transmitting) and R (receiving) of the optical module are converted into high-speed uplink and downlink optical signals for remote transmission, so that video transmission and automatic EDID information updating are realized.
The transmitting and receiving device formed by the circuit modules can realize optical fiber long-distance transmission of high-definition video (1600 multiplied by 1200@60Hz resolution ratio downward compatibility) and can realize automatic updating of long-distance EDID information.
The automatic updating device for the EDID information of the high-definition video optical transmitter and receiver avoids using special instruments or tooling equipment to update the EDID, avoids unnecessary manual operation and achieves the purpose of automatically updating the EDID information of the system.
The high-definition video photoelectric conversion device mainly applied to the high-definition video optical transceiver EDID information automatic updating device can realize the remote transmission of high-definition videos (DVI and HDMI) and the automatic identification and verification of EDID information and the remote automatic updating, and can be applied to the field of industrial video monitoring.
Based on the automatic updating device for the EDID information of the high-definition video optical transmitter and receiver, in order to conveniently, quickly and accurately update the EDID information of the display device of the receiving end in the using process, the invention skillfully designs the automatic updating method for the EDID information of the high-definition video optical fiber through an EDID information acquisition module, a storage module, an information judgment module, an optical transmission module and the like.
When the method for automatically updating the EDID information of the high-definition video optical transceiver of the present invention is implemented, please refer to fig. 3, an optical module circuit of the receiver converts a received optical signal into a high-speed electrical signal, then the high-speed electrical signal is processed by the FPGA processing module, and the processed data is output by the video encoding module. Meanwhile, EDID information reading is achieved by judging whether an optical fiber link is established or not and whether a hot plug pin is inserted or not at a receiving end, data verification is achieved according to VESA standards, framing is achieved through an FPGA and packaging into a high-speed serial EDID data packet, and the high-speed serial EDID data packet is optically transmitted to a transmitting optical terminal through an optical module.
Referring to fig. 4, a video decoding module of the transmitting optical transceiver decodes an input high-definition video signal, and sends the decoded data to an FPGA processing module, the FPGA processes the decoded data and converts the processed data into high-speed serial data, and sends the high-speed serial data to an optical module circuit, and the optical module circuit converts the high-speed serial data into an optical signal and sends the optical signal to a receiving end through an optical fiber.
Meanwhile, the EDID data packet is received by the optical module at the sending end, the FPGA processing module stores the data to be updated into an external memory after unpacking, checking and comparing, and the high-definition video source reads the EDID information by changing the state of the hot plug pin. The EDID information receiving module converts serial signals from the optical module into parallel signals and restores an EDID information frame structure after operations such as decoding synchronization and the like; the EDID deframing module analyzes the EDID information according to the frame structure in fig. 5, and checks to confirm the correctness of EDID information transmission. And if the data is correct, transmitting the EDID information to an EDID information storage module, and if the data is wrong, discarding the EDID information. The I2C module reads out the data stored in the EDID information storage module and then transmits the EDID information to the external memory through the I2C standard timing.
The judgment basis of the receiver and the transmitter is as follows:
①, judging whether the optical fiber link state is connected or not according to the link state pin state output by the photoelectric conversion module.
② according to VESA E-EDID Standard, the control of reading EDID information by video signal source is realized by changing the state of hot plug pin.
③ determine when to read the EDID information based on the hot plug pin level status of the interface of the display device according to the VESA standard.
④ the transmitter internally determines whether an update is required by pre-storing the EDID information.
⑤, according to VESA E-EDID Standard, checking EDID data, writing into external memory after checking successfully, and confirming that EDID information is correct.
In conclusion, the transmitter of the automatic updating device for the EDID information of the high-definition video optical transceiver of the present invention implements the synchronous processing of video data and framing of video data, processes the EDID serial data frame returned by the receiver at the same time, and checks and stores the EDID serial data frame into the external memory and determines the LOS (light LOSs indication) signal of the optical fiber link state of the optical module; the receiver is responsible for data synchronization of the video data deframing book, and realizes automatic resolution identification, judgment of LOS signals of optical fiber link states of the optical modules, judgment of EDID information of the reading display equipment and verification. Therefore, the EDID can be prevented from being updated by using a special instrument or tooling equipment, unnecessary manual operation is avoided, the operation complexity of updating the EDID information is reduced, the maintainability of the equipment is improved, point-to-point automatic judgment, automatic updating and automatic loading can be realized under the condition of not using the tooling and not changing the connection mode, and the full-automatic updating of the EDID information is completed, so that the EDID updating method has a great practical application value.
Claims (6)
1. The device for automatically updating the EDID information of the high-definition video optical transmitter and receiver is characterized by comprising a transmitting optical transmitter and receiver, wherein the transmitting optical transmitter and receiver comprises an EDID storage circuit, a hot plug conversion circuit, a video decoding module, an FPGA processing module and an optical module; the EDID storage circuit, the hot plug conversion circuit and the video decoding module are respectively connected with the FPGA processing module, and the output of the FPGA processing module is connected to the optical module; the receiving optical transceiver also comprises an EDID storage circuit, a hot plug conversion circuit, a video coding module, an FPGA processing module and an optical module, wherein the EDID storage circuit, the hot plug conversion circuit, the video coding module and the optical module of the receiving optical transceiver are all connected with the FPGA processing module in the receiving optical transceiver, and the DPLL module is connected with the FPGA processing module of the far-end receiving optical transceiver, wherein the optical modules of the receiving optical transceiver and the transmitting optical transceiver are connected through optical fibers.
2. The apparatus according to claim 1, wherein when the remote receiving optical transceiver is powered on, the apparatus determines whether the optical link is established and the status of the hot plug pin is determined, so as to read the EDID information, verify the read information, encode framing and return the EDID information at high speed.
3. The apparatus according to claim 2, wherein the sending optical transceiver determines whether an optical link is established, receives high-speed serial data, decodes and extracts the high-speed serial data, performs data comparison and verification, updates a new version of EDID information, and realizes reading of the EDID information by the high-definition video source by changing a pin status of a hot plug pin.
4. The method for updating the EDID information of the high-definition video optical transceiver according to claim 1, wherein the transmitting optical transceiver decodes the inputted high-definition video signal, transmits the processed data to the receiving optical transceiver, converts and processes the data received by the receiving optical transceiver, and outputs the processed data to the external display device, wherein the optical receiving end reads and verifies the EDID information in the received data by determining whether the optical fiber link is established and whether the hot plug pin is inserted, frames are framed by the FPGA to be packaged into an EDID information packet and transmitted to the transmitting optical transceiver, the transmitting optical transceiver determines the state of the optical link, pulls down the hot plug pin to inhibit the high-definition reading, receives the EDID information packet through the high-speed video source transceiver module to extract, verify and determine, and does not update any more if the EDID information is consistent with the pre-stored content, or updates the external memory information otherwise, and realizing automatic updating.
5. The method according to claim 4, wherein after the optical transceiver is launched for update verification, the high definition video source reads the updated EDID information by pulling up the hot plug pin, so as to implement full automatic update of the whole process.
6. The method according to claim 4, wherein the EDID information is automatically updated and video transmission of the high definition video with a resolution of at least 1600 x 1200@60Hz is performed.
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| CN108111793A (en) * | 2018-01-03 | 2018-06-01 | 山东超越数控电子股份有限公司 | A kind of DVI signal transmission systems and its method of work based on FPGA |
| CN109309820B (en) * | 2018-11-05 | 2020-12-22 | 长芯盛（武汉）科技有限公司 | HDMI active optical cable connecting wire with monitoring and configuration functions |
| CN110853588A (en) * | 2019-10-23 | 2020-02-28 | 西安万像电子科技有限公司 | Data processing method and device |
| CN113411531B (en) * | 2021-05-19 | 2022-09-13 | 深圳爱特天翔科技有限公司 | Video transmission device |
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