CN115833946A

CN115833946A - All-optical bidirectional transmission system based on MIPI DPHY protocol

Info

Publication number: CN115833946A
Application number: CN202310060325.8A
Authority: CN
Inventors: 俞剑明; 王祚栋; 毛蔚; 白昀
Original assignee: Fei Ang Innovation Technology Nantong Co ltd
Current assignee: Fei Ang Innovation Technology Nantong Co ltd
Priority date: 2023-01-17
Filing date: 2023-01-17
Publication date: 2023-03-21

Abstract

The invention provides an all-optical bidirectional transmission system based on MIPIDPHY protocol, belonging to the field of signal transmission, the all-optical bidirectional transmission system comprises: a first chip and a second chip; the first chip is connected with the second chip through an optical fiber; the first chip is used for acquiring a first initial signal of the first mobile industry processor interface, converting the first initial signal into a first optical signal and transmitting the first optical signal to the second chip through an optical fiber; the second chip is used for converting the first optical signal into a first electric signal and sending the first electric signal to the second mobile industry processor interface; the roles of the second chip and the first chip can also be interchanged, and the second initial signal of the second mobile industry processor interface is transmitted to the first mobile industry processor interface. The data transmission between the two interfaces is realized through the optical fiber, the stability of the data transmission is improved, and the data transmission distance is prolonged.

Description

All-optical bidirectional transmission system based on MIPI DPHY protocol

Technical Field

The invention relates to the field of signal transmission, in particular to an all-optical bidirectional transmission system based on MIPI DPHY protocol.

Background

With the continuous development of communication technology, the DPHY communication of the MIPI (Mobile Industry Processor Interface) association has been widely applied to embedded device communication, camera data transmission, and display screen display data transmission. The output of the mainstream image sensor chip in the market supports the output mode (based on MIPI DPHY) of MIPI CSI (Camera Interface). A number of embedded Display systems also employ MIPI DSI (Display Interface) (based on MIPI DPHY). The MIPI DPHY technology itself is also continuously developed, and MIPI DPHY version one supports the highest speed of 1500Mbps without skew (skew compensation), supports the highest speed of 2500Mbps with skew, and develops to version three, and after equalization, the highest speed can support 9000Mbps, and will also develop toward higher transmission speed in the future.

However, MIPI DPHY is more suitable for short-distance high-speed transmission, such as embedded processor-to-display screen, camera-to-embedded processor. For some applications requiring long-distance communication, such as a vehicle-mounted camera, a vehicle-mounted display screen is connected with a main control unit, and a similar system more adopts a single-channel high-speed serial transmission protocol for converting an MIPI DPHY protocol into a custom protocol through multiple channels, and performs serial transmission through a coaxial line or a shielded twisted pair. The copper wire has the defects of large volume, heavy weight, large transmission damage, electromagnetic radiation, easy electromagnetic interference and the like when being used for long-distance communication in the realization. Meanwhile, due to the limitation of the bandwidth of long-distance copper wire transmission, the signal transmission bandwidth is also limited, so that the structure cannot keep pace with the development of the MIPI DPHY protocol. In addition, in the field of security monitoring, medical image transmission and display, and military image transmission and display, the method applied in the long-distance image transmission application is to convert an MIPI DPHY signal into a universal interface such as USB, ethernet, HDMI, displayport and DVI in a protocol conversion mode and then carry out long-distance transmission.

In view of the foregoing, there is a need for a high bandwidth, long distance, low electromagnetic radiation, lightweight, low cost transmission system.

Disclosure of Invention

The invention aims to provide an all-optical bidirectional transmission system based on an MIPI DPHY protocol, which can prolong the transmission distance when data is transmitted through the MIPI DPHY protocol, reduce electromagnetic radiation and improve the stability of data transmission.

In order to achieve the purpose, the invention provides the following scheme:

an all-optical bidirectional transmission system based on MIPI DPHY protocol comprises: a first chip and a second chip;

the first chip is connected with a first mobile industry processor interface; the second chip is connected with a second Mobil industry processor interface; the first chip is connected with the second chip through an optical fiber;

the first chip is used for acquiring a first initial signal of a first mobile industry processor interface, converting the first initial signal into a first optical signal and transmitting the first optical signal to the second chip through an optical fiber;

the second chip is used for converting the first optical signal into a first electric signal and sending the first electric signal to the second Mobil industry processor interface;

the second chip is further configured to obtain a second initial signal of the second mobile industry processor interface, convert the second initial signal into a second optical signal, and transmit the second optical signal to the first chip through an optical fiber;

the first chip is further configured to convert the second optical signal into a second electrical signal and send the second electrical signal to the first mobile industry processor interface.

Optionally, the first chip comprises a first transmission channel and a second transmission channel; the second chip comprises a third transmission channel and a fourth transmission channel; the first transmission channel is connected with the third transmission channel through an optical fiber, and the second transmission channel is connected with the fourth transmission channel through an optical fiber;

the first optical signal comprises a first ALP optical signal, a first LP optical signal and a first high-speed optical signal; the first electrical signal includes original first ALP data, original first LP data, and original first high-speed data; the second optical signal comprises a second ALP optical signal, a second LP optical signal and a second high-speed optical signal; the second electrical signal includes original second ALP data, original second LP data, and original second high speed data;

the first transmission channel is used for acquiring a first initial signal of a first mobile industry processor interface, detecting first ALP data, first high-speed data and first LP data in the first initial signal, converting the first ALP data into a first ALP optical signal, converting the first high-speed data into a first high-speed optical signal, transmitting the first ALP optical signal and the first high-speed optical signal to the third transmission channel through an optical fiber, and sending the first LP data to the second transmission channel;

the third transmission channel is used for converting the first ALP optical signal into a first ALP electric signal to obtain original first ALP data, converting the first high-speed optical signal into a first high-speed electric signal to obtain original first high-speed data and sending the original first high-speed data to the second mobile industry processor interface;

the second transmission channel is used for performing analytic coding on the first LP data to obtain a first LP electric signal, converting the first LP electric signal into a first LP optical signal, and transmitting the first LP optical signal to the fourth transmission channel through an optical fiber;

the fourth transmission channel is configured to convert the first LP optical signal into a second LP electrical signal, decode the second LP electrical signal to obtain a third LP electrical signal, and send the third LP electrical signal to the third transmission channel;

the third transmission channel is further configured to determine original first LP data from the third LP electrical signal and send the original first LP data to the second mobile industry processor interface;

the third transmission channel is further configured to acquire a second initial signal of a second mobile industry processor interface, detect second ALP data, second high-speed data, and second LP data in the second initial signal, convert the second ALP data into a second ALP optical signal, convert the second high-speed data into a second high-speed optical signal, transmit the second ALP optical signal and the second high-speed optical signal to the first transmission channel through an optical fiber, and send the second LP data to the fourth transmission channel;

the first transmission channel is further configured to convert the second ALP optical signal into a second ALP electrical signal to obtain original second ALP data, convert the second high-speed optical signal into a second high-speed electrical signal to obtain original second high-speed data, and send the original second high-speed data to the first mobile industry processor interface;

the fourth transmission channel is further configured to perform parsing and encoding on the second LP data to obtain a fourth LP electrical signal, convert the fourth LP electrical signal into a second LP optical signal, and transmit the second LP optical signal to the second transmission channel through an optical fiber;

the second transmission channel is further configured to convert the second LP optical signal into a fifth LP electrical signal, decode the fifth LP electrical signal to obtain a sixth LP electrical signal, and send the sixth LP electrical signal to the first transmission channel;

the first transmission channel is further configured to determine raw second LP data from the sixth LP electrical signal and send the raw second LP data to the first mobile industry processor interface.

According to the specific embodiment provided by the invention, the invention discloses the following technical effects:

the first chip is connected with the first mobile industry processor interface, the second chip is connected with the second mobile industry processor interface, the first chip is connected with the second chip through an optical fiber, a first initial signal of the first mobile industry processor interface is obtained through the first chip, the first initial signal is converted into a first optical signal, the first optical signal is transmitted to the second chip through the optical fiber, the first optical signal is converted into a first electric signal through the second chip, and the first electric signal is sent to the second mobile industry processor interface. Data transmission between two interfaces is realized through optic fibre, because the essence of optical fiber communication, does not have electromagnetic radiation in the transmission course, also can not receive electromagnetic interference, and then improves data transmission's stability to can realize long distance data transmission.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.

Fig. 1 is a schematic diagram of the overall structure of the MIPI DPHY all-optical bidirectional transmission system of the present invention;

FIG. 2 is a schematic diagram of a basic structure of a transmission channel;

FIG. 3 is a schematic view of a multi-channel configuration;

FIG. 4 is a schematic diagram illustrating the transmission process of the LP signal;

FIG. 5 is a schematic diagram of the transmission process of ALP signal;

FIG. 6 is a schematic diagram of the structure of the main I3C/I2C side of the bi-directional transmission of I3C/I2C and other low-speed signals;

FIG. 7 is a schematic diagram of the structure of the I3C/I2C and other low-speed signals transmitted from the I3C/I2C side in two directions;

fig. 8 is a schematic diagram of a general system structure of an MIPI DPHY all-optical bidirectional transmission system with a protocol conversion chip added at one end;

fig. 9 is a schematic diagram of a basic structure of conventional MIPICSI long-distance transmission;

fig. 10 is a schematic diagram of the basic structure of MIPICSI all-optical long-range transmission according to the present invention;

fig. 11 is a schematic diagram of an MIPI DPHY all-optical bidirectional universal transmission system in a camera signal transmission application;

fig. 12 is a schematic diagram of a basic structure of a conventional MIPI DSI long-distance transmission;

fig. 13 is a schematic diagram of the basic structure of MIPI DSI all-optical long-range transmission according to the present invention;

fig. 14 is a schematic diagram of an MIPI DPHY all-optical bidirectional general transmission system in a display screen signal transmission application.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.

The invention aims to provide an all-optical bidirectional transmission system based on an MIPI DPHY protocol, which does not have electromagnetic radiation and electromagnetic interference in the transmission process due to the nature of optical fiber communication, so that the data transmission between two interfaces is realized through optical fibers, the stability of the data transmission is further improved, and the long-distance data transmission is realized.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.

Example one

As shown in fig. 1, the all-optical bidirectional transmission system based on the MIPI DPHY protocol provided in this embodiment includes: the chip comprises a first chip and a second chip.

The first chip is connected with a first mobile industry processor MIPI DPHY interface. The second chip interfaces with a second mobile industry processor. The first chip is connected with the second chip through an optical fiber.

The first chip is used for acquiring a first initial signal of a first mobile industry processor interface, converting the first initial signal into a first optical signal, and transmitting the first optical signal to the second chip through an optical fiber.

The second chip is used for converting the first optical signal into a first electric signal and sending the first electric signal to the second Mobil industry processor interface.

The second chip is further configured to obtain a second initial signal of the second mobile industry processor interface, convert the second initial signal into a second optical signal, and transmit the second optical signal to the first chip through an optical fiber.

The MIPI DPHY signal is modulated to an optical signal for long-distance transmission, and the optical signal is restored to the original electric signal, namely the MIPI DPHY signal, at a receiving end. All data and control signals are transmitted using optical fibers. Because the optical fiber is light and flexible, the number of transmission channels is not limited like a copper wire, and therefore, a single optical fiber or a plurality of optical fibers can be used for signal transmission. Meanwhile, due to the essence of optical fiber communication, the transmission of the optical fiber communication is free from electromagnetic radiation and electromagnetic interference, so that the optical fiber communication is particularly friendly to the application in the fields of vehicle-mounted, military industry, security protection, medical use and the like. And the optical fiber transmission is extremely difficult to eavesdrop without destroying the communication, so the safety of the optical fiber transmission is not doubtful. The transmission speed of the single channel of the optical fiber communication can reach 100Gbps, and the larger communication bandwidth can be realized by matching with more channels, so that the continuously developed communication bandwidth requirement is met.

Further, as shown in fig. 2, the first chip includes a first transmission channel and a second transmission channel. The second chip comprises a third transmission channel and a fourth transmission channel. The first transmission channel is connected with the third transmission channel through an optical fiber, and the second transmission channel is connected with the fourth transmission channel through an optical fiber.

In this embodiment, the number of the first transmission channel, the second transmission channel, the third transmission channel and the fourth transmission channel is plural. The first transmission channel and the third transmission channel are high-speed channels, and the second transmission channel and the fourth transmission channel are low-speed channels. As a specific embodiment, as shown in fig. 3, the first chip and the second chip each include N high speed channels and K low speed channels. The number of the high-speed channels and the low-speed channels can be selected in any combination according to the specific communication requirements so as to match different MIPI DPHY interface configurations in practical application.

High-speed data, ALP data and clock signals of an Escape mode in the MIPI DPHY interface are subjected to photoelectric and electro-optical conversion transmission through a high-speed channel. The low-speed data (LP signals) in the MIPI DPHY interface, I3C/I2C and other general low-speed interfaces are subjected to time division multiplexing through one or more low-speed channels, encoded and then subjected to photoelectric and electro-optical conversion transmission. For the characteristics of special high-speed signals, a signal scrambling and descrambling mode can be selected, so that direct current balance is ensured as much as possible in the signal transmission process, and the transmission requirement of optical communication is met.

The first optical signal includes a first ALP optical signal, a first LP optical signal, and a first high-speed optical signal. The first electrical signal includes original first ALP data, original first LP data, and original first high speed data. The second optical signal includes a second ALP optical signal, a second LP optical signal, and a second high-speed optical signal. The second electrical signal includes original second ALP data, original second LP data, and original second high speed data.

The first transmission channel is used for acquiring a first initial signal of a first mobile industry processor interface, detecting first ALP data, first high-speed data and first LP data in the first initial signal, converting the first ALP data into a first ALP optical signal, converting the first high-speed data into a first high-speed optical signal, transmitting the first ALP optical signal and the first high-speed optical signal to the third transmission channel through an optical fiber, and sending the first LP data to the second transmission channel.

Specifically, the first high-speed data is high-speed data of 80Mbps to 9Gbps/Lane in a high-speed signal mode. It should be noted that the first high speed data changes according to the rate change of data in the future high speed signal mode, i.e. may have a higher rate.

The third transmission channel is configured to convert the first ALP optical signal into a first ALP electrical signal to obtain original first ALP data, convert the first high-speed optical signal into a first high-speed electrical signal to obtain original first high-speed data, and send the original first high-speed data to the second mobile industry processor interface.

The second transmission channel is configured to perform parsing and encoding on the first LP data to obtain a first LP electrical signal, convert the first LP electrical signal into a first LP optical signal, and transmit the first LP optical signal to the fourth transmission channel through an optical fiber.

The fourth transmission channel is configured to convert the first LP optical signal into a second LP electrical signal, decode the second LP electrical signal to obtain a third LP electrical signal, and send the third LP electrical signal to the third transmission channel.

The third transmission channel is further configured to determine raw first LP data from the third LP electrical signal and send the raw first LP data to the second mobile industry processor interface.

The third transmission channel is further configured to acquire a second initial signal of a second mobile industry processor interface, detect second ALP data, second high-speed data, and second LP data in the second initial signal, convert the second ALP data into a second ALP optical signal, convert the second high-speed data into a second high-speed optical signal, transmit the second ALP optical signal and the second high-speed optical signal to the first transmission channel through an optical fiber, and send the second LP data to the fourth transmission channel.

The first transmission channel is further configured to convert the second ALP optical signal into a second ALP electrical signal to obtain original second ALP data, convert the second high-speed optical signal into a second high-speed electrical signal to obtain original second high-speed data, and send the original second high-speed data to the first mobile industry processor interface.

The fourth transmission channel is further configured to perform parsing and encoding on the second LP data to obtain a fourth LP electrical signal, convert the fourth LP electrical signal into a second LP optical signal, and transmit the second LP optical signal to the second transmission channel through an optical fiber.

The second transmission channel is further configured to convert the second LP optical signal into a fifth LP electrical signal, decode the fifth LP electrical signal to obtain a sixth LP electrical signal, and send the sixth LP electrical signal to the first transmission channel.

Furthermore, the first transmission channel is further configured to obtain a clock sequence and a 0-1 value of the first mobile industry processor interface in the escape mode, convert the clock sequence into a clock optical signal, transmit the clock optical signal to the third transmission channel through an optical fiber, and send the 0-1 value to the second transmission channel.

The second transmission channel is further configured to convert the 0-1 value into an optical signal with a 0-1 value, and transmit the optical signal with a 0-1 value to the fourth transmission channel through an optical fiber.

And the fourth transmission channel is also used for converting the 0-1 value optical signal into a 0-1 value electric signal and sending the 0-1 value electric signal to the third transmission channel.

And the third transmission channel is also used for converting the clock optical signal into a clock electrical signal, reconstructing an escape signal according to the clock electrical signal and the 0-1 value electrical signal, and sending the escape signal to the second mobile industry processor interface.

Specifically, for the Escape mode in the LP signal transmission, the MIPI DPHY high-speed channel a (first transmission channel) resolves a sequence that the Escape mode enters, and then exclusive-ors the anode and the cathode to obtain a clock signal of the Escape mode, the signals are always in direct current balance and transmitted through the optical path through the high-speed channel a (first transmission channel), and the values of specific 0 and 1 in the Escape mode are forwarded through the low-speed channel a (second transmission channel), transmitted to the low-speed channel B (fourth transmission channel) through the optical path, and then transmitted to the high-speed channel B (third transmission channel). After receiving the clock signal of the Escape mode, the high-speed channel B (third transmission channel) acquires 0 and 1 signals of Escape from the low-speed channel B (fourth transmission channel) by using the clock signal, reconstructs the Escape signal and outputs the signal to an output stage.

As a preferred embodiment, the first transmission channel includes: the device comprises a first data transmission module, a first LP detection control module, a first ALP detection control module, a transmitting module, a receiving module, a second ALP detection control module, a second LP detection control module and a second data transmission module.

The first data transmission module is used for acquiring a first initial signal of a first mobile industry processor interface and detecting first high-speed data in the first initial signal. Specifically, as shown in fig. 2, the first data transmission module includes a low power consumption receiver (LP-RX), a high speed receiver (HS-RX), a high speed transmitter (HS-TX), and a low power consumption transmitter (LP-TX).

The first LP detection control module is respectively connected with the first data transmission module and the second transmission channel, and is used for detecting first LP data in the first initial signal and sending the first LP data to the second transmission channel.

The first ALP detection control module is connected to the first data transmission module, and is configured to detect first ALP data in the first initial signal.

The transmitting module is connected with the first data transmission module and the first ALP detection control module, and is used for converting the first ALP data into a first ALP optical signal, converting the first high-speed data into a first high-speed optical signal, and transmitting the first ALP optical signal and the first high-speed optical signal to the third transmission channel through an optical fiber. In this embodiment, the transmitting module is a transmitting circuit. The transmitting circuit of the high-speed channel transmits only a high-speed signal, ALP data (ALP-00 signal converted to average dc optical signal), and a clock signal in Escape mode. Where the high speed signals are optionally scrambled. When the LP signal is received, the high-speed channel transmitting circuit outputs an average direct current optical signal. The direct current balance of signals is ensured, and the requirement of high-speed optical path transmission is met.

The receiving module is connected with the third transmission channel through an optical fiber and used for converting the second ALP optical signal into a second ALP electric signal so as to obtain original second ALP data and converting the second high-speed optical signal into a second high-speed electric signal so as to obtain original second high-speed data. In this embodiment, the receiving module is a receiving circuit. The receiving circuit of the high-speed channel receives only the high-speed signal, the ALP data, and the clock signal in Escape mode. Where high speed signals can be selectively descrambled. The ALP-00 signal and the LP signal are detected as an alternating current los (loss) signal, and then the LP signal and the ALP-00 signal are distinguished by an LP effective signal of a low-speed channel. The direct current balance of signals is ensured, and the requirement of high-speed optical path transmission is met.

The second ALP detection control module is connected with the receiving module and used for receiving the original second ALP data.

And the second LP detection control module is connected with the second transmission channel and used for determining original second LP data according to the sixth LP electric signal.

The second data transmission module is respectively connected to the second ALP detection control module, the second LP detection control module, the receiving module, and the first mobile industry processor interface, and is configured to send the original second ALP data, the original second LP data, and the original second high-speed data to the first mobile industry processor interface. The structure of the second data transmission module is the same as that of the first data transmission module, and is not described herein again.

In this embodiment, the low speed channels (the second transmission channel and the fourth transmission channel) are responsible for transmitting the LP signals (including the data signals in the Escape mode), the bi-directional signals of I3C/I2C and other general low speed signals separated from the high speed channels (the first transmission channel and the third transmission channel). The low-speed signals are transmitted in two directions through time division multiplexing, coding, photoelectric conversion, electro-optical conversion, decoding and time division demultiplexing. To solve the problem of low-speed bidirectional data and control transmission.

In addition, the first LP detection control module is further configured to detect a direction switching sequence in the first initial signal, and switch a signal transmission direction on the first mh interface according to the direction switching sequence. Specifically, the first LP detection control module analyzes the LP signal and the LP signal sequence, and after detecting the LP sequence in the switching direction, controls the signal transmission direction on the MIPI DPHY interface through an IO (input output) direction control unit, thereby realizing support for MIPI DPHY high-speed bidirectional communication and low-speed bidirectional communication. The LP signal detection process is shown in fig. 4.

The first ALP detection control module is further configured to extract a control code in the first ALP data, and switch a signal transmission direction on the first Mobile industry processor interface according to the control code. Specifically, the first ALP detection control module parses the ALP signal and the ALP control code, and controls the input/output interface to perform direction switching when detecting that the ALP control code is a fast switching instruction. The support for the MIPIDPHY quick bidirectional communication switching is realized. The ALP signal detection process is shown in fig. 5.

Specifically, the present invention uses a phase locked loop to sample and parse the ALP signal transmission content to extract the control code therefrom. When the control code is a fast switching instruction, the transmission direction is automatically switched through the IO control unit, so that the support for the fast switching of MIPI DPHY high-speed bidirectional communication and low-speed bidirectional communication is realized.

The invention separates the high-speed signal and the low-speed signal of MIPI DPHY, the high-speed signal (including ALP signal) is directly modulated onto the optical signal for transmission, and the low-speed signal (including LP signal) is multiplexed and coded and modulated onto the special low-speed channel for transmission. The method has the advantages that high-speed optical signal transmission is realized, simultaneously, the support of MIPI DPHY on high-speed bidirectional communication and low-speed bidirectional communication is reserved through detecting an LP signal and an LP signal sequence, and the support of a quick conversion function is realized through analysis of an ALP signal and an ALP signal control code.

Further, the first chip is also connected with a master I3C protocol interface, and the second chip is also connected with a slave I3C protocol interface.

The first optical signal further comprises a first I3C protocol optical signal; the first electrical signal also includes an original first I3C protocol electrical signal.

The second transmission channel is further used for acquiring a first I3C protocol signal of the main I3C protocol interface, sequentially analyzing, time division multiplexing and coding the first I3C protocol signal to obtain a first I3C protocol electric signal, converting the first I3C protocol electric signal into a first I3C protocol optical signal, and transmitting the first I3C protocol optical signal to the fourth transmission channel through an optical fiber.

The fourth transmission channel is further configured to convert the first I3C protocol optical signal into a second I3C protocol electrical signal, sequentially perform decoding, time division demultiplexing, and analysis on the second I3C protocol electrical signal to obtain an original first I3C protocol electrical signal, and send the original first I3C protocol electrical signal to the slave I3C protocol interface.

The second optical signal further comprises a second I3C protocol optical signal; the second electrical signal also includes an original second I3C protocol electrical signal.

The fourth transmission channel is further configured to acquire a second I3C protocol signal from an I3C protocol interface, sequentially perform analysis, time division multiplexing, and encoding on the second I3C protocol signal to obtain a third I3C protocol electrical signal, convert the third I3C protocol electrical signal into a second I3C protocol optical signal, and transmit the second I3C protocol optical signal to the second transmission channel through an optical fiber.

The second transmission channel is further configured to convert the second I3C protocol optical signal into a fourth I3C protocol electrical signal, sequentially perform decoding, time division demultiplexing, and analysis on the fourth I3C protocol electrical signal to obtain an original second I3C protocol electrical signal, and send the original second I3C protocol electrical signal to the main I3C protocol interface.

In general, MIPI DPHY communication applications are also equipped with some bidirectional communication of out-of-band signals, such as CCI interfaces (I3C/I2C) common in CSI, and in other applications, other general low-speed signals are also required to be used for bidirectional data transmission or control, such as SPI, UART, GPIO, and the like. Therefore, the low-speed channels (the second transmission channel and the fourth transmission channel) of the invention also provide bidirectional transmission support for I3C/I2C and other general interface signals, and can meet the requirements of control and communication of devices at two ends on the premise of all-optical communication.

As shown in fig. 6 and 7, the low speed channel of the present invention is dedicated to transmitting low speed bidirectional signals. An I3C/I2C signal analysis unit in a low-speed channel A (a second transmission channel) is connected with a main I3C/I2C main unit, and an I2C/I3CSlave state machine in the I3C/I2C signal analysis unit transmits the SDA signal and the SCL signal and simultaneously analyzes the signal content.

The receiving unit in fig. 6 receives the SDA signal and the SCL signal sent from the I3C/I2C side in fig. 7, forwarded to the low speed channel a (second transmission channel) through the low speed channel B (fourth transmission channel), and demultiplexed. The I2C/I3CSlave state machine switches the IO direction through the first IO direction control and the second IO direction control to realize bidirectional communication along with the local SDA signal and SCL signal and the received corresponding jump state of the SDA signal and SCL signal of the opposite terminal when the transmission direction needs to be switched.

In fig. 7, the I2C/I3CSlave state machine parses the content of the signal while forwarding the SDA signal and the SCL signal, and the receiving module receives the SDA signal and the SCL signal sent by the main I3C/I2C side in fig. 6, and forwards the SDA signal and the SCL signal to the low-speed channel B (fourth transmission channel) through the low-speed channel a (second transmission channel) and demultiplexes the SDA signal and the SCL signal. And the I2C/I3CSlave state machine on the slave side switches the IO direction through the third IO direction control unit and the fourth IO direction control unit along with the corresponding jump state machine of the SDA signal and the SCL signal on the two sides when the transmission direction needs to be switched so as to realize bidirectional communication. The other general bidirectional communication transmission mode is similar to the structure of fig. 6 and 7, and the transmission state is analyzed while the information is transmitted by using a corresponding state machine, and the IO direction is switched correspondingly if necessary.

Furthermore, the all-optical bidirectional transmission system based on the MIPI DPHY protocol also comprises a protocol conversion chip. The protocol conversion chip is connected with the second mobile industry processor interface and used for converting the first electric signal at the second mobile industry processor interface into universal transmission interface data.

Specifically, as shown in fig. 8, a protocol conversion chip is added at one end of the MIPI DPHY all-optical bidirectional transmission system, so that the MIPI pci protocol can be converted into universal protocols such as USB, ethernet, HDMI, displayport, and DVI, or these universal protocols can be converted into the MIPI DSI protocol, thereby ensuring the universality of the interface while realizing the long-distance transmission of the signal optical fiber.

In the present embodiment, a light emitting device commonly used in optical communication such as VCSEL and DML can be used to convert an electrical signal into an optical signal. The optical signal is converted into an electrical signal, and the electrical signal can be received by a device commonly used in optical communication, such as a photodiode.

The all-optical bidirectional transmission system provided by the invention can be transparent to an upper layer system and can be compatible with common MIPI protocols such as CSI (channel state information) and DSI (differential signaling interface).

When the camera module is matched with a CSI protocol, the structure of the current camera module is subjected to long-distance transmission from an MIPICSI interface through a serial device and a single copper wire, then the structure is converted back to the MIPI CSI interface through a deserializer to be connected with a main controller, the MIPI CSI interface is converted into the MIPICSI interface, the MIPI CSI interface is subjected to photoelectric conversion, long-distance transmission is carried out through a single optical fiber or a plurality of optical fibers, and then the MIPICSI interface is converted back to be connected with the main controller through electro-optical conversion.

When being fit for with the DSI agreement, carry out long distance transmission from main control unit through MIPI DSI interface process serial device again with the structure that present display module is connected through single copper line, then convert back MIPI DSI interface and be connected with the display screen through deserializer again, change into from main control unit and pass through MIPI DSI interface and through photoelectric conversion, carry out long distance transmission through single or many optic fibre, then convert back MIPI DSI interface and be connected with the display screen through photoelectric conversion. The transmission bandwidth and the signal quality are improved, the weight of the cable is reduced, the electromagnetic radiation is reduced, the anti-electromagnetic interference characteristic is enhanced, and the manufacturing cost of the cable is reduced.

For better understanding of the scheme of the present invention, the following is further described with reference to the overall data transmission flow of the present invention.

By specially processing the LP data, the invention can destroy the DC balance and is not suitable for continuous transmission in optical fiber communication because cathode and anode signals which may occur for a period of time are both 0 or 1 (LP 00 and LP01 signals). After the LP signal is locally detected, the LP signal is forwarded to a low-speed channel a (a second transmission channel) and transmitted to a low-speed channel B (a fourth transmission channel), and the LP signal is demultiplexed from the signal and transmitted to a high-speed channel B (a third transmission channel). The high-speed channel a (first transmission channel) outputs a direct current average optical signal during this time to maintain the signal direct current balance. The high-speed channel B (third transmission channel) receives the direct current average optical signal, and if the LP signal demultiplexed by the low-speed channel B (fourth transmission channel) is valid at this time, the LP signal is restored in the high-speed channel B (third transmission channel).

In the ALP signal, since the cathode and the anode of the ALP00 signal are simultaneously 0, for example, when the ALP00 signal is detected at the level in the high-speed channel a (the first transmission channel), the laser driving circuit is forced to output a dc average optical signal, and when the dc average optical signal is detected in the high-speed channel B (the third transmission channel), it is further necessary to determine whether the LP signal output by the low-speed channel B (the fourth transmission channel) is valid, and if not, the LP signal is the ALP00 signal, otherwise, the LP signal is the LP signal.

Example two

In this embodiment, the all-optical bidirectional transmission system based on the MIPI DPHY protocol provided in the first embodiment is applied to camera data long-distance transmission applications, such as vehicle-mounted applications, medical applications, military applications, and security applications.

As shown in fig. 9, which is a structure commonly used in the long-distance transmission of camera data at present, the image sensing chip outputs data through the MIPICSI interface, the data of the MIPICSI is first unpacked into pixel data through the data serializer chip and then repackaged into serial data (the protocol of the serial data may be the serial transmission protocols such as FPD-LINK, GMSL, AHDL, etc.), and the serial data is transmitted over a coaxial line or shielded twisted pair line for a long distance. As shown in fig. 9, the host controller side receives a signal transmitted through the long-distance copper wire, and recovers the serial data into a data structure conforming to the MIPICSI interface through the deserializer, and transmits the data structure to the host controller for processing. Such transmission architectures have some drawbacks due to the use of long-haul copper transmission. The high requirements for impedance control and loss control of copper wires for transmitting high-speed signals are high, and the cost of the system is increased. Moreover, due to the factors such as the quality of the long-distance copper wires, the complexity of the wire harness and the cost, the number of the copper wires which can be used in the application is usually limited, and most of the camera image transmission systems with the structures in fig. 9 only use one wire. In addition, electromagnetic radiation, electromagnetic interference, safety, small signal bandwidth, etc. are problems with the system shown in fig. 9.

Fig. 10 shows that the all-optical bidirectional transmission system provided by the present invention is used for long-distance transmission, and the image sensing chip directly converts the electrical signal into the optical signal for transmission without data format conversion by using the MIPICSI interface to output data, so that the data integrity is maximally maintained. Signals are transmitted over long distances using optical fibers. In fig. 10, the host controller side receives the signal transmitted by the long-distance optical fiber, and directly restores the signal to the original MIPICSI signal through photoelectric conversion, during which the data integrity is not damaged. The structure can realize that the transmission bandwidth of a single optical fiber is larger than 25Gbps (even 56Gbps and 112Gbps), can completely meet the highest transmission bandwidth of the current MIPI DPHY, and can continuously provide support along with the continuous development of the MIPI DPHY. In addition, due to the characteristics of light weight and good flexibility of the optical fiber, the multiple optical fibers can not bring extra expenses to the system, and each DPHY channel is transmitted by using one optical fiber in application, so that the integrity of data is reserved. The transmission loss of the optical fiber is far less than that of the copper wire, the error-free transmission distance can reach more than one hundred meters and even kilometers, and the optical fiber is more suitable for large-scale automobiles, military industry, medical treatment and application in the field of security protection. Due to the waveguide transmission characteristics of the optical fiber, the transmission mode in fig. 10 has no electromagnetic radiation, electromagnetic interference resistance and wiretapping resistance.

In a specific embodiment, as shown in fig. 11, based on fig. 10, after the photoelectric conversion, the original MIPICSI signal is converted into a universal protocol such as USB, ethernet, HDMI, displayport, DVI, etc. by using a protocol conversion chip, such a video signal transmission system has the characteristics of high bandwidth, long distance, low electromagnetic radiation, electromagnetic interference resistance, light weight, low cost, etc., and meanwhile, has the characteristics of interface universality, and can be directly connected to a universal device for use.

EXAMPLE III

In this embodiment, the all-optical bidirectional transmission system based on the MIPI DPHY protocol provided in the first embodiment is applied to long-distance transmission application of display data, for example, in the fields of vehicle-mounted application, medical application, military application, and security application.

As shown in fig. 12, a structure of the conventional display data long-distance transmission is shown, in which the main controller outputs data through the mipid interface, and the data of the MIPI DSI is first unpacked into parallel data and then repackaged into serial data (the protocol of the serial data may be the serial transmission protocols such as FPD-LINK, GMSL, and AHDL), and the serial data is transmitted over a coaxial cable or shielded twisted pair cable for a long distance. As shown in fig. 12, the host controller side receives a signal transmitted through a long-distance copper wire, recovers serial data into a data structure conforming to the MIPI DSI interface through the deserializer, and transmits the data structure to the display screen for display. Such transmission architectures have some drawbacks due to the use of long-haul copper transmission. The high requirements for impedance control and loss control of copper wires for transmitting high-speed signals are high, and the cost of the system is increased. In addition, due to factors such as the quality of the long-distance copper wires, the complexity of the wire harness, and the cost, the number of copper wires that can be used in the application is generally limited, and most camera image transmission systems with the structure shown in fig. 12 only use one wire. In addition, electromagnetic radiation, electromagnetic interference, security, small signal bandwidth, etc. are problems with the system shown in fig. 12.

Fig. 13 shows that the all-optical bidirectional transmission system provided by the present invention is used for long-distance transmission of display data, and the main controller directly converts an electrical signal into an optical signal for transmission without data format conversion by using MIPI DSI interface output data, so that data integrity is maximally maintained. Signals are transmitted over long distances using optical fibers.

In another specific embodiment, as shown in fig. 14, on the basis of fig. 13, after the protocol conversion chip converts the universal protocol such as USB, ethernet, HDMI, displayport, DVI, etc. into the MIPIDSI protocol, the optical fiber is used for long-distance transmission after the optical fiber is subjected to photoelectric conversion, and finally the optical fiber is connected to the display screen in the form of a MIPI DSI interface. The display signal transmission system has the characteristics of high bandwidth, long distance, low electromagnetic radiation, electromagnetic interference resistance, light weight, low cost and the like, has the characteristic of interface universality, and can be directly connected with universal equipment for use.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to assist understanding of the system and its core concepts; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the foregoing, the description is not to be taken in a limiting sense.

Claims

1. An all-optical bidirectional transmission system based on MIPIDPHY protocol, characterized in that the all-optical bidirectional transmission system based on MIPIDPHY protocol comprises: a first chip and a second chip;

the first chip is connected with a first mobile industry processor interface; the second chip is connected with a second mobile industry processor interface; the first chip is connected with the second chip through an optical fiber;

the second chip is used for converting the first optical signal into a first electric signal and sending the first electric signal to the second mobile industry processor interface;

2. The mipid phy protocol-based all-optical bidirectional transmission system of claim 1, wherein the first chip comprises a first transmission lane and a second transmission lane; the second chip comprises a third transmission channel and a fourth transmission channel; the first transmission channel is connected with the third transmission channel through an optical fiber, and the second transmission channel is connected with the fourth transmission channel through an optical fiber;

the third transmission channel is used for converting the first ALP optical signal into a first ALP electric signal to obtain original first ALP data, converting the first high-speed optical signal into a first high-speed electric signal to obtain original first high-speed data, and sending the original first high-speed data to the second mobile industry processor interface;

the second transmission channel is configured to perform parsing and encoding on the first LP data to obtain a first LP electrical signal, convert the first LP electrical signal into a first LP optical signal, and transmit the first LP optical signal to the fourth transmission channel through an optical fiber;

3. The all-optical bidirectional transmission system based on the MIPIDPHY protocol of claim 2, wherein the first transmission channel is further configured to obtain a clock sequence and a value of 0 to 1 of a first mobile industry processor interface in escape mode, convert the clock sequence into a clock optical signal, transmit the clock optical signal to the third transmission channel through an optical fiber, and send the value of 0 to 1 to the second transmission channel;

the second transmission channel is further used for converting the 0-1 value into a 0-1 value optical signal and transmitting the 0-1 value optical signal to the fourth transmission channel through an optical fiber;

the fourth transmission channel is also used for converting the 0-1 value optical signal into a 0-1 value electric signal and sending the 0-1 value electric signal to the third transmission channel;

4. The MIPIDPHY protocol-based all-optical bidirectional transmission system of claim 2, wherein the number of the first transmission lane, the second transmission lane, the third transmission lane, and the fourth transmission lane is plural.

5. The mipid phy protocol-based all-optical bidirectional transport system of claim 2, wherein the first transport lane comprises:

the system comprises a first data transmission module, a second data transmission module and a third data transmission module, wherein the first data transmission module is used for acquiring a first initial signal of a first mobile industry processor interface and detecting first high-speed data in the first initial signal;

the first LP detection control module is respectively connected with the first data transmission module and the second transmission channel, and is used for detecting first LP data in the first initial signal and sending the first LP data to the second transmission channel;

the first ALP detection control module is connected with the first data transmission module and used for detecting first ALP data in the first initial signal;

the transmitting module is connected with the first data transmission module and the first ALP detection control module, and is used for converting the first ALP data into a first ALP optical signal, converting the first high-speed data into a first high-speed optical signal, and transmitting the first ALP optical signal and the first high-speed optical signal to the third transmission channel through an optical fiber;

a receiving module, connected to the third transmission channel through an optical fiber, for converting the second ALP optical signal into a second ALP electrical signal to obtain original second ALP data, and converting the second high-speed optical signal into a second high-speed electrical signal to obtain original second high-speed data;

the second ALP detection control module is connected with the receiving module and used for receiving the original second ALP data;

the second LP detection control module is connected with the second transmission channel and used for determining original second LP data according to the sixth LP electric signal;

a second data transmission module, respectively connected to the second ALP detection control module, the second LP detection control module, the receiving module, and the first mobile industry processor interface, for transmitting the original second ALP data, the original second LP data, and the original second high-speed data to the first mobile industry processor interface.

6. The all-optical bi-directional transmission system based on MIPIDPHY protocol according to claim 5, wherein said first LP detection control module is further adapted to detect a direction switching sequence in said first initial signal and switch the direction of signal transmission on said first Mobile industry processor interface according to said direction switching sequence.

7. The all-optical bi-directional transmission system based on the mipid phy protocol of claim 5, wherein the first ALP detection control module is further configured to extract a control code in the first ALP data, and to switch a signal transmission direction on the first mobile industry processor interface according to the control code.

8. The mipid phy protocol-based all-optical bidirectional transport system of claim 2, wherein the first chip is further interfaced with a master I3C protocol, and the second chip is further interfaced with a slave I3C protocol;

the first optical signal further comprises a first I3C protocol optical signal; the first electrical signal further comprises an original first I3C protocol electrical signal;

the second transmission channel is further configured to acquire a first I3C protocol signal of a main I3C protocol interface, sequentially perform analysis, time division multiplexing, and encoding on the first I3C protocol signal to obtain a first I3C protocol electrical signal, convert the first I3C protocol electrical signal into a first I3C protocol optical signal, and transmit the first I3C protocol optical signal to the fourth transmission channel through an optical fiber;

9. The mipid phy protocol-based all-optical bidirectional transport system of claim 2, wherein the first chip is further interfaced with a master I3C protocol, and the second chip is further interfaced with a slave I3C protocol;

the second optical signal further comprises a second I3C protocol optical signal; the second electrical signal further comprises an original second I3C protocol electrical signal;

the fourth transmission channel is further configured to acquire a second I3C protocol signal from an I3C protocol interface, sequentially perform analysis, time division multiplexing, and encoding on the second I3C protocol signal to obtain a third I3C protocol electrical signal, convert the third I3C protocol electrical signal into a second I3C protocol optical signal, and transmit the second I3C protocol optical signal to the second transmission channel through an optical fiber;

10. The MIPIDPHY protocol-based all-optical bidirectional transmission system of claim 1, further comprising a protocol conversion chip;

the protocol conversion chip is connected with the second mobile industry processor interface and used for converting the first electric signal at the second mobile industry processor interface into universal transmission interface data.