Inter-board high-speed communication protocol based on MLVDS

Abstract

The invention discloses an inter-board high-speed communication protocol based on MLVDS, which comprises a main control module and a plurality of sub-control modules, the main control module performs point-to-many communication with the plurality of sub-control modules through an MLVDS bus, on a physical level, the MLVDS is adopted to perform one-to-many transmission of differential signals, stable transmission of high-speed data is ensured, and the differential signals have common-mode interference resistance. The accuracy and integrity of the data are ensured; in the link level, the structure of a data transmission frame is defined, the data transmission frame comprises fields of a start bit, a data load, a check bit and a stop bit, the design of the data transmission frame meets the time sequence requirement of transmission, and the compatibility and reliability of a communication protocol are ensured by adopting a transmission protocol. According to the inter-board high-speed communication protocol based on the MLVDS, a point-to-many communication mode is adopted, the transmission rate is increased, the number and weight of cables are reduced, the circuit design is simplified, and the communication reliability is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of inter-board communication, and particularly relates to an inter-board high-speed communication protocol based on MLVDS. Background Art

[0002] In existing inter-board communication, many systems adopt interfaces such as RS485 and RS422. These interfaces have the following disadvantages in high-speed data transmission scenarios:

[0003] 1. Low transmission rate: The transmission rates of RS485 and RS422 interfaces are usually low and cannot meet the requirements of modern high-speed data transmission, especially in high-speed and large-bandwidth systems.

[0004] 2. Large number of cables and heavy weight: RS485 and RS422 usually require multiple pairs of signal lines for connection, resulting in a large number of cables, increasing the complexity of wiring and the weight of the system.

[0005] 3. Complex hardware circuit design: Due to the need for multiple lines for signal transmission, the circuit design of RS485 and RS422 interfaces is complex, increasing the development cost and difficulty of the system.

[0006] 4. High system cost: More signal lines and complex hardware interfaces result in a higher overall system cost.

[0007] Therefore, in view of the above problems, further improvements are made. Summary of the Invention

[0008] The main object of the present invention is to provide an inter-board high-speed communication protocol based on MLVDS, adopting a point-to-multiple communication mode, and mainly solving the following technical problems. Improve the transmission rate, utilize the high-speed transmission characteristics of MLVDS to support a communication rate of 200 Mbps, and meet the requirements of high-bandwidth applications; reduce the number and weight of cables, simplify wiring by reducing the number of communication lines, and reduce the weight of the system; simplify the circuit design, utilize the simple differential signal transmission method of MLVDS to reduce the complexity and cost of hardware design; improve communication reliability, utilize the anti-interference ability of differential signals to ensure the reliability of data transmission; point-to-multiple communication, adopt a point-to-multiple (single point to multiple points) communication mode, and be able to achieve high-speed communication between a single master node and multiple slave nodes.

[0009] To achieve the above object, the present invention provides an inter-board high-speed communication protocol based on MLVDS, including a main control module and multiple sub-control modules. The main control module performs point-to-multiple communication with multiple sub-control modules through the MLVDS bus, wherein:

[0010] At the physical level, MLVDS is adopted for one-to-many differential signal transmission to ensure stable high-speed data transmission. Using differential signals has the ability to resist common-mode interference, ensuring the accuracy and integrity of data.

[0011] At the link level, the structure of the data transmission frame is defined, including fields such as start bit, data payload, check bit, and stop bit. The data transmission frame design conforms to the timing requirements of transmission, and transmission protocols (such as UART, SPI, etc.) are adopted to ensure the compatibility and reliability of the communication protocol.

[0012] Supports the communication mode from single point to multiple points. In this mode, the master control module controls the entire communication process, and multiple slave control modules receive and respond to the data of the master control module, which is used to flexibly adapt to the communication requirements of multiple devices.

[0013] As a further preferred technical solution of the above technical solution, for the structure of the data transmission frame:

[0014] Start bit: Used to identify the start of the data frame to ensure that the receiving party can correctly parse the data.

[0015] Data payload: The actual transmitted data, and the specific length is set according to application needs (such as 8 bits, 16 bits, or 32 bits, etc.).

[0016] Check bit: The data is verified by adopting the CRC (Cyclic Redundancy Check) algorithm to ensure error-free data transmission.

[0017] Stop bit: Used to identify the end of the data frame to ensure data integrity and assist the receiving party to correctly identify the boundary of each frame.

[0018] As a further preferred technical solution of the above technical solution, the transmission rate is 200 Mbps, and the rate is adjusted according to different application requirements.

[0019] As a further preferred technical solution of the above technical solution, in the multi-point communication mode, the master control module provides a synchronous clock signal to ensure that each slave control module performs data transmission at the same timing.

[0020] As a further preferred technical solution of the above technical solution, through CRC or other verification methods, any errors occurring during the transmission process can be detected and corrected in time to prevent the transmission of incorrect data.

[0021] The beneficial effects of the present invention are as follows:

[0022] Compared with the existing inter-board communication solutions based on traditional interfaces such as RS485 or RS422, the inter-board high-speed communication protocol based on MLVDS of the present invention has significant advantages and beneficial effects. These advantages stem from the MLVDS technology, point-to-multiple communication mode, simplified hardware design, and high-reliability data transmission adopted by the present invention, which are specifically as follows:

[0023] (I) High-speed transmission capability

[0024] 1. Higher transmission rate

[0025] The MLVDS technology adopted by the present invention has significant advantages in transmission rate. Compared with the traditional RS485 and RS422 interfaces, its theoretical transmission rate can be as high as 200 Mbps, which has a significant improvement for application scenarios that require fast and continuous transmission of a large amount of data.

[0026] ● Existing technical solutions: The transmission rates of RS485 and RS422 are usually lower than 10 Mbps, which makes them unable to cope with the transmission tasks of large amounts of data, especially in systems with high bandwidth requirements.

[0027] ● Advantages of the present invention: Due to the high-speed characteristics of MLVDS, the present invention can support higher data rates and meet the requirements of modern systems for large bandwidth and fast response.

[0028] 2. Strong adaptability and good transmission quality

[0029] When the present invention performs high-speed transmission, through the differential signal method of MLVDS technology, it can effectively suppress electromagnetic interference and common-mode noise, thereby ensuring signal integrity during long-distance transmission and avoiding signal attenuation.

[0030] ● Existing technical solutions: In RS485 and RS422 systems, problems such as signal attenuation and noise interference will affect the transmission quality. Especially in the case of long distances and high-speed data transmission, the system stability is poor.

[0031] ● Advantages of the present invention: Using the differential signal transmission of MLVDS, it can still maintain signal stability and reliability during high-speed transmission, especially suitable for data transmission in long-distance communication and high-noise environments.

[0032] (II) Simplified hardware design and reduced number of cables

[0033] 1. Reduced number of cables and lower wiring complexity

[0034] The present invention adopts MLVDS interface technology, which greatly reduces the number of cables required for connecting nodes. Compared with the traditional RS485 and RS422 interfaces, MLVDS only requires fewer signal lines for connection.

[0035] ● Existing technical solution: In the communication solutions of RS485 and RS422, each device usually requires multiple pairs of signal lines for connection, which not only increases the complexity of wiring, but also increases the weight, volume and cost of the system.

[0036] ● Advantages of the present invention: By using MLVDS technology, only a few signal lines are required during the communication process, reducing the number of cables, thus reducing the weight of the system and the complexity of wiring, and simplifying the installation and maintenance of the device.

[0037] 2. Simplification of hardware circuit design

[0038] Compared with traditional RS485 and RS422, MLVDS has a simpler hardware interface design, reducing complex circuit components in the traditional interface, such as drivers, receivers and other electrical isolation components.

[0039] ● Existing technical solution: RS485 and RS422 usually require complex hardware circuit design, including multiple signal conditioning, driving and receiving modules, which increases the design difficulty, development cycle and cost.

[0040] ● Advantages of the present invention: The MLVDS technology adopted by the present invention not only reduces the development and production costs through a simplified hardware interface circuit, but also shortens the design and development cycle and reduces the complexity of the circuit.

[0041] (III) Advantages of point-to-multipoint communication mode

[0042] 1. Flexible topology to meet multi-point communication requirements

[0043] The protocol of the present invention adopts a point-to-multipoint (single point to multiple points) communication mode. Data exchange between the master node and multiple slave nodes is carried out through the MLVDS bus, which has extremely high flexibility. The master node manages the data transmission of multiple slave nodes through a unified protocol, simplifies the communication method between multiple devices, and is convenient for expansion and management.

[0044] ● Existing technical solution: In traditional RS485 and RS422 interfaces, although multi-point communication is supported, complex topology and coordination mechanisms are still required. The communication process of each node needs to be managed independently, increasing the complexity of the system.

[0045] ● Advantages of the present invention: Through the point-to-multipoint communication mode of the present invention, the master node can communicate with multiple slave nodes efficiently, greatly simplifies the management of multi-point communication, and supports a flexible topology, adapting to scenarios of multi-device, long-distance and high-speed communication.

[0046] 2. Higher communication efficiency and stability

[0047] In the present invention, the master node directly controls the communication and data exchange of multiple slave nodes through the protocol layer, ensuring the stability and efficiency of multi-point communication.

[0048] ● Existing technical solutions: Although RS485 and RS422 interfaces support multi-point communication, in a relatively complex multi-point network, data transmission is often unstable or communication efficiency is low due to conflicts or timing issues.

[0049] ● Advantages of the present invention: Due to the point-to-multi communication mode supported by this protocol, communication conflicts can be effectively avoided, data synchronization between nodes can be ensured, and the overall communication efficiency and reliability of the system can be improved. (IV) System reliability and anti-interference ability

[0050] 1. High-reliability data transmission

[0051] The MLVDS technology adopted in the present invention has strong anti-interference ability and can maintain stable signal transmission especially in a high-noise environment. Through the differential signal method, common-mode noise and electromagnetic interference can be effectively resisted to ensure data integrity during the communication process.

[0052] ● Existing technical solutions: When RS485 and RS422 are used in high-noise or long-distance transmission, the signals are easily interfered, and the transmission quality is difficult to guarantee. Especially in high-interference scenarios such as industrial environments and vehicle-mounted systems, the communication reliability is relatively low.

[0053] ● Advantages of the present invention: Using the MLVDS technology, stable signal transmission can be maintained in a high-noise environment, ensuring data reliability, and it is especially suitable for application scenarios with extremely high requirements for communication stability such as complex industrial control and radar signal processing.

[0054] 2. Strong anti-electromagnetic interference

[0055] Due to the differential signal characteristics of MLVDS, it can effectively suppress electromagnetic interference (EMI) to ensure that it will not be affected by external interference during high-speed data transmission.

[0056] ● Existing technical solutions: Although RS485 and RS422 have certain anti-interference ability, in the case of high-speed transmission and long-distance communication, the interference problem is still prominent and easily leads to data loss and transmission errors.

[0057] ● Advantages of the present invention: MLVDS is designed considering the requirements of anti-electromagnetic interference and can provide stable signal transmission in a high-speed and large-bandwidth environment, which is an ideal communication solution in modern high-precision equipment and industrial control systems.

[0058] (V) Cost-effectiveness

[0059] 1. Reduce system cost

[0060] By reducing the number of cables and simplifying the hardware circuit design, the present invention can effectively reduce the manufacturing cost of the entire system. Due to the simplified design of the MLVDS interface, fewer external components are required and the circuit wiring is also more convenient.

[0061] ● Existing technical solutions: RS485 and RS422 systems require multiple interfaces, driver modules and complex circuit designs, so the hardware cost is relatively high.

[0062] ● Advantages of the present invention: Due to the adoption of MLVDS technology, the hardware design of the system is more concise, reducing the cost investment, and is particularly suitable for large-scale production and deployment.

[0063] 2. Reduce maintenance cost

[0064] Since the system structure is simple and there are few components, the failure rate is relatively low, thus greatly reducing the complexity and cost of maintenance.

[0065] ● Existing technical solutions: Systems with traditional RS485 and RS422 interfaces are relatively complex. When a failure occurs, it is necessary to check multiple signal paths and interfaces one by one, and the maintenance cost is relatively high.

[0066] Advantages of the present invention: The simplified design of the present invention makes the maintenance of the system more convenient, reduces the difficulty of troubleshooting, and reduces the later maintenance cost. Brief description of the drawings

[0067] Figure 1 is the block diagram of the point-to-multipoint communication mode of the present invention.

[0068] Figure 2 is the block diagram of the one-to-many differential signal transmission mode using MLVDS of the present invention. Detailed implementation manners

[0069] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments in the following description are only examples, and those skilled in the art can think of other obvious variations. The basic principles defined in the following description can be applied to other implementation schemes, variation schemes, improvement schemes, equivalent schemes and other technical schemes without departing from the spirit and scope of the present invention.

[0070] In the preferred embodiment of the present invention, those skilled in the art should note that CRC and the like involved in the present invention can be regarded as the prior art.

[0071] Preferred embodiment.

[0072] The present invention discloses a high-speed inter-board communication protocol based on MLVDS, which includes a master control module and multiple slave control modules. The master control module performs point-to-multipoint communication with the multiple slave control modules through the MLVDS bus, where:

[0073] At the physical level, MLVDS is adopted for differential signal one-to-many transmission, and its block diagram is as Figure 2 shown, ensuring stable high-speed data transmission. Using differential signals has the ability to resist common-mode interference, ensuring the accuracy and integrity of the data;

[0074] At the link level, the structure of the data transmission frame is defined, including fields such as start bit, data payload, check bit, and stop bit. The data transmission frame design conforms to the timing requirements of the transmission, and transmission protocols (such as UART, SPI, etc.) are adopted to ensure the compatibility and reliability of the communication protocol;

[0075] Supports the communication mode from single point to multiple points. In this mode, the master control module controls the entire communication process, and multiple slave control modules receive the data from the master control module and respond, which is used to flexibly adapt to the communication requirements of multiple devices.

[0076] Specifically, for the structure of the data transmission frame:

[0077] Start bit: Used to identify the start of the data frame, ensuring that the receiving party can correctly parse the data;

[0078] Data payload: The actual data to be transmitted, and the specific length is set according to application needs (such as 8 bits, 16 bits, or 32 bits, etc.);

[0079] Check bit: The data is verified by adopting the CRC (Cyclic Redundancy Check) algorithm to ensure error-free data transmission;

[0080] Stop bit: Used to identify the end of the data frame, ensuring data integrity and assisting the receiving party to correctly identify the boundary of each frame.

[0081] More specifically, the transmission rate is 200 Mbps, and the rate is adjusted according to different application requirements.

[0082] Furthermore, in the multi-point communication mode, the master control module provides a synchronous clock signal to ensure that each slave control module performs data transmission at the same timing (when transmitting between multiple boards, a synchronous clock is required to synchronize the clock signals of multiple boards. After sending data under the synchronous clock, in order to ensure synchronous processing between multiple boards, the master also needs to send a synchronous pulse signal as the inter-board synchronous instruction).

[0083] Even further, through CRC or other verification methods, any errors occurring during the transmission process can be detected and corrected in a timely manner to prevent the transmission of incorrect data, where:

[0084] During the data transmission process, frame length judgment and the number of high bits of the transmitted data are added for data verification. Specific method: The bytes after the frame header are used as the data read for the frame length (the number from the next byte of the frame length until the end of the frame), and the byte before the frame tail is used as the data for the number of high bits of the transmitted data, and this type is used as the verification judgment for the transmitted and received data.

[0085] The present invention supports a communication topology from single point to multi-point, and the main control module communicates with multiple sub-control modules through the MLVDS bus. This topology has good scalability and flexibility, and can adapt to different numbers of devices and communication requirements. Common topology forms include star, bus type, etc.

[0086] Regarding the present invention:

[0087] 1. High-speed transmission ability based on MLVDS:

[0088] This protocol uses MLVDS for point-to-multi communication, and the maximum supports a high-speed data transmission rate of 200 Mbps. The differential signal transmission method of MLVDS can maintain the integrity of data over a long distance, and its anti-interference performance is superior to traditional RS485 and RS422 interfaces. Through this, this solution effectively solves the problems of speed and stability in the existing inter-board communication protocol.

[0089] 2. Point-to-multi communication topology:

[0090] One of the creativities of this solution lies in its point-to-multi communication mode, which allows the main node (main control module) to communicate with multiple slave nodes (sub-control modules) simultaneously. The main node sends data through the MLVDS bus, and multiple slave nodes receive and respond, thus simplifying the complex communication mechanism in traditional multi-point communication. This topology can be flexibly expanded to support the connection of more devices and adapt to the needs of different scale systems.

[0091] 3. Reducing the number of cables and simplifying the hardware design:

[0092] Using MLVDS reduces the need for multiple pairs of signal lines, significantly reducing the wiring complexity and system weight. Compared with RS485 and RS422, the hardware design of the MLVDS interface is more concise, which can reduce the complexity of PCB layout and lower the circuit cost.

[0093] 4. High-reliability differential signal transmission:

[0094] The differential signal method adopted by MLVDS has natural anti-noise ability. During high-speed transmission, it can suppress common-mode interference and electromagnetic interference, ensuring high reliability of communication. Through differential transmission, the transmission quality of data can be guaranteed under long-distance and high-speed conditions, which is suitable for the communication requirements of industrial-grade, military-grade, and high-precision equipment.

[0095] 5. Scalability and flexibility of the protocol:

[0096] This solution supports various topological structures from single-point to multi-point, and can flexibly meet the communication requirements between multiple devices. By controlling the slave nodes through the master node, the communication conflicts between nodes can be effectively reduced, and the communication efficiency of the system can be improved. The system supports adaptive rate and dynamic synchronization mechanism, and can adjust the communication rate and timing according to the application scenario.

[0097] It is worth mentioning that technical features such as CRC involved in this invention patent application should be regarded as prior art. For the specific structures, working principles, possible control methods, and spatial arrangement methods of these technical features, conventional selections in the art can be adopted, and they should not be regarded as the invention points of this invention patent. This invention patent will not be further elaborated specifically.

[0098] For those skilled in the art, the technical solutions described in the foregoing embodiments can still be modified, or some of the technical features can be equivalently replaced. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A high-speed inter-board communication protocol based on MLVDS, characterized in that: It includes a main control module and multiple sub-control modules. The main control module performs point-to-multiple communication with the multiple sub-control modules via an MLVDS bus, wherein: At the physical level, MLVDS is used for one-to-many transmission of differential signals to ensure stable transmission of high-speed data. The use of differential signals has the ability to resist common-mode interference and ensure the accuracy and integrity of data. At the link level, the structure of the data transmission frame is defined, including the fields of the start bit, data payload, check bit, and stop bit. The data transmission frame design meets the timing requirements of the transmission, and the transmission protocol is used to ensure the compatibility and reliability of the communication protocol; Supports point-to-multipoint communication mode. In this mode, the main control module controls the entire communication process, and multiple sub-control modules receive data from the main control module and respond, which is used to flexibly adapt to the communication needs of multiple devices.

2. The MLVDS-based inter-board high-speed communication protocol according to claim 1, characterized in that: For the structure of data transmission frame: Start bit: used to mark the start of the data frame to ensure that the receiver can correctly parse the data; Data payload: the data actually transmitted, the specific length is set according to the application needs; Check bit: The data is checked by using the CRC algorithm to ensure that the data is transmitted correctly; Stop bit: used to mark the end of the data frame, ensure data integrity and assist the receiver in correctly identifying the boundaries of each frame.

3. The MLVDS-based inter-board high-speed communication protocol according to claim 1, characterized in that: The transmission rate is 200Mbps, and the rate can be adjusted according to different application requirements.

4. The MLVDS-based inter-board high-speed communication protocol according to claim 1, characterized in that: In multi-point communication mode, the main control module provides a synchronous clock signal to ensure that each sub-control module transmits data at the same timing.

5. The MLVDS-based inter-board high-speed communication protocol according to claim 1, characterized in that: Through CRC or other verification methods, any errors that occur during the transmission process can be discovered and corrected in time to prevent the transmission of erroneous data.

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