CN112599083A - Data transmission method, data receiving method, sending card and receiving card of display screen - Google Patents
Data transmission method, data receiving method, sending card and receiving card of display screen Download PDFInfo
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/04—Synchronising
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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Abstract
The invention discloses a data transmission method, a receiving method, a sending card and a receiving card of a display screen, wherein the sending card receives video source data and determines display data of the display screen according to the video source data; the sending card receives the control data and the query data of the display screen; the sending card transmits the display data, the control data and the query data to the receiving card in parallel through independent data transmission channels respectively; the receiving card executes corresponding operation according to the type of the received data; the transmission efficiency of the video data in the display screen control system is improved, the display screen control system is very suitable for transmitting the video data with high color depth, high frame rate and high resolution, and the input and output bandwidths of a single receiving card are improved, so that the loading capacity of the single receiving card is enhanced, the number of the required receiving cards is reduced, the number of the receiving cards of the control system can be reduced, and the system cost and risk are reduced.
Description
Technical Field
The invention relates to the field of display screens, in particular to a data transmission method, a data receiving method, a sending card and a receiving card of a display screen.
Background
With the development of technology and the use requirements of people, the resolution of the existing LED display screen is higher and higher. With the improvement of the resolution of the LED display screen, the amount of data to be transmitted and processed is increasing when the corresponding LED display screen displays data. This puts high demands on the data transmission speed of the LED display panel during data display. However, the existing data transmission method of the LED display screen is still not well suitable for high-efficiency data transmission in high-resolution scenes.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: provided are a data transmission method, a data reception method, a transmission card and a reception card for a display screen, which can improve the data transmission efficiency of a control system for a high-resolution display screen.
In order to solve the technical problems, the invention adopts a technical scheme that:
a data transmission method of a display screen comprises the following steps:
receiving video source data, and determining display data of the display screen according to the video source data;
receiving control data and query data of the display screen;
and respectively transmitting the display data, the control data and the query data to a receiving card in parallel through independent data transmission channels.
In order to solve the technical problem, the invention adopts another technical scheme as follows:
a data receiving method of a display screen comprises the following steps:
respectively receiving display data, control data and query data sent by a sending card in parallel through independent data transmission channels;
and executing corresponding operation according to the type of the received data.
In order to solve the technical problem, the invention adopts another technical scheme as follows:
a sending card of a display screen comprises a first memory, a first processor and a first computer program which is stored on the first memory and can run on the first processor, wherein the first processor realizes each step of the data transmission method of the display screen when executing the first computer program.
In order to solve the technical problem, the invention adopts another technical scheme as follows:
a receiving card of a display screen comprises a second memory, a second processor and a second computer program which is stored on the second memory and can run on the second processor, wherein the second processor realizes each step in the data receiving method of the display screen when executing the second computer program.
The invention has the beneficial effects that: the data transmitted by the display screen is divided into display data, control data and query data through the sending card, the three data are respectively transmitted to the receiving card in parallel through independent data transmission channels, the data are divided and transmitted in parallel, the transmission efficiency of the video data in the display screen control system is improved, the video data transmission system is very suitable for transmitting the video data with high color depth, high frame rate and high resolution, the input and output bandwidths of a single receiving card are improved, the loading capacity of the single receiving card is enhanced, the required number of the receiving cards can be reduced, the number of the receiving cards of the control system can be reduced, and the system cost and the risk are reduced.
Drawings
Fig. 1 is a flowchart illustrating steps of a data transmission method for a display screen according to an embodiment of the present invention;
fig. 2 is a flowchart illustrating steps of a data receiving method for a display screen according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a transmitting card of a display end according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a receiving card of a display screen according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a data transmission system of a display screen according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a control system of a display screen according to a first embodiment of the present invention;
FIG. 7 is a diagram illustrating a structure of a transmitting card according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a sending card performing memory access according to an embodiment of the present invention;
FIG. 9 is a schematic structural diagram of a receiving card according to an embodiment of the present invention;
fig. 10 is a flowchart illustrating a process of a receiving card for receiving a data frame according to an embodiment of the present invention;
fig. 11 is a schematic structural diagram of a control system of a display screen according to a second embodiment of the present invention;
FIG. 12 is a diagram illustrating a display module and a receiving card according to an embodiment of the present invention;
FIG. 13 is a flow chart illustrating interaction between a sending card and a receiving card according to an embodiment of the present invention;
FIG. 14 is a flow chart of implementing feedback between a sending card and a receiving card in accordance with an embodiment of the present invention;
FIG. 15 is a flowchart of a channel connection status query according to an embodiment of the present invention;
description of reference numerals:
1. sending the card; 2. a first memory; 3. a first processor; 4. receiving a card; 5. a second memory; 6. a second processor; 7. a data transmission system of a display screen.
Detailed Description
In order to explain technical contents, achieved objects, and effects of the present invention in detail, the following description is made with reference to the accompanying drawings in combination with the embodiments.
Name interpretation:
aurora, an extensible lightweight link layer protocol for moving data between point-to-point serial links. This provides a transparent interface to the physical layer, allowing the proprietary protocol or industry standard protocol upper layers to conveniently use the high speed transceiver. Aurora can provide a low latency, high bandwidth and highly configurable feature set, although using very few logic resources. Use on Xilinx FPGAs is free and can be supported on ASICs at nominal cost through a separate license agreement;
xilinx FPGA: programmable logic device supplier sailing;
ASIC: a dedicated device;
binding: the high-speed lines are bound and used in parallel;
serdes is a Serling FPGA high-speed transceiver;
UFC：User Flow Control；
IP: intellectual property rights;
AXI: a bus protocol;
USER-K: a user K code;
aurora IP: intellectual property of Aurora protocol;
aurora Tx: an Aurora sending module;
aurora Rx: an Aurora receiving module;
AXIstream: AXI bus streaming;
8B 10B: the Aurora encoding bit number (input 8bit, output 10 bit);
64B 66B: the Aurora encoding number (input 64bit, output 66 bit);
CRC: cyclic redundancy check;
system Control: and (5) controlling the system.
Referring to fig. 1, a data transmission method for a display screen includes the steps of:
receiving video source data, and determining display data of the display screen according to the video source data;
receiving control data and query data of the display screen;
and respectively transmitting the display data, the control data and the query data to a receiving card in parallel through independent data transmission channels.
As can be seen from the above description, the beneficial effects of the present invention are: the data transmitted by the display screen is divided into display data, control data and query data through the sending card, the three data are respectively transmitted to the receiving card in parallel through independent data transmission channels, the data are divided and transmitted in parallel, the transmission efficiency of the video data in the display screen control system is improved, the video data transmission system is very suitable for transmitting the video data with high color depth, high frame rate and high resolution, the input and output bandwidths of a single receiving card are improved, the loading capacity of the single receiving card is enhanced, the required number of the receiving cards can be reduced, the number of the receiving cards of the control system can be reduced, and the system cost and the risk are reduced.
Further, the parallel transmission of the display data, the control data and the query data to the receiving card through independent data transmission channels respectively includes:
and respectively transmitting the display data, the control data and the query data to a receiving card in parallel through independent data transmission channels based on an Aurora protocol.
As can be seen from the above description, the data transmission is realized based on the Aurora protocol, which further improves the data transmission rate, and the data transmission rate can reach the nominal speed of Serdes.
Further, the display DATA is transmitted through a USER-DATA channel of the Aurora IP core;
the control data is transmitted through a UFC channel of the Aurora IP core;
and the query data is transmitted through a USER-K channel of the Aurora IP core.
As can be seen from the above description, the USER-DATA/UFC/USER-K channels of the Aurora IP core are used for respectively transmitting the display DATA, the control DATA and the query DATA, so that the physical independence among the parallel transmission channels can be well realized.
Furthermore, the receiving card corresponds to the display modules with preset number of blocks divided by the display screen one by one;
and receiving cards corresponding to the same display module on the display screen are connected in series.
According to the description, the receiving cards which correspond to the display modules in one-to-one correspondence are arranged according to the display modules with the preset number of the divided display screens, and the receiving cards corresponding to the display modules which belong to the same row are connected in series, so that the division and the grouping parallel display of the high-resolution video are realized, and the data transmission efficiency is further improved.
Further, the determining the display data of the display screen according to the video source data includes:
analyzing the video source data and determining display data of the display screen;
storing the display data into a first FIFO and synchronizing;
reading the display data from the first FIFO based on an AXI protocol, and writing the read display data into a memory through a burst transfer mode.
Further, the method also comprises the following steps:
the sending card receives a data reading request, and reads display data from the memory in a burst transmission mode based on an AXI protocol;
the sending card stores the read display data into a second FIFO and synchronizes the display data;
and the sending card divides and synchronizes the synchronized display data according to the preset block number.
As can be seen from the above description, synchronous writing and synchronous reading of data are realized by means of the FIFO and the AXI protocol, and the orderliness and robustness of data transmission are ensured.
Further, the method also comprises the following steps:
the sending card determines a line-field synchronizing signal of the display screen according to the video source data;
and the sending card synchronizes the display data transmitted by different receiving cards in the column according to the line-field synchronizing signal.
According to the above description, the video source data further comprises the line and field synchronizing signals of the display screen, and the line and field synchronizing signals are analyzed, so that the display synchronicity between the display modules in different columns can be realized in the process of segmenting and grouping parallel display of the video, and the reliability of video display is ensured.
Further, the sending card respectively composes the display data, the control data and the query data into a display frame, a control frame and a query frame according to a preset frame format;
and the sending card transmits the display frame, the control frame and the query frame to the receiving card in parallel through independent data transmission channels based on an Aurora protocol.
According to the description, the display data, the control data and the query data are respectively framed to form the display frame, the control frame and the query frame through the customized high-efficiency frame format, so that the ordered and high-efficiency data transmission between the sending card and the receiving card can be ensured.
Further, the display frames comprise field sync frames and video frames;
the receiving card executes corresponding operation according to the type of the received data, and the operation comprises the following steps:
the receiving card judges the type of the received data, if the data is a field synchronous frame, a field synchronous signal is generated according to the field synchronous frame to realize synchronous transmission of the data, and the field synchronous frame is subjected to transparent transmission based on an Aurora protocol;
if the video frame is the video frame, generating a line synchronization signal according to the video frame to drive the display screen to display, intercepting the video frame of a display area corresponding to the receiving card, caching the intercepted video frame in a memory, and carrying out transparent transmission on the video frame based on an Aurora protocol;
if the control frame or the query frame is the control frame or the query frame, detecting whether a receiving equipment identifier carried in the control frame or the query frame is the identifier of the receiving card, if the control frame or the query frame is the identifier of the receiving card, judging whether the control frame or the query frame carries data, if the control frame or the query frame carries the data, caching the data into an RAM, and if the control frame or the query frame does not carry the data, extracting corresponding parameters from the control frame or the query frame; if the control frame is not the identifier of the receiving card, carrying out transparent transmission on the control frame or the query frame based on an Aurora protocol;
and the receiving card respectively transmits the field synchronization frame, the video frame, the control frame and the query frame in parallel through independent data transmission channels.
As can be seen from the above description, the receiving card determines the corresponding frame type based on the different frame formats of the received data frames, so as to perform corresponding data processing, and concurrently transmits the received data frames of different types through independent data channels based on the Aurora protocol while performing data processing, thereby ensuring the effectiveness and efficiency of data transmission.
Further, the method also comprises the following steps:
and the sending card receives a feedback signal aiming at the display frame, the control frame or the query frame sent by the receiving card in real time.
As can be seen from the above description, the real-time feedback monitoring of the display video is realized by the receiving card feeding back the signal for the display frame, the control frame or the query frame.
Further, the sending card sends a connection state query frame to the receiving card;
the receiving card sends a query feedback frame containing the connection state of the forward and feedback data transmission channels to the sending card;
and the sending card determines the total channel number according to the query feedback frame sent by the receiving card.
As can be seen from the above description, the number of serial channel connections can be detected by sending the connection status query frame, so as to realize automatic identification of the number of channels.
Further, feedback signals aiming at the display data, the control data or the query data, which are sent by the receiving card, are respectively transmitted to the sending card in parallel through independent data transmission channels based on an Aurora protocol;
the data transmission channel used by the receiving card is independent from the data transmission channel used by the sending card.
It can be known from the above description that the video data return channel is designed by using the characteristic that the Aurora transmission protocol supports the independent duplex mode, and the video data return channel is not affected, and because Aurora can provide a characteristic set with low delay, high bandwidth and high configurability, the real-time performance of video return monitoring can be ensured.
Further, the method also comprises the following steps:
and the receiving card performs CRC on the data transmitted on the data transmission channel, and feeds back the CRC result to the sending card if the CRC result indicates that the data is wrong.
As can be seen from the above description, by performing CRC check on data transmitted on the data transmission channel, the data with error check is fed back immediately, so that the CRC check function is realized, and the reliability of data transmission is further ensured.
Referring to fig. 2, a data transmission system of a display screen includes a sending card and a receiving card; the transmitter card comprising a first memory, a first processor, and a first computer program stored on the first memory and executable on the first processor; the receiving card comprises a second memory, a second processor and a second computer program which is stored on the second memory and can be run on the second processor, and when the first processor executes the first computer program, each step executed by the sending card in the data transmission method of the display screen is realized;
and when the second processor executes the second computer program, the steps executed by the receiving card in the data transmission method of the display screen are realized.
The data transmission method and system of the display screen of the invention can be applied to data transmission of any type of LED display screen, especially to data transmission of display screens with high frame rate, high resolution and high pixel bit width, and are described in the following through specific embodiments:
example one
Referring to fig. 1, a data transmission method for a display screen includes the steps of:
a sending card receives video source data and determines display data of a display screen according to the video source data;
specifically, the sending card analyzes the video source data to determine the display data of the display screen;
storing the display data into a first FIFO and synchronizing;
reading the display data from the first FIFO based on an AXI protocol, and writing the read display data into a memory through a burst transfer mode;
when the sending card receives a data reading request, reading display data from the memory in a burst transmission mode based on an AXI protocol;
the sending card stores the read display data into a second FIFO and synchronizes the display data;
the sending card divides and synchronizes the synchronized display data according to the preset block number;
the sending card receives the control data and the query data of the display screen;
the sending card transmits the display data, the control data and the query data to the receiving card in parallel through independent data transmission channels respectively;
specifically, the display data, the control data and the query data are respectively transmitted to a receiving card in parallel through independent data transmission channels based on an Aurora protocol;
wherein, the display DATA is transmitted through a USER-DATA channel of an Aurora IP core;
the control data is transmitted through a UFC channel of the Aurora IP core;
the query data is transmitted through a USER-K channel of the Aurora IP core;
the receiving card executes corresponding operation according to the type of the received data;
specifically, fig. 3 is a schematic structural diagram of a usage scenario of this embodiment, and a control system for implementing data transmission on a display screen includes two parts, a display sending processing unit and a display receiving processing unit. The display sending processing unit is mainly used for receiving and sending display/control/query data to the display receiving processing unit by an external video source (comprising line and field signals), receiving display return/control feedback/query feedback data from the display receiving processing unit and the like. The display receiving processing unit receives the display/control/query data from the sending processing unit, performs driving display of the display screen, executes corresponding actions according to the control data and feeds back the data to the display sending processing unit, and feeds back the data to be queried to the display sending processing unit according to the query data;
in this embodiment, the display sending processing unit includes a sending card, and the display receiving processing unit includes a receiving card, where fig. 4 is a schematic structural diagram of the sending card, and a specific work flow thereof is as follows:
an 8K video source is input to the transmitting card through the HDMI2.1 protocol interface, the transmitting card parses out video data, the video signal is input to the video source input module, and then is input to the transmitting card memory (DDR3/DDR4) through the memory access module, and the memory access module is as shown in fig. 5: the method comprises the following steps that Write data firstly enters an FIFO module to complete data caching, synchronization and data bit width conversion, and an AXI Write module writes the data into a memory through a Write burst transmission mode; when data needs to be Read from the memory, the AXI Read module reads the data from the memory through a Read burst transmission mode from the memory, then the data enters the FIFO to complete data caching and synchronization, and finally the Read data is obtained. Assuming that 8K sending video is 8-bit color depth, the application data width of memory reading and writing is 64, the data bit width conversion which needs to be completed by FIFO is 24 to 64 bits, in addition, the data bit width conversion is not needed for reading data, because the data bit width of the following sending module, especially the single channel of Aurora IP is 64 bits, the data bit width conversion is not needed; the AXI Write and the AXI Read are simultaneously connected with a memory application interface through an AXI multiplexing module;
in an optional embodiment, the sending card respectively composes the display data, the control data and the query data into a display frame, a control frame and a query frame according to a preset frame format;
the sending card transmits the display frame, the control frame and the query frame to the receiving card in parallel through independent data transmission channels based on an Aurora protocol;
the display frames comprise field sync frames and video frames;
the receiving card executes corresponding operation according to the type of the received data, and the operation comprises the following steps:
the receiving card judges the type of the received data, if the data is a field synchronous frame, a field synchronous signal is generated according to the field synchronous frame to realize synchronous transmission of the data, and the field synchronous frame is subjected to transparent transmission based on an Aurora protocol;
if the video frame is the video frame, generating a line synchronization signal according to the video frame to drive the display screen to display, intercepting the video frame of a display area corresponding to the receiving card, caching the intercepted video frame in a memory, and carrying out transparent transmission on the video frame based on an Aurora protocol;
if the control frame or the query frame is the control frame or the query frame, detecting whether a receiving equipment identifier carried in the control frame or the query frame is the identifier of the receiving card, if the control frame or the query frame is the identifier of the receiving card, judging whether the control frame or the query frame carries data, if the control frame or the query frame carries the data, caching the data into an RAM, and if the control frame or the query frame does not carry the data, extracting corresponding parameters from the control frame or the query frame; if the control frame is not the identifier of the receiving card, carrying out transparent transmission on the control frame or the query frame based on an Aurora protocol;
the receiving card transmits the field synchronization frame, the video frame, the control frame and the query frame in parallel through independent data transmission channels respectively;
each parallel serial channel transmits frame format data, the pixel transmission uses a display frame format, the display frame comprises two frames, namely a field synchronization frame (frame header 0x00) and a video frame (frame header 0x1), the transmission of the field synchronization frame requires a transmission card to receive and analyze 8K line field synchronization signals, the field synchronization signals are analyzed, then the field synchronization frame is generated according to a data filling package required by the frame packet, taking 8K as an example, the complete field synchronization frame is filled as shown in table 1:
TABLE 1 field Sync frame Format
The video frame also supports the 3D mode, but the frame rate is reduced by half when the 3D mode is supported;
the video frame is required to be sent next, the video frame is line synchronization and pixel data, the line synchronization is embodied in that a frame header with a line number is sent at the synchronization stage of each pixel line, and then a data part containing pure pixel data is formed by taking two pixels 12Byte as a group, so that the video frame is formed by taking one line of pixels as a unit; the total length of the 8K instance single set of received card video frames is 2048 × 4320/2 × 12+12 ═ 53084172 Byte.
The 8K example video frame is shown in table 2:
table 2 video frame format
When the second line synchronizing signal comes, sending second line frame data in the same video frame format (the line number is switched to 0x01) until the sending of the 4320 th line data is finished, so that 2048x4320 pixel data are all sent to the serial channel;
in addition to sending the display frame, the sending card needs to send a control frame and a query frame, these frames are initiated and framed by the system function control module of the sending card, this frame can be transmitted one-to-one, so it needs to define the numbers of the sending and receiving devices, the serial number of the sending card is fixed to 0, the serial number of the receiving card connected to the serial channel is 1, and it is assumed that the sending card sends a control frame data 0x0001020304050607 to the receiving card No. 1, and its frame format is as shown in table 3:
table 3 control frame format
The query frame is also initiated and framed by the function control module of the sending card, and this frame may also be transmitted one-to-one, so it is necessary to define the numbers of the sending and receiving devices, the serial number of the sending card is fixed to 0, the serial number of the receiving card connected to the serial channel is 1, and it is assumed that the sending card sends a control frame data 0x0010203040506070 to the receiving card No. 1, and the frame format is shown in table 4:
table 4 query frame format
| Frame header | Sending device number | Receiving device number | Frame data |
| One byte | One byte | One byte | 8-Byte Group |
| 0x80 | 0x00 | 0x01 | 0x0010203040506070 |
Assume that this query frame header is 0x 80; if the control frame carries data, grouping by taking 8Byte as a unit; in addition, the control frame uses the USER-K channel of the Aurora IP, is physically independent from the data channel of the display frame, but shares the bandwidth on the serial channel; thus, the display frame, control frame, and query frame are all sent to the receiving card via the serial channel.
Fig. 6 is a schematic structural diagram of receiving cards, each receiving card fixedly drives a display module of a display screen connected to the receiving card, so that a video needs to be divided for transmission and display if the video is to be displayed on an LED, in this embodiment, assuming that the size of the display screen is 2048 × 4320, which is divided into a row and four rows, and four display modules in total, that is, 4 × 1 receiving cards, and the size of each display module is 2048 × 1080, as shown in fig. 6, after three data frames reach the receiving card with the column number of 1, the data frames first pass through a frame parsing module, and the working flow is shown in fig. 7:
the frame analysis module identifies the frame type according to the frame analysis condition:
if a field synchronization signal is generated for a field synchronization frame and is input to a system control module, the signal is used for controlling the system to synchronously drive the field display of the LED display screen, and simultaneously the field synchronization frame is transmitted to a frame synchronization transmitting module for synchronous transmission, wherein the synchronization mainly refers to the application clock synchronous to the Aurora IP module of the receiving card;
if the video frame data needs to generate a line synchronization signal, the line synchronization signal is input to the system control module and is used for synchronously driving the LED display screen to display lines; intercepting 2048x1080 display area data displayed by the number 1 receiving card, caching the data into a memory, and reading and writing the memory are the same as those of the sending card; the system control module is provided for refreshing and displaying image content of the LED display screen; meanwhile, the video frame is transmitted to a frame synchronization transmitting module to be transmitted transparently to a number 2 receiving card;
if the control frame or the query frame is the control frame or the query frame, firstly detecting the number of the receiving equipment, if the number is 1, sending the number to the number 1 receiving card, if the control frame and the query frame carry data, caching the data into an RAM module, extracting parameters input by control and query parameters and inputting the parameters into a system control module; if the receiving device number is not 1, continuing to transparently transmit the control frame or the query frame to the sending card 2;
thus, the receiving card 1 also receives and processes the display frame, the control frame and the query frame, three frames which are transparently transmitted to the receiving card 2 are also output to the serial channel, the receiving card 2 and the receiving card 1 are completely symmetrical, the same processing flow is adopted, the three frames are transmitted to the receiving card 3, and finally reach the receiving card No. 4 through the same processing flow, and the operation with the receiving card 1 is carried out; 2048 × 4320 video data is displayed with the line-field sync signal from the transmitting card as the sync signal.
Example two
The difference between this embodiment and the first embodiment is that the receiving card corresponds to the display modules with the preset number of blocks divided by the display screen one by one;
receiving cards corresponding to the same display module on the display screen are connected in series;
further comprising the steps of:
the sending card determines a line-field synchronizing signal of the display screen according to the video source data;
and the sending card synchronizes the display data transmitted by different receiving cards in the column according to the line-field synchronizing signal.
Specifically, according to the display module with the preset number of blocks into which the display screen is divided, the number of the set receiving cards corresponds to that of the display module, the structural schematic diagram of the control system of this embodiment is shown in fig. 8, the display receiving processing unit includes n groups of receiving cards, the receiving cards are connected in groups, and each group is connected in series; between the sending card and the receiving card, the receiving card and the receiving card are all composed of n serial channels, and the data transmitted by the serial channels is the sum of the display data, the control data and the query data in fig. 3; one serial channel corresponds to one Serdes channel, which is an independent duplex transmission and simultaneously has a transmitting channel and a receiving channel, Serdes is in a non-Bonding state, namely in a non-binding state, and n receiving cards are totally arranged in the figure.
Taking the implementation of the display processing system of 8K @120fps as an example, the control system comprises 1 sending card, 4 × 4 receiving cards, and the number of serial channels of a single group of receiving cards is 4; the rate of a single serial channel is 6.5 Gbps; the total transmission bandwidth of the system is 6.5x4x 4-104 Gbps; all serial channels in the system (between a sending card and a receiving card and between the receiving card and the receiving card) have the same speed and the same physical parameters, and can be completely symmetrical; that is, the receiving card can be exchanged at will without affecting the function; for example, any serial channel in an 8K system is 6.5Gbps and supports duplex transmission.
In this embodiment, the 8K display screen is divided into 4 × 4 — 16 blocks, the display area of each small block is 2048x1080, if the receiving cards are grouped in rows, 2048x4320 pixels need to be driven for each group of 4 serial receiving cards, the video division display schematic diagram is shown in fig. 9, after division, 4 groups of pixels pass through 4 groups of receiving cards, and then each group of pixels is sent to the first receiving card through 4 serial channels; because the 4 serial channels are not used in parallel but used independently, the 4 serial channels need to be synchronized with each other, and FIFO is selected to complete the synchronization and the data bit width conversion function; here 64 to 64 x4 data bits wide; and synchronously entering a framing sending module after the conversion is finished.
There are 4 such sets of serial-connected receiver cards in fig. 9, which all display a total of 2048x4320 pixels, the second set displays 2048x4320 pixels of fig. 9, the third set displays 2048x4320 pixels of fig. 9, and the fourth set displays 2048x4320 pixels of fig. 9; displaying a complete 8K image on the LED display screen at a frame rate of 120 fps; and the four groups of serial receiving card groups all use the line field signal sent by the sending card as a synchronous signal; each group of the series connection receiving cards realizes the transmission between the sending card and the receiving card and the transmission between the receiving card and the receiving card in the same way as the first embodiment;
figure 10 is a flow chart illustrating the operation between the sending card and the receiving card.
The next 8K video payload data transfer rate (assuming the LED display device is operating properly, there are no control frames and inquiry frames) is calculated, and the total payload data transferred for 1s is 8192 4320 48 120 bits, where 8192 is the total number of row pixels, 4320 is the total number of column pixels, 48 is the number of RGB pixels bits, and 120 is the frame rate. The video frame contains 12Byte frame headers, 4320 × 120 in 1s, and the field sync frame is also 12Byte, 120 in 1s, so the effective data transmission rate is:
(8192*4320*48*120)/(8192*4320*48*120+4320*120*96+120*96)＝99.97％；
therefore, the frame design adopted by the embodiment can enable the transmission efficiency utilization rate of Aurora to reach 99.97%.
EXAMPLE III
The difference between this embodiment and the first or second embodiment is that the method further includes the steps of:
the sending card receives a feedback signal aiming at the display frame, the control frame or the query frame sent by the receiving card in real time;
feedback signals aiming at the display data, the control data or the query data, which are sent by the receiving card, are respectively transmitted to the sending card in parallel through independent data transmission channels based on an Aurora protocol;
the data transmission channel used by the receiving card is independent from the data transmission channel used by the sending card;
in an optional embodiment, the sending card sends a connection status query frame to the receiving card;
the receiving card sends a query feedback frame containing the connection state of the forward and feedback data transmission channels to the sending card;
the sending card determines the total channel number according to the query feedback frame sent by the receiving card;
in another alternative embodiment, the method further comprises:
and the receiving card performs CRC on the data transmitted on the data transmission channel, and feeds back the CRC result to the sending card if the CRC result indicates that the data is wrong.
In the system feedback channel, this embodiment uses independent, but the same Aurora IP and configuration, and also supports a display frame, a control feedback frame, and an inquiry feedback frame, for example, when the receiving card 1 receives a control frame sent by the sending card (as shown in table 3), the receiving card system control module generates a control feedback frame according to the control frame of the sending card, and if No. 1 receiving card feeds back to the sending card, the frame is shown in table 5:
table 5 feedback frame format
| Frame header | Sending device number | Receiving device number | Frame data |
| One byte | One byte | One byte | 8-Byte Group |
| 0x09 | 0x01 | 0x00 | 0x0010203040506070 |
Assume that this control frame feedback frame header is 0x 09. The sending device number becomes 0x01 for the receiving card number 1, which is the sending card's card number 0x 00. Data is assumed to be 0x 0010203040506070. If the control feedback frame carries similar video frame pixel data, it is grouped in units of 8 bytes. In addition, the control frame feedback frame is also a UFC channel for feeding back the Aurora IP, but the feedback frame is used for feeding back the Aurora IP channel because the feedback frame is a separate duplex channel when the serial channel is noticed.
The query frame and the control frame have the same processing flow, and the query frame feedback frame and the control feedback frame have the same processing flow.
The definition of the video feedback frame is the same as table 1, when the data of the LED display screen needs to be fed back, the sending card sends a control frame (table 3) first, and sends the control frame to the last card (the number of the receiving device is 0x04) of each group of receiving cards, after receiving the control frame for requesting the video feedback, the No. 4 receiving card takes the line-field synchronizing signal obtained from the forward serial channel by the system control module as the line-field synchronizing signal for sending the feedback video, and sends 2048x1080 pixel group display frames (tables 1 and 2) in its memory, the display frames include the field synchronizing frame and the video frame to the No. 3 receiving card through the feedback serial channel, after receiving the feedback display frame, the No. 3 receiving card also makes the same flow to send 2048x1080 pixel group frames in its memory to the No. 2 receiving card through the feedback serial channel, and transparently transmits the display feedback frame data sent by the No. 4 receiving card at the same time, after receiving the feedback display frame, the receiving card No. 2 also performs the same process to send 2048 × 1080 pixel group frames in the memory of the receiving card No. 1 through the feedback serial channel, and simultaneously transparently transmits display feedback frame data sent by the receiving card No. 3 and the receiving card No. 4, after receiving the feedback display frame, the receiving card No. 1 also performs the same process to send 2048 × 1080 pixel group frames in the memory of the receiving card No. 1 through the feedback serial channel, and simultaneously transparently transmits display feedback frame data sent by the receiving card No. 2, the receiving card No. 3 and the receiving card No. 4 to the sending card, and the sending card collects pixel data of each receiving card and summarizes and displays the pixel data to form a display feedback of a real-time LED display screen, wherein the process is shown in fig. 11;
the embodiment also supports channel number detection, and the channel number detection module is specifically implemented as shown in fig. 12: after the system is powered on, the sending card firstly sends a receiving card connection state query frame (table 4) to each group of serially connected receiving cards; after the serial channel physical connection is established after the power-on, the Serdes channel used by the Aurora IP feeds back the channel connection state to the Aurora IP, the duplex channels (Tx and Rx) feed back signals independently, and the channel preparation module collects and detects the two signals to generate the connection state of each channel and reports the connection state to the system control module. The No. 1-4 receiving cards collect and report the information, pay attention to the fact that the receiving cards need to transmit the connection status of the forward and feedback serial channels, and respectively send query feedback frames to the sending cards after receiving the connection status query frames sent by the sending cards;
the Aurora IP also supports CRC check of a data channel (used for transmitting display frames), when the CRC check of frame data transmitted by the Aurora IP is wrong, namely the data transmission is wrong, a CRC check signal is output to the system control module, the system control module can receive the video frame again and update display data, and if the CRC check is wrong for many times or for a long time, a related receiving card can generate an inquiry feedback frame to transmit CRC error information to the transmitting card;
aurora has a score of 8B10B and 64B66B, with 64B66B being used in the present examples.
Example four
Referring to fig. 2, a data transmission system 7 of a display screen includes a sending card 1 and a receiving card 4;
the transmitting card 1 comprises a first memory 2, a first processor 3 and a first computer program stored on the first memory 2 and executable on the first processor 3;
the receiving card 4 comprises a second memory 5, a second processor 6 and a second computer program stored on the second memory 5 and executable on the second processor 6;
when the first processor 3 executes the first computer program, each step executed by the sending card 1 in the data transmission method for a display screen according to any one of the first to third embodiments is realized;
when the second processor 6 executes the second computer program, each step executed by the receiving card 4 in the data transmission method for a display screen according to any one of the first to third embodiments is implemented.
In summary, the present invention provides a data transmission method, a data receiving method, a sending card and a receiving card for a display screen, the data transmitted by the display screen is divided into display data, control data and query data by the sending card, and the three DATA are respectively transmitted to a receiving card in parallel through independent USER-DATA/UFC/USER-K channels based on an Aurora protocol, through data division and parallel transmission based on an Aurora protocol, the transmission efficiency of video data in a display screen control system is improved, the video data transmission method is very suitable for transmitting video data with high color depth, high frame rate and high resolution, the input and output bandwidths of a single receiving card are improved, therefore, the loading capacity of a single receiving card is enhanced, the number of the required receiving cards is reduced, the number of the receiving cards of the control system can be reduced, and the cost and the risk of the system are reduced; and a video data return channel is designed based on an Aurora protocol, so that real-time return monitoring of the display video is realized, the automatic identification function of the channel number is realized by sending the connection state query frame, the data transmission efficiency is further improved by dividing the video, synchronously displaying the video in parallel in groups and correspondingly connecting the sending card and the receiving card, the connected channel supports a single-channel or multi-channel connection mode, the speed range of a single connecting line is 3.25Gbps to 6.5Gbps, under the condition of using a single connection, 4-8 lines can meet cascade transmission of 4K and 8K LED control systems, the design can use multi-path connecting lines (here, we use non-Bonding, so that theoretically, the multi-path connection lines can be arbitrarily used) under the condition of realizing a high frame rate of 120fps, if the low-cost FPGA is used, a plurality of connecting wires can be used to reduce the cost; the high rate and low delay of the system transmission enable the strict synchronization of video transmission.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent changes made by using the contents of the present specification and the drawings, or applied directly or indirectly to the related technical fields, are included in the scope of the present invention.
Claims (17)
1. A data transmission method of a display screen is characterized by comprising the following steps:
receiving video source data, and determining display data of the display screen according to the video source data;
receiving control data and query data of the display screen;
and respectively transmitting the display data, the control data and the query data to a receiving card in parallel through independent data transmission channels.
2. The data transmission method of the display screen according to claim 1, wherein the transmitting the display data, the control data and the query data to the receiving card in parallel through independent data transmission channels respectively comprises:
and respectively transmitting the display data, the control data and the query data to a receiving card in parallel through independent data transmission channels based on an Aurora protocol.
3. The data transmission method of claim 2, wherein the transmitting the display data, the control data and the query data in parallel to the receiving card through independent data transmission channels based on an Aurora protocol respectively comprises:
the display DATA is transmitted to a receiving card through a USER-DATA channel of the Aurora IP core;
the control data is transmitted to a receiving card through a UFC channel of the Aurora IP core;
and the query data is transmitted to the receiving card through a USER-K channel of the Aurora IP core.
4. The method as claimed in claim 1, wherein the determining the display data of the display screen according to the video source data comprises:
analyzing the video source data and determining display data of the display screen;
storing the display data into a first FIFO and synchronizing;
reading the display data from the first FIFO based on an AXI protocol, and writing the read display data into a memory through a burst transfer mode.
5. The data transmission method of the display screen according to claim 4, wherein the data transmission method further comprises the steps of:
receiving a data reading request, and reading display data from the memory in a burst transmission mode based on an AXI protocol;
storing the read display data into a second FIFO and synchronizing;
and dividing and synchronizing the synchronized display data according to the preset block number of the display module.
6. The data transmission method of the display screen according to claim 4 or 5, wherein the receiving cards corresponding to the same display module are connected in series;
the data transmission method further comprises the steps of:
determining a line-field synchronizing signal of the display screen according to the video source data;
and synchronizing the display data transmitted by different receiving cards in the column according to the line-field synchronizing signal.
7. The data transmission method of the display screen according to claim 2 or 3, wherein the parallel transmission of the display data, the control data and the query data to the receiving card through independent data transmission channels based on the Aurora protocol comprises:
respectively forming a display frame, a control frame and a query frame by the display data, the control data and the query data according to a preset frame format;
and respectively transmitting the display frame, the control frame and the query frame to a receiving card in parallel through independent data transmission channels based on an Aurora protocol.
8. The data transmission method of the display screen according to claim 7, wherein the data transmission method further comprises the steps of:
and receiving a feedback signal aiming at the display frame, the control frame or the query frame sent by the receiving card in real time.
9. The data transmission method of the display screen according to claim 8, wherein the receiving the feedback signal for the display frame, the control frame or the query frame sent by the receiving card in real time comprises:
sending a connection state query frame to the receiving card;
receiving an inquiry feedback frame containing the connection state of a forward and feedback data transmission channel from the receiving card;
and determining the total channel number according to the query feedback frame.
10. A data receiving method of a display screen is characterized by comprising the following steps:
respectively receiving display data, control data and query data sent by a sending card in parallel through independent data transmission channels;
and executing corresponding operation according to the type of the received data.
11. The data receiving method of claim 10, wherein the receiving of the display data, the control data and the query data sent by the sending card in parallel through the independent data transmission channels respectively comprises:
the display data, the control data and the query data respectively form a display frame, a control frame and a query frame according to a preset frame format;
and respectively receiving the display frame, the control frame and the query frame which are sent by the sending card in parallel through independent data transmission channels based on an Aurora protocol.
12. The data receiving method for a display screen according to claim 11, wherein the display frames include field sync frames and video frames;
the executing the corresponding operation according to the type of the received data includes:
judging the type of the received data, if the received data is a field synchronization frame, generating a field synchronization signal according to the field synchronization frame to realize synchronous transmission of the data, and carrying out transparent transmission on the field synchronization frame based on an Aurora protocol;
if the video frame is the video frame, generating a line synchronization signal according to the video frame to drive the display screen to display, intercepting the video frame of a display area corresponding to the receiving card, caching the intercepted video frame in a memory, and carrying out transparent transmission on the video frame based on an Aurora protocol;
if the control frame or the query frame is the control frame or the query frame, detecting whether a receiving equipment identifier carried in the control frame or the query frame is the identifier of the receiving card, if the control frame or the query frame is the identifier of the receiving card, judging whether the control frame or the query frame carries data, if the control frame or the query frame carries the data, caching the data into an RAM, and if the control frame or the query frame does not carry the data, extracting corresponding parameters from the control frame or the query frame; if the control frame is not the identifier of the receiving card, carrying out transparent transmission on the control frame or the query frame based on an Aurora protocol;
and respectively transmitting the field synchronization frame, the video frame, the control frame and the query frame in parallel through independent data transmission channels.
13. The data receiving method of claim 10, wherein the data receiving method further comprises the steps of:
and sending a feedback signal aiming at the display data, the control data or the query data to the sending card in real time.
14. The method for receiving data of a display screen according to claim 13, wherein the sending a feedback signal for the display data, the control data or the query data to the sending card in real time comprises:
respectively transmitting feedback signals aiming at the display data, the control data or the query data to the sending card in real time through independent data transmission channels based on an Aurora protocol;
the used data transmission channel is independent from the data transmission channel used by the sending card.
15. The data receiving method of the display screen according to claim 10, wherein the data receiving method further comprises:
and performing CRC on the data transmitted on the data transmission channel, and feeding back the CRC result to the sending card if the CRC result indicates that the data is wrong.
16. A transmitter card for a display screen, comprising a first memory, a first processor and a first computer program stored in the first memory and executable on the first processor, wherein the first processor executes the first computer program to implement the steps of a method for transmitting data of a display screen according to any one of claims 1 to 9.
17. A receiving card for a display screen, comprising a second memory, a second processor and a second computer program stored on said second memory and executable on said second processor,
the second processor, when executing the second computer program, implements the steps of a data receiving method for a display screen according to any one of claims 10 to 15.
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| CN114422769A (en) * | 2022-01-18 | 2022-04-29 | 深圳市洲明科技股份有限公司 | Transmitting card, receiving card, display control method and storage medium of display system |
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| CN112599083B (en) | 2022-09-06 |
| WO2022134560A1 (en) | 2022-06-30 |
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