CN112564864A - ARINC818 bus link rate automatic adaptation method - Google Patents
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/234—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs
- H04N21/2343—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs involving reformatting operations of video signals for distribution or compliance with end-user requests or end-user device requirements
- H04N21/234363—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs involving reformatting operations of video signals for distribution or compliance with end-user requests or end-user device requirements by altering the spatial resolution, e.g. for clients with a lower screen resolution
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/234—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs
- H04N21/2343—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs involving reformatting operations of video signals for distribution or compliance with end-user requests or end-user device requirements
- H04N21/234381—Processing of video elementary streams, e.g. splicing of video streams or manipulating encoded video stream scene graphs involving reformatting operations of video signals for distribution or compliance with end-user requests or end-user device requirements by altering the temporal resolution, e.g. decreasing the frame rate by frame skipping
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs
- H04N21/4402—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs involving reformatting operations of video signals for household redistribution, storage or real-time display
- H04N21/440263—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs involving reformatting operations of video signals for household redistribution, storage or real-time display by altering the spatial resolution, e.g. for displaying on a connected PDA
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs
- H04N21/4402—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs involving reformatting operations of video signals for household redistribution, storage or real-time display
- H04N21/440281—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream or rendering scenes according to encoded video stream scene graphs involving reformatting operations of video signals for household redistribution, storage or real-time display by altering the temporal resolution, e.g. by frame skipping
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/50—Reducing energy consumption in communication networks in wire-line communication networks, e.g. low power modes or reduced link rate
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Abstract
The invention provides a method for automatically adapting ARINC818 bus link rate, which comprises three parts of high-speed serial transceiver link rate dynamic reconfiguration, high-speed serial transceiver link rate polling and ARINC818 protocol end line rate reconfiguration, wherein the rate handshake with a sending end is realized by using a method for dynamically reconfiguring the high-speed serial transceiver link rate at a receiving end, a line rate polling mode is used in the matching process, polling with different line rates is carried out at intervals, the link rate of the current sending end is determined by judging the link handshake state, and then the link rate matching with the sending end is realized. The ARINC818 bus link rate automatic adaptation method based on the FPGA high-speed serial transceiver can realize the self-adaptive transceiving of videos with various resolutions through the ARINC818 bus, and compared with the design of single link rate, the method can meet the self-adaptive transmission requirement of videos with various resolutions.
Description
Technical Field
The invention relates to the technical field of aviation video buses, in particular to an ARINC818 bus link rate automatic adaptation method based on an FPGA high-speed serial transceiver.
Background
An avionics digital video bus (ADVB, also called ARINC 818) is an avionics video transmission standard established based on the FC-AV standard, which enables transmission and exchange of video stream data in an optical fiber network, and specifies mapping rules between video streams and FC frames. The ADVB protocol allows link rates of 1.0625Gbps, 2.125Gbps, 3.1875Gbps, 4.25Gbps and the like. The link rate of the matched optical fiber channel is selected according to the format of the transmitted video data, so that the maximum link utilization rate can be ensured, the bandwidth loss is reduced, and the cost is reduced.
The ARINC818 video bus technology will certainly become the mainstream technology of new avionics video systems due to its unique technical advantages. The ARINC818 bus technology is deeply researched and developed, and has profound significance for the technical development of the military and commercial avionic video field in China. Therefore, we propose a method for ARINC818 bus link rate automatic adaptation based on FPGA high-speed serial transceiver.
Disclosure of Invention
The invention aims to provide an ARINC818 bus link rate automatic adaptation method based on an FPGA high-speed serial transceiver, which solves the problems that the link utilization rate can be ensured to be maximized, the bandwidth loss is reduced and the cost is reduced only by selecting the link rate of a matched optical fiber channel according to the format of transmitted video data based on the FPGA high-speed serial transceiver.
In order to achieve the purpose, the invention provides the following technical scheme:
an ARINC818 bus link rate automatic adaptation method is based on three parts of FPGA high-speed serial transceiver, including three parts of FPGA high-speed serial transceiver link rate dynamic reconfiguration, high-speed serial transceiver link rate polling and ARINC818 protocol end line rate reconfiguration, and realizes rate handshake with a sending end by using a high-speed serial transceiver link rate dynamic reconfiguration method at a receiving end, wherein a line rate polling mode is used in a matching process, polling with different line rates is carried out at intervals, and the link rate of the current sending end is determined by judging a link handshake state, so that link rate matching with the sending end is realized.
Preferably, the high-speed serial transceiver link rate is dynamically reconfigured: mainly aiming at a XILINX high-speed serial communication interface IP, a receiving end configures parameters for a high-speed serial transceiver, the line speed of the receiving end can be respectively configured to be 1.0625Gbps, 2.125Gbps, 3.1875Gbps and 4.25Gbps four ARINC818 link speeds, and the XILINX high-speed serial communication interface IP can reconfigure the internal PLL coefficient through a dynamic reconfiguration interface so as to reconfigure the link speed of a high-speed receiving and transmitting port.
Preferably, the computation relationship between the configurable PLL coefficient provided by the IP of the FPGA high-speed serial transceiver and the link line rate is
Whereinf PLLClkin In order to be an external reference clock, the clock,f PLLClkout in order to output the clock of the PLL,f LineRate the link rate of a high-speed serial transceiver.
Preferably, the method for polling the link rate of the FPGA high-speed serial transceiver comprises the following steps: whether the line rates of the receiving end and the sending end are consistent or not is judged by monitoring the link state returned by the high-speed serial transceiver, if not, the line rates of the high-speed serial transceiver are changed through parameter configuration, the judgment is carried out again until the line rates of the receiving end and the sending end are consistent, and finally, the scanning result is fed back to an ARINC818 protocol end.
Preferably, after the line rate of the high-speed serial transceiver, the adaptive scanning is implemented as follows:
the first step is as follows: first configure the high speed serial transceiver line rate to 1.0625 Gbps;
the second step is that: monitoring the link state of the high-speed serial transceiver after waiting for a period of time, if the state returns to successful handshake, executing the fourth step, otherwise executing the third step;
the third step: reconfiguring the high-speed serial transceiver line rate to other line rates, such as 2.125Gbps, 3.1875Gbps, 4.25Gbps ARINC818 link rate, and performing the second step;
the fourth step: detecting and acquiring the current line rate, fixing the configuration parameter information of the current high-speed serial transceiver IP, and exiting from the high-speed serial transceiver link rate polling state;
the fifth step: acquiring link line rate information and a working state from a high-speed serial transceiver;
and a sixth step: according to the acquired link line speed information and state, the working state of the ARINC818 protocol end is estimated, and the ARINC818 protocol end parameters are reconfigured to adapt to the receiving requirements of different video resolutions.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a method for realizing automatic adaptation of ARINC818 bus link rate based on FPGA high-speed serial transceiver, which realizes rate handshake with a transmitting end by using a method for dynamically reconfiguring the link rate of the high-speed serial transceiver at a receiving end, wherein a line rate polling mode is used in a matching process, polling with different line rates is carried out at intervals, the link rate of the current transmitting end is determined by judging the link handshake state, further, the link rate matching with the transmitting end is realized, four ARINC818 link rates of 1.0625Gbps, 2.125Gbps, 3.1875Gbps and 4.25Gbps are supported, a video state is judged by calculating a supportable video resolution range according to matched rate characteristics, so as to realize the self-adaptation capability of the whole transmitting and receiving module, in addition, the self-adaptation transmitting and receiving of videos with various resolutions through the ARINC818 bus can be realized according to an automatic rate matching method, compared with the design of single link rate, the method can meet the requirement of self-adaptive transmission of videos with various resolutions, and has profound significance for the technical development of the fields of military affairs and commercial avionic videos in China.
Drawings
Fig. 1 is a schematic block diagram of a link rate adaptive matching method according to the present invention.
FIG. 2 is a diagram illustrating dynamic reconfiguration parameters of a high-speed serial transceiver according to the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
Referring to fig. 1-2, the present invention provides a technical solution:
an ARINC818 bus link rate automatic adaptation method uses an FPGA high-speed serial transceiver, comprises three parts of FPGA high-speed serial transceiver link rate dynamic reconfiguration, high-speed serial transceiver link rate polling and ARINC818 protocol end line rate reconfiguration, realizes rate handshake with a sending end by using the method of high-speed serial transceiver link rate dynamic reconfiguration at a receiving end, wherein a line rate polling mode is used in a matching process, polling with different line rates is carried out at intervals, the link rate of the current sending end is determined by judging a link handshake state, and then the link rate matching with the sending end is realized.
Said high speed serial transceiver link rate dynamic reconfiguration: mainly aiming at a XILINX high-speed serial communication interface IP, a receiving end configures parameters for a high-speed serial transceiver, the line speed of the receiving end can be respectively configured to be 1.0625Gbps, 2.125Gbps, 3.1875Gbps and 4.25Gbps four ARINC818 link speeds, and the XILINX high-speed serial communication interface IP can reconfigure the internal PLL coefficient through a dynamic reconfiguration interface so as to reconfigure the link speed of a high-speed receiving and transmitting port.
The configurable PLL coefficients provided by the high speed serial transceiver IP are shown in fig. 2, and the PLL coefficients are calculated according to the link line rate as follows:
Whereinf PLLClkin In order to be an external reference clock, the clock,f PLLClkout in order to output the clock of the PLL,f LineRate for a high-speed serial transceiver link rate, the ARINC818 external common reference clock is 212.5Mhz, and the corresponding parameter configuration is shown in the following table:
TABLE 1 parameter configuration table corresponding to different line rates
Through an external dynamic configuration interface, as shown in table 1, parameters corresponding to the IP of the high-speed serial transceiver are configured, and dynamic reconfiguration of the link rate can be achieved.
The high-speed serial transceiver link rate polling: whether the line rates of the receiving end and the sending end are consistent or not is judged by monitoring the link state returned by the high-speed serial transceiver, if not, the line rates of the high-speed serial transceiver are changed through parameter configuration, the judgment is carried out again until the line rates of the receiving end and the sending end are consistent, and finally, the scanning result is fed back to an ARINC818 protocol end.
The implementation steps of the line rate adaptive scanning are as follows:
the first step is as follows: first configure the high speed serial transceiver line rate to 1.0625 Gbps;
the second step is that: monitoring the link state of the high-speed serial transceiver after waiting for a period of time, if the state returns to successful handshake, executing the fourth step, otherwise executing the third step;
the third step: reconfiguring the high-speed serial transceiver line rate to other line rates, such as 2.125Gbps, 3.1875Gbps, 4.25Gbps ARINC818 link rate, and performing the second step;
the fourth step: detecting and acquiring the current line rate, fixing the configuration parameter information of the current high-speed serial transceiver IP, and exiting from the high-speed serial transceiver link rate polling state;
the fifth step: acquiring link line rate information and a working state from a high-speed serial transceiver;
and a sixth step: according to the acquired link line speed information and state, the working state of the ARINC818 protocol end is estimated, and the ARINC818 protocol end parameters are reconfigured to adapt to the receiving requirements of different video resolutions.
Claims (5)
1. A method for automatic adaption of ARINC818 bus link rate uses an FPGA high-speed serial transceiver, and comprises three parts of dynamic reconfiguration of the link rate of the FPGA high-speed serial transceiver, polling of the link rate of the high-speed serial transceiver and reconfiguration of the line rate of an ARINC818 protocol end, and is characterized in that: the method is characterized in that the rate handshake with the sending end is realized by using a dynamic reconfiguration method of the link rate of the high-speed serial transceiver at the receiving end, wherein the matching process uses a line rate polling mode, polling with different line rates is carried out at intervals, the link rate of the current sending end is determined by judging the link handshake state, and then the link rate matching with the sending end is realized.
2. The method for automatic ARINC818 bus link rate adaptation according to claim 1, wherein: the dynamic reconfiguration method for the link rate of the FPGA high-speed serial transceiver comprises the following steps: mainly aiming at a XILINX high-speed serial communication interface IP, a receiving end configures parameters for a high-speed serial transceiver, and configures the line rates of the high-speed serial transceiver into four ARINC818 link rates of 1.0625Gbps, 2.125Gbps, 3.1875Gbps and 4.25Gbps respectively.
3. The method of ARINC818 bus link rate auto-adaptation according to claim 2, further characterized by: the calculation relation between the configurable PLL coefficient provided by the IP of the FPGA high-speed serial transceiver and the link line rate is
Whereinf PLLClkin In order to be an external reference clock, the clock,f PLLClkout in order to output the clock of the PLL,f LineRate the link rate of a high-speed serial transceiver.
4. The method for automatic ARINC818 bus link rate adaptation according to claim 1, wherein: the high-speed serial transceiver link rate polling specifically comprises: whether the line rates of the receiving end and the sending end are consistent or not is judged by monitoring the link state returned by the high-speed serial transceiver, if not, the line rates of the high-speed serial transceiver are changed through parameter configuration, the judgment is carried out again until the line rates of the receiving end and the sending end are consistent, and finally, the scanning result is fed back to an ARINC818 protocol end.
5. The method of ARINC818 bus link rate auto-adaptation according to claim 4, wherein: after the line rate of the high-speed serial transceiver is increased, the self-adaptive scanning is realized by the following steps:
the first step is as follows: first configure the high speed serial transceiver line rate to 1.0625 Gbps;
the second step is that: monitoring the link state of the high-speed serial transceiver after waiting for a period of time, if the state returns to successful handshake, executing the fourth step, otherwise executing the third step;
the third step: reconfiguring the high-speed serial transceiver line rate to other line rates, such as 2.125Gbps, 3.1875Gbps, 4.25Gbps ARINC818 link rate, and performing the second step;
the fourth step: detecting and acquiring the current line rate, fixing the configuration parameter information of the current high-speed serial transceiver IP, and exiting from the high-speed serial transceiver link rate polling state;
the fifth step: acquiring link line rate information and a working state from a high-speed serial transceiver;
and a sixth step: according to the acquired link line speed information and state, the working state of the ARINC818 protocol end is estimated, and the ARINC818 protocol end parameters are reconfigured to adapt to the receiving requirements of different video resolutions.
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