CN115296742A - Inter-board communication interface system - Google Patents
Inter-board communication interface system Download PDFInfo
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- CN115296742A CN115296742A CN202210764461.0A CN202210764461A CN115296742A CN 115296742 A CN115296742 A CN 115296742A CN 202210764461 A CN202210764461 A CN 202210764461A CN 115296742 A CN115296742 A CN 115296742A
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- 238000004891 communication Methods 0.000 title claims abstract description 72
- 239000013307 optical fiber Substances 0.000 claims abstract description 60
- 239000005441 aurora Substances 0.000 claims abstract description 32
- 238000011161 development Methods 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 238000011084 recovery Methods 0.000 claims description 4
- 239000000835 fiber Substances 0.000 claims description 3
- 230000003993 interaction Effects 0.000 claims description 3
- 238000012163 sequencing technique Methods 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 abstract description 35
- 238000010586 diagram Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 230000003287 optical effect Effects 0.000 description 2
- 238000013500 data storage Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2589—Bidirectional transmission
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2589—Bidirectional transmission
- H04B10/25891—Transmission components
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Abstract
The invention provides an inter-board communication interface system, comprising: the optical fiber communication units are interconnected through optical fibers; each optical fiber communication unit is provided with an optical fiber communication module as a communication interface and an Aurora protocol IP core module which is interconnected with the optical fiber communication module. The system realizes optical fiber communication interconnection based on an Aurora protocol, meets the requirements of high speed, large capacity and the like, enables data to be efficiently and correctly transmitted between cross-board cards, improves the transmission rate, realizes remote data transmission, and eliminates the interference of external equipment to superconducting equipment in an electromagnetic environment.
Description
Technical Field
The invention relates to the technical field of optical fiber communication, in particular to an inter-board communication interface system.
Background
Superconducting devices are devices for measuring extremely weak signals, such as weak changes in the electromagnetic field of the human body. The field data required to be recorded during the debugging of the superconducting equipment often reaches the high-level data, and the data is required to be transmitted and processed in real time; in addition, because the superconducting device adopts a superconducting RSFQ circuit, in an electromagnetic environment, the RSFQ circuit is easily interfered by external equipment and connecting devices due to the fact that irregular current flows, and the working performance is not stable enough.
The existing high-speed data transmission applied between circuit boards or equipment adopts a parallel transmission mode to transmit data, wherein the circuit boards are usually interconnected through cables, and the parallel data transmission mode cannot meet the timely transmission of high-frequency large-capacity data in the aspects of line interference and the like.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an inter-board communication interface system which is high in transmission rate, realizes long-distance data transmission and eliminates the interference of external equipment to superconducting equipment in an electromagnetic environment.
In order to achieve the above object, an aspect of the present invention provides an inter-board communication interface system, including: the optical fiber communication units are interconnected through optical fibers;
each optical fiber communication unit all disposes optical fiber communication module as communication interface, still disposes:
and the Aurora protocol IP core module is interconnected with the optical fiber communication module.
Optionally, the optical fiber communication module is an SFP + optical fiber communication module.
Optionally, the Aurora protocol IP core module includes:
the user layer is used for calling a data interface for sending and receiving by a user and the time sequence relation of the data interface;
and the data link layer is used for encapsulating the idle sequence, the channel data, the user flow control data, the local flow control data, the initialization sequence and the clock compensation sequence into different types of data packets in the data link layer and transmitting data according to the types of the data packets.
Optionally, the Aurora protocol IP core module further includes:
the PCS layer is used for idle sequence generation, sequencing of link data, CRC check coding and 64B/66B coding of data;
the PMA layer is used for taking charge of data interaction between the PCS layer and the PMD layer;
when the PMA layer receives the PCS layer data, parallel data is serialized into high-speed serial data through a serializer and then sent to the PMD layer; and
when the PMA layer receives the PMD layer data, the data clock recovery circuit recovers a clock signal when the data is sent from the received bit stream data, and the deserializer performs parallel conversion on the serial data according to the recovered clock signal;
and the PMD layer is used as an interface circuit of the optical fiber communication module.
Optionally, the Aurora protocol IP core module uses a stream mode as a user interface.
Optionally, the user interface includes a write port and a read port;
the write port comprises a first output signal and a first input signal, the first output signal is used for indicating whether a transmitting end is ready to receive transmitting data or not, and the first input signal is used for indicating whether the transmitting end is valid or not;
under the condition that the first output signal is set, pulling up the first input signal, and starting to send sending data in the next user clock cycle, if the first output signal is set, keeping the current sending data until the first output signal is set;
the read port includes a second output signal indicating whether the received data is valid;
in the case where the second output signal is deasserted, the currently received data is discarded.
Optionally, each of the optical fiber communication units further includes:
an FIFO module interconnected with the Aurora protocol IP core module,
and calling the Aurora protocol IP core module, converting high-speed serial data into low-speed parallel data streams, and caching the low-speed parallel data streams in the FIFO module.
Optionally, the optical fiber communication unit is integrated in an FPGA development board.
According to the scheme, the invention has the advantages that:
according to the inter-board communication interface system provided by the invention, a plurality of optical fiber communication units are interconnected through optical fibers, and each optical fiber communication unit is provided with an optical fiber communication module as a communication interface and an Aurora protocol IP core module. The system realizes optical fiber communication based on an Aurora protocol, uses optical fibers to carry out high-speed serial data transmission, meets the requirements of high speed, large capacity and the like, enables data to be efficiently and correctly transmitted among the cross-board cards, improves the transmission speed, and realizes long-distance data transmission of hectometer level or even kilometre level; furthermore, the interference of external devices on the superconducting devices in an electromagnetic environment is eliminated.
Drawings
Fig. 1 is a system architecture diagram of an inter-board communication interface system according to an embodiment of the present invention;
FIG. 2 is a block diagram of a protocol layer structure of an Aurora protocol IP core module;
FIG. 3 is a schematic diagram of a data transmission user interface in streaming mode;
FIG. 4 is a timing diagram of a write operation in streaming mode;
FIG. 5 is a timing diagram of a read operation in streaming mode;
wherein:
1-a fiber optic communications unit;
11-a fiber optic communications module;
12-Aurora protocol IP core module;
121-user layer;
122 — data link layer;
123-PCS layer;
124-PMA layer;
125-PMD layer;
13-FIFO module.
Detailed Description
In order to make the aforementioned features and effects of the present invention more comprehensible, embodiments accompanied with figures are described in detail below.
As mentioned above, the field data to be recorded during the debugging of the superconducting device often reaches the high-level data, and the data is required to be transmitted and processed in real time; meanwhile, in an electromagnetic environment, an untimely current flows, so that the RSFQ circuit is easily interfered by external equipment and a connecting device, and the working performance is not stable enough. Based on the above, the embodiment of the present invention provides an inter-board communication interface system, which is based on an interface board card of an FPGA platform to implement an optical fiber communication module, and implements high-speed data transmission by using excellent performances such as high bandwidth and low error rate, and interconnects the board cards through an optical fiber to implement high-speed data transmission between the board cards.
Specifically, referring to fig. 1, fig. 1 is a system structural diagram illustrating a communication interface system between boards according to an embodiment of the present invention.
An inter-board communication interface system comprising: the optical fiber communication units 1 are interconnected through optical fibers;
each optical fiber communication unit 1 is configured with an optical fiber communication module 11 as a communication interface, and is further configured with:
and the Aurora protocol IP core module 12 is interconnected with the optical fiber communication module 11.
In this embodiment, the optical fiber communication units are integrated on the FPGA development board, the plurality of optical fiber communication units are interconnected through optical fibers, each optical fiber communication unit is configured with an optical fiber communication module as a communication interface and an Aurora protocol IP core module, and an optical fiber communication interconnection system is implemented based on an Aurora protocol. The optical fiber is used for high-speed serial data transmission, so that the requirements of high speed, large capacity and the like are met, data can be efficiently and correctly transmitted between the cross-board cards, the stability and reliability of a time sequence are ensured, the transmission speed is improved, the long-distance data transmission of a hectometer level or even a kilometre level is realized, and the transmission bandwidth of a plurality of gigabits is supported; in addition, the optical signal has no current, and the electromagnetic interference to the superconducting RSFQ circuit at low temperature can not be caused.
For the Aurora protocol IP core module, in the specific implementation, the Aurora protocol can be easily implemented on an FPGA through a customized IP core. The GTH transceivers corresponding to the GTH transceivers are integrated in the protocol, the expansion of transmission bandwidth can be realized by connecting a plurality of GTH transceivers, and meanwhile, the GTH transceivers can also be adopted by upper-layer custom protocols or other industry standard protocols. As shown in fig. 2, the Aurora protocol IP core module 12 may be divided into a physical layer, a data link layer, and a user layer, where the physical layer may be further subdivided into a physical medium dependent sublayer PMD, a physical medium connection sublayer PMA, and a physical coding sublayer PCS, and the protocol implements a final conversion of data from optical information to a parallel data stream of a user logic layer.
Specifically, the user layer 121 is configured to invoke a data interface provided for a user to send and receive and a time sequence relationship of the data interface;
and the data link layer 122 is configured to encapsulate the idle sequence, the channel data, the user flow control data, the local flow control data, the initialization sequence, and the clock compensation sequence into different types of data packets at the data link layer, and perform data transmission according to the types of the data packets.
a PMA layer 124 for taking charge of data interaction between the PCS layer and PMD layer;
when the PMA layer receives the data of the PCS layer, the parallel data is serialized into high-speed serial data through a serializer and then sent to the PMD layer; and
when the PMA layer receives the PMD layer data, the data clock recovery circuit recovers a clock signal when the data is sent from the received bit stream data, and the deserializer performs parallel conversion on the serial data according to the recovered clock signal;
and a PMD layer 125 as an interface circuit of the optical fiber communication module.
In addition, because the Aurora protocol IP core can generate a frame mode or stream mode user interface, and the stream mode user interface does not need a special frame delimiter for sending data, the Aurora protocol IP core module in this embodiment adopts the stream mode as the user interface, and the logical data transmission configuration bit Streaming form can ensure the transmission efficiency of the digital signal to the maximum extent, so that the operation is simpler, and the consumed resources are less.
As shown in fig. 3, fig. 3 shows a schematic diagram of a data transmission user interface in streaming mode.
The user interface in the streaming mode includes a write port and a read port, specifically:
the write operation timing is as shown in fig. 4, the write port includes a first output signal s _ axi _ tx _ linear and a first input signal s _ axi _ tx _ tvalid, the first output signal s _ axi _ tx _ linear is used for indicating whether the transmitting end is ready to receive the transmitting data, and the first input signal s _ axi _ tx _ tvalid is used for indicating whether the transmitting data is valid.
Under the condition that the first output signal s _ axi _ tx _ tready is set, the first input signal s _ axi _ tx _ tvalid may be pulled up first, and sending data is started in the next user clock cycle user _ clk to execute a data writing operation s _ axi _ tx _ tdata; if the first output signal s _ axi _ tx _ tready is unset, maintaining the currently transmitted data until the first output signal s _ axi _ tx _ tready is set;
read operation timing as shown in fig. 5, the read port includes a second output signal m _ axi _ rx _ tvalid, which is used to indicate whether the received data is valid. Discarding currently received data in case that the second output signal m _ axi _ rx _ tvalid is set deselected; and performing a read data operation m _ axi _ rx _ tdata with the second output signal m _ axi _ rx _ tvalid set.
In the embodiment, the Aurora 64B/66B protocol IP core is adopted to realize the Aurora protocol, the full-duplex mode is adopted, the stream mode is adopted as a user interface, data transmission is carried out in a stream mode, and 64B/66B data coding is adopted, so that the effective linear rate of channel serial data transmission is 10Gbps, the modular structure and a large number of IP cores reduce the development difficulty.
In addition, aiming at the limitation that the maximum transmission rate of an SFP optical fiber communication interface which is widely applied in the prior art is 4Gbps, the SFP + optical fiber communication module is adopted as an interface communication circuit for high-speed interconnection of equipment, and the maximum rate can reach 10Gbps, so that the data transmission rate is effectively improved, and the interference of external equipment to superconducting equipment in an electromagnetic environment is eliminated. Meanwhile, the SFP + optical fiber communication module transfers circuits for clock and data recovery from a chip to the line cards, and the density of the line cards is improved from 16 XFP blocks to 24 XFP blocks, so that the cost is really reduced.
Further, each of the optical fiber communication units 1 further includes:
a FIFO module 13 interconnected with the Aurora protocol IP core module 12,
and calling the Aurora protocol IP core module 12, converting high-speed serial data into low-speed parallel data streams, and caching the low-speed parallel data streams in the FIFO module 13.
In the embodiment, the FIFO is used as data storage between Aurora IP cores and data cross-clock transmission, and is realized by using the IP cores, so that the development difficulty is greatly reduced.
In summary, in the inter-board communication interface system provided in this embodiment, the plurality of optical fiber communication units are interconnected by optical fibers, each optical fiber communication unit is configured with an optical fiber communication module as a communication interface and an Aurora protocol IP core module, and the optical fiber communication interconnection system is implemented based on an Aurora protocol. The optical fiber is used for high-speed serial data transmission, so that the requirements of high speed, large capacity and the like are met, data can be efficiently and correctly transmitted between the cross-board cards, the transmission speed is improved, and long-distance data transmission of hectometer level or even thousands of levels is realized; furthermore, the interference of external devices on the superconducting devices in an electromagnetic environment is eliminated.
Meanwhile, the optical fiber communication module adopts the SFP + optical fiber communication module, so that a high-speed optical fiber data acquisition and transmission system with the maximum data transmission rate of 10Gbps is realized, 16 channels can be configured at most, the transmission rate of 160Gbps between boards is achieved, the transmission efficiency of mass test data of superconducting equipment is improved, and the interference of external equipment to the superconducting equipment in an electromagnetic environment is eliminated.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a component of' 8230; \8230;" does not exclude the presence of another like element in a process, method, article, or apparatus that comprises the element. Further, it should be noted that the scope of the methods and apparatus of the embodiments of the present application is not limited to performing the functions in the order illustrated or discussed, but may include performing the functions in a substantially simultaneous manner or in a reverse order, depending on the functionality involved.
While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise embodiments described above, which are meant to be illustrative and not restrictive, and that various changes may be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. An inter-board communication interface system, comprising: the optical fiber communication units are interconnected through optical fibers;
each optical fiber communication unit all disposes optical fiber communication module as communication interface, still disposes:
and the Aurora protocol IP core module is interconnected with the optical fiber communication module.
2. The system of claim 1,
the optical fiber communication module adopts an SFP + optical fiber communication module.
3. The system of claim 1, wherein the Aurora protocol IP core module comprises:
the user layer is used for calling a data interface for sending and receiving by a user and the time sequence relation of the data interface;
and the data link layer is used for encapsulating the idle sequence, the channel data, the user flow control data, the local flow control data, the initialization sequence and the clock compensation sequence into different types of data packets in the data link layer and transmitting data according to the types of the data packets.
4. The system of claim 3, wherein the Aurora protocol IP core module further comprises:
the PCS layer is used for idle sequence generation, sequencing of link data, CRC check coding and 64B/66B coding of the data;
the PMA layer is used for taking charge of data interaction between the PCS layer and the PMD layer;
when the PMA layer receives the PCS layer data, parallel data is serialized into high-speed serial data through a serializer and then sent to the PMD layer; and
when the PMA layer receives the PMD layer data, the data clock recovery circuit recovers a clock signal when the data is sent from the received bit stream data, and the deserializer performs parallel conversion on the serial data according to the recovered clock signal;
and the PMD layer is used as an interface circuit of the optical fiber communication module.
5. The system of claim 1,
and the Aurora protocol IP core module adopts a stream mode as a user interface.
6. The system of claim 5,
the user interface comprises a write port and a read port;
the write port comprises a first output signal and a first input signal, the first output signal is used for indicating whether a sending end is ready to receive sending data, and the first input signal is used for indicating whether the sending data is valid;
under the condition that the first output signal is set, pulling up the first input signal, and starting to send sending data in the next user clock cycle, if the first output signal is set, keeping the current sending data until the first output signal is set;
the read port includes a second output signal indicating whether the received data is valid;
in the case where the second output signal is deasserted, the currently received data is discarded.
7. The system of claim 1, wherein each of the fiber optic communication units further comprises:
a FIFO module interconnected with the Aurora protocol IP core module,
and calling the Aurora protocol IP core module, converting high-speed serial data into low-speed parallel data streams, and caching the low-speed parallel data streams in the FIFO module.
8. The system of claim 1,
the optical fiber communication unit is integrated on the FPGA development board.
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Patent Citations (3)
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|---|---|---|---|---|
| CN102681971A (en) * | 2012-04-28 | 2012-09-19 | 浪潮电子信息产业股份有限公司 | Aurora protocol based method for conducting high-speed interconnection between field programmable gate arrays (FPGAs) |
| US20170272184A1 (en) * | 2016-03-17 | 2017-09-21 | Arcom Digital, Llc | Doppler location of signal leaks in an hfc network |
| CN109803128A (en) * | 2019-01-28 | 2019-05-24 | 山东超越数控电子股份有限公司 | A kind of Video Long-distance Transfer System Controled based on FPGA |
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