CN107171762B - A kind of 1PPS+TOD information monobus transmission synchronization system and method - Google Patents
A kind of 1PPS+TOD information monobus transmission synchronization system and method Download PDFInfo
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- CN107171762B CN107171762B CN201710321906.7A CN201710321906A CN107171762B CN 107171762 B CN107171762 B CN 107171762B CN 201710321906 A CN201710321906 A CN 201710321906A CN 107171762 B CN107171762 B CN 107171762B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0602—Systems characterised by the synchronising information used
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0685—Clock or time synchronisation in a node; Intranode synchronisation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L12/40006—Architecture of a communication node
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- Synchronisation In Digital Transmission Systems (AREA)
- Detection And Prevention Of Errors In Transmission (AREA)
Abstract
A kind of 1PPS+TOD information monobus transmission synchronization system and method, it is related to clock field of synchronization, transmitting terminal is arranged per second to local TOD sampling number by the first sampling module, the TOD information of sampling is formed TOD frame by framing module, check field is generated through correction verification module, is serially transmitted to receiving end after coding sending module coding；Receiving end frequency multiplication of phase locked loop module utilizes recovered clock from the second sampling module after TOD serial data stream recovered clock, or is directly sampled by local clock to serial TOD, after frame synchronization module completes frame synchronization, is decoded, frame decoding, frame check；When TOD frame check is correct and without losing, TOD maintenance module updates local TOD with correct TOD；When TOD frame loss or check errors, the TOD being properly received with the last time is certainly plus Δ X completes to synchronize.The present invention transmits 1PPS+TOD information by single bus, saves core bus resource, improves communication stability.
Description
Technical field
The present invention relates to clock field of synchronization, in particular to a kind of 1PPS+TOD information monobus transmits synchronization system
And method.
Background technique
With communication technology continuous development and the continuous improvement of technical indicator, time synchronization is (same containing Frequency Synchronization and phase
Step) function becomes the basic function that must support of network communication equipment.1588 time synchronizations are a kind of high-precision time synchronizations
Agreement, realization process are by the 1PPS (pulse per second (PPS)) for the clock source of source node provided and TOD (Time of Day) with message interaction
Form be transmitted to each from node, realize the time synchronization from node and source node.
And the real-time time between each network element intra-node, business board and master control board card also needs to synchronize.1588
Synchronization core unit is located on master control board card, and master control board card needs local real-time time being transmitted to service board card, so as to business
Board accurately updates 1588 time stamps.It is realized and is communicated by core bus between master control board card and business board.According to conventional scheme,
1PPS+TOD information is transmitted on backboard, need clock, the port PPS and the serial port TOD, at least to occupy 3 core bus.
In core network equipment, it is constitution equipment that core bus, which is used to realize the signal interconnection between each veneer,
Important element.As place capacity is increasing, veneer lumber density is higher and higher, core bus rate, bandwidth and integrated level are not
It is disconnected to improve, but core bus resource is limited, occupancy core bus radical is more, and the stability of communication is poorer.In addition, more backboards
In bus communication, there is the case where interfering with each other between more core bus, for synchronous needs, it is desirable that each core bus is long
It spends identical, if length is different, certain influence can be generated for synchronous transfer.
Summary of the invention
In view of the deficiencies in the prior art, the purpose of the present invention is to provide a kind of 1PPS+TOD information monobus biographies
Synchronization system and method are sent, 1PPS+TOD information is transmitted by single bus, saves core bus resource, communication is improved and stablizes
Property, do not influence synchronous transfer.
To achieve the above objectives, the present invention takes a kind of 1PPS+TOD information monobus transmission synchronization system, including sends
End and receiving end, transmitting terminal and receiving end are connected by a core bus；
The transmitting terminal includes:
First sampling module, for sampling number and sampling to local TOD information to be arranged；
Memory module, the TOD information obtained for storing sampling；
Framing module, for by TOD Information encapsulation in memory module at TOD frame to be sent；TOD frame includes frame head, frame
Serial number, type, length, TOD data payload, check field and the null symbol for filling two TOD frame gaps；
Correction verification module, for calculating the check field of TOD frame to be sent；
Sending module is encoded, for encoding to TOD frame to be sent, the clock that the TOD frame after coding carries transmitting terminal rises
Along information, it is also used to the TOD frame after coding being sent to receiving end；
The receiving end includes:
Frequency multiplication of phase locked loop module, for recovering clock information from the TOD frame encoded data stream received；
Second sampling module, for finding the intermediate time of the symbol of TOD coded bit stream in the clock domain recovered
And it samples；
Whether frame synchronization module completes frame synchronization for finding the specific pattern of frame head, and will have frame loss information to send to
TOD maintenance module；
Decoder module, for being decoded into TOD frame to received TOD serial data information；
It solves frame module and sends correction verification module to for decoded TOD frame to be decomposed into each field；
Correction verification module, for verification and by way of verify TOD frame, and send check results to TOD maintenance module；
TOD maintenance module when not losing for TOD frame and verify correct, updates receiving end using the current TOD that receives
TOD, in each clock cycle, local TOD adds a TOD maintenance clock cycle Δ X completion receiving end TOD in real time and transmitting terminal certainly
TOD is synchronous；Or for adding one certainly using the TOD frame that the last time is properly received in TOD frame loss or TOD check errors
It is synchronous that a TOD maintenance clock cycle Δ X completes real-time TOD.
Based on the above technical solution, first sampling module is with the clock of 125M according to 1 second 10000 times frequencies
Rate samples local TOD information, and the second sampling module is identical as the first sampling module sampling period.
Based on the above technical solution, the coding sending module uses the bit information flow tune of TOD frame to be sent
The failing edge phase of tranmitting data register processed, rising edge phase remain unchanged, and modulated serial TOD information is the volume of 25Mbits/s
The rate of code chip, the effective information rate carried after modulation are 6.25Mbits/s.
Based on the above technical solution, the transmitting terminal local TOD information is 125M clock domain, is believed comprising 80 bits
Breath, 48 bit seconds values, 32 bit nanosecond value, TOD nanosecond value be 0 when be PPS pulse position；The receiving end is from phaselocked loop times
The clock that frequency recovers is 125M, which is used as the sampling clock for receiving TOD and TOD maintenance clock, i.e. a TOD dimension simultaneously
It protects clock cycle Δ X and is equal to the TOD sampling reception clock cycle, be 8ns.
The present invention also provides a kind of 1PPS+TOD information monobus to transmit synchronous method, comprising: transmitting terminal is adopted by first
The sampling number per second to local TOD information is arranged in egf block, and samples storage, into memory module, framing module uses verification
The check field of module calculating carries out a framing to the TOD information acquired every time, then by coding sending module to be sent
TOD frame sends receiving end to after carrying out serial code；The frequency multiplication of phase locked loop module of receiving end is from the TOD encoded data stream received
Clock information is recovered, intermediate time and the sampling of symbol are found by the second sampling module, frame synchronization module is by finding frame
Head information carries out frame synchronization, judges whether there is frame loss；Then the TOD frame for finding frame originating point information is obtained by decoding and frame decoding
Each field, by verification and in a manner of check field in TOD frame is verified；When TOD frame check is correct and without losing,
TOD maintenance module updates local TOD using correct TOD, adds a TOD to safeguard clock cycle Δ X certainly in each clock cycle
It is synchronous with transmitting terminal TOD in real time to complete TOD；When for TOD frame loss or check errors, TOD maintenance module utilizes the last time
The TOD frame being properly received is synchronous from adding a TOD maintenance clock cycle Δ X to complete real-time TOD.
Based on the above technical solution, frame synchronization module finds the specific of frame head in a manner of sliding transfer register
Pattern completes frame synchronization, and the sampling between two TOD frames of time interval and transmitting terminal by monitoring two TOD frame frame heads is sent
Whether time interval is equal to judge whether there is frame loss.
Based on the above technical solution, the encoding scheme of the coding TOD frame is to indicate information ratio with symbol 1000
Spy 1, indicates information bit 0 with symbol 1110, and the free message of two frame gaps of filling is indicated with symbol 1100；The special code of frame head
Type is 01110110.
Based on the above technical solution, the local clock domain of transmitting terminal TOD sampling is 125M, the TOD frame after framing
Using the rate of 25Mbits/s code chip, i.e., the practical effective information data stream with 6.25Mbits/s is to receiving end；
The clock domain that receiving end frequency multiplication of phase locked loop restores is 125M, when which is used as the sampling clock for receiving TOD and TOD maintenance simultaneously
Clock, i.e. a TOD maintenance clock cycle Δ X are equal to TOD sampling and receive the clock cycle, are 8ns.
Based on the above technical solution, the TOD maintenance module carry out second part update comprising steps of
B101. judge whether that the arrival of TOD frame head, TOD frame are correct without losing and verifying, if so, into B102；If it is not, into
Enter B 105；
B102. judge receive nanosecond whether be more than or equal to 109Δ T, wherein Δ T is the time between two TOD transmission frames
Interval, if so, into B103；If it is not, into B 104；
B103. local second=reception second+1, terminate；
B104. local second=reception second, terminate；
B105. judge whether local nsec portion is more than or equal to 109Δ X, if so, into B106；If it is not, into B107；
B106. local second=local second+1, terminate；
B107. local second=local second, terminate.
Based on the above technical solution, the TOD maintenance module carry out nsec portion update comprising steps of
A101. judge whether that the arrival of TOD frame head, TOD frame are correct without losing and verifying, if so, into A 102；If it is not, into
Enter A 105；
A 102. judges receive nanosecond whether be more than or equal to 109Δ T, wherein Δ T be two TOD send between frames when
Between be spaced, if so, into A 103；If it is not, into A 104；
103. local nanosecond=reception nanosecond+Δ T-10 of A9, terminate；
104. local nanosecond=reception nanosecond+Δ T of A terminates；
A 105. judges whether local nsec portion is more than or equal to 109Δ X, wherein Δ X is the period that TOD safeguards clock,
If so, into A106；If it is not, into A107；
106. local nanosecond=local nanosecond+Δ X-10 of A9, terminate；
107. local nanosecond=local nanosecond+Δ X of A terminates.
The present invention also provides a kind of 1PPS+TOD information monobus to transmit synchronization system, including transmitting terminal and receiving end, hair
Sending end is connected with receiving end by a core bus；
The transmitting terminal includes:
First sampling module, for sampling number and sampling to local TOD information to be arranged；
Memory module, the TOD information obtained for storing sampling；
Framing module, for by TOD Information encapsulation in memory module at TOD frame to be sent；TOD frame includes frame head, frame
Serial number, type, length, TOD data payload, check field and the null symbol for filling two TOD frame gaps；
Correction verification module, for calculating the check field of TOD frame to be sent；
Sending module is encoded, for encoding to TOD frame to be sent, the clock that the TOD frame after coding carries transmitting terminal rises
Along information, it is also used to the TOD frame after coding being sent to receiving end；
The receiving end includes:
Second sampling module, for finding the symbol of TOD coded bit stream in the local clock domain that receiving end provides
Intermediate time simultaneously samples；
Whether frame synchronization module completes frame synchronization for finding the specific pattern of frame head, and will have frame loss information to send to
TOD maintenance module；
Decoder module, for being decoded into TOD frame to received TOD serial data information；
It solves frame module and sends correction verification module to for decoded TOD frame to be decomposed into each field；
Correction verification module, for verification and by way of verify TOD frame, and send check results to TOD maintenance module；
TOD maintenance module when not losing for TOD frame and verify correct, updates receiving end using the current TOD that receives
TOD, in each clock cycle, local TOD adds a TOD maintenance clock cycle Δ X completion receiving end TOD in real time and transmitting terminal certainly
TOD is synchronous；Or for adding one certainly using the TOD frame that the last time is properly received in TOD frame loss or TOD check errors
It is synchronous that a TOD maintenance clock cycle Δ X completes real-time TOD.
Based on the above technical solution, first sampling module is with the clock of 125M according to 1 second 10000 times frequencies
Rate samples local TOD information, and the second sampling module is identical as the first sampling module sampling period.
Based on the above technical solution, the coding sending module uses the bit information flow tune of TOD frame to be sent
The failing edge phase of tranmitting data register processed, rising edge phase remain unchanged, and modulated serial TOD information is the volume of 25Mbits/s
The rate of code chip, the effective information rate carried after modulation are 6.25Mbits/s.
Based on the above technical solution, TOD intelligence sample clock in transmitting terminal local is 125M clock domain, includes 80 ratios
Special information, 48 bit seconds values, 32 bit nanosecond value, TOD nanosecond value be 0 when be PPS pulse position；What receiving end provided
Reception TOD sampling clock be 125M clock domain, the clock simultaneously be used as receive TOD sampling clock and TOD maintenance clock, i.e., one
A TOD maintenance clock cycle Δ X is equal to TOD sampling and receives the clock cycle, is 8ns.
The present invention also provides a kind of PPS+TOD information monobus to transmit synchronous method, comprising: transmitting terminal passes through the first sampling
The sampling number per second to local TOD information is arranged in module, and samples storage, into memory module, framing module uses calibration mode
The check field of block calculating carries out a framing to the TOD information acquired every time, then by coding sending module to TOD to be sent
Frame sends receiving end to after carrying out serial code；Second sampling module of receiving end in the local clock domain that receiving end provides,
The intermediate time of the symbol of TOD coded bit stream and sampling are found, frame synchronization module carries out frame synchronization by finding frame originating point information,
Judge whether there is frame loss；Then the TOD frame for finding frame originating point information is decoded and frame decoding, each field solved, with school
The mode for testing sum verifies check field in TOD frame；When TOD frame check is correct and without losing, TOD maintenance module is utilized
Correct TOD updates local TOD, synchronous from adding a TOD maintenance clock cycle Δ X to complete real-time TOD in each clock cycle；
When for TOD frame loss or check errors, the TOD frame that TOD maintenance module is properly received using the last time is certainly plus a TOD is tieed up
It is synchronous to protect the real-time TOD of clock cycle Δ X completion.
Based on the above technical solution, frame synchronization module finds the specific of frame head in a manner of sliding transfer register
Pattern completes frame synchronization, and the sampling between two TOD frames of time interval and transmitting terminal by monitoring two TOD frame frame heads is sent
Whether time interval is equal to judge whether there is frame loss.
Based on the above technical solution, the encoding scheme of the coding TOD frame is to indicate information ratio with symbol 1000
Spy 1, indicates information bit 0 with symbol 1110, and the free message of two frame gaps of filling is indicated with symbol 1100；The special code of frame head
Type is 01110110.
Based on the above technical solution, transmitting terminal local clock domain is 125M, and the TOD frame after framing uses
25Mbits/s code chip rate, i.e., the practical effective information data stream with 6.25Mbits/s is to receiving end；Receiving end
TOD locally sampling receive clock be 125M, the clock simultaneously be used as receive TOD sampling clock and TOD maintenance clock, i.e., one
TOD safeguards that clock cycle Δ X is equal to TOD sampling and receives the clock cycle, is 8ns.
Based on the above technical solution, the local 125M clock of transmitting terminal and the local 125M clock of receiving end are phase
The frequency deviation of mutual independent clock domain, the two 125M clock domains controls within 100ppm, and the TOD that receiving end recovers at this time is real
When the time and transmitting terminal TOD real-time time precision within ± 10ns.
The beneficial effects of the present invention are:
Transmitting terminal carries out serial code to TOD frame by coding sending module, and coding sending module uses TOD frame to be sent
Bit information flow modulation tranmitting data register failing edge phase, rising edge phase remains unchanged, and it is encoded after TOD frame carry
Clock originator rising edge information；Therefore the transmission of 1PPS+TOD information can be realized by a bus, maximize and save backboard
Bus resource, relative to the scheme of more parallel bus, communication process is more reliable and more stable.
Receiving end is decoded the TOD frame received using frequency multiplication of phase locked loop or using by the way of the TOD information of local
And verify, guarantee the transmission of TOD frame synchronization, improves synchronous accuracy.
Detailed description of the invention
Fig. 1 is the transmitting terminal schematic diagram that 1PPS+TOD of embodiment of the present invention information monobus transmits synchronization system；
Fig. 2 is the receiving end schematic diagram that first embodiment of the invention 1PPS+TOD information monobus transmits synchronization system；
Fig. 3 is the receiving end schematic diagram that second embodiment of the invention 1PPS+TOD information monobus transmits synchronization system；
Fig. 4 is that TOD maintenance module of the present invention carries out second part update flow chart；
Fig. 5 is that TOD maintenance module of the present invention carries out nsec portion update flow chart.
Appended drawing reference:
Transmitting terminal 1, the first sampling module 11, memory module 12, framing module 13, correction verification module 14 encode sending module
15；
Receiving end (2,2 '), frequency multiplication of phase locked loop module 20, the second sampling module 21, frame synchronization module 22, decoder module 23,
Solve frame module 24, correction verification module 25, TOD maintenance module 26.
Specific embodiment
Invention is further described in detail with reference to the accompanying drawings and embodiments.
First embodiment
As depicted in figs. 1 and 2, the present embodiment 1PPS+TOD information monobus transmits synchronization system, including transmitting terminal 1 and connects
Receiving end 2, transmitting terminal 1 and receiving end 2 are connected by a core bus.
As shown in Figure 1, transmitting terminal 1 includes the first sampling module 11, memory module 12, framing module 13, correction verification module 14
With coding sending module 15.First sampling module 11 is used to be arranged that (how much is transmission i.e. per second to the sampling number of local TOD information
Frame) and sample, first applies in example, and the first sampling module 11 is local according to 1 second 10000 times frequency samplings with the clock of 125M
TOD information, the local TOD information of transmitting terminal 1 are 125M clock domain, include 80 bit informations, 48 bit seconds values, 32 bit nanoseconds
Value, TOD nanosecond value are the position of PPS pulse when being 0.Memory module 12 is used for the TOD obtained with register form storage sampling
Information.Framing module 13 is used for TOD Information encapsulation in memory module 12 into TOD frame to be sent, and TOD frame includes frame head, frame
Serial number, type, length, TOD data payload, check field and the null symbol for filling two TOD frame gaps.Correction verification module 14
For calculating the check field of TOD frame to be sent.It encodes sending module 15 to be used to encode TOD frame to be sent, use is to be sent
The bit information of TOD frame flows away the failing edge phase of modulation tranmitting data register, and rising edge phase remains unchanged, and is equivalent to a kind of arteries and veins
Rush width modulated.Encode the encoding scheme of TOD frame are as follows: indicate information bit 1 with symbol " 1000 ", indicate to believe with symbol " 1110 "
Bit 0 is ceased, the free message of two frame gaps of filling is indicated with symbol " 1100 "；Frame head includes specific pattern, spy in the present embodiment
Determining pattern is " 01110110 ".After coding, the position for being equivalent to the failing edge of transmitting terminal clock carries TOD data information,
And rising edge carry be transmitting terminal rising edge clock information.In the present embodiment, the local clock domain of TOD sampling is 125M,
The clock is used as the sampling clock for receiving TOD and TOD maintenance clock simultaneously, i.e. a TOD maintenance clock cycle Δ X is equal to TOD
Sampling receives the clock cycle, is 8ns.The transmission rate of the TOD frame obtained after sampling framing is using 25Mbits/s (by local
125M divides to obtain) rate of code chip, i.e., the practical effective information data stream with 6.25Mbits/s to receiving end,
The rising edge phase of the 6.25Mbits/s bit stream is fixed.Here 25Mbits/s, 6.25Mbits/s and originator are local
125M clock is homologous, so the rising edge of 6.25Mbits/s also reflects the rising edge of 125M clock.
As shown in Fig. 2, receiving end 2 includes frequency multiplication of phase locked loop module 20, the second sampling module 21, frame synchronization module 22, solution
Code module 23, solution frame module 24, correction verification module 25 and TOD maintenance module 26.Frequency multiplication of phase locked loop module 20 is used for from receiving
The clock information of 125M is recovered in TOD frame data stream.Second sampling module 21 is used in the clock domain recovered, is found
The intermediate time of the symbol of the serial TOD coded bit stream of 25M and sampling.Frame synchronization module 22 is complete for finding the specific pattern of frame head
Framing synchronization, and pass through the sampling sending time between two TOD frames of time interval and transmitting terminal of two TOD frame frame heads of monitoring
Whether whether interval is equal judges whether there is frame loss, will have frame loss information to be sent to TOD maintenance module 26.Decoder module 23
For received TOD serial data information to be decoded into TOD frame according to the coding rule of transmitting terminal Coding and description.Solve frame module 24
For decoded TOD frame to be decomposed into each field, and send correction verification module 25 to.Correction verification module 25 by verify and in a manner of
It verifies TOD frame and abandons the frame if check errors；Correction verification module 25 also needs for check results to be sent to TOD maintenance module
26.TOD maintenance module 26 is used for when TOD frame is not lost and verifies correct, updates local TOD, and benefit using the current TOD that receives
With correct TOD information is verified, a TOD is added to safeguard clock cycle Δ X, (Δ X=1s/ certainly in each 125M clock cycle
It 125MHz=8ns) completes receiving end TOD to safeguard with transmitting terminal TOD in real time, realizes that receiving end TOD's and transmitting terminal TOD is real-time same
Step；TOD maintenance module 26 is also used in TOD frame loss or TOD check errors, the TOD frame being properly received using the last time
From adding one TOD maintenance clock cycle Δ X of interval time to be safeguarded, the real-time same of receiving end TOD and transmitting terminal TOD is completed
Step.When the TOD nsec portion of local maintenance is 0, PPS pulse is recovered from TOD, and the pulse width of PPS can be moved
State configuration.
First embodiment 1PPS+TOD information monobus transmits synchronous method, includes the following steps:
The sampling number per second to local TOD information is arranged by the first sampling module 11 in transmitting terminal 1, and samples storage arrives
In memory module 12, the check field that correction verification module 14 calculates, framing module 13 believes the TOD acquired every time using check field
Breath carries out a framing, and TOD frame includes frame head, frame number, type, length, TOD data payload, check field and for filling
The null symbol of two TOD frame gaps.After finally carrying out serial code to TOD frame to be sent by coding sending module 15, send to
Receiving end 2.
2 frequency multiplication of phase locked loop module 20 of receiving end always recovers clock information from the TOD frame data stream of transmitting terminal 1, tool
Body, using phaselocked loop (FPGA has included phaselocked loop) is received, the serial TOD of 25M of transmitting terminal rising edge clock information will be carried
Frame encoding code stream frequency multiplication to 125M, what the phase relation of 125M clock that frequency multiplication obtains and originator 125M clock was locked out.Then
Through the second sampling module 21 under the control of counter, optimum sampling point (the i.e. code of the serial TOD coded bit stream of 25M is found
The intermediate time of member) and sample.Frame originating point information is found (containing frame in a manner of sliding transfer register by frame synchronization module 22 again
Specific pattern) frame synchronization is carried out, and pass through the sampling between two TOD frames of time interval and transmitting terminal of two frame frame heads of monitoring
Whether transmission time interval is equal to judge whether there is frame loss, and by the result notice to TOD maintenance module 26.Then pass through solution
Code module 23 is decoded the TOD frame for finding frame originating point information, and decoding rule is identical as the coding rule of transmitting terminal 1.Pass through again
It solves frame module 24 and decoded TOD data frame is decomposed into each field, and send correction verification module 25 to.Again by correction verification module 25
By verification and in a manner of check field in TOD frame is verified, and check results are sent to TOD maintenance module 26；Verification
If when 25 check errors of module, abandoning the TOD frame.When TOD frame check is correct and without losing, TOD maintenance module 26 is utilized
Correct TOD updates local TOD, adds a TOD maintenance clock cycle Δ X (to be equal to TOD sampling reception certainly in each clock cycle
Clock cycle, the present embodiment Δ X=8ns) complete real-time TOD and transmitting terminal TOD synchronized；For TOD frame loss or verification
When mistake, the TOD frame that TOD maintenance module 26 is properly received using the last time is certainly plus a TOD maintenance clock cycle Δ X is completed
TOD is synchronous with transmitting terminal TOD in real time.
Fig. 4 is that TOD maintenance module of the present invention carries out second part more new technological process, is specifically comprised the following steps:
B101. judge whether that the arrival of TOD frame head, TOD frame are correct without losing and verifying, if so, into B102；If it is not, into
Enter B 105；
B102. judge receive nanosecond whether be more than or equal to 109Δ T, wherein Δ T is the time between two TOD transmission frames
Interval, if so, into B103；If it is not, into B 104；
B103. local second=reception second+1 replaces part of local second using the result for receiving second part+1, completes maintenance
The carry of second part, wherein Δ T is the time interval between two TOD transmission frames, and the design was completed due to transmitting terminal every 1 second
10000 real-time TOD samplings and framing are sent, so △ T=0.1ms, terminates；
B104. local second=reception second, i.e. reception second part directly replace local second part to realize second partial maintenance, knot
Beam；
B105. judge whether local nsec portion is more than or equal to 109-ΔX；If so, into B106；If it is not, into B107；
B106. local second=local second+1 realizes that local second part from maintenance carry, terminates；
B107. local second=local second keeps local second part to remain unchanged, terminates.
Fig. 5 is that TOD maintenance module of the present invention carries out nsec portion more new technological process, specifically includes step:
A101. judge whether that the arrival of TOD frame head, TOD frame are correct without losing and verifying, if so, into A 102；If it is not, into
Enter A 105；
A 102. judges receive nanosecond whether be more than or equal to 109Δ T, wherein Δ T be two TOD send between frames when
Between be spaced, if so, into A103；If it is not, into A104；
103. local nanosecond=reception nanosecond+Δ T-10 of A9, receive nsec portion+Δ T-109Result replace local receive
Second is partially completed maintenance, and wherein Δ T is the time interval between two TOD transmission frames, terminates；
104. local nanosecond=reception nanosecond+Δ T of A receives nanosecond portion+Δ T and local nsec portion is replaced to complete maintenance,
Terminate；
A 105. judges whether local nsec portion is more than or equal to 109Δ X, wherein Δ X is that a TOD safeguards clock week
Phase (is equal to TOD sampling and receives the clock cycle, be 8ns in the present embodiment), if so, into A 106；If it is not, into A 107；
106. local nanosecond=local nanosecond+Δ X-10 of A9, realize local nsec portion from maintenance carry and clearing, knot
Beam；
Local nanosecond=local the nanosecond of A 107.+Δ X, local nsec portion is realized from the maintenance for adding Δ X, is terminated.
Second embodiment
As shown in figures 1 and 3, the present embodiment 1PPS+TOD information monobus transmits synchronization system, including transmitting terminal 1 and connects
Receiving end 2, transmitting terminal 1 and receiving end 2 are connected by a core bus.In the system of the present embodiment, transmitting terminal and first is implemented
Example transmitting terminal 1 is structurally and functionally identical.As shown in Fig. 2, receiving end 2 ' is similar with first embodiment receiving end 2, difference is, this
The receiving end 2 ' of embodiment does not include frequency multiplication of phase locked loop module 20, including the second sampling module 21, and frame synchronization module 22 decodes mould
Block 23 solves frame module 24, correction verification module 25, TOD maintenance module 26.In the present embodiment, the second sampling module is used in receiving end
In the 2 ' local clock domains provided, the intermediate time of the symbol of TOD coded bit stream and sampling are found；Its complementary modul of receiving end 2 '
The structure and purposes of block are identical with the first embodiment, and the simplification for design considers that second embodiment can directly adopt local
125M clock complete TOD sampling receive；But more accurate system is required for time synchronization, receiving end preferably uses the first reality
Apply example, that is to say, that first embodiment is higher than the accuracy of second embodiment.
The present embodiment 1PPS+TOD information monobus transmits synchronous method, comprising steps of
The sampling number per second to local TOD information is arranged by the first sampling module 11 in transmitting terminal 1, and samples storage arrives
In memory module 12, the check field that correction verification module 14 calculates, framing module 13 believes the TOD acquired every time using check field
Breath carries out a framing, and TOD frame includes frame head, frame number, type, length, TOD data payload, check field and for filling
The null symbol of two TOD frame gaps.After finally carrying out serial code to TOD frame to be sent by coding sending module 15, send to
Receiving end 22 '.
Second sampling module 21 of receiving end 2 ' finds TOD coded bit stream in the local clock domain that receiving end provides
Symbol intermediate time and sampling, then find frame originating point information in a manner of sliding transfer register by frame synchronization module 22 and (contain
Have the specific pattern of frame head) frame synchronization is carried out, and by between two TOD frames of time interval and transmitting terminal of two frame frame heads of monitoring
Whether transmission time interval is equal judges whether there is frame loss for sampling, and by the result notice to TOD maintenance module 26.Then lead to
It crosses decoder module 23 to be decoded the TOD frame for finding frame originating point information, decoding rule is identical as the coding rule of transmitting terminal 1.Again
TOD data frame after decoding is decomposed into after each field by solution frame module 24 and is sent to correction verification module 25.Again by correction verification module
25 by verification and in a manner of check field in TOD frame is verified, and check results are sent to TOD maintenance module 26；School
If testing 25 check errors of module, the TOD frame is abandoned.When TOD frame check is correct and without losing, TOD maintenance module 26 is utilized
Correct TOD updates local TOD, adds a TOD maintenance clock cycle Δ X (to be equal to TOD sampling reception certainly in each clock cycle
Clock cycle is 8ns in the present embodiment) to complete real-time TOD synchronous；When for TOD frame loss or check errors, TOD safeguards mould
The TOD frame that block 26 is properly received using the last time is synchronous from adding a TOD maintenance clock cycle Δ X to complete real-time TOD.
In the present embodiment method, transmitting terminal local clock domain is 125M, and the TOD frame after framing is encoded using 25Mbits/s
Spreading rate, i.e., the practical effective information data stream with 6.25Mbits/s is to receiving end.The present embodiment and first embodiment
It is received the difference is that TOD sampling is directly completed using the 125M clock of 21 pairs of locals of the second sampling module in receiving end 2 '；
The clock is used as the sampling clock for receiving TOD and TOD maintenance clock simultaneously, i.e. a TOD maintenance clock cycle Δ X is equal to TOD
Sampling receives the clock cycle, is 8ns.The local 125M clock of transmitting terminal and the local 125M clock of receiving end are mutually indepedent
Clock domain, the frequency deviations of the two 125M clock domains needs to control within 100ppm, and the TOD that receiving end recovers at this time is real-time
The precision of time and transmitting terminal TOD real-time time can control within ± 10ns.The present embodiment in TOD maintenance module 26,
It carries out second part update and nsec portion update is identical with the first embodiment, details are not described herein again.
The present invention is not limited to the above-described embodiments, for those skilled in the art, is not departing from
Under the premise of the principle of the invention, several improvements and modifications can also be made, these improvements and modifications are also considered as protection of the invention
Within the scope of.The content being not described in detail in this specification belongs to the prior art well known to professional and technical personnel in the field.
Claims (13)
1. a kind of 1PPS+TOD information monobus transmits synchronization system, including transmitting terminal and receiving end, which is characterized in that transmitting terminal
It is connected with receiving end by a core bus；
The transmitting terminal includes:
First sampling module, for sampling number and sampling to local TOD information to be arranged；
Memory module, the TOD information obtained for storing sampling；
Framing module, for by TOD Information encapsulation in memory module at TOD frame to be sent；TOD frame include frame head, frame number,
Type, length, TOD data payload, check field and the null symbol for filling two TOD frame gaps；
Correction verification module, for calculating the check field of TOD frame to be sent；
Sending module is encoded, for encoding to TOD frame to be sent, the TOD frame after coding carries the rising edge clock letter of transmitting terminal
Breath is also used to the TOD frame after coding being sent to receiving end；
The receiving end includes:
Frequency multiplication of phase locked loop module, for recovering clock information from the TOD frame encoded data stream received；
Second sampling module, in the clock domain recovered, finding the intermediate time of the symbol of TOD coded bit stream and adopting
Sample；
Whether frame synchronization module completes frame synchronization for finding the specific pattern of frame head, and will have frame loss information to send TOD dimension to
Protect module；
Decoder module, for being decoded into TOD frame to received TOD serial data information；
It solves frame module and sends correction verification module to for decoded TOD frame to be decomposed into each field；
Correction verification module, for verification and by way of verify TOD frame, and send check results to TOD maintenance module；
TOD maintenance module when not losing for TOD frame and verify correct, updates receiving end TOD using the current TOD that receives,
In each clock cycle, local TOD from plus TOD maintenance clock cycle Δ X complete receiving end TOD in real time with transmitting terminal TOD
It is synchronous；Or for adding one certainly using the TOD frame that the last time is properly received in TOD frame loss or TOD check errors
It is synchronous that TOD safeguards that clock cycle Δ X completes real-time TOD；
With the clock of 125M according to 1 second 10000 times frequency sampling local TOD information, second samples first sampling module
Module is identical as the first sampling module sampling period；
The coding sending module is risen using the failing edge phase of the bit information flow modulation tranmitting data register of TOD frame to be sent
It is remained unchanged along phase, modulated serial TOD information is the rate of the code chip of 25Mbits/s, and what is carried after modulation has
Effect information rate is 6.25Mbits/s；
The encoding scheme of the coding TOD frame is to indicate information bit 1 with symbol 1000, indicates information bit with symbol 1110
0, the free message of two frame gaps of filling is indicated with symbol 1100；The specific pattern of frame head is 01110110.
2. 1PPS+TOD information monobus as described in claim 1 transmits synchronization system, it is characterised in that: the transmitting terminal sheet
Ground TOD information be 125M clock domain, include 80 bit informations, 48 bit seconds values, 32 bit nanosecond value, TOD nanosecond value be 0 when be
The position of PPS pulse；The clock that the receiving end is recovered from frequency multiplication of phase locked loop is 125M, which is used as simultaneously receives TOD
Sampling clock and TOD safeguard that clock, i.e. TOD maintenance clock cycle Δ X are equal to TOD sampling and receive the clock cycle, be
8ns。
3. a kind of 1PPS+TOD information monobus based on claim 1 system transmits synchronous method characterized by comprising
The sampling number per second to local TOD information is arranged by the first sampling module in transmitting terminal, and samples storage is to storage mould
In block, check field that framing module is calculated using correction verification module carries out a framing to the TOD information acquired every time, then by
Coding sending module sends receiving end to after carrying out serial code to TOD frame to be sent；
The frequency multiplication of phase locked loop module of receiving end recovers clock information from the TOD encoded data stream received, passes through the second sampling
Module finds the intermediate time of symbol and sampling, and frame synchronization module carries out frame synchronization by finding frame originating point information, judges whether there is
Frame loss；Then by the TOD frame for finding frame originating point information by decoding and frame decoding obtain each field, by verification and in a manner of pair
Check field is verified in TOD frame；When TOD frame check is correct and without losing, TOD maintenance module utilizes correct TOD more
New local TOD, it is synchronous with transmitting terminal TOD in real time from adding a TOD maintenance clock cycle Δ X to complete TOD in each clock cycle；
When for TOD frame loss or check errors, the TOD frame that TOD maintenance module is properly received using the last time is certainly plus a TOD is tieed up
It is synchronous to protect the real-time TOD of clock cycle Δ X completion.
4. 1PPS+TOD information monobus as claimed in claim 3 transmits synchronous method, it is characterised in that: frame synchronization module with
The specific pattern that the mode of sliding transfer register finds frame head completes frame synchronization, by the time for monitoring two TOD frame frame heads
Interval with whether the sampling transmission time interval between two TOD frames of transmitting terminal equal judges whether there is frame loss.
5. 1PPS+TOD information monobus as claimed in claim 3 transmits synchronous method, it is characterised in that: transmitting terminal TOD is adopted
The local clock domain of sample is 125M, and the TOD frame after framing uses the rate of 25Mbits/s code chip, i.e., it is practical with
The effective information data stream of 6.25Mbits/s is to receiving end；The clock domain that receiving end frequency multiplication of phase locked loop restores is 125M, should
Clock is used as the sampling clock for receiving TOD and TOD maintenance clock simultaneously, i.e. a TOD maintenance clock cycle Δ X is adopted equal to TOD
Sample receives the clock cycle, is 8ns.
6. the 1PPS+TOD information monobus based on phase-modulation transmits synchronous method as claimed in claim 3, which is characterized in that
The TOD maintenance module carry out second part update comprising steps of
B101. judge whether that the arrival of TOD frame head, TOD frame are correct without losing and verifying, if so, into B102；If it is not, into B
105；
B102. judge receive nanosecond whether be more than or equal to 109Δ T, wherein Δ T is the time interval between two TOD transmission frames,
If so, into B103；If it is not, into B 104；
B103. local second=reception second+1, terminate；
B104. local second=reception second, terminate；
B105. judge whether local nsec portion is more than or equal to 109Δ X, if so, into B106；If it is not, into B107；
B106. local second=local second+1, terminate；
B107. local second=local second, terminate.
7. the 1PPS+TOD information monobus based on phase-modulation transmits synchronous method as claimed in claim 3, which is characterized in that
The TOD maintenance module carry out nsec portion update comprising steps of
A101. judge whether that the arrival of TOD frame head, TOD frame are correct without losing and verifying, if so, into A 102；If it is not, into A
105；
A 102. judges receive nanosecond whether be more than or equal to 109Δ T, wherein between time of the Δ T between two TOD transmission frames
Every if so, into A 103；If it is not, into A104；
A103. local nanosecond=reception nanosecond+Δ T-109, terminate；
A104. local nanosecond=reception nanosecond+Δ T terminates；
A105. judge whether local nsec portion is more than or equal to 109Δ X, wherein Δ X is the period that TOD safeguards clock, if so,
Into A106；If it is not, into A107；
A106. local nanosecond=local nanosecond+Δ X-109, terminate；
107. local nanosecond=local nanosecond+Δ X of A terminates.
8. a kind of 1PPS+TOD information monobus transmits synchronization system, including transmitting terminal and receiving end, which is characterized in that transmitting terminal
It is connected with receiving end by a core bus；
The transmitting terminal includes:
First sampling module, for sampling number and sampling to local TOD information to be arranged；
Memory module, the TOD information obtained for storing sampling；
Framing module, for by TOD Information encapsulation in memory module at TOD frame to be sent；TOD frame include frame head, frame number,
Type, length, TOD data payload, check field and the null symbol for filling two TOD frame gaps；
Correction verification module, for calculating the check field of TOD frame to be sent；
Sending module is encoded, for encoding to TOD frame to be sent, the TOD frame after coding carries the rising edge clock letter of transmitting terminal
Breath is also used to the TOD frame after coding being sent to receiving end；
The receiving end includes:
Second sampling module, for finding the centre of the symbol of TOD coded bit stream in the local clock domain that receiving end provides
Moment simultaneously samples；
Whether frame synchronization module completes frame synchronization for finding the specific pattern of frame head, and will have frame loss information to send TOD dimension to
Protect module；
Decoder module, for being decoded into TOD frame to received TOD serial data information；
It solves frame module and sends correction verification module to for decoded TOD frame to be decomposed into each field；
Correction verification module, for verification and by way of verify TOD frame, and send check results to TOD maintenance module；
TOD maintenance module when not losing for TOD frame and verify correct, updates receiving end TOD using the current TOD that receives,
In each clock cycle, local TOD from plus TOD maintenance clock cycle Δ X complete receiving end TOD in real time with transmitting terminal TOD
It is synchronous；Or for adding one certainly using the TOD frame that the last time is properly received in TOD frame loss or TOD check errors
It is synchronous that TOD safeguards that clock cycle Δ X completes real-time TOD；
With the clock of 125M according to 1 second 10000 times frequency sampling local TOD information, second samples first sampling module
Module is identical as the first sampling module sampling period；
The coding sending module is risen using the failing edge phase of the bit information flow modulation tranmitting data register of TOD frame to be sent
It is remained unchanged along phase, modulated serial TOD information is the rate of the code chip of 25Mbits/s, and what is carried after modulation has
Effect information rate is 6.25Mbits/s；
The encoding scheme of the coding TOD frame is to indicate information bit 1 with symbol 1000, indicates information bit with symbol 1110
0, the free message of two frame gaps of filling is indicated with symbol 1100；The specific pattern of frame head is 01110110.
9. 1PPS+TOD information monobus as claimed in claim 8 transmits synchronization system, it is characterised in that: transmitting terminal is local
TOD intelligence sample clock be 125M clock domain, include 80 bit informations, 48 bit seconds values, 32 bit nanosecond value, TOD nanosecond value
It is the position of PPS pulse when being 0；The reception TOD sampling clock that receiving end provides is 125M clock domain, which uses simultaneously
Make the sampling clock for receiving TOD and TOD safeguards that clock, i.e. a TOD maintenance clock cycle Δ X are equal to TOD sampling and receive clock
Period is 8ns.
10. a kind of 1PPS+TOD information monobus based on claim 8 system transmits synchronous method characterized by comprising
The sampling number per second to local TOD information is arranged by the first sampling module in transmitting terminal, and samples storage is to storage mould
In block, check field that framing module is calculated using correction verification module carries out a framing to the TOD information acquired every time, then by
Coding sending module sends receiving end to after carrying out serial code to TOD frame to be sent；
Second sampling module of receiving end finds the symbol of TOD coded bit stream in the local clock domain that receiving end provides
Intermediate time simultaneously samples, and frame synchronization module carries out frame synchronization by finding frame originating point information, judges whether there is frame loss；Then to looking for
TOD frame to frame originating point information is decoded and frame decoding, each field solved, by verification and in a manner of to check word in TOD frame
Duan Jinhang verification；When TOD frame check is correct and without losing, TOD maintenance module updates local TOD using correct TOD, every
A clock cycle is synchronous from adding a TOD maintenance clock cycle Δ X to complete real-time TOD；For TOD frame loss or check errors
When, the TOD frame that TOD maintenance module is properly received using the last time is real-time from adding a TOD maintenance clock cycle Δ X to complete
TOD is synchronous.
11. 1PPS+TOD information monobus as claimed in claim 10 transmits synchronous method, it is characterised in that: frame synchronization module
The specific pattern that frame head is found in a manner of sliding transfer register completes frame synchronization, by two TOD frame frame heads of monitoring when
Between interval with whether the sampling transmission time interval between two TOD frames of transmitting terminal equal judges whether there is frame loss.
12. 1PPS+TOD information monobus as claimed in claim 11 transmits synchronous method, it is characterised in that: transmitting terminal is local
Clock domain is 125M, and the TOD frame after framing uses 25Mbits/s code chip rate, i.e., practical with the effective of 6.25Mbits/s
Inter-area traffic interarea sends receiving end to；Locally sampling receives clock as 125M to receiving end TOD, which is used as simultaneously receives TOD
Sampling clock and TOD safeguard that clock, i.e. TOD maintenance clock cycle Δ X are equal to TOD sampling and receive the clock cycle, be
8ns。
13. 1PPS+TOD information monobus as claimed in claim 11 transmits synchronous method, it is characterised in that: the sheet of transmitting terminal
Ground 125M clock and the local 125M clock of receiving end are mutually independent clock domain, and the frequency deviation of the two 125M clock domains controls
Within 100ppm, the precision of receiving end recovers at this time TOD real-time time and transmitting terminal TOD real-time time ± 10ns with
It is interior.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710321906.7A CN107171762B (en) | 2017-05-09 | 2017-05-09 | A kind of 1PPS+TOD information monobus transmission synchronization system and method |
| PCT/CN2017/111567 WO2018205542A1 (en) | 2017-05-09 | 2017-11-17 | Synchronization system and method for single-bus transmission of 1pps+tod information |
| PH12019500991A PH12019500991A1 (en) | 2017-05-09 | 2019-05-03 | Synchronization system and method for single-bus transmission of 1pps+tod information |
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| CN201710321906.7A CN107171762B (en) | 2017-05-09 | 2017-05-09 | A kind of 1PPS+TOD information monobus transmission synchronization system and method |
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| CN107171762B (en) * | 2017-05-09 | 2019-04-02 | 烽火通信科技股份有限公司 | A kind of 1PPS+TOD information monobus transmission synchronization system and method |
| CN109818701B (en) * | 2019-02-19 | 2021-03-02 | 烽火通信科技股份有限公司 | High-precision clock synchronization method and system for communication equipment |
| CN110708133B (en) * | 2019-09-29 | 2021-07-27 | 杭州晨晓科技股份有限公司 | Method and device for clock synchronization and time synchronization in system based on FPGA |
| CN111447028B (en) * | 2020-02-29 | 2022-05-24 | 新华三信息安全技术有限公司 | Time synchronization method and device |
| CN111478745A (en) * | 2020-04-09 | 2020-07-31 | 浙江赛思电子科技有限公司 | Clock time transmission protocol device and protocol method thereof |
| CN111600825B (en) * | 2020-05-16 | 2023-05-12 | 青岛鼎信通讯股份有限公司 | Synchronization method based on equidistant time pulses |
| CN111988106B (en) * | 2020-08-25 | 2023-09-05 | 广东省新一代通信与网络创新研究院 | Synchronization system for single-wire transmission of PPS and TOD information |
| CN112131159B (en) * | 2020-09-21 | 2022-09-23 | 苏州盛科通信股份有限公司 | ToD message processing method and system based on embedded CPU |
| CN112202525B (en) * | 2020-10-29 | 2022-11-01 | 电信科学技术第五研究所有限公司 | PPS delay automatic measurement and compensation method of multi-board card equipment |
| CN112946702B (en) * | 2021-01-27 | 2022-10-11 | 自然资源部第一海洋研究所 | Marine mammal underwater sounding distributed online monitoring system |
| CN113316245B (en) * | 2021-04-30 | 2022-11-18 | 新华三技术有限公司 | Method and device for aligning air interface system frames |
| CN114414164A (en) * | 2021-12-21 | 2022-04-29 | 山东科技大学 | Pipeline leakage monitoring method and system |
| CN115189981B (en) * | 2022-06-30 | 2023-12-01 | 东风汽车集团股份有限公司 | Lin bus interface based on master-slave reusability |
| CN116578521A (en) * | 2023-07-14 | 2023-08-11 | 深圳中安辰鸿技术有限公司 | Single-bus communication method, device, system and equipment |
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- 2017-11-17 WO PCT/CN2017/111567 patent/WO2018205542A1/en active Application Filing
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| PH12019500991A1 (en) | 2019-12-02 |
| WO2018205542A1 (en) | 2018-11-15 |
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