CN105243043B - The method for realizing high speed serial communication data filtering - Google Patents
The method for realizing high speed serial communication data filtering Download PDFInfo
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- CN105243043B CN105243043B CN201510570168.0A CN201510570168A CN105243043B CN 105243043 B CN105243043 B CN 105243043B CN 201510570168 A CN201510570168 A CN 201510570168A CN 105243043 B CN105243043 B CN 105243043B
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- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000001914 filtration Methods 0.000 title claims abstract description 31
- 238000004891 communication Methods 0.000 title claims abstract description 30
- 239000000835 fiber Substances 0.000 claims description 2
- 230000001360 synchronised effect Effects 0.000 abstract description 17
- 108010076504 Protein Sorting Signals Proteins 0.000 abstract description 8
- 230000007613 environmental effect Effects 0.000 abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 230000006872 improvement Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
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- 238000001514 detection method Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/38—Information transfer, e.g. on bus
- G06F13/42—Bus transfer protocol, e.g. handshake; Synchronisation
- G06F13/4282—Bus transfer protocol, e.g. handshake; Synchronisation on a serial bus, e.g. I2C bus, SPI bus
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2213/00—Indexing scheme relating to interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F2213/0002—Serial port, e.g. RS232C
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- General Engineering & Computer Science (AREA)
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Abstract
The present invention relates to a kind of method for realizing high speed serial communication data filtering, including when receiving invalid data sequence, valid data counter can reset to pre-set threshold value at once, invalid data counter can add 1, and compared with threshold values B, when more than threshold values B, then it is assumed that data invalid, when not less than threshold values B, then it is assumed that data are effective；, first can be compared with threshold value A after valid data sequence or effective Comma shorter sequences is received, when length is more than or equal to A, invalid data counter subtracts 1, and successively compared with threshold range.Using this kind of method, the filtration treatment to the shorter valid data sequence with Comma is realized, synchronous signal sequence is more steady, and link stability increases, it is ensured that the integrality and correctness of the valid data synchronously received；Reduce interference of the noise to adjacent channel；Critical imprinting line can be adjusted according to real-time application environment, the application synchronously detected is wider, is adapted to various environmental models.
Description
Technical field
The present invention relates to communication technical field, more particularly to high-speed serial data communication technical field, in particular to one kind
The method for realizing high speed serial communication data filtering.
Background technology
Synchronizing signal in high speed serial communication be used for representing data receiver whether with transmitting terminal (or serial input
Data) it is synchronous, so as to which whether the data for being used to refer to receive are effective, and whether receiving port needs generation state to shift
Deng being such as transferred to link lost condition or reverse transition from link normal condition.For a unstable or noisy link,
It is possible to receive data sequence as shown in Figure 1, if can not effectively be filtered, it is possible to cause the mistake of whole Link State
Disorderly.
Situation 1：It is mingled with a shorter invalid data sequence (noise) in two longer valid data sequences；
Situation 2：It is mingled with a shorter valid data sequence (being actually noise) in two invalid data sequences；
Situation 3：Being mingled with a shorter valid data sequence with Comma in two invalid data sequences (is actually
Noise, Comma are mainly used to align data in high speed serial communication)；
Situation 4：Invalid data sequence is followed by Comma and longer valid data sequence
Data filtering methods general at present：Based on the filtering method with comma values
This method is on the basis of data are correctly decoded (effective or invalid), according to lower Fig. 2 synchronous state machines transfer principle figure
State transition is synchronized, synchronous, mistake is first defined to the filtration treatment of valid data and invalid data together so as to realize
Step and three kinds of states of presynchronization, and set one and lose synchronous threshold value Rx_LOS_HOLD, when the invalid data of reception
Sequence accumulation is when being less than Rx_LOS_HOLD, can keep with data syn-chronization before, when the invalid data sequence of reception adds up to be equal to
During Rx_LOS_HOLD, then synch lost state can be entered, now data are invalid data.Needed under the state etc. waiting
Next presynchronization state can just be entered by receiving comma signals, can be always maintained at losing synchronous regime if without comma signals.
If receiving the individual valid data sequences of N (N value can self-defining) again presynchronization state is continuous, synchronous shape can be just actually entered
State, under presynchronization state when invalid data sequence is received, synchronous regime the method is lost in rebound at once being capable of effective mistake
The noise of situation 1 and situation 2 is filtered, but shorter effective comma sequences can not be filtered well, under such as situation 3 and situation 4
Noise.For example an invalid sequence is closelyed follow after an effective comma, the new comma that now has another one again quickly is effective
Sequence, cause a comma sequence followed by invalid data sequence also have not enough time to handle, just enter again quickly pre- same
Step.So circulation, it is most likely that cause link vacation LINK.The synchronizing signal obtained using the filter method is as shown in Figure 3.
Summarize it is above-mentioned it is general can draw, general synchronization detecting method have ignored to Comma it is shorter effectively
The processing of data sequence.
The content of the invention
The purpose of the present invention is the shortcomings that overcoming above-mentioned prior art, there is provided one kind, which can be realized, improves link stabilization
Property, reduce noise to adjacent-channel interference, have broader applications scope the method for realizing high speed serial communication data filtering.
To achieve these goals, the method for realizing high speed serial communication data filtering of the invention has following form：
This realizes the method for high speed serial communication data filtering, and it is mainly characterized by, and described method comprises the following steps：
(1) serial communication data are received；
(2) judge the data sequence type received, if being non-invalid data sequence, continue step (3), if
Invalid data sequence, then continue step (5)；
(3) judge whether the valid data quantity continuously received exceedes predetermined threshold value A, if it is, continue step (4),
Otherwise step (1) is continued；
(4) invalid counting value of invalid data counter subtracts 1, then proceedes to step (6)；
(5) invalid counting value described in adds 1, then proceedes to step (6)；
(6) judge whether described invalid counting value size is more than predetermined threshold value B, if it is, think data invalid, it is no
Then think that data are effective.
It is preferred that described non-invalid data sequence is valid data sequence or effective Comma data sequences.
It is preferred that described step (3), comprises the following steps：
Effective count value of (3-1) valid data counter adds 1；
(3-2) judges whether described effective count value is more than predetermined threshold value A, if it is, continue step (3-3), it is no
Then continue step (1)；
Effective count value described in (3-3) is reset to predetermined threshold value A, then proceedes to step (4)；
Described step (5), comprises the following steps：
Effective count value described in (5-1) is reset to predetermined threshold value A, then proceedes to step (5-2)；
Invalid counting value described in (5-2) adds 1, then proceedes to step (6).
More preferably, described predetermined threshold value A is the length value for presetting effective data bit.
It is preferred that described serial communication data are fiber optic serial communication data.
The method for realizing high speed serial communication data filtering in the invention is employed, is had the advantages that：
(1) filtration treatment to the shorter valid data sequence with Comma, the synchronous signal sequence after improvement are realized
More steady, link stability increases, it is ensured that the integrality and correctness of the valid data synchronously received；
(2) interference of the noise to adjacent channel is reduced；
(3) critical imprinting line can be adjusted according to real-time application environment, the application synchronously detected is wider, is adapted to various
Environmental model.
Brief description of the drawings
Fig. 1 is reception signal sequence chart.
Fig. 2 is the schematic diagram for the method for filtering communication data in the prior art.
Fig. 3 is using the synchronous signal sequence schematic diagram that filter method obtains in the prior art.
Fig. 4 is the cylinder water column scale model work principle of filter of the method for realizing high speed serial communication data filtering of the present invention
Figure.
Fig. 5 is the synchronous signal sequence signal realized the method for high speed serial communication data filtering and obtained using the present invention
Figure.
Fig. 6 is the flow chart of the method for realizing high speed serial communication data filtering of the present invention.
Embodiment
In order to more clearly describe the technology contents of the present invention, carried out with reference to specific embodiment further
Description.
Based on drum water column scale model innovation data filtering method：
After the method is correctly decoded basis based on high-speed serial data, data sequence can be judged first (effectively also
It is invalid), for valid data sequence and effective comma, think effective, then valid data and invalid data are set
One critical scale value, according to the change of the critical value range, further filter making an uproar under situation 3 and situation 4 in such as Fig. 1
Sound.So as to the link more stablized.
Its principle model below figure 4, a drum water column illustraton of model is devised, and define a critical scale A.Work as reception
When end receives invalid data sequence, equivalent to a certain amount of water is injected in cylinder bucket, now water scale can be corresponded to and raised,
When water scale increases but still is less than critical scale value A, data remain in that effectively, when water scale is higher than critical scale
During value, now think that data are no longer valid, for now carrying out a shorter effective comma, be reduced to insufficient for scale
Below critical value, effective comma can be filtered out actually.It is achieved thereby that the noise filtering for situation 3 and situation 4.
Synchronous signal sequence after filtering is as shown in Figure 5.
A kind of flow chart of high speed serial communication data filtering methods of the present invention is illustrated in figure 6, in actual applications,
The filtration treatment to the shorter valid data sequence with Comma is realized, the synchronous signal sequence after improvement is more steady, enters
One step improves link stability, can adjust the imprinting line of drum water column model, synchronous inspection according to real-time application environment in addition
The application of survey is wider, is adapted to the synchronous detection of various environmental models.
This synchronization detecting method can be applied to the data filtering of FC communications fields bottom.As shown in fig. 6, it is data filtering
Fpga logic implementation process figure, a valid data sequence counter Valid_cnt and invalid data sequence count are defined first
Device Invalid_cnt, and the critical threshold values A and B of a maximum is pre-set to counter respectively.A represents the length of valid data position
Angle value, B represent default Invalid_cnt threshold values.For the data sequence received, effective and invalid data is divided into after decoding
2 kinds of sequence, processing mode is as follows：
(1) when receiving invalid data sequence, Valid_cnt can reset to pre-set threshold value, Invalid_cnt meetings at once
Add 1, and compared with threshold values B, when more than threshold values B, then it is assumed that data invalid, when not less than threshold values B, then it is assumed that data
Effectively.
(2), first can be with the length of valid data sequence after valid data sequence or effective Comma shorter sequences is received
Degree A is compared, and when length is more than or equal to A, Valid_cnt can send out a pulse signal, trigger invalid counter
Invalid_cntB subtracts 1, and successively compared with threshold range.
Noise under such as situation 3 and situation 4 may filter that according to the threshold range, follow-up data is handled successively.
The method for realizing high speed serial communication data filtering in the invention is employed, is had the advantages that：
(1) filtration treatment to the shorter valid data sequence with Comma, the synchronous signal sequence after improvement are realized
More steady, link stability increases, it is ensured that the integrality and correctness of the valid data synchronously received；
(2) interference of the noise to adjacent channel is reduced；
(3) critical imprinting line can be adjusted according to real-time application environment, the application synchronously detected is wider, is adapted to various
Environmental model.
In this description, the present invention is described with reference to its specific embodiment.But it is clear that it can still make
Various modifications and alterations are without departing from the spirit and scope of the present invention.Therefore, specification and drawings are considered as illustrative
It is and nonrestrictive.
Claims (5)
- A kind of 1. method for realizing high speed serial communication data filtering, it is characterised in that described method includes：(1) serial communication data are received；(2) judge the data sequence type received, if being non-invalid data sequence, continue step (3), if invalid Data sequence, then continue step (5)；(3) judge whether the valid data quantity continuously received exceedes predetermined threshold value A, if it is, continuing step (4), otherwise Continue step (1)；(4) invalid counting value of invalid data counter subtracts 1, then proceedes to step (6)；(5) invalid counting value described in adds 1, then proceedes to step (6)；(6) judge whether described invalid counting value size is more than predetermined threshold value B, if it is, thinking data invalid, otherwise recognize It is effective for data.
- 2. the method according to claim 1 for realizing high speed serial communication data filtering, it is characterised in that described non-nothing It is valid data sequence or effective Comma data sequences to imitate data sequence.
- 3. the method according to claim 1 for realizing high speed serial communication data filtering, it is characterised in that described step (3), comprise the following steps：Effective count value of (3-1) valid data counter adds 1；(3-2) judges whether described effective count value is more than predetermined threshold value A, if it is, continuation step (3-3), otherwise after Continuous step (1)；Effective count value described in (3-3) is reset to predetermined threshold value A, then proceedes to step (4)；Described step (5), comprises the following steps：Effective count value described in (5-1) is reset to predetermined threshold value A, then proceedes to step (5-2)；Invalid counting value described in (5-2) adds 1, then proceedes to step (6).
- 4. the method according to claim 3 for realizing high speed serial communication data filtering, it is characterised in that described is default Threshold value A is to preset the length value of effective data bit.
- 5. the method according to claim 1 for realizing high speed serial communication data filtering, it is characterised in that described is serial Communication data is fiber optic serial communication data.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1211122A (en) * | 1998-08-04 | 1999-03-17 | 国家科学技术委员会高技术研究发展中心 | Segment synchronizing detection method in digital communication |
| CN1570900A (en) * | 2004-04-27 | 2005-01-26 | 北京长信嘉信息技术有限公司 | A data transmitting and receiving method for serial data |
| US8959268B2 (en) * | 2012-03-09 | 2015-02-17 | Canon Kabushiki Kaisha | Information processing apparatus, serial communication system, method of initialization of communication therefor and serial communication apparatus |
-
2015
- 2015-09-09 CN CN201510570168.0A patent/CN105243043B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1211122A (en) * | 1998-08-04 | 1999-03-17 | 国家科学技术委员会高技术研究发展中心 | Segment synchronizing detection method in digital communication |
| CN1570900A (en) * | 2004-04-27 | 2005-01-26 | 北京长信嘉信息技术有限公司 | A data transmitting and receiving method for serial data |
| US8959268B2 (en) * | 2012-03-09 | 2015-02-17 | Canon Kabushiki Kaisha | Information processing apparatus, serial communication system, method of initialization of communication therefor and serial communication apparatus |
Non-Patent Citations (1)
| Title |
|---|
| 基于 F P G A 的光纤通信系统中帧同步头检测设计;韩红霞等;《电光与控制》;20060831;第13卷(第4期);第90-92页 * |
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Effective date of registration: 20240122 Address after: Floor 12, Building 5, No. 18 Qingjiang South Road, Gulou District, Nanjing City, Jiangsu Province, 210000 Patentee after: NANJING QUANXIN CABLE TECHNOLOGY Co.,Ltd. Country or region after: China Address before: Room 402, Building 23, No. 487 Tianlin Road (Baoshiyuan), Xuhui District, Shanghai, 200233 Patentee before: SHANGHAI SAIZHI INFORMATION TECHNOLOGY Co.,Ltd. Country or region before: China |