CN101860402A - Parallel data transmission method for reducing EMI - Google Patents
Parallel data transmission method for reducing EMI Download PDFInfo
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- CN101860402A CN101860402A CN201010193068A CN201010193068A CN101860402A CN 101860402 A CN101860402 A CN 101860402A CN 201010193068 A CN201010193068 A CN 201010193068A CN 201010193068 A CN201010193068 A CN 201010193068A CN 101860402 A CN101860402 A CN 101860402A
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 84
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000011084 recovery Methods 0.000 claims description 10
- 230000000295 complement effect Effects 0.000 claims description 6
- 208000032365 Electromagnetic interference Diseases 0.000 description 9
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Abstract
The invention relates to a parallel data transmission method for reducing EMI. The method comprises the following steps: 1) parallel data are received; 2) when the received parallel data are initial data, the step 3) is executed; if not the step 4) is executed; 3) when the received parallel data are initial data, the parallel data to be transmitted are the same as the received parallel data, the polarity is low level on; 4) if the received parallel data are subsequent data, the XOR operation between the currently received parallel data and the parallel data which are received a moment before is performed, W-numbered XOR results contain M-numbered 0 and N-numbered 1; when N is not more than half of W, the parallel data to be transmitted are the currently received parallel data and the polarity is low level on; when N is more than half of W, the parallel data to be transmitted are the ones-complement code of the currently received parallel data and the polarity is high level on; 5) the parallel data and the corresponding polarity are transmitted; and 6) the corresponding parallel data are recovered. By using the method of the invention, EMI in the transmission process of parallel data can be reduced and the accuracy of data transmission is increased.
Description
Technical field
The present invention relates to a kind of parallel data transmission method, especially the parallel data transmission method of a kind of minimizing EMI (Electro-MagneticInterference), specifically a kind of harm that reduces environmental noise on human class health, and the parallel data transmission method of raising transfer of data accuracy rate.
Background technology
In the transmission of parallel data, the EMI on the transmission line (electromagnetic interference) can be along with the raising of message transmission rate, and the increase of data transaction frequency and strengthening.The harm of EMI generally acknowledges that it not only can influence the health of human body, also disturbs self and the data processing or the transfer of data of electronic system on every side.Therefore, reducing EMI as much as possible in the parallel data transmission is very important.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, the parallel data transmission method of a kind of EMI of minimizing is provided, the electromagnetic interference when it can effectively reduce the parallel data transmission, the accuracy rate when improving the parallel data transmission.
According to technical scheme provided by the invention, the parallel data transmission method of described minimizing EMI, described parallel data transmission method comprises the steps:
A, reception parallel data row_data, the width of described parallel data row_data is W;
B, when the parallel data row_data of described reception is primary data, execution in step c; When the parallel data row_data of described reception is follow-up data, execution in step d;
C, when the parallel data row_data of described reception is primary data, obtain corresponding transmission parallel data send_data and corresponding polarity POL; The width of the parallel data send_data of described transmission is W, and polarity POL is a low level, and the parallel data send_data parallel data row_data that equals to receive of transmission;
D, when the parallel data row_data that receives is follow-up data, obtain corresponding transmission parallel data send_data and corresponding polarity POL, the width of described transmission parallel data send_data is W; The XOR of the reception parallel data row_data that current reception parallel data row_data is corresponding with previous moment, and obtain the result of W XOR, comprise M " 0 " and N individual " 1 " among described W the XOR result, and M+N=W; When N among W the XOR result≤W/2, transmission parallel data send_data is current reception parallel data row_data, and polarity POL is a low level; When N among W the XOR result＞W/2, transmission parallel data send_data is the radix-minus-one complement of current reception parallel data row_data, and polarity POL is a high level;
E, the described transmission parallel data send_data of transmission and corresponding polarity POL;
F, according to transmission parallel data send_data and corresponding polarity POL, recover corresponding parallel data row_data.
Parallel data row_data after the described recovery has postponed two transfer clocks with the reception parallel data.Among the step f, when described polarity POL was low level, the parallel data row_data after the described recovery was transmission parallel data send_data; When described polarity POL was high level, the parallel data row_data after the described recovery was the radix-minus-one complement of transmission parallel data send_data.
Advantage of the present invention: by the parallel data in adjacent two moment is carried out analyzing and processing, and described analysis processing result data are judged, thereby determine the transmission parallel data, make the number minimum of the saltus step of transmission parallel data, reduce the electromagnetic interference in the data transmission procedure, improved the accuracy rate of transfer of data.
Description of drawings
Fig. 1 obtains transmitting the schematic diagram of parallel data for the present invention.
Fig. 2 recovers the process schematic diagram of parallel data for the present invention.
Embodiment
The invention will be further described below in conjunction with concrete drawings and Examples.
Usually, the speed of parallel data transmission is stable and synchronous, and the variation of data all keeps synchronously with a certain clock.So-called message transmission rate is exactly the speed of corresponding clock in fact; General this clock and these data/address buss of getting along well are put together.
In the parallel data transmission course, have saltus step in various degree between plurality of data; And the saltus step meeting between data produces electromagnetic interference, in order to reduce the electromagnetic interference in the parallel data transmission course, can adopt following parallel data transmission method, and described parallel data transmission method comprises the steps:
A, reception parallel data row_data, the width of described parallel data row_data is W;
B, when the parallel data row_data of described reception is primary data, execution in step c; When the parallel data row_data of described reception is follow-up data, execution in step d;
C, when the parallel data row_data of described reception is primary data, obtain corresponding transmission parallel data send_data and corresponding polarity POL; The width of the parallel data send_data of described transmission is W, and polarity POL is a low level, and the parallel data send_data parallel data row_data that equals to receive of transmission;
D, when the parallel data row_data that receives is follow-up data, obtain corresponding transmission parallel data send_data and corresponding polarity POL, the width of described transmission parallel data send_data is W; The XOR of the reception parallel data row_data that current reception parallel data row_data is corresponding with previous moment, and obtain the result of W XOR, comprise M " 0 " and N individual " 1 " among described W the XOR result, and M+N=W; When N among W the XOR result≤W/2, transmission parallel data send_data is current reception parallel data row_data, and polarity POL is a low level; When N among W the XOR result＞W/2, transmission parallel data send_data is the radix-minus-one complement of current reception parallel data row_data, and polarity POL is a high level;
The reception parallel data row_data that the reception parallel data row_data of current time is corresponding with previous moment carries out XOR, when carrying out XOR, two groups of parallel datas is carried out XOR by turn, thereby can access W XOR result; During XOR, when the data of corresponding position were identical, the XOR result was " 0 "; When the data of corresponding position not simultaneously, the XOR result is " 1 ".The XOR result is " 0 ", saltus step does not take place in the numerical value of the reception parallel data row_data of expression current time, when the XOR result is " 1 ", saltus step has taken place in the numeral of the reception parallel data row_data of expression current time, this saltus step result can disturb producing in the parallel data transmission course, therefore we will reduce data saltus step amount total in the parallel data transmission course, can help reducing total electromagnetic interference;
By the reception parallel data row_data of the current time reception parallel data row_data corresponding with previous moment carried out XOR, and N and the XOR magnitude relationship of W as a result in the analysis XOR, guarantee to make the saltus step amount minimum of parallel data data in the transmission data procedures, farthest reduce the electromagnetic interference of parallel data transmission course;
E, the described transmission parallel data send_data of transmission and corresponding polarity POL;
F, according to transmission parallel data send_data and corresponding polarity POL, recover corresponding parallel data row_data; Recovering transmission parallel data send_data, when obtaining corresponding parallel data row_data, when described polarity POL was low level, the parallel data row_data after the described recovery was transmission parallel data send_data; When described polarity POL was high level, the parallel data row_data after the described recovery was the radix-minus-one complement of transmission parallel data send_data.
In above-mentioned parallel data transmission course, just at transmission parallel data send_data simultaneously, the corresponding polarity POL that also will transmit parallel data send_data transmits, so that transmission parallel data send_data can be recovered accurately.Can just transmission parallel data send_data and corresponding polarity POL can be transmitted simultaneously by increasing data transmission channel; Compare the influence that the electromagnetic interference that produces in the parallel data transmission course is brought, the complexity and the cost of described transmission method are less.Just postponed two clocks between the parallel data row_data after the recovery and the parallel data row_data of reception, can the accuracy of data not exerted an influence.
Fig. 1 and Fig. 2 illustrate transmission course of the present invention for the parallel data with W=16 is an example.As depicted in figs. 1 and 2: transfer of data obtains receiving parallel data row_data behind receiving terminal; Compare processing by reception parallel data, can access corresponding transmission parallel data send_data and corresponding polarity POL current time and previous moment correspondence.Transmission parallel data send_data and corresponding polarity POL are transmitted simultaneously, and transmission parallel data send_data and corresponding polarity POL are recovered at receiving terminal, can access original parallel data value is row_data, said process is two reciprocal processes, can realize easily fully.As can be seen from Figure 1, if adopt present parallel data transmission method, data width is that the number of times that data saltus step (0-＞1 or 1-＞0) will take place W=16 is 62 times among Fig. 1 so, if but adopt data transmission method of the present invention, data width is that W=16 data transition times has only 8 times so, well below original transition times, thereby reached the purpose that reduces EMI.
Claims (3)
1. a parallel data transmission method that reduces EMI is characterized in that, described parallel data transmission method comprises the steps:
(a), receive parallel data row_data, the width of described parallel data row_data is W;
(b), when the parallel data row_data of described reception is primary data, execution in step (c); When the parallel data row_data of described reception is follow-up data, execution in step (d);
(c), when the parallel data row_data of described reception is primary data, obtain corresponding transmission parallel data send_data and corresponding polarity POL; The width of the parallel data send_data of described transmission is W, and polarity POL is a low level, and the parallel data send_data parallel data row_data that equals to receive of transmission;
(d), when the parallel data row_data that receives is follow-up data, obtain corresponding transmission parallel data send_data and corresponding polarity POL, the width of described transmission parallel data send_data is W; The XOR of the reception parallel data row_data that current reception parallel data row_data is corresponding with previous moment, and obtain the result of W XOR, comprise M " 0 " and N individual " 1 " among described W the XOR result, and M+N=W; When N among W the XOR result≤W/2, transmission parallel data send_data is current reception parallel data row_data, and polarity POL is a low level; When N among W the XOR result＞W/2, transmission parallel data send_data is the radix-minus-one complement of current reception parallel data row_data, and polarity POL is a high level;
(e), described transmission parallel data send_data of transmission and corresponding polarity POL;
(f), according to transmission parallel data send_data and corresponding polarity POL, the parallel data row_data that recovery is corresponding.
2. according to the parallel data transmission method of the described minimizing of claim 1 EMI, it is characterized in that: the parallel data row_data after the described recovery has postponed two transfer clocks with the reception parallel data.
3. according to the parallel data transmission method of the described minimizing of claim 1 EMI, it is characterized in that: in the step (f), when described polarity POL was low level, the parallel data row_data after the described recovery was transmission parallel data send_data; When described polarity POL was high level, the parallel data row_data after the described recovery was the radix-minus-one complement of transmission parallel data send_data.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102141969A (en) * | 2011-03-02 | 2011-08-03 | 浪潮(北京)电子信息产业有限公司 | Data transmission method and system in serial circuit |
| CN102769499A (en) * | 2012-07-26 | 2012-11-07 | 南京华士电子科技有限公司 | Conducted EMI (electro-magnetic interference) noise suppression method of complex electronic system |
| CN105823975A (en) * | 2015-01-07 | 2016-08-03 | 展讯通信（上海）有限公司 | Waveform file processing method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101431883A (en) * | 2007-11-09 | 2009-05-13 | 英业达股份有限公司 | Apparatus and method for low-electromagnetic interference signal transmission |
| CN101561998A (en) * | 2008-04-14 | 2009-10-21 | 北京京东方光电科技有限公司 | Method and device for processing data of liquid crystal display |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101431883A (en) * | 2007-11-09 | 2009-05-13 | 英业达股份有限公司 | Apparatus and method for low-electromagnetic interference signal transmission |
| CN101561998A (en) * | 2008-04-14 | 2009-10-21 | 北京京东方光电科技有限公司 | Method and device for processing data of liquid crystal display |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102141969A (en) * | 2011-03-02 | 2011-08-03 | 浪潮(北京)电子信息产业有限公司 | Data transmission method and system in serial circuit |
| CN102769499A (en) * | 2012-07-26 | 2012-11-07 | 南京华士电子科技有限公司 | Conducted EMI (electro-magnetic interference) noise suppression method of complex electronic system |
| CN102769499B (en) * | 2012-07-26 | 2014-06-04 | 南京华士电子科技有限公司 | Conducted EMI (electro-magnetic interference) noise suppression method of complex electronic system |
| CN105823975A (en) * | 2015-01-07 | 2016-08-03 | 展讯通信（上海）有限公司 | Waveform file processing method |
| CN105823975B (en) * | 2015-01-07 | 2018-12-21 | 展讯通信（上海）有限公司 | A method of processing wave file |
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