CN101795137A - Method for adjusting wave form of Manchester code - Google Patents
Method for adjusting wave form of Manchester code Download PDFInfo
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- CN101795137A CN101795137A CN201010104149A CN201010104149A CN101795137A CN 101795137 A CN101795137 A CN 101795137A CN 201010104149 A CN201010104149 A CN 201010104149A CN 201010104149 A CN201010104149 A CN 201010104149A CN 101795137 A CN101795137 A CN 101795137A
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Abstract
The invention discloses a method for adjusting the wave form of a Manchester code. The method comprises the following steps: respectively sampling a positive signal and a negative signal which are generated by the Manchester code through a two-channel transceiver; setting a positive synchronous signal and a negative synchronous signal which respectively lag behind the positive signal and the negative signal; detecting the hopping edges of the positive signal and the negative signal so as to generate a monitoring signal for monitoring whether information is over or not; and carrying out wave form adjustment according to the hopping edge of a corresponding signal detected by the monitoring signal. The method for adjusting the wave form of the Manchester code can convert the wave form of zero passage hop deviating the bit time middle point generated by the two-channel transceiver into the Manchester code form of the zero passage hop at the bit time middle point, thereby facilitating follow-up sampling and decoding, and improving the reliability of decoding.
Description
Technical field
The present invention relates to a kind of Waveform regulating method, especially the Waveform regulating method of Manchester code.
Background technology
In recent years, Ke Xuejishu continuous development makes aviation electronics synthesization system also constantly develop and improve.1553B is widely used in the electronics networked system in fields such as Aeronautics and Astronautics, military affairs as high reliability and real-time communication bus, and the key component of 1553B bus system is the protocol interface processor.Yet the special chip of the 1553B protocol processor of present domestic use is all bought from foreign vendor, though the domestic research that has this to be correlated with, but still the technology of not producing this special chip, a kind of scheme adopts FPGA to realize that agreement is by adding transformer output, between protocol processor and transformer, using the binary channels transceiver shortens the hopping edge time and drive current is provided, but the binary channels transceiver has been because of its analog feature has produced the waveform of zero passage saltus step mid point when departing from, needs a kind of Waveform regulating method to make it be converted into the Manchester code type of the zero passage saltus step of being convenient to subsequent sampling decoding mid point when being in before decoding.
The employed message format of 1553B is comparatively complicated, but basic message component units is a word, and word is by 1 synchronous head, and 16 data bit and 1 parity check bit are formed.The employed numeric data code type of transmission is a Manchester code on the 1553B bus, but except the synchronous head, it is an invalid Manchester code type, when its width is three positions, it in the time of preceding 3/2 high level 1 (perhaps low level 0), in the time of back 3/2 is low level 0 (perhaps high level 1), logical zero Manchester code in the bit stream sends 0 in the preceding half-bit time, half transmission 1 in back, logical one Manchester code in the bit stream sends 1 in the preceding half-bit time, half transmission 0 in back, the mid point when the zero passage saltus step occurs in each.
Summary of the invention
A waveform of mid point when the Waveform regulating method that the purpose of this invention is to provide a kind of Manchester code, the zero passage saltus step that the binary channels transceiver can be produced depart from, a Manchester code type of mid point when being converted to the zero passage saltus step and being in.
The Waveform regulating method of Manchester code of the present invention comprises the steps:
In the 1. step, positive signal and negative signal that the Manchester code of sampling respectively produces through the binary channels transceiver detect the hopping edge of positive signal and negative signal; Set positive synchronizing signal a, the time that positive synchronizing signal a lags behind positive signal is t1, sets negative synchronizing signal b, and the time that negative synchronizing signal b lags behind negative signal is t1, t1＞tRG, tRG are that Manchester code is through the positive signal pulse of binary channels transceiver generation and the blanking time of negative signal pulse;
The 2. step, detect the positive signal trailing edge to the t2 that delays time between the negative signal rising edge, compare with tRG, come monitoring message whether to finish, pilot signal CHECK is set with this, if t2＞tRG, the then end of message, pilot signal CHECK puts high level " 1 " and entered for the 3. step, if t2＜tRG, then message does not finish, and pilot signal CHECK puts low level " 0 " and entered for the 4. step;
The 3. step, detect the positive signal trailing edge after, waveform put low level " 0 " and keep, returned for the 1. step, otherwise, continue to detect;
The 4. step, detect positive synchronizing signal a rising edge after, waveform put high level " 1 " and keep, detect negative synchronizing signal b rising edge after, waveform put low level " 0 " and keep, returned for the 1. step, otherwise, continue to detect.
The invention has the advantages that:
A waveform of mid point when the Waveform regulating method of Manchester code of the present invention, the zero passage saltus step that the binary channels transceiver can be produced depart from, the Manchester code type of mid point is convenient to the subsequent sampling decoding when being converted to the zero passage saltus step and being in, improves decoding reliability.
Description of drawings
Fig. 1 is a binary channels transceiver output waveform figure;
The waveform sequential chart that Fig. 2 adjusts for waveform.
Embodiment
With reference to Fig. 1, among the figure, input signal Vin is a Manchester code, positive signal RXP and negative signal RXN that Manchester code produces through the binary channels transceiver, as seen the waveform of binary channels transceiver output, though shortened the hopping edge time, but output waveform is distortion, be converted to when position unequal sign indicating number type of high-low level, the zero crossing that tDR represents to import among the figure is to the time of delay of changing back positive signal RXP and negative signal RXN rising edge, and tRG represents the positive signal pulse and the time in negative signal pulse spacing that Manchester code produces through the binary channels transceiver.
The waveform sequential of waveform adjustment is seen Fig. 2, and waveform is adjusted detailed process and is: in the 1. step, positive signal RXP and negative signal RXN that the Manchester code of sampling respectively produces through the binary channels transceiver detect the hopping edge of positive signal RXP and negative signal RXN; Set positive synchronizing signal a, the time that positive synchronizing signal a lags behind positive signal is t1, sets negative synchronizing signal b, and the time that negative synchronizing signal b lags behind negative signal is t1, t1＞tRG, tRG are that Manchester code is through the positive signal pulse of binary channels transceiver generation and the blanking time of negative signal pulse;
The 2. step, detect positive signal trailing edge RXP_NEG to the t2 that delays time between the negative signal rising edge RXN_POS, compare with tRG, come monitoring message whether to finish, pilot signal CHECK is set with this, if t2＞tRG, the then end of message, pilot signal CHECK puts high level " 1 " and entered for the 3. step, if t2＜tRG, then message does not finish, and pilot signal CHECK puts low level " 0 " and entered for the 4. step;
The 3. step, detect positive signal trailing edge RXP_NEG after, waveform RX put low level " 0 " and keep, returned for the 1. step, otherwise, continue to detect;
The 4. step, detect positive synchronizing signal a rising edge a_POS after, waveform RX put high level " 1 " and keep, detect negative synchronizing signal b rising edge b_POS after, waveform RX put low level " 0 " and keep, returned for the 1. step, otherwise, continue to detect.
This shows the Waveform regulating method of a kind of Manchester code provided by the invention, a waveform of mid point when the zero passage saltus step that the binary channels transceiver can be produced depart from, a Manchester code type of mid point when being converted to the zero passage saltus step and being in.
Claims (1)
1. the Waveform regulating method of a Manchester code is characterized in that comprising the steps:
In the 1. step, positive signal and negative signal that the Manchester code of sampling respectively produces through the binary channels transceiver detect the hopping edge of positive signal and negative signal; Set positive synchronizing signal a, the time that positive synchronizing signal a lags behind positive signal is t1, sets negative synchronizing signal b, and the time that negative synchronizing signal b lags behind negative signal is t1, t1＞tRG, tRG are that Manchester code is through the positive signal pulse of binary channels transceiver generation and the blanking time of negative signal pulse;
The 2. step, detect the positive signal trailing edge to the t2 that delays time between the negative signal rising edge, compare with tRG, come monitoring message whether to finish, pilot signal CHECK is set with this, if t2＞tRG, the then end of message, pilot signal CHECK puts high level " 1 " and entered for the 3. step, if t2＜tRG, then message does not finish, and pilot signal CHECK puts low level " 0 " and entered for the 4. step;
The 3. step, detect the positive signal trailing edge after, waveform put low level " 0 " and keep, returned for the 1. step, otherwise, continue to detect;
The 4. step, detect positive synchronizing signal a rising edge after, waveform put high level " 1 " and keep, detect negative synchronizing signal b rising edge after, waveform put low level " 0 " and keep, returned for the 1. step, otherwise, continue to detect.
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| CN201010104149A CN101795137A (en) | 2010-01-26 | 2010-01-26 | Method for adjusting wave form of Manchester code |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108512552A (en) * | 2018-06-15 | 2018-09-07 | 珠海市微半导体有限公司 | A kind of the decoding system and coding/decoding method of Manchester code |
| CN109327282A (en) * | 2018-10-17 | 2019-02-12 | 广东中成卫星微电子发展有限公司 | A kind of Manchester reception coding/decoding method and its circuit delimited based on position |
| CN109756303A (en) * | 2019-03-04 | 2019-05-14 | 北方天穹信息技术（西安）有限公司 | A kind of asynchronous Manchester code reception coding/decoding method of either simplex |
-
2010
- 2010-01-26 CN CN201010104149A patent/CN101795137A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108512552A (en) * | 2018-06-15 | 2018-09-07 | 珠海市微半导体有限公司 | A kind of the decoding system and coding/decoding method of Manchester code |
| CN109327282A (en) * | 2018-10-17 | 2019-02-12 | 广东中成卫星微电子发展有限公司 | A kind of Manchester reception coding/decoding method and its circuit delimited based on position |
| CN109756303A (en) * | 2019-03-04 | 2019-05-14 | 北方天穹信息技术（西安）有限公司 | A kind of asynchronous Manchester code reception coding/decoding method of either simplex |
| CN109756303B (en) * | 2019-03-04 | 2021-07-06 | 北方天穹信息技术（西安）有限公司 | Simplex asynchronous Manchester code receiving and decoding method |
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Application publication date: 20100804 |