WO2011161153A1 - Verfahren und vorrichtung zur datenübertragung mit variabler bitlänge - Google Patents
Verfahren und vorrichtung zur datenübertragung mit variabler bitlänge Download PDFInfo
- Publication number
- WO2011161153A1 WO2011161153A1 PCT/EP2011/060435 EP2011060435W WO2011161153A1 WO 2011161153 A1 WO2011161153 A1 WO 2011161153A1 EP 2011060435 W EP2011060435 W EP 2011060435W WO 2011161153 A1 WO2011161153 A1 WO 2011161153A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- bit length
- bus
- data frame
- data
- identifier
- Prior art date
Links
Classifications
-
- 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
-
- 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
- G06F13/14—Handling requests for interconnection or transfer
- G06F13/36—Handling requests for interconnection or transfer for access to common bus or bus system
- G06F13/362—Handling requests for interconnection or transfer for access to common bus or bus system with centralised access control
- G06F13/364—Handling requests for interconnection or transfer for access to common bus or bus system with centralised access control using independent requests or grants, e.g. using separated request and grant lines
-
- 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
- G06F13/4291—Bus transfer protocol, e.g. handshake; Synchronisation on a serial bus, e.g. I2C bus, SPI bus using a clocked protocol
Definitions
- the invention relates to a device, a method and an interface for the transmission of data between at least two participants of a CAN bus system, wherein the time duration of the transmitted bits within a data frame can assume at least two different values.
- Media access control is based on bitwise arbitration.
- bitwise arbitration several subscriber stations can simultaneously transmit data over the channel of the bus system, without thereby the
- bitwise arbitration is usually done in an arbitration field within a channel to be transmitted over the channel
- Arbitration field has completely sent to the channel, she knows that has exclusive access to the channel.
- the end of the transmission of the arbitration field corresponds to a beginning of a release interval within which the subscriber station can exclusively use the channel.
- Protocol specification of the CAN may not be allowed by other subscriber stations accessing the channel, that is, sending data to the channel until the transmitting subscriber station has transmitted a checksum field (CRC field) of the data frame.
- CRC field checksum field
- an end time of transmission of the CRC field corresponds to an end of the enable interval.
- bitwise arbitration achieves non-destructive transmission of the data frame via the channel. This results in good
- Station transmitted further data frame during transmission over the channel can be destroyed, have a significantly less favorable real-time behavior, since it comes to a delay of the data transmission due to the collision and thus required new transmission of the data frame.
- the protocols of the CAN or its extension TTCAN are particularly suitable for transmitting short messages under real-time conditions. However, if larger data blocks are to be transmitted over a CAN domain, then the relatively low bit rate of the channel becomes a limiting factor. To ensure the correct function of the bitwise arbitration, must for the
- DE 101 53 085 A1 proposes to temporarily transfer the communication interface for transferring the data block to another
- the object of the invention is to provide a method and to describe a device and an interface, by which larger amounts of data can be transmitted relatively quickly in a CAN network and
- the described object is achieved according to the invention in that for a limited time, in particular after arbitration within a data frame, the bit length, that is to say the duration of the bits, is reduced compared to the value used for the arbitration.
- the clock rate can in principle also assume several different elevated values and the times for switching between these values can be within the data frame as desired.
- the clock rate could take any course, provided that the bus participants with this course have a common understanding and so can interpret the information contained in the data frame uniformly.
- a data frame in at least one subregion has an altered bit length according to the invention must be communicated to the recipient so that the latter can correctly interpret the transmitted data.
- the message to the recipient is provided via a label. In this case, it may be advantageous, depending on the identifier for the bit length and the
- Times of change of bit length stored values to use An example for this would be an identification by a fixed, still free bit within the header area of the data frame, whereby for one of the two possible values of this bit, for example in the complete data field, a bit length reduced by one factor set for all bus subscribers is used.
- Another possibility is to transmit information regarding the bit length and / or the time of the bit length change to the receiver within the tag or at another specified location within the data frame.
- a reduction factor or divisor for the bit length could be transmitted as an integer in the first three bits of the data field, and the multiplied by the factor bit length be applied after a fixed switching time for the remaining duration of the data field.
- the identification is sent in a previous data frame and in this way at least one bus user pointed out that a subsequent, directed to him data frame will have a reduced bit length.
- At least the SOF bit and the arbitration field of the data frame have a bit length which corresponds to the base clock rate of the bus.
- the reduction of the bit length can be carried out selectively only at the transmitter and receiver of the currently transmitted data frame and energy can be saved, which would be necessary to carry out the corresponding increase of the sampling frequency for all bus subscribers.
- the other bus users who do not switch their bit length can then temporarily not participate in the communication.
- the devices which carry out the method according to the invention both in bus systems whose subscribers consistently comply with a bit length corresponding to the basic clock rate and in bus systems whose subscribers can work with bit length reduced according to the invention, it is further advantageous to use the devices, for example to make switchable by a suitable input.
- the devices operating according to the invention can then be used flexibly in old and new networks. To avoid the bits transmitted with reduced bit length at
- a bus system as bus subscribers could have full nodes and Eco nodes, wherein the filling nodes are set up by suitable means, such as higher-order oscillators, to switch the bit length, while the Eco nodes can only use the usual bit length. Sends a fill If a node has a shorter bit length, the Eco nodes, for example, stop communicating from the last long bit and no longer perform bit resynchronization. It is possible to suspend the
- the eco-nodes resume communication when they observe a recessive bus state for a predetermined time, for example for ten slow bit lengths, which corresponds to an end-of-frame with three consecutive intermission bits.
- Figure 1 shows a CAN bus system of the prior art with several
- Figure 2a shows schematically the structure of a data frame according to the CAN standard ISO 11898-1.
- Figure 2b shows schematically the structure of a data frame with the
- Figure 3 illustrates an example of the timing of the tag, by which the receiver is informed the necessary information about the change of the bit length, within the data frame.
- FIGS. 4a and 4b show different possibilities for the distribution of the necessary information about the change of the bit length between
- FIG. 1 shows a prior art CAN bus 100 with a plurality of subscribers 110, 120, 130, 140, as shown in FIG. Between the participants, data frames are exchanged according to the CAN standard ISO 11898-1.
- the bus has a clock rate of 500 kBaud, which means that the bit length is 2 is in this example.
- FIG. 2 a shows the schematic structure of a data frame 200 that can be transmitted via the bus 100.
- the data frame can in principle be placed in a header area 201 (usually consisting of the fields "Start of Frame", “Arbitration Field” and “Control Field”), as well as a data field 202 and an end area 203 (usually consisting of CRC field, ACK field). Divide field and "End of Frame”.
- a header area 201 usually consisting of the fields "Start of Frame", "Arbitration Field” and "Control Field
- a data field 202 and an end area 203 usually consisting of CRC field, ACK field.
- Divide field and "End of Frame” is constant for the entire data frame.
- FIG. 2b shows by way of example the structure deviating from the invention of a data frame 210 consisting of header area 211, data field 212 and
- FIG. 3 again shows the structure of a data frame 210 according to the invention.
- the position of the marking 310 according to the invention is shown as an example within the header area of the data frame. In the embodiment shown here, one or more bits within the
- Header area can be used for labeling.
- a reserved bit could be used as an indication of the bit length reduced by a factor of four.
- the designated times t1 and t2 would be the start and end of the reserved bit
- the times t3 and t4 would correspond to the start and end of the bit length switching as before.
- a special case of the marking according to the invention is the possibility of determining the reduced bit length used for the transmission as a function of the identifier of the data frame in the context of the definition of the CAN matrix. If, in this determination, the potential transmitters and receivers of the respective data frame are known, it is also known whether all transmitters and receivers for a message with a given identifier are set up to use the reduced bit length, that is to say so-called "fill nodes", or whether they are not set up, that is, they are "eco-nodes”. Depending on this, it may then be stipulated that data frames with particular identifiers or from a group of identifiers, in particular those which only exist between full
- Nodes are exchanged, using a reduced bit length in a specified area. This is then communicated to the respective recipients only by the identifier itself.
- Another, but not further developed option is the
- Label 310 to send in a previous data frame and in this way at least one bus user to point out that a subsequent, directed to him data frame will have a reduced bit length.
- the tag need not be sent in every data frame according to the invention, but only once or sporadically.
- FIGS. 4a and 4b are concerned with the information content of
- Labelling it is possible for various types of data frame, the information about the respective course of the bit length within the data frame in the bus subscribers to deposit and only to transmit a type information as part of the labeling. Alternatively, parameters which describe the reduction of the bit length can also be sent with the identification. In the illustrated case, there are only two types of data frames and only one bit of data frame 210 is used as tag 310 to distinguish between type A (eg standard bitmap data frame as per FIG. 2a) and type B (eg data frame) with a shortened by a factor of 4 bit length in the data field as Figure 2b).
- type A eg standard bitmap data frame as per FIG. 2a
- type B eg data frame
- the eco-bus users 405 and 406 transmitting and / or receiving type A data frames know the standard bit length LI.
- Full Bus subscribers 410 and 420 transmitting and / or receiving Type B data frames know the two values of occurring bit lengths LI and L2, the position of the tag [t1, t2], and the start and end times of the reduced bit length range t3 and t4 adjust their transmission and reception behavior in a suitable manner
- the eco-participants 405 and 406 additionally know the position of the identification [t1, t2]. The im
- Participants are pronounced and set their transmission and reception behavior to a shortened bit length.
- FIG. 4b Another possibility is shown in FIG. 4b.
- parts of the information about the change of the bit length, in particular the factor F, by which the bus rate is increased or the bit length is to be reduced are transmitted.
- Data field eight different factors F are transmitted and at a defined time after receipt of the 5 factor, for example, the fourth or fifth bit of the data field, the
- the method may be in the illustrated by the figures 4a and 4b
- Fill nodes have for carrying out the method, for example one
- the resynchronization can be switched off in order to avoid erroneous resynchronization on edges of the bus signal, which are transmitted by the
- the inventive Identification of the data frames are used, ie the eco-bus subscribers would, upon detection of an identifier 310, which signals a data frame of type A with a shortened bit length, the
- Disable resynchronization or communication for this data frame For example, they resume resynchronization or communication when they observe a recessive bus state for a predetermined amount of time, for example for ten slow bit lengths, which corresponds to an end-of-frame with three subsequent intermission bits.
- a type classification of the data frames in the case shown by way of example according to type A or type B) to be defined within the definition of the CAN matrix, for example depending on whether the sender and the receivers of the respective data frame are full nodes or Eco Nodes, and resynchronization is disabled for the type B data frames specified in this path. For this would have the appropriate
- Address lists or filters are provided in the bus participants with the appropriate type information.
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- Theoretical Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Small-Scale Networks (AREA)
- Information Transfer Systems (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/806,556 US9645958B2 (en) | 2010-06-23 | 2011-06-22 | Method and device for transmitting data having a variable bit length |
KR1020137001704A KR101872543B1 (ko) | 2010-06-23 | 2011-06-22 | 가변적인 비트 길이를 가진 데이터를 전송하기 위한 방법 및 장치 |
CN201180040859.XA CN103038757B (zh) | 2010-06-23 | 2011-06-22 | 用于在可变位长度的情况下进行数据传输的方法和设备 |
JP2013515881A JP5486131B2 (ja) | 2010-06-23 | 2011-06-22 | ビット長が可変的なデータ伝送のための方法及び装置 |
EP11728616.1A EP2585935B1 (de) | 2010-06-23 | 2011-06-22 | Verfahren und vorrichtung zur datenübertragung mit variabler bitlänge |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE201010030422 DE102010030422A1 (de) | 2010-06-23 | 2010-06-23 | Verfahren, Vorrichtung und Schnittstelle zur Datenübertragung mit variabler Datenrate |
DE102010030422.0 | 2010-06-23 | ||
DE102011077493A DE102011077493A1 (de) | 2010-06-23 | 2011-06-14 | Verfahren und Vorrichtung zur Datenübertragung mit variabler Bitlänge |
DE102011077493.9 | 2011-06-14 |
Publications (1)
Publication Number | Publication Date |
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WO2011161153A1 true WO2011161153A1 (de) | 2011-12-29 |
Family
ID=44486921
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2011/060435 WO2011161153A1 (de) | 2010-06-23 | 2011-06-22 | Verfahren und vorrichtung zur datenübertragung mit variabler bitlänge |
Country Status (7)
Country | Link |
---|---|
US (1) | US9645958B2 (de) |
EP (1) | EP2585935B1 (de) |
JP (1) | JP5486131B2 (de) |
KR (1) | KR101872543B1 (de) |
CN (1) | CN103038757B (de) |
DE (1) | DE102011077493A1 (de) |
WO (1) | WO2011161153A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2712123A1 (de) * | 2012-09-20 | 2014-03-26 | Robert Bosch Gmbh | Standard CAN Implementierung toleriert CAN FD Rahmen |
Families Citing this family (11)
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RU2620989C2 (ru) * | 2011-04-06 | 2017-05-30 | Роберт Бош Гмбх | Способ и устройство для повышения пропускной способности при передаче данных в последовательной шинной системе |
ES2595155T3 (es) | 2011-04-06 | 2016-12-28 | Robert Bosch Gmbh | Método y dispositivo para adaptar la seguridad de transmisión de datos en un sistema de bus en serie |
RU2597502C2 (ru) | 2011-04-26 | 2016-09-10 | Роберт Бош Гмбх | Способ и устройство для адаптируемой к размерам памяти последовательной передачи данных |
ES2548409T3 (es) | 2011-06-29 | 2015-10-16 | Robert Bosch Gmbh | Método y dispositivo para la transmisión en serie de datos con un tamaño flexible de mensajes y una longitud de bits variable |
US9934171B2 (en) | 2016-02-10 | 2018-04-03 | Qualcomm Incorporated | Serial communication link with optimal transfer latency |
DE102016223673A1 (de) * | 2016-11-29 | 2018-05-30 | Robert Bosch Gmbh | Verfahren und Vorrichtung zum Betreiben eines Sensorsystems, Sensorsystem |
US10496562B1 (en) | 2018-08-13 | 2019-12-03 | Qualcomm Incorporated | Low latency virtual general purpose input/output over I3C |
CN109522262B (zh) * | 2018-10-10 | 2022-12-13 | 上海亚明照明有限公司 | 适用于不定长数据帧的接收方法、系统、电子终端及存储介质 |
CN111352887B (zh) * | 2019-11-19 | 2023-10-17 | 中国航空工业集团公司西安航空计算技术研究所 | 一种pci总线到可配置帧长度串行总线适配和传输方法 |
US20230060218A1 (en) | 2020-02-11 | 2023-03-02 | Ciphersip Systems Ltd. | High bandwidth can-derivative communication |
CN114826814B (zh) * | 2022-04-15 | 2023-09-01 | 湖南恩智测控技术有限公司 | 基于不同通信总线之间的数据传输方法和数据传输设备 |
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- 2011-06-14 DE DE102011077493A patent/DE102011077493A1/de not_active Withdrawn
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- 2011-06-22 JP JP2013515881A patent/JP5486131B2/ja active Active
- 2011-06-22 WO PCT/EP2011/060435 patent/WO2011161153A1/de active Application Filing
- 2011-06-22 EP EP11728616.1A patent/EP2585935B1/de active Active
- 2011-06-22 US US13/806,556 patent/US9645958B2/en active Active
- 2011-06-22 CN CN201180040859.XA patent/CN103038757B/zh active Active
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Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2712123A1 (de) * | 2012-09-20 | 2014-03-26 | Robert Bosch Gmbh | Standard CAN Implementierung toleriert CAN FD Rahmen |
WO2014044658A1 (en) * | 2012-09-20 | 2014-03-27 | Robert Bosch Gmbh | Controller area network with flexible data-rate |
KR20150059740A (ko) * | 2012-09-20 | 2015-06-02 | 로베르트 보쉬 게엠베하 | 신축적 데이터-레이트를 갖는 can |
JP2015536067A (ja) * | 2012-09-20 | 2015-12-17 | ローベルト ボッシュ ゲゼルシャフト ミット ベシュレンクテル ハフツング | 可変的なデータレート対応のコントローラエリアネットワーク |
US9742584B2 (en) | 2012-09-20 | 2017-08-22 | Robert Bosch Gmbh | Controller area network with flexible data-rate |
KR102116930B1 (ko) * | 2012-09-20 | 2020-05-29 | 로베르트 보쉬 게엠베하 | 신축적 데이터-레이트를 갖는 can |
Also Published As
Publication number | Publication date |
---|---|
KR20130089236A (ko) | 2013-08-09 |
EP2585935A1 (de) | 2013-05-01 |
EP2585935B1 (de) | 2014-05-14 |
US20130166800A1 (en) | 2013-06-27 |
CN103038757B (zh) | 2016-08-03 |
DE102011077493A1 (de) | 2012-04-26 |
CN103038757A (zh) | 2013-04-10 |
JP2013531947A (ja) | 2013-08-08 |
KR101872543B1 (ko) | 2018-06-28 |
US9645958B2 (en) | 2017-05-09 |
JP5486131B2 (ja) | 2014-05-07 |
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