EP3821571A1 - Abtastvorrichtung zur detektion eines start-bytes in einem hochfrequenten seriellen datenstrom - Google Patents
Abtastvorrichtung zur detektion eines start-bytes in einem hochfrequenten seriellen datenstromInfo
- Publication number
- EP3821571A1 EP3821571A1 EP18742744.8A EP18742744A EP3821571A1 EP 3821571 A1 EP3821571 A1 EP 3821571A1 EP 18742744 A EP18742744 A EP 18742744A EP 3821571 A1 EP3821571 A1 EP 3821571A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- data stream
- clock signal
- detection unit
- scanning device
- frequency
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 238000005070 sampling Methods 0.000 title abstract description 4
- 238000001514 detection method Methods 0.000 claims abstract description 54
- 230000001360 synchronised effect Effects 0.000 claims abstract description 5
- 230000005540 biological transmission Effects 0.000 description 5
- 238000011157 data evaluation Methods 0.000 description 3
- 206010004966 Bite Diseases 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000003139 buffering effect Effects 0.000 description 1
- 238000007600 charging Methods 0.000 description 1
- 238000007786 electrostatic charging Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
Classifications
-
- 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
- H04L12/40013—Details regarding a bus controller
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/0079—Receiver details
- H04L7/0087—Preprocessing of received signal for synchronisation, e.g. by code conversion, pulse generation or edge detection
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/14—Two-way operation using the same type of signal, i.e. duplex
- H04L5/1469—Two-way operation using the same type of signal, i.e. duplex using time-sharing
- H04L5/1484—Two-way operation using the same type of signal, i.e. duplex using time-sharing operating bytewise
Definitions
- the invention relates to a scanning device for detecting a start byte in a high-frequency serial data stream, in particular a scanning device for an absolute position measuring device, with a detection unit which is designed to detect the start byte in the data stream and a clock signal generator which is designed to provide the detection unit with a high-frequency clock signal synchronized with the data stream, the clock signal having a higher frequency than the data stream.
- a typical serial data interface for data transmission between the position measuring device and the subsequent electronics is provided by the disclosed BiSS interface, which uses the BiSS line protocol.
- an endless data stream with a high frequency, for example 6.25 MHz, is transmitted between the position measuring device and the subsequent electronics.
- a master generally the subsequent electronics
- continuously sends an idle data stream to a slave generally the position measuring device, in order to avoid electrostatic charging of the interface and to avoid a common mode Ensure data line of the interface.
- the master interrupts the idle data stream and sends a start byte to signal the start of a data transfer. This start byte must be detected by the scanning device of the slave in order to enable an evaluation of the data subsequently transmitted in the data stream.
- a position measuring device with such a scanning device is known for example from DE 10 2014 212 288 A1.
- the scanning device comprises a detection unit and a clock signal generator.
- the scanning device is provided in order to detect a start byte in a high-frequency serial data stream provided by subsequent electronics via a serial data interface.
- the clock signal generator provides the detection unit with a clock signal synchronized with the data stream.
- the detection unit samples the data stream in time with the clock signal in order to detect a start byte in the data stream.
- the scanning device is typically formed by a so-called field programmable gate array (FPGA).
- FPGA field programmable gate array
- An FPGA is an integrated circuit in which logic circuits can be programmed.
- FPGAs allow complex digital circuits to be implemented and the data stream to be scanned very quickly, as is required for start byte detection in the case of high-frequency serial data streams.
- the sampling must be carried out at a significantly higher frequency than the frequency of the data stream in order to enable reliable start byte detection.
- the sampling is often carried out at twice the frequency of the data stream.
- operating temperatures of up to about 115 ° C can occur. In order to enable reliable start byte detection in the scanning device at such high operating temperatures special high temperature FPGAs are required, but they are expensive.
- the high-frequency detection unit of the scanning device is formed by an independent logic detection circuit which excludes addition blocks.
- the detection circuit comprises only temperature-uncritical circuit elements.
- the detection circuit does not have any temperature-sensitive and / or cost-intensive addition blocks as are generally present on FPGA.
- the scanning device according to the invention enables reliable start byte detection even at high temperatures of up to 115 ° C. and can be implemented inexpensively.
- Conventional microcontrollers typically have an integrated clock generator that can generate clock signals with the high clock frequencies required for reliable start byte detection.
- the clock signal generator is therefore preferably formed by a microcontroller, which enables an inexpensive design of the scanning device according to the invention.
- the detection unit is formed by an integrated circuit, whereby the Scanning device can be performed particularly compact and inexpensive.
- the detection unit is advantageously designed to provide a feedback clock signal to the clock signal generator. This enables a particularly exact synchronization between the data stream and the clock signal and thus a particularly reliable start byte detection in the detection unit.
- the detection unit is advantageously designed to provide a feedback clock signal to the clock signal generator. This enables a particularly exact synchronization between the data stream and the clock signal and thus a particularly reliable start byte detection in the detection unit.
- Detection unit on a shift register element with n memory locations and several lookup table elements The shift register element serves as a data buffer in order to buffer the received data stream bits for the start byte detection. Shift register elements shift their memory content by one memory location with each work cycle and are therefore particularly suitable for processing serial data streams. The last received data stream bits are always stored in the shift register element. The number n of storage locations of the shift register element corresponds to the number of bits in the start byte to be detected. Shift register elements have a simple structure and can work reliably at high clock rates even at high temperatures. LUT enable a simple comparison of the data buffered in the shift register element with a bit sequence predetermined by the start byte.
- the LUTs are designed such that they each compare a specific section of the temporarily stored data with a corresponding start byte section.
- the use of several LUTs enables a particularly reliable start byte detection.
- the detection unit with a shift register and a plurality of LUTs enables the scanning device according to the invention to be implemented inexpensively and reliably.
- the lookup table elements are designed such that at most n-1 memory locations of the shift register can be evaluated. Consequently, not all of the data stream bits buffered in the shift register element are compared with the corresponding start byte bits in order to detect a start byte. Some bits are deliberately ignored to create a tolerance for errors in data transmission. This enables reliable start byte detection even in the event of a briefly disturbed data stream transmission.
- FIG. 1 showing a schematic circuit diagram of a scanning device according to the invention
- FIG. 2 shows a schematic circuit diagram of a detection unit of the scanning device from FIG. 1.
- the scanning device 10 can, for example, be used in a position measuring device (not shown in more detail).
- the scanning device 10 is provided with a high-frequency serial data stream D from an external master device 12, for example from subsequent electronics.
- the data stream D is 8bl0b-coded and has a frequency of 6.25 MFIz.
- an endless idle data stream for example with an endless sequence of the bit sequence 0101010101, is transmitted from the master device 12 to the scanning device 10 via the data stream in order to avoid electrical charging of the data line.
- the master device 12 sends a start byte, which in the present exemplary embodiment has the bit sequence 0010111011, in order to send a subsequent data transmission signal. This start byte must be detected by the scanning device 10 in order to signal the beginning of data transmission to a downstream external data evaluation device 14 by providing a trigger signal A.
- the scanning device 10 comprises a detection unit 16, which in the present exemplary embodiment is formed by an independent integrated circuit, and a clock signal generator 18, which is formed in the present exemplary embodiment by a microcontroller.
- the data stream D is provided to the detection unit 16 and the clock signal generator.
- the clock signal generator 18 generates a clock signal TI which is synchronous with the data stream D but is out of phase and is provided to the detection unit 16.
- the clock signal TI has twice the frequency of the data stream D, that is, a frequency of 12.5 MFIz. The higher frequency is required to ensure reliable start byte detection.
- the detection unit 16 samples the data stream D in the work cycle of the clock signal TI, that is to say at a frequency of 12.5 MFIz, in order to detect a start byte in the data stream D. In the case of a start byte detection by the detection unit 16, the trigger signal A of the
- Detection unit 16 is provided to the external data evaluation device 14. Furthermore, the detection unit 16 provides a feedback clock signal T2 with half the frequency of the clock signal TI to the clock signal generator 18 in order to improve the synchronization between the clock signal TI and the data stream D.
- the detection unit 16 is formed by an independent logic detection circuit 19, which in the present exemplary embodiment comprises only one shift register element 20, four lookup table elements 22, 24, 26, 28, an AND gate element 30 and a frequency divider element 32.
- the frequency divider element 32 is provided with the clock signal TI in order to generate the feedback clock signal T2 with half the frequency of the clock signal TI.
- Shift register element 20 includes ten memory locations 20a-20j for buffering received data stream bits.
- the data stream D and the clock signal TI are provided to the shift register element 20.
- Shift register elements 20 have the last ten received data stream bits buffered for each work cycle.
- the first lookup table element 22 evaluates the content of the first two memory locations 20a, 20b of the shift register element 20 and compares them with the first two start byte bits (00). If both storage locations 20a, 20b each contain a logical 0, then the first lookup table element 22 outputs a logical 1.
- the second lookup table element 24 evaluates the content of the last three memory locations 20h-20j of the shift register element 20 and compares this with the last three start byte bits (111). If all three storage locations 20h-20j each contain a logical 1, then the second lookup table element 24 outputs a logical 1.
- the third lookup table element 26 evaluates the content of three middle storage locations 20d-20f of the remaining five storage locations 20c-20g of the shift register element 20 and compares them with the corresponding three start byte bits (011). If storage location 20d contains a logical 0 and storage locations 20e, 20f each contain one contain logical 1, then the third lookup table element 26 outputs a logical 1.
- the fourth lookup table element 28 evaluates the output values of the first three lookup table elements 22, 24, 26 and outputs a logical 1 if at least two of the three output values contain a logical 1.
- the output value of the fourth lookup table element 28 is provided to the AND gate element 30 together with the clock signal TI, so that the output signal A is provided if the output value of the fourth lookup table element 28 contains a logical 1 , Of the ten memory locations 20a-20j, at least five memory locations, ie only half of the memory locations 20a-20j, must consequently correspond to the corresponding start byte section of the start byte to be detected during a start byte detection. This enables fault-tolerant and thus particularly reliable start byte detection.
- the high-frequency detection device in this case comprises only temperature-uncritical elements;
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
- Facsimile Scanning Arrangements (AREA)
Abstract
Description
Claims
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/EP2018/068800 WO2020011347A1 (de) | 2018-07-11 | 2018-07-11 | Abtastvorrichtung zur detektion eines start-bytes in einem hochfrequenten seriellen datenstrom |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3821571A1 true EP3821571A1 (de) | 2021-05-19 |
Family
ID=62952062
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP18742744.8A Withdrawn EP3821571A1 (de) | 2018-07-11 | 2018-07-11 | Abtastvorrichtung zur detektion eines start-bytes in einem hochfrequenten seriellen datenstrom |
Country Status (5)
Country | Link |
---|---|
US (1) | US20210281387A1 (de) |
EP (1) | EP3821571A1 (de) |
JP (1) | JP2021524700A (de) |
CN (1) | CN112385184B (de) |
WO (1) | WO2020011347A1 (de) |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS551735A (en) * | 1978-06-19 | 1980-01-08 | Nec Corp | Synchronism detection circuit |
JPS6115437A (ja) * | 1984-06-30 | 1986-01-23 | Toshiba Corp | シリアルデ−タ受信系のスタ−トビツト検出回路 |
JPH0234056A (ja) * | 1988-07-25 | 1990-02-05 | Toyo Commun Equip Co Ltd | フレーム同期信号の検出方法 |
JPH02202738A (ja) * | 1989-02-01 | 1990-08-10 | Fujitsu Ltd | シリアルデータ受信回路 |
JPH02257730A (ja) * | 1989-03-30 | 1990-10-18 | Sharp Corp | パターン同期回路 |
JPH09116483A (ja) * | 1995-10-16 | 1997-05-02 | Nippon Motorola Ltd | 無線通信システム |
US7656323B2 (en) * | 2007-05-31 | 2010-02-02 | Altera Corporation | Apparatus for all-digital serializer-de-serializer and associated methods |
CN102355382A (zh) * | 2011-09-28 | 2012-02-15 | 东南大学 | 一种控制器局域网总线分析与触发的方法 |
DE102014212288A1 (de) | 2014-06-26 | 2015-12-31 | Dr. Johannes Heidenhain Gmbh | Vorrichtung und Verfahren zum Erzeugen eines Triggersignals in einer Positionsmesseinrichtung und Positionsmesseinrichtung hierzu |
JP6533069B2 (ja) * | 2015-02-19 | 2019-06-19 | 株式会社メガチップス | データ伝送装置並びに送信装置及び受信装置 |
US9614704B2 (en) * | 2015-07-30 | 2017-04-04 | Texas Instruments Incorporated | Methods and apparatus to perform serial communications |
CN105263187A (zh) * | 2015-09-15 | 2016-01-20 | 齐鲁工业大学 | 一种模糊自适应调节无线发射信号强度的方法 |
CN105740087B (zh) * | 2016-02-02 | 2018-07-31 | 北京时代民芯科技有限公司 | 利用查找表移位寄存器进行sram型fpga刷新效果验证的方法 |
-
2018
- 2018-07-11 CN CN201880094712.0A patent/CN112385184B/zh active Active
- 2018-07-11 JP JP2021500522A patent/JP2021524700A/ja active Pending
- 2018-07-11 WO PCT/EP2018/068800 patent/WO2020011347A1/de unknown
- 2018-07-11 US US17/258,450 patent/US20210281387A1/en not_active Abandoned
- 2018-07-11 EP EP18742744.8A patent/EP3821571A1/de not_active Withdrawn
Also Published As
Publication number | Publication date |
---|---|
CN112385184A (zh) | 2021-02-19 |
JP2021524700A (ja) | 2021-09-13 |
WO2020011347A1 (de) | 2020-01-16 |
CN112385184B (zh) | 2022-06-14 |
US20210281387A1 (en) | 2021-09-09 |
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