CN102164024A - Serial bus data transmission method and device - Google Patents
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Abstract
The invention provides a serial bus data transmission method and device, which relate to the field of communications, and solve the problem that the crosstalk influences the data transmission. The method comprises the following steps: allocating a quadrant value and a bit offset value for each serial channel in a plurality of serial channels, wherein a plurality of serial channels corresponding to a same quadrant value constitute a quadrant, and the bit offset values of different serial channels with a same quadrant value are different; carrying out bit coding according to the quadrant value and bit offset value of each serial channel, and matching each serial channel to a corresponding physical link, wherein adjacent serial channels are matched to non-adjacent physical links; and carrying out data transmission by the serial channels subjected to matching. The technical scheme provided by the invention is applicable to realizing the low-crosstalk data transmission in the process of data transmission performed by a plurality of parallelly-running serial channels.
Description
Technical field
The present invention relates to the communications field, relate in particular to a kind of serial bus data transmission method and device.
Background technology
Along with the develop rapidly of computer science and technology, bus bandwidth becomes one of important indicator of weighing systematic function.According to the difference of data transmittal and routing form, bus is divided into two kinds: universal serial bus and parallel bus.Parallel bus be meant data everybody transmit simultaneously, very high to the requirement that data are synchronous, also become one of bottleneck that restriction parallel bus bandwidth promotes.After transmission speed reached the limit of, parallel bus holding wire length can't prolong, and signal Synchronization is difficult to keep, and the shortcoming that the holding wire power consumption is bigger also displays.This moment, universal serial bus was assigned to the bus form that transmits on the high-speed serial channel as a kind of data, its high-frequency, and the easily synchronous advantage of high bandwidth, data begins to highlight, and is used widely.
When a plurality of serial-ports are worked simultaneously, inevitably brought cross-interference issue between the passage, thereby caused the delay of passage to increase, signal integrity reduces, noise increase or the like problem has influenced transfer of data, becomes a great problem of restriction universal serial bus development.
Summary of the invention
The invention provides a kind of serial bus data transmission method and device, solved the problem of cross talk effects transfer of data.
A kind of serial bus data transmission method comprises:
For each serial-port in a plurality of serial-ports distributes quadrature and the biased value that moves, a plurality of serial-ports of same quadrature correspondence constitute quadrant, the biased value difference of moving of the different serial-ports that quadrature is identical;
According to the quadrature and the biased value that moves of each serial-port, carry out the position coding, each serial-port is matched corresponding physical link, adjacent serial-port is matched to non-conterminous physical link;
By the transmission of the serial-port after coupling data.
Preferably, the serial-port quantity that comprises of all quadrants is identical.
Preferably, when having 20 serial-ports, these 20 serial-ports are divided into 4 quadrants, the quadrature of all quadrants is respectively 0,1,2 and 3, and the biased value that moves of 5 serial-ports in each quadrant is respectively 0,1,2,3 and 4.
Preferably, the described position coding that carries out matches corresponding physical link with each serial-port and is specially:
When the quadrature of serial-port less than 2 the time, determine this serial-port corresponding physical link number according to following expression:
Physical link numbering N=(largest serial port number/4 that system supported) * (1+ quadrature)-biased value-1 that moves;
When the quadrature of serial-port more than or equal to 2 the time, determine this serial-port corresponding physical link number according to following expression:
Physical link numbering N=(largest serial port number/4 that system supported) * (5+ quadrature)+biased value that moves.
Preferably, describedly be specially by the serial-port transmission data after the coupling:
Data frame dividing waiting for transmission is become data block, be each data block numbering;
Intersect to send data block that is numbered odd number and the data block that is numbered even number, everybody of described data block intersected to be evenly distributed on each serial-port transmit, the figure place of described data block equals the serial-port number.
Preferably, method also comprises:
When one or more serial-ports occur adjusting the data block size according to the serial-port quantity of current operate as normal can not reparation property mistake the time.
The present invention also provides a kind of universal serial bus data transmission device, comprising:
Quadrant is divided module, is used to each serial-port in a plurality of serial-ports to distribute quadrature and the biased value that moves, and a plurality of serial-ports of same quadrature correspondence constitute quadrant, the biased value difference of moving of the different serial-ports that quadrature is identical;
The physical link matching module is used for quadrature and the biased value that moves according to each serial-port, and carries out the position coding, and each serial-port is matched corresponding physical link, and adjacent serial-port is matched to non-conterminous physical link;
Data transmission module is used for by the transmission of the serial-port after coupling data.
Preferably, described data transmission module comprises:
The data block division unit is used for data frame dividing waiting for transmission is become data block, is each data block numbering;
The data block transmitting element is used to intersect and sends data block that is numbered odd number and the data block that is numbered even number, everybody of described data block is intersected to be evenly distributed on each serial-port transmit, and the figure place of described data block equals the serial-port number.
Preferably, described data block division unit also is used for occurring adjusting the data block size according to the serial-port quantity of current operate as normal can not reparation property mistake the time when one or more serial-ports.
The invention provides a kind of serial bus data transmission method and device, for each serial-port in a plurality of serial-ports distributes quadrature and the biased value that moves, a plurality of serial-ports of same quadrature correspondence constitute quadrant, the biased value difference of moving of the different serial-ports that quadrature is identical, quadrature and the biased value that moves according to each serial-port, carry out the position coding, each serial-port is matched corresponding physical link, adjacent serial-port is matched to non-conterminous physical link, by the transmission of the serial-port after coupling data, the adjacent string row of channels is matched to different physical links, reduce crosstalking between adjacent physical link, solved the problem of cross talk effects transfer of data.
Description of drawings
The flow chart of a kind of serial bus data transmission method that Fig. 1 provides for embodiments of the invention one;
Fig. 2 is an employed position mixed mode schematic diagram in the embodiments of the invention three;
Fig. 3 is the schematic diagram of serial-port and physical channel matching relationship;
Fig. 4 is an odd-even interleaving selection strategy schematic diagram;
The structural representation of a kind of universal serial bus data transmission device that Fig. 5 provides for embodiments of the invention four;
Fig. 6 is the structural representation of data transmission module 503 among Fig. 5.
Embodiment
When a plurality of serial-ports are worked simultaneously, inevitably bring cross-interference issue between the passage, thereby caused the delay of passage to increase, signal integrity reduces, and noise increase or the like problem becomes a great problem that the restriction universal serial bus develops.Moreover, need take a kind of method of calibration to come the data of transmitting on the high-speed serial channel are carried out debug and correction because serial-port adopts the high speed transmission of signals data.But all there is the maximum magnitude of the data that can detect in various verification modes, and surpass this scope and then can't detect mistake on the passage.Therefore when certain passage on the universal serial bus occurred paroxysmal and length above verification maximum magnitude wrong, data check was powerless.
Address the above problem as need, except from pcb board level circuit design aspect is considered, if can be from the source of high speed serialization interconnection, be chip design and go here and there translate phase and take a kind of method, reduce degree of crosstalk between high-speed serial channel, reduce the risk that occurs continuous unexpected error on the passage, will improve the operating efficiency and the fault-tolerance of universal serial bus greatly, thereby bring the raising on the data transfer bandwidth and the lifting of systematic function.
In order to address the above problem, embodiments of the invention provide a kind of serial bus data transmission method and device, hereinafter will be elaborated to embodiments of the invention in conjunction with the accompanying drawings.Need to prove that under the situation of not conflicting, embodiment among the application and the feature among the embodiment be combination in any mutually.
At first in conjunction with the accompanying drawings, embodiments of the invention one are described.
The embodiment of the invention one provides a kind of serial bus data transmission method, uses flow process that this method finishes transfer of data as shown in Figure 1, comprising:
Wherein, described serial-port is a logical channel.
Below, embodiments of the invention two are described.
The embodiment of the invention provides a kind of serial bus data transmission method, the main influence of considering the high-speed serial channel cross-interference issue to the universal serial bus transmission quality, abandoned the design one to one of traditional serial-port and physical link coupling, Mathematical Modeling by plate level wiring delay, calculate the optimum bit mixed mode from the serial-port to the physical link, thereby alleviate degree of crosstalk.Wherein the core of computing relay model be to analyze and calculate interconnected in the arrival and change-over time of capacitive coupling arbitrfary point, this process can adopt simulation tool such as HSpice to calculate.In delay model computational process, the calculating of retardation and transfer point is a process that iterates, this process with time of advent of first input and change-over time are benchmark to start with, is that unit upgrade to interconnected delay and change-over time with the time equal segments by iteration, repeats this process and is reduced to below 5% up to the delay sum change degree of all passages between twice iteration.The optimum bit mixed mode need satisfy following characteristic: (1) all possible syntople is double.The every group of differential signal of ascending the throne under the mixed mode is identical to the length of other signals.(2) distance of two adjacent groups physical link is identical arbitrarily.
The 8 bit cyclic redundancy modes that traditional high speed interconnection is adopted have following characteristics: (1) can detect any mistake below 3 and 3.(2) can detect the mistake that any number of errors is an odd number.(3) sudden continuous length is 8 bits or the following mistake of 8 bits arbitrarily.(4) when the continuity incorrect length is 9 bits, there is 1/128 probability mistake to survey.(5), there is 1/256 probability mistake to survey when continuity incorrect length during greater than 9 bits.Therefore when certain high-speed serial channel appearance of bus continuous can not mis repair the time, be that sudden continuous incorrect length is during more than or equal to 9 bits, cyclic redundancy check (CRC) has the risk of inefficacy, and the information of leading to errors is sent to application level, brings more serious system mistake.In order to prevent the appearance of this situation, the embodiment of the invention has adopted a kind of parity block intersection selection strategy, and data frame dividing is become the littler piece of length, intersects to be evenly distributed on each high-speed serial channel.The recipient receives after the data and to carry out cyclic redundancy check (CRC) again according to the form of this strategy with the synthetic Frame of data chunk.When the continuity mistake that occurs on certain passage repairing, this strategy reconfigures the data on the passage, intersect with the data on other passages, but the ill-formalness that has guaranteed verification phase data frame is the sniffing mistake of discontinuity, rather than has the above continuity mistake of 8 bits that can not survey risk.Adopt the successful verification of above-mentioned strategy go out on the passage can not mis repair after, bus is transmitted width and is consulted again, promptly abandon disabled high-speed serial channel, transmit with the high-speed serial channel number that receiving-transmitting sides is decided through consultation again, this moment, the parity block Crossover Strategy changed according to highway width (passage number), guaranteed the measurability that Frame makes a mistake.
The serial bus data transmission method that the embodiment of the invention provides, improved the high speed transmission of signals quality, be meant that mainly chip design stage adopts the position mixed method according to best mixed mode serial-port to be corresponded to physical link, reduced each interchannel because the interconnected delay and the noise of crosstalking and bringing improves signal integrity; Strengthened the fault-tolerance of system, mainly be meant the application of parity block intersection selection strategy, the risk of can not surveying of the mistake that appearance mistake on the serial-port is brought is reduced to minimum.Under the prerequisite that mistake can be surveyed, consult the transmission width according to the transmission situation of passage, even physical fault appears in some passage, corresponding countermeasure is arranged also, promptly according to each data block of port number cross-assignment again, bus still can continue operate as normal.
Below in conjunction with accompanying drawing, embodiments of the invention three are described.
Describe the position in the embodiment of the invention respectively and mixed the implementation procedure of mating physical link and parity block intersection selection transmission data.
In the embodiment of the invention, optimum bit mixed mode according to delay model and emulation tool calculate as shown in Figure 2, corresponds to the data on the serial-port on the physical link, data format on the serial-port is continuous in Frame simultaneously, carries out the position coding according to quadrant and skew.With 20 serial-ports is example, and the high-speed interconnect bus is divided into 4 quadrants, and each quadrant accounts for 5 side-play amounts, and physical link then directly corresponds to the cabling of connectivity port between the chip on the printed circuit board.The position mixed mode mates serial-port and physical link by direct corresponding relation, does not need to increase extra logic.Each of serial-port is by＜quadrant, skew＞form be described, physical link then is described by putting in order of 1-20, wherein, the coupling rule of being derived by the optimum bit mixed mode is as follows:
When the quadrature of serial-port less than 2 the time, determine this serial-port corresponding physical link number according to following expression:
Physical link numbering N=(largest serial port number/4 that system supported) * (1+ quadrature)-biased value-1 that moves;
When the quadrature of serial-port more than or equal to 2 the time, determine this serial-port corresponding physical link number according to following expression:
Physical link numbering N=(largest serial port number/4 that system supported) * (5+ quadrature)+biased value that moves.
As shown in Figure 3, transmit leg calculates putting in order of physical link according to above-mentioned rule, and serial-port is corresponded to the physical channel.Simultaneously, the recipient releases putting in order of serial-port according to above-mentioned rule is counter, and physical link is corresponded to serial-port.
As shown in Figure 4, with parallel data frame data length is that 80 bits are the odd-even interleaving selection strategy that example is described the high speed interconnection: Frame is divided into 4 data blocks by section, and size is 20 bits, is numbered 0,1,2,3, wherein 0,2 is even piece, 1,3 is strange piece, and position adjacent in each data block is adjacent relation equally in Frame.When serial-port that system supported adds up to 20, data block length and serial-port equal in length, strange piece and even piece intersect and take serial-port, and each clock cycle all has a data block to be issued, and sends complete Frame 4 clock cycle of needs.Data block corresponds on the passage according to the position mixed mode, and position adjacent in the data block has been assigned on the different physical channels, causes the immesurable situation of Frame mistake thereby avoided occurring on the single physical passage continuous mistake.Occur can not reparation property mistake when one or more passages, and both sides consult to transmit width again.When serial-port that system supported add up to 10, clock cycle data length that can transmit was half of data block length.Odd-even interleaving this moment strategy changes adjacent data block intersection into and sends, adjacent position also intersects transmission in each data block, send the odd bits of odd number piece as first cycle, second period sends the odd bits of even numbered blocks, the 3rd cycle sends the even bit of odd number piece, the 4th cycle sends the even bit of even numbered blocks, sends up to all data blocks to finish, and carries out the intersection of next Frame again and selects.When serial-port that system supported add up to 5, the data length that clock cycle can transmit was 1/4th of a data block length.This moment, the odd-even interleaving strategy was made corresponding variation once more, and adjacent data block is intersected transmissions, and the data bit within per 4 of each data block is also intersected transmission, as the 0th of first cycle transmission odd number piece, 4,8,12,16, second period sends the 0th, 4,8 of even numbered blocks, 12,16, the 3rd cycle sends 1 of odd number piece, 5,9,13,17, continue this process and finish up to all data blocks transmissions, carry out the intersection of next Frame again and select.
Below in conjunction with accompanying drawing, embodiments of the invention five are described.
The embodiment of the invention provides a kind of universal serial bus data transmission device, and its structure comprises as shown in Figure 5:
Quadrant is divided module 501, is used to each serial-port in a plurality of serial-ports to distribute quadrature and the biased value that moves, and a plurality of serial-ports of same quadrature correspondence constitute quadrant, the biased value difference of moving of the different serial-ports that quadrature is identical;
Physical link matching module 502 is used for quadrature and the biased value that moves according to each serial-port, and carries out the position coding, and each serial-port is matched corresponding physical link, and adjacent serial-port is matched to non-conterminous physical link;
Preferably, the structure of described data transmission module 503 comprises as shown in Figure 6:
Data block division unit 5031 is used for data frame dividing waiting for transmission is become data block, is each data block numbering;
Data block transmitting element 5032 is used to intersect and sends data block that is numbered odd number and the data block that is numbered even number, everybody of described data block is intersected to be evenly distributed on each serial-port transmit, and the figure place of described data block equals the serial-port number.
Preferably, described data block division unit 5031 also is used for occurring adjusting the data block size according to the serial-port quantity of current operate as normal can not reparation property mistake the time when one or more serial-ports.
A kind of universal serial bus data transmission device that the embodiment of the invention provides, can combine with a kind of serial bus data transmission method that embodiments of the invention provide, for each serial-port in a plurality of serial-ports distributes quadrature and the biased value that moves, a plurality of serial-ports of same quadrature correspondence constitute quadrant, the biased value difference of moving of the different serial-ports that quadrature is identical, quadrature and the biased value that moves according to each serial-port, carry out the position coding, each serial-port is matched corresponding physical link, adjacent serial-port is matched to non-conterminous physical link, by the transmission of the serial-port after coupling data, the adjacent string row of channels is matched to different physical links, reduce crosstalking between adjacent physical link, solved the problem of cross talk effects transfer of data.
The all or part of step that the one of ordinary skill in the art will appreciate that the foregoing description program circuit that can use a computer is realized, described computer program can be stored in the computer-readable recording medium, described computer program (as system, unit, device etc.) on the relevant hardware platform is carried out, when carrying out, comprise one of step or its combination of method embodiment.
Alternatively, all or part of step of the foregoing description also can use integrated circuit to realize, these steps can be made into integrated circuit modules one by one respectively, perhaps a plurality of modules in them or step is made into the single integrated circuit module and realizes.Like this, the present invention is not restricted to any specific hardware and software combination.
Each device/functional module/functional unit in the foregoing description can adopt the general calculation device to realize, they can concentrate on the single calculation element, also can be distributed on the network that a plurality of calculation element forms.
Each device/functional module/functional unit in the foregoing description is realized with the form of software function module and during as independently production marketing or use, can be stored in the computer read/write memory medium.The above-mentioned computer read/write memory medium of mentioning can be a read-only memory, disk or CD etc.
Anyly be familiar with those skilled in the art in the technical scope that the present invention discloses, can expect easily changing or replacing, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the described protection range of claim.
Claims (9)
1. a serial bus data transmission method is characterized in that, comprising:
For each serial-port in a plurality of serial-ports distributes quadrature and the biased value that moves, a plurality of serial-ports of same quadrature correspondence constitute quadrant, the biased value difference of moving of the different serial-ports that quadrature is identical;
According to the quadrature and the biased value that moves of each serial-port, carry out the position coding, each serial-port is matched corresponding physical link, adjacent serial-port is matched to non-conterminous physical link;
By the transmission of the serial-port after coupling data.
2. serial bus data transmission method according to claim 1 is characterized in that, the serial-port quantity that all quadrants comprises is identical.
3. serial bus data transmission method according to claim 1 and 2, it is characterized in that, when having 20 serial-ports, these 20 serial-ports are divided into 4 quadrants, the quadrature of all quadrants is respectively 0,1,2 and 3, and the biased value that moves of 5 serial-ports in each quadrant is respectively 0,1,2,3 and 4.
4. serial bus data transmission method according to claim 1 is characterized in that, the described position coding that carries out matches corresponding physical link with each serial-port and is specially:
When the quadrature of serial-port less than 2 the time, determine this serial-port corresponding physical link number according to following expression:
Physical link numbering N=(largest serial port number/4 that system supported) * (1+ quadrature)-biased value-1 that moves;
When the quadrature of serial-port more than or equal to 2 the time, determine this serial-port corresponding physical link number according to following expression:
Physical link numbering N=(largest serial port number/4 that system supported) * (5+ quadrature)+biased value that moves.
5. serial bus data transmission method according to claim 1 is characterized in that, describedly is specially by the serial-port transmission data after the coupling:
Data frame dividing waiting for transmission is become data block, be each data block numbering;
Intersect to send data block that is numbered odd number and the data block that is numbered even number, everybody of described data block intersected to be evenly distributed on each serial-port transmit, the figure place of described data block equals the serial-port number.
6. serial bus data transmission method according to claim 5 is characterized in that, this method also comprises:
When one or more serial-ports occur adjusting the data block size according to the serial-port quantity of current operate as normal can not reparation property mistake the time.
7. a universal serial bus data transmission device is characterized in that, comprising:
Quadrant is divided module, is used to each serial-port in a plurality of serial-ports to distribute quadrature and the biased value that moves, and a plurality of serial-ports of same quadrature correspondence constitute quadrant, the biased value difference of moving of the different serial-ports that quadrature is identical;
The physical link matching module is used for quadrature and the biased value that moves according to each serial-port, and carries out the position coding, and each serial-port is matched corresponding physical link, and adjacent serial-port is matched to non-conterminous physical link;
Data transmission module is used for by the transmission of the serial-port after coupling data.
8. universal serial bus data transmission device according to claim 7 is characterized in that, described data transmission module comprises:
The data block division unit is used for data frame dividing waiting for transmission is become data block, is each data block numbering;
The data block transmitting element is used to intersect and sends data block that is numbered odd number and the data block that is numbered even number, everybody of described data block is intersected to be evenly distributed on each serial-port transmit, and the figure place of described data block equals the serial-port number.
9. universal serial bus data transmission device according to claim 8 is characterized in that,
Described data block division unit also is used for occurring adjusting the data block size according to the serial-port quantity of current operate as normal can not reparation property mistake the time when one or more serial-ports.
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| WO2015006983A1 (en) * | 2013-07-19 | 2015-01-22 | 华为技术有限公司 | Method and apparatus for reducing crosstalk cost |
| CN109710552A (en) * | 2018-12-29 | 2019-05-03 | 深圳市联影医疗数据服务有限公司 | Bus transfer method for evaluating quality, system and computer storage medium |
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| CN101150555A (en) * | 2006-09-22 | 2008-03-26 | 华为技术有限公司 | Coding method and device and decoding method and device |
| CN101442354A (en) * | 2007-11-21 | 2009-05-27 | 中兴通讯股份有限公司 | Transmission and receive method, transmitter and receiver |
| CN101778389A (en) * | 2010-01-29 | 2010-07-14 | 华为技术有限公司 | Multi-system type data processing method and device |
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| CN101150555A (en) * | 2006-09-22 | 2008-03-26 | 华为技术有限公司 | Coding method and device and decoding method and device |
| CN101442354A (en) * | 2007-11-21 | 2009-05-27 | 中兴通讯股份有限公司 | Transmission and receive method, transmitter and receiver |
| CN101778389A (en) * | 2010-01-29 | 2010-07-14 | 华为技术有限公司 | Multi-system type data processing method and device |
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