CN102164024B - 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 refer to data everybody transmitted simultaneously, the requirement synchronous to data is very high, also becomes one of bottleneck that restriction parallel bus bandwidth promotes.After transmission speed reaches the limit of, parallel bus holding wire length can't extend, and the signal synchronism is difficult to keep, and the shortcoming that the holding wire power consumption is larger also displays.Now universal serial bus is assigned to the bus form transmitted on high-speed serial channel as a kind of data, its high-frequency, and high bandwidth, data easily synchronous advantage start to highlight, and are used widely.
When a plurality of serial-ports are worked simultaneously, inevitably brought cross-interference issue between passage, thereby caused the delay of passage to increase, signal integrity reduces, noise increase etc. problem, affected 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 that same quadrature is corresponding form quadrant, the biased value difference of moving of the different serial-ports that quadrature is identical;
According to quadrature and the biased value that moves of each serial-port, carry out the position coding, each serial-port is matched to 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 all quadrants comprises is identical.
Preferably, when having 20 serial-ports, these 20 serial-ports are divided into to 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 by each serial-port and is specially:
When the quadrature of serial-port is less than 2, according to following expression, determine the physical link numbering that this serial-port is corresponding:
Physical link numbering N=(the largest serial port number supported of system/4) * (1+ quadrature)-biased value-1 of moving;
When the quadrature of serial-port is more than or equal to 2, according to following expression, determine the physical link numbering that this serial-port is corresponding:
Physical link numbering N=(the largest serial port number supported of system/4) * (5+ quadrature)+biased value that moves.
Preferably, describedly by the serial-port transmission data after coupling, be specially:
Data frame dividing waiting for transmission is become to data block, is each data block numbering;
Intersect and send the data block that is numbered odd number and the data block that is numbered even number, everybody intersection of described data block is evenly distributed on each serial-port and transmits, the figure place of described data block equals the serial-port number.
Preferably, method also comprises:
When the unrepairable mistake appears in one or more serial-ports, according to the serial-port quantity of current normal operation, adjust the data block size.
The present invention also provides a kind of serial bus data-transmission apparatus, 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 that same quadrature is corresponding form quadrant, the biased value difference of moving of the different serial-ports that quadrature is identical;
The physical link matching module, for the quadrature according to each serial-port and the biased value that moves, carry out the position coding, and each serial-port is matched to corresponding physical link, and adjacent serial-port is matched to non-conterminous physical link;
Data transmission module, for the transmission of the serial-port by after coupling data.
Preferably, described data transmission module comprises:
The data block division unit, for data frame dividing waiting for transmission is become to data block, is each data block numbering;
The data block transmitting element, send the data block that is numbered odd number and the data block that is numbered even number for intersecting, and everybody intersection of described data block is evenly distributed on each serial-port and transmits, and the figure place of described data block equals the serial-port number.
Preferably, described data block division unit, also for when the unrepairable mistake appears in one or more serial-ports, adjust the data block size according to the serial-port quantity of current normal operation.
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 that same quadrature is corresponding form 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 to 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, reduced crosstalking between adjacent physical link, solved the problem of cross talk effects transfer of data.
The accompanying drawing explanation
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 the position mixed mode schematic diagram used in embodiments of the invention three;
The schematic diagram that Fig. 3 is serial-port and physical channel matching relationship;
Fig. 4 is odd-even interleaving selection strategy schematic diagram;
The structural representation of a kind of serial bus data-transmission apparatus that Fig. 5 provides for embodiments of the invention four;
The structural representation that Fig. 6 is data transmission module 503 in Fig. 5.
Embodiment
When a plurality of serial-ports are worked simultaneously, inevitably bring cross-interference issue between passage, thereby caused the delay of passage to increase, signal integrity reduces, and noise increase etc. problem, become a great problem that the restriction universal serial bus develops.Moreover, because serial-port adopts the high speed transmission of signals data, need take a kind of method of calibration to carry out debug and correction to the data of transmitting on high-speed serial channel.But all there is the maximum magnitude of the data that can detect in various verification modes, surpasses this scope and the mistake on passage can't be detected.Therefore, when when universal serial bus on, certain passage occurs paroxysmal and length over verification maximum magnitude wrong, data check is helpless.
As need address the above problem, except from pcb board level circuit design aspect is considered, if can be from the source of high speed serialization interconnection, the parallel-serial conversion stage that is chip design is taked a kind of method, reduce degree of crosstalk between high-speed serial channel, reduce the risk that occurs continuous unexpected error on passage, will improve greatly operating efficiency and the fault-tolerance of universal serial bus, thereby bring raising on 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 in connection with accompanying drawing, embodiments of the invention are elaborated.It should be noted that, in the situation that do not conflict, the embodiment in the application and the feature in embodiment be combination in any mutually.
At first by reference to the accompanying drawings, embodiments of the invention one are described.
The embodiment of the present invention one provides a kind of serial bus data transmission method, and the flow process of using the method to complete transfer of data as shown in Figure 1, comprising:
Wherein, described serial-port is logical channel.
Below, embodiments of the invention two are described.
The embodiment of the present invention provides a kind of serial bus data transmission method, the impact of main consideration high-speed serial channel cross-interference issue on the universal serial bus transmission quality, traditional serial-port and the design one to one of physical link coupling have been abandoned, 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 is arrival and the change-over time of the interconnected middle capacitive coupling of analysis and calculation arbitrfary point, and this process can adopt the simulation tools such as HSpice to be calculated.In delay model computational process, the calculating of retardation and transfer point is a process iterated, this process using time of advent of first input and change-over time as benchmark as beginning, by iteration to interconnected delay with take the time equal segments change-over time as unit is upgraded, repeat this process until between twice iteration the delay sum change degree of all passages be reduced to below 5%.The optimum bit mixed mode need meet following characteristic: (1) all possible syntople is double.The every group of differential signal of ascending the throne under mixed mode is identical to the length of other signals.(2) distance of two groups of physical links of arbitrary neighborhood is identical.
The 8 bit cyclic redundancy modes that traditional high speed interconnection adopts have following characteristics: (1) can detect any mistake below 3 and 3.(2) can detect the mistake that any number of errors is odd number.(3) sudden continuous length is 8 bits or the following mistake of 8 bits arbitrarily.(4), when continuous errors length is 9 bit, there is 1/128 probability mistake to survey.(5), when continuous errors length is greater than 9 bit, there is 1/256 probability mistake to survey.Therefore when continuous unrepairable mistake appears in certain high-speed serial channel of bus, be that sudden continuous incorrect length is while being more than or equal to 9 bit, 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 present invention has adopted a kind of parity block cross selection strategy, and data frame dividing is become to the piece that length is less, intersects and is evenly distributed on each high-speed serial channel.The recipient synthesizes data chunk according to this strategy the form of Frame after receiving data again, carries out cyclic redundancy check (CRC).While the continuous errors of unrepairable occurring on certain passage, this strategy reconfigures the data on passage, with the data on other passages, intersected, but the sniffing that the ill-formalness that has guaranteed verification phase data frame is discontinuity mistake, rather than there is the above continuous errors of 8 bit that can not survey risk.After adopting the successful verification of above-mentioned strategy to go out the unrepairable mistake on passage, bus is transmitted width and is again consulted, abandon disabled high-speed serial channel, the high-speed serial channel number of again deciding through consultation with receiving-transmitting sides is transmitted, now the parity block Crossover Strategy is changed according to highway width (passage number), guarantees the measurability that Frame makes a mistake.
The serial bus data transmission method that the embodiment of the present invention provides, improved the high speed transmission of signals quality, mainly refer to that chip design stage adopts the position mixed method, according to best mixed mode, serial-port is corresponded to physical link, reduce interconnected delay and noise that each interchannel brings owing to crosstalking, improved signal integrity; Strengthened the fault-tolerance of system, mainly referred to the application of parity block cross selection strategy, the Risk Reduction of can not surveying of the mistake that appearance mistake on serial-port is brought arrives minimum.Under the prerequisite that can survey in mistake, according to the transmission situation of passage, consult the transmission width, even physical fault appears in some passage, corresponding countermeasure is also arranged, according to each data block of port number cross-assignment again, bus still can continue normal operation.
Below in conjunction with accompanying drawing, embodiments of the invention three are described.
Describe respectively position in the embodiment of the present invention and mixed the implementation procedure of mating physical link and parity block cross selection transmission data.
In the embodiment of the present invention, the optimum bit mixed mode calculated according to delay model and emulation tool, as shown in Figure 2, correspond to the data on serial-port on physical link, data format on serial-port is continuous in Frame simultaneously, according to quadrant and skew, carries out the position coding.20 serial-ports of take are example, and the high-speed interconnect bus is divided into to 4 quadrants, and each quadrant accounts for 5 side-play amounts, and physical link directly corresponds to the cabling of connectivity port between the chip on printed circuit board.The position mixed mode is mated 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 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 is less than 2, according to following expression, determine the physical link numbering that this serial-port is corresponding:
Physical link numbering N=(the largest serial port number supported of system/4) * (1+ quadrature)-biased value-1 of moving;
When the quadrature of serial-port is more than or equal to 2, according to following expression, determine the physical link numbering that this serial-port is corresponding:
Physical link numbering N=(the largest serial port number supported of system/4) * (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 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, the parallel data frame data length of take is described the odd-even interleaving selection strategy of high speed interconnection as 80 bits as example: Frame is divided into 4 data blocks by section, 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 the serial-port of supporting when system adds up to 20, data block length and serial-port are equal in length, and strange piece and even piece intersect and take serial-port, and each clock cycle has a data block to be issued, and sending a complete Frame needs 4 clock cycle.Data block corresponds on passage according to the position mixed mode, and position adjacent in data block has been assigned on different physical channels, thereby has avoided on the single physical passage occurring that continuous mistake causes the immesurable situation of Frame mistake.When the unrepairable mistake appears in one or more passages, both sides consult to transmit width again.When the serial-port of supporting when system adds up to 10, half that clock cycle data length that can transmit is data block length.Now the odd-even interleaving strategy changes adjacent data block intersection transmission into, in each data block, adjacent position also intersects transmission, odd bits as first cycle transmission odd number piece, 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, until all data blocks are sent, then carries out the cross selection of next Frame.When the serial-port of supporting when system adds up to 5, clock cycle data length that can transmit is data block length 1/4th.Now the odd-even interleaving strategy is made corresponding variation again, and adjacent data block is intersected transmission, and the data bit within every 4 of each data block is also intersected transmission, as first cycle sends the 0th of 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 until all data blocks are sent, then carry out the cross selection of next Frame.
Below in conjunction with accompanying drawing, embodiments of the invention five are described.
The embodiment of the present invention provides a kind of serial bus data-transmission apparatus, and its structure as shown in Figure 5, comprising:
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 that same quadrature is corresponding form quadrant, the biased value difference of moving of the different serial-ports that quadrature is identical;
Physical link matching module 502, for the quadrature according to each serial-port and the biased value that moves, carry out the position coding, and each serial-port is matched to corresponding physical link, and adjacent serial-port is matched to non-conterminous physical link;
Preferably, the structure of described data transmission module 503 as shown in Figure 6, comprising:
Data block division unit 5031, for data frame dividing waiting for transmission is become to data block, is each data block numbering;
Data block transmitting element 5032, send the data block that is numbered odd number and the data block that is numbered even number for intersecting, and everybody intersection of described data block is evenly distributed on each serial-port and transmits, and the figure place of described data block equals the serial-port number.
Preferably, described data block division unit 5031, also for when the unrepairable mistake appears in one or more serial-ports, adjust the data block size according to the serial-port quantity of current normal operation.
A kind of serial bus data-transmission apparatus that the embodiment of the present invention provides, a kind of serial bus data transmission method that can provide with embodiments of the invention combines, for each serial-port in a plurality of serial-ports distributes quadrature and the biased value that moves, a plurality of serial-ports that same quadrature is corresponding form 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 to 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, reduced crosstalking between adjacent physical link, solved the problem of cross talk effects transfer of data.
The all or part of step that one of ordinary skill in the art will appreciate that above-described embodiment can realize by the computer program flow process, described computer program can be stored in a computer-readable recording medium, described computer program (as system, unit, device etc.) on corresponding hardware platform is carried out, when carrying out, comprise step of embodiment of the method one or a combination set of.
Alternatively, all or part of step of above-described embodiment also can realize with integrated circuit, and these steps can be made into respectively integrated circuit modules one by one, or a plurality of modules in them or step are made into to the single integrated circuit module realize.Like this, the present invention is not restricted to any specific hardware and software combination.
Each device/functional module/functional unit in above-described embodiment can adopt general calculation element to realize, they can concentrate on single calculation element, also can be distributed on the network that a plurality of calculation elements form.
The form of software function module of usining each device/functional module/functional unit in above-described embodiment realizes and during as production marketing independently or use, can be stored in a computer read/write memory medium.The above-mentioned computer read/write memory medium of mentioning can be 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, within all should being encompassed in 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 that same quadrature is corresponding form quadrant, the biased value difference of moving of the different serial-ports that quadrature is identical;
According to quadrature and the biased value that moves of each serial-port, carry out the position coding, adopt the position mixed method, according to best mixed mode, each serial-port is corresponded to 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 thering is 20 serial-ports, these 20 serial-ports are divided into to 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 3, is characterized in that, the described position coding that carries out matches corresponding physical link by each serial-port and is specially:
When the quadrature of serial-port is less than 2, according to following expression, determine the physical link numbering that this serial-port is corresponding:
The largest serial port number that physical link numbering N=(system is supported/4) * (1+ quadrature)-biased value-1 of moving;
When the quadrature of serial-port is more than or equal to 2, according to following expression, determine the physical link numbering that this serial-port is corresponding:
The largest serial port number that physical link numbering N=(system is supported/4) * (5+ quadrature)+biased value that moves.
5. serial bus data transmission method according to claim 1, is characterized in that, describedly by the serial-port transmission data after coupling, is specially:
Data frame dividing waiting for transmission is become to data block, is each data block numbering;
Intersect and send the data block that is numbered odd number and the data block that is numbered even number, everybody intersection of described data block is evenly distributed on each serial-port and transmits, 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, the method also comprises:
When the unrepairable mistake appears in one or more serial-ports, according to the serial-port quantity of current normal operation, adjust the data block size.
7. a serial bus data-transmission apparatus, 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 that same quadrature is corresponding form quadrant, the biased value difference of moving of the different serial-ports that quadrature is identical;
The physical link matching module, for quadrature and the biased value that moves according to each serial-port, carry out the position coding, adopt the position mixed method, according to best mixed mode, each serial-port is corresponded to physical link, adjacent serial-port is matched to non-conterminous physical link;
Data transmission module, for the transmission of the serial-port by after coupling data.
8. serial bus data-transmission apparatus according to claim 7, is characterized in that, described data transmission module comprises:
The data block division unit, for data frame dividing waiting for transmission is become to data block, is each data block numbering;
The data block transmitting element, send the data block that is numbered odd number and the data block that is numbered even number for intersecting, and everybody intersection of described data block is evenly distributed on each serial-port and transmits, and the figure place of described data block equals the serial-port number.
9. serial bus data-transmission apparatus according to claim 8, is characterized in that,
Described data block division unit, also for when the unrepairable mistake appears in one or more serial-ports, adjust the data block size according to the serial-port quantity of current normal operation.
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| 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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