CN102780552A - Signal correction method and related client circuit and transmission system - Google Patents
Signal correction method and related client circuit and transmission system Download PDFInfo
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- CN102780552A CN102780552A CN2011101235602A CN201110123560A CN102780552A CN 102780552 A CN102780552 A CN 102780552A CN 2011101235602 A CN2011101235602 A CN 2011101235602A CN 201110123560 A CN201110123560 A CN 201110123560A CN 102780552 A CN102780552 A CN 102780552A
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Abstract
The invention discloses a signal correction method which is used for synchronizing a time sequence of a frequency signal and at least one data signal in a transmission system. The signal correction method comprises the following steps of detecting at least one transmission time difference between the frequency signal and the at least one data signal in the transmission system, calculating a plurality of delay time of the frequency signal and the at least one data signal in accordance with the at least one transmission time difference, and respectively delaying the frequency signal and the at least one data signal in accordance with the delay time so as to synchronize the time sequence of the frequency signal and the at least one data signal.
Description
Technical field
The present invention relates to a kind of signal calibration method and relevant client circuit and transmission system, refer to especially a kind ofly judge the transmission time in client, and the bearing calibration and relevant client circuit and transmission system of synchronous frequency signal and data-signal according to this.
Background technology
Along with the evolution of science and technology, in the electronics and IT products, the transmission quantity of data is increasing.In the case; The high speed serial transmission technology; For example move the industry processor interface (Mobile Industry Processor Interface, MIPI), the action display digital interface (Mobile Display Digital Interface, MDDI) and universal serial bus (Universal Serial Bus; USB), be widely used.Yet the fault-tolerant space when high-speed transfer means transfer of data diminishes.
For instance, please refer to Fig. 1, Fig. 1 is the sketch map of a known high speed serial transmission interface 10.Coffret 10 includes a main control end circuit 100, transmission line 110_C, 110_D and a client circuit 120.Main control end circuit 100 includes conveyer 102_C, 102D, is used for transmitting a frequency signal CLK and a data-signal DA respectively.Frequency signal CLK and data-signal DA are sent to client circuit 120 through transmission line 110_C, 110_D.Relatively, client circuit 120 includes receiver 122_C, 122_D and a treatment circuit 124.Receiver 122_C, 122_D are used for receiving frequency signals CLK and data-signal DA respectively.At last, treatment circuit 124 is according to frequency signal CLK, readout data signal DA.In ideal situation, the transmission time of the transmission time of frequency signal CLK with data-signal DA equates, shown in Fig. 2 A.In Fig. 2 A, the rising edge of frequency signal CLK and falling edge are the opportunity of treatment circuit 124 readout data signal DA, and the shortest time of the rising edge of range data signal DA and falling edge is period Ts, Th.In general, the optimum value of period Ts, Th is relevant with system performance, and the design of Ts=Th is merely a kind of embodiment among Fig. 2 A.
Yet in practical application; Because the length of transmission line 110_C, 110_D or all factors such as load is asymmetric, the load of receiver 122_C, 122_D is asymmetric, conveyer 102_C, 102D output are asymmetric, the impedance of main control end circuit 100 and 120 existence of client circuit is discontinuous; There is skew (skew) in the coffret 10, causes the time of frequency signal CLK and data-signal DA arrival client circuit 120 inequality.For instance, please refer to Fig. 2 B and Fig. 2 C, Fig. 2 B is the signal timing diagram of the leading frequency signal CLK of data-signal DA, and Fig. 2 C falls behind the signal timing diagram of frequency signal CLK for data-signal DA.In Fig. 2 B, treatment circuit 124 is " 0101010 " according to the data that frequency signal CLK reads, and is different from correct transmission result " 1010101 ".Similarly, in Fig. 2 C, treatment circuit 124 also is wrong " 0101010 " according to the data that frequency signal CLK reads.
Certainly, the coffret 10 of Fig. 1 is merely the simplest embodiment of convenient explanation, and actual coffret comprises more transmission channel, and is as shown in Figure 3.In Fig. 3, there is relation leading or that fall behind between the frequency signal CLK in the coffret 30 and data-signal DA1～DAn, and then causes the data acquisition mistake.Under the trend that the frequency of frequency signal CLK promotes gradually, the fault-tolerant space of signal bias (period Ts, Th) more and more narrow, therefore, in order to keep the accuracy of transfer of data, known coffret is real to have improved necessity.
Summary of the invention
Therefore, main purpose of the present invention promptly is to provide a kind of signal calibration method and relevant client circuit and transmission system.
The present invention discloses a kind of signal calibration method, is used for the sequential of a synchronous transmission system one frequency signal and at least one data-signal.This signal calibration method includes between this frequency signal of detecting and this at least one data-signal at least one transmission time difference of this transmission system; According to this at least one transmission time difference, calculate a plurality of time of delays of this frequency signal and this at least one data-signal; And, postpone this frequency signal and this at least one data-signal respectively according to these a plurality of time of delays, with the sequential of synchronous this frequency signal and this at least one data-signal.
The present invention also discloses a kind of client circuit, is used for receiving and a synchronous transmission system one frequency signal and at least one data-signal.This client circuit includes a plurality of receivers, is used for receiving this frequency signal and this at least one data-signal; One correcting circuit includes a detecting unit, is used for detecting between this frequency signal and this at least one data-signal at least one transmission time difference of this transmission system; And an arithmetic element, be used for according to this at least one transmission time difference a plurality of time of delays of calculating this frequency signal and this at least one data-signal; And a plurality of frequency delay cells, be used for postponing this frequency signal and this at least one data-signal respectively, with the sequential of synchronous this frequency signal and this at least one data-signal according to these a plurality of time of delays.
The present invention also discloses a kind of transmission system, is used for transmitting a frequency signal and at least one data-signal.This transmission system includes a main control end circuit, includes a plurality of conveyers, is used for sending this frequency signal and this at least one data-signal respectively; Plurality of transmission lines is used for transmitting this frequency signal and this at least one data-signal respectively; One client circuit includes a plurality of receivers, is used for receiving this frequency signal and this at least one data-signal; One correcting circuit includes a detecting unit, is used for detecting between this frequency signal and this at least one data-signal at least one transmission time difference of this transmission system; And an arithmetic element, be used for according to this at least one transmission time difference a plurality of time of delays of calculating this frequency signal and this at least one data-signal; And a plurality of delay cells, be used for postponing this frequency signal and this at least one data-signal respectively, with the sequential of synchronous this frequency signal and this at least one data-signal according to these a plurality of time of delays.
Cooperate detailed description and claims of following diagram, embodiment at this, will on address other purpose of the present invention and advantage and be specified in after.
Description of drawings
Fig. 1 is the sketch map of a known coffret.
Fig. 2 A is the sequential chart of a frequency signal and a data-signal in the coffret of Fig. 1.
Sequential chart when Fig. 2 B is the leading frequency signal of the data-signal of Fig. 2 A.
Fig. 2 C is the sequential chart of the data-signal of Fig. 2 A when falling behind frequency signal.
Fig. 3 is the sketch map of known another coffret and coherent signal.
Fig. 4 A is the sketch map of the embodiment of the invention one transmission system.
Fig. 4 B is the sketch map of a correcting circuit in the transmission system of Fig. 4 A.
Fig. 5 and Fig. 6 postpone the sequential chart of a data-signal and a frequency signal for a detecting unit in the correcting circuit of Fig. 4 B.
Fig. 7 is the sequential chart of signal transmission time and corresponding time of delay in the transmission system of Fig. 4 A.
Fig. 8 is the sketch map of an alternate embodiment of the transmission system of Fig. 4 A.
Fig. 9 is an alternate embodiment and the sketch map of relevant differential signal of the transmission system of Fig. 4 A.
Figure 10 is the sketch map of the embodiment of the invention one signal correction flow process.
Figure 11 A and Figure 11 b are the sketch map of main control end circuit indication task definition in the transmission system of Fig. 4 A.
Wherein, description of reference numerals is following:
The CLK frequency signal
CLK+ positive frequency signal
CLK-negative frequency signal
DA, DA1, DA2, DAm, DAx data-signal
DA1+, DA2+, DAm+ positive data signal
DA1-, DA2-, DAm-negative data signal
DLY0, DLY1, DLY2, DLYm time of delay
Ts, Ts1, Ts2, Tsn, Tsx, Tsm, Th, period
Th1、Th2、Thn、Thx、Thm
TD1, TDm transmission time difference
The Td unit interval
The Rx test result
10,30 coffrets
40,90 transmission systems
100,300,400 main control end circuit
102_C, 102_D, 302_C, 302_D1, conveyer
302_D2、302_Dn、402_0、402_1、
402_2、40_2m
110_C, 110_D, 310_C, 310_D1, transmission line
310_D2、310_Dn、410_0、410_1、
410_2、410_m
120,320,420 client circuit
122_C, 122_D, 322_C, 322_D1, receiver
322_D2、322_Dn、422_0、422_1、
422_2、422_m
124,324 treatment circuits
424 correcting circuits
4240 detecting units
4242 arithmetic elements
426_0,426_1,426_2,426_m delay cell
Embodiment
Please refer to Fig. 4 A, Fig. 4 A is the sketch map of the embodiment of the invention one transmission system 40.Transmission system 40 is used for transmitting a frequency signal CLK and data-signal DA1～DAm.Transmission system 40 includes a main control end circuit 400, transmission line 410_0～410_m and a client circuit 420.Main control end circuit 400 includes conveyer 402_0～402_m, is used for sending frequency signal CLK and data-signal DA1～DAm respectively.Transmission line 410_0～410_m is used for transmission frequency signal CLK and data-signal DA1～DAm respectively.Client circuit 420 includes receiver 422_0～422_m, a correcting circuit 424 and delay cell 426_0～426_m.Receiver 422_0～422_m is used for receiving frequency signals CLK and data-signal DA1～DAm.Correcting circuit 424 includes a detecting unit 4240 and an arithmetic element 4242, shown in Fig. 4 B.Detecting unit 4240 is used for detecting between frequency signal CLK and data-signal DA1～DAm in the transmission time difference TD1～TDm of transmission system 40.Arithmetic element 4242 is used for according to transmission time difference TD1～TDm, DLY0～DLYm time of delay of calculated rate signal CLK and data-signal DA1～DAm.At last, delay cell 426_0～426_m postpones frequency signal CLK and data-signal DA1～DAm respectively according to DLY0～DLYm time of delay, with the sequential of synchronous frequency signal CLK and data-signal DA1～DAm.
In simple terms, what are because client circuit 420 has no way of learning skew (skew) amount of received signal, client circuit 420 is carried out a correction program before formally beginning acquisition data signal DA1～DAm.Correcting circuit 424 is through transmission time difference TD1～TDm of comparison frequency signal CLK and data-signal DA1～DAm; Judge and transmit the slowest person in all signals; And postpone other signal, make the phase place of the slowest signal of transmission be able to catch up with other signal, with the sequential of synchronous all signals.Compare with the coffret 30 of Fig. 3, the correcting mode of transmission system 40 can utilize the instruction in the existing specification to carry out, and need not increase the redundancy of effort (overhead) of system.
In detail, please refer to Fig. 5, Fig. 5 is the sketch map of detecting unit 4240 detecting transmission time difference TD1～TDm.For the arbitrary stroke count number of it is believed that DAx, different multiples 1Td, the 2Td of detecting unit 4240 delayed data signal DAx one unit interval Td ..., kTd.In Fig. 5, k=19, detecting unit 4240 are according to rising edge and the falling edge of frequency signal CLK, and acquisition postpones the data of back data-signal DAx, to produce a test result Rx.Thus, detecting unit 4240 can pass through contrastive test Rx and the corresponding correct transmission result of data-signal DAx as a result, decision transmission time difference TDx.For instance, in Fig. 5, correct transmission result is " 1010101 ", and when data-signal DAx was postponed 2Td～8Td, 18Td, 19Td, test result Rx conformed to the correct transmission result.Because when being 5Td time of delay; The rising edge of the rising edge of frequency signal CLK and falling edge range data signal DAx and the Tsx of period the most in short-term of falling edge, Thx be symmetry the most; But detecting unit 4240 judgment data signal DAx take the lead frequency signal 5Td, that is transmission time difference TDx=5Td.In like manner, through data comparisons, detecting unit 4240 can be obtained transmission time difference TD1～TDm of all data-signal DA1～DAm and frequency signal CLK, as person's the foundation the most slowly of transmission speed in all signals of follow-up judgement.
Certainly, detecting unit 4240 also can postpone different multiples 1Td, the 2Td of frequency signal CLK unit interval Td except delayed data signal DA1～DAm ..., kTd; And through the transmission comparison as a result obtain transmission time difference TD1～TDm; As shown in Figure 6, its process is similar with Fig. 5, does not give unnecessary details at this.Can know that by Fig. 5 and Fig. 6 the unit interval, Td was more little, transmission time difference TD1～TDm that detecting unit 4240 is estimated is accurate more.
In case transmission time difference TD1～TDm is known, arithmetic element 4242 can be according to transmission time difference TD1～TDm, and slow signal among determination frequency signal CLK and the data-signal DA1～DAm, and the leading amount of the leading slow signal of other signal are as shown in Figure 7.In Fig. 7, slow signal is data-signal DA1, and the leading respectively slow signal DLY0～DLYm of frequency signal CLK and data-signal DA1～DAm.In other words, delay cell 426_0～426_m as time of delay, and postpones frequency signal CLK and data-signal DA1～DAm respectively with DLY0～DLYm according to this, but the sequential of synchronous frequency signal CLK and data-signal DA1～DAm.
It is noted that except being arranged between receiver 422_0～422_m and correcting circuit 424, delay cell 426_0～426_m also can be arranged at before receiver 422_0～422_m, and is as shown in Figure 8.In addition, the present invention also can be applicable in the transmission system 90 with differential signal transmission, and is as shown in Figure 9.In Fig. 9, transmit same differential right transmission line coupling, there is not skew between the moving signal of positive differential wave and minus tolerance, therefore signal calibration method of the present invention can directly be applied on the differential wave, and its correlative detail is similar with transmission system 40, does not give unnecessary details at this.
The operation of transmission system 40 can reduce a signal correction flow process 150, and is shown in figure 10.Signal correction flow process 150 includes the following step:
Step 1000: beginning.
Step 1002: detecting unit 4240 is detected between frequency signal CLK and data-signal DA1～DAm in the transmission time difference TD1～TDm of transmission system 40.
Step 1004: arithmetic element 4242 is according to transmission time difference TD1～TDm, DLY0～DLYm time of delay of calculated rate signal CLK and data-signal DA1～DAm.
Step 1006: delay cell 426_0～426_m postpones frequency signal CLK and data-signal DA1～DAm respectively according to DLY0～DLYm time of delay, with the sequential of synchronous frequency signal CLK and data-signal DA1～DAm.
Step 1008: finish.
The details of signal correction flow process 150 can not given unnecessary details at this with reference to above-mentioned explanation to transmission system 40.In theory, carrying out signal correction flow process 150 once is the signal bias that the recoverable transmission environment causes.Please refer to Figure 11 A, Figure 11 A is the sketch map of main control end circuit 400 indication actions.Main control end circuit 400 can add the indication of carrying out signal correction flow process 150 in data-signal DA1～DAm, with before client circuit 420 formal acquisition datas, the synchronizing signal sequential is to guarantee the correctness of Data Receiving, shown in Figure 11 A.Certainly, consider different application, in the signals transmission, also can periodically intert, carry out signal correction flow process 150, more stable to guarantee system, eliminate the signal bias factor that occurs at random, shown in Figure 11 B.
In known technology; Nonideal transmission environment; All factors such as for example length of transmission line or load load asymmetric, receiver is asymmetric, conveyer output is asymmetric cause signal in transmission course, to squint, and make client circuit 120 when acquisition data, produce mistake.In comparison, the present invention passes through comparison transmission result, estimates transmission time difference TD1～TDm between unlike signal, and postpones the signal of " taking the lead " according to this, with the sequential of synchronous all signals, and then guarantees the correctness that data read.In addition, the correcting mode of transmission system 40 can utilize the instruction in the existing specification to carry out, and need not increase the redundancy of effort of system.
In sum, the present invention passes through comparison transmission result, estimates transmission time difference between unlike signal, and postpones the signal of " taking the lead " according to this, with the sequential of synchronous all signals, and then guarantees the correctness that data read.
The above is merely the preferred embodiments of the present invention, and all equalizations of doing according to claim of the present invention change and modify, and all should belong to covering scope of the present invention.
Claims (15)
1. signal calibration method is used for the sequential of a synchronous transmission system one frequency signal and at least one data-signal, it is characterized in that this signal calibration method includes:
Detect between this frequency signal and this at least one data-signal at least one transmission time difference of this transmission system;
According to this at least one transmission time difference, calculate a plurality of time of delays of this frequency signal and this at least one data-signal; And
According to these a plurality of time of delays, postpone this frequency signal and this at least one data-signal respectively, with the sequential of synchronous this frequency signal and this at least one data-signal.
2. signal calibration method as claimed in claim 1 is characterized in that, detects between this frequency signal and this at least one data-signal in the step of this at least one transmission time difference of this transmission system, includes:
To this each data-signal, postpone the different multiples of one unit interval of this data-signal, with according to this frequency signal, produce a plurality of test results; And
To this each data-signal, compare these a plurality of test results and a correct transmission result, with this at least one transmission time difference of decision.
3. signal calibration method as claimed in claim 1 is characterized in that, detects between this frequency signal and this at least one data-signal in the step of this at least one transmission time difference of this transmission system, includes:
The different multiples that postpones one unit interval of this frequency signal with according to this at least one data-signal, produces a plurality of test results; And
To this each data-signal, compare the corresponding correct transmission result of these a plurality of test results and this data-signal, with this at least one transmission time difference of decision.
4. signal calibration method as claimed in claim 1 is characterized in that, according to this at least one transmission time difference, calculates the step of these a plurality of time of delays of this frequency signal and this at least one data-signal, includes:
According to this at least one transmission time difference, determine the slow signal of one in this frequency signal and this at least one data-signal;
Calculate a plurality of leading amount of leading this slow signal of this frequency signal and this at least one data-signal, as these a plurality of time of delays.
5. signal calibration method as claimed in claim 1 is characterized in that, this frequency signal and this at least one data-signal are differential waves.
6. a client circuit is used for receiving and a synchronous transmission system one frequency signal and at least one data-signal, it is characterized in that this client circuit includes:
A plurality of receivers are used for receiving this frequency signal and this at least one data-signal;
One correcting circuit includes:
One detecting unit is used for detecting between this frequency signal and this at least one data-signal at least one transmission time difference of this transmission system; And
One arithmetic element is used for according to this at least one transmission time difference a plurality of time of delays of calculating this frequency signal and this at least one data-signal; And
A plurality of frequency delay cells are used for postponing this frequency signal and this at least one data-signal respectively according to these a plurality of time of delays, with the sequential of synchronous this frequency signal and this at least one data-signal.
7. client circuit as claimed in claim 6 is characterized in that, this detecting unit is:
To this each data-signal, postpone the different multiples of one unit interval of this data-signal, with according to this frequency signal, produce a plurality of test results; And
To this each data-signal, compare the corresponding correct transmission result of these a plurality of test results and this data-signal, with this at least one transmission time difference of decision.
8. client circuit as claimed in claim 6 is characterized in that, this detecting unit is:
The different multiples that postpones one unit interval of this frequency signal with according to this at least one data-signal, produces a plurality of test results; And
To this each data-signal, compare the corresponding correct transmission result of these a plurality of test results and this data-signal, with this at least one transmission time difference of decision.
9. client circuit as claimed in claim 6 is characterized in that, this arithmetic element is:
According to this at least one transmission time difference, determine the slow signal of one in this frequency signal and this at least one data-signal; And
Calculate a plurality of leading amount of leading this slow signal of this frequency signal and this at least one data-signal, as these a plurality of time of delays.
10. client circuit as claimed in claim 6 is characterized in that, this frequency signal and this at least one data-signal are differential waves.
11. a transmission system is used for transmitting a frequency signal and at least one data-signal, it is characterized in that this transmission system includes:
One main control end circuit includes:
A plurality of conveyers are used for sending this frequency signal and this at least one data-signal respectively;
Plurality of transmission lines is used for transmitting this frequency signal and this at least one data-signal respectively;
One client circuit includes:
A plurality of receivers are used for receiving this frequency signal and this at least one data-signal;
One correcting circuit includes:
One detecting unit is used for detecting between this frequency signal and this at least one data-signal at least one transmission time difference of this transmission system; And
One arithmetic element is used for according to this at least one transmission time difference a plurality of time of delays of calculating this frequency signal and this at least one data-signal; And
A plurality of frequency delay cells are used for postponing this frequency signal and this at least one data-signal respectively according to these a plurality of time of delays, with the sequential of synchronous this frequency signal and this at least one data-signal.
12. transmission system as claimed in claim 11 is characterized in that, this detecting unit is:
To this each data-signal, postpone the different multiples of one unit interval of this data-signal, with according to this frequency signal, produce a plurality of test results; And
To this each data-signal, compare the corresponding correct transmission result of these a plurality of test results and this data-signal, with this at least one transmission time difference of decision.
13. transmission system as claimed in claim 11 is characterized in that, this detecting unit is:
The different multiples that postpones one unit interval of this frequency signal with according to this at least one data-signal, produces a plurality of test results; And
To this each data-signal, compare the corresponding correct transmission result of these a plurality of test results and this data-signal, with this at least one transmission time difference of decision.
14. transmission system as claimed in claim 11 is characterized in that, this arithmetic element is:
According to this at least one transmission time difference, determine in this frequency signal and this at least one data-signal slow signal; And
Calculate a plurality of leading amount of leading this slow signal of this frequency signal and this at least one data-signal, as these a plurality of time of delays.
15. transmission system as claimed in claim 11 is characterized in that, this frequency signal and this at least one data-signal are differential waves.
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| CN111163311A (en) * | 2020-02-13 | 2020-05-15 | 维沃移动通信有限公司 | Phase calibration method and electronic equipment |
| CN114095679A (en) * | 2020-08-07 | 2022-02-25 | 扬智科技股份有限公司 | Video transmission circuit and signal delay compensation method thereof |
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| CN111163311B (en) * | 2020-02-13 | 2022-05-24 | 维沃移动通信有限公司 | Phase calibration method and electronic device |
| CN114095679A (en) * | 2020-08-07 | 2022-02-25 | 扬智科技股份有限公司 | Video transmission circuit and signal delay compensation method thereof |
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| US11792358B2 (en) | 2020-08-07 | 2023-10-17 | Ali Corporation | Video transmitting circuit and signal delay compensation method thereof |
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Application publication date: 20121114 |