CN103095445A - Transmitting-receiving device for adjusting transmit clock and relevant method - Google Patents
Transmitting-receiving device for adjusting transmit clock and relevant method Download PDFInfo
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- CN103095445A CN103095445A CN2011103325942A CN201110332594A CN103095445A CN 103095445 A CN103095445 A CN 103095445A CN 2011103325942 A CN2011103325942 A CN 2011103325942A CN 201110332594 A CN201110332594 A CN 201110332594A CN 103095445 A CN103095445 A CN 103095445A
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Abstract
The invention discloses a transmitting-receiving device for adjusting a transmit clock and a relevant method. The transmitting-receiving device for adjusting the transmit clock comprises a transmitting unit, a receiving unit, and a transmitting clock tracing unit, wherein the transmitting unit is used for transmitting a transmitting signal according to the transmitting clock, the receiving unit is used for receiving a receiving signal, and the transmitting clock tracing unit is connected to the transmitting unit and the receiving unit in a coupling mode and is used for controlling the frequency of the transmitting clock of the transmitting unit in a dynamic mode according to the receiving clock of the receiving signal.
Description
Technical field
The invention relates to a kind of communication system R-T unit, espespecially a kind of R-T unit of communication system and its correlation technique.
Background technology
Will consulting (definition) be defined in the transmission of data in Gigabit Ethernet (Gigabit Ethernet) standard before, to go out an end be holotype (Master mode), and the other end is secondary mode (Slave mode), such regulation can so that both sides the transmission in the middle of, operate in same frequency, that is to say, the equipment that is in holotype is that the frequency that the transmission signal is gone out is fixing; And be in the equipment of secondary mode, be that to transmit the frequency of signal identical with the frequency of the reception signal that receives (that is the equipment that, is in holotype transmits the frequency that signal is come).Due to have some adopt with a pair of line transmit with the standard of the full duplex system that receives (for example: high resolution multimedia interface (High Definition Multimedia Interface, HDMI) do not have under the mechanism of as offered master/secondary mode (Master/Slave mode) 1.4 editions specifications (being called for short " HDMI 1.4 ")), when the frequency at two ends is not identical, can increase the complexity of hardware designs.
Therefore, how no matter whether to have under the running of the mechanism of consulting master/secondary mode (Master/Slave mode), and whole transmission operates also can normally transmit and becomes this area and have the problem of usually knowing solution that the knowledgeable needs badly under the complexity of simplifying hardware designs.
Summary of the invention
Therefore, the embodiment of the present invention purpose is to solve the not identical problem of device frequency at two ends.
According to one embodiment of the invention, it provides the R-T unit of a kind of adjustment one transmission clock, and this R-T unit includes a delivery unit, a receiving element and a transmission clock tracing unit.Delivery unit is used for transmitting signal according to this transmission clock; Receiving element is used for receiving signal; And this transmission clock tracing unit is coupled to this delivery unit and this receiving element, is used for adjusting according to a receive clock of this reception signal the frequency of this transmission clock of this delivery unit.
According to another embodiment of the present invention, it provides the method for a transmission clock of a kind of adjustment one R-T unit, and the method includes: transmit signal according to this transmission clock; Receive signal and produce a receive clock; And the frequency of adjusting this transmission clock according to this receive clock of this reception signal.
Description of drawings
Fig. 1 is the schematic diagram of an embodiment of a kind of capable of dynamic of the present invention R-T unit of controlling a transmission clock.
Fig. 2 is that R-T unit operates in the transmission clock of a holotype, a secondary mode and a soft secondary mode and a schematic diagram of receive clock.
Fig. 3 is the schematic diagram of an embodiment of the transmission clock tracing unit of Fig. 1.
Fig. 4 is the schematic diagram of the operation of transmission clock tracing unit.
Fig. 5 is the flow chart of an example operation of the method for a kind of capable of dynamic of a present invention transmission clock of controlling a R-T unit.
Fig. 6 is the flow chart of the example operation of step S530 in Fig. 5.
Fig. 7 is that one of R-T unit shown in Figure 1 is implemented schematic diagram in detail.
Symbol description
100 R-T unit 110 delivery units
120 receiving element 122 buffers
130,330 transmission clock tracing unit 332 detecting units
334 setup unit 336 comparing units
338 adjustment unit 1111 coding units
1112 digital to analog converter 1211 time sequence recovery circuits
1212,1215 equalizer 1213 cutters
1214 digital automatic gain control circuit 1216 analog-to-digital converters
1217 low pass filter 1218 programmable gain amplifiers
1219 echo cancellation circuit coupling 1220 buffers
140 hybrid circuits
Embodiment
The person with usual knowledge in their respective areas should understand, and uses different nouns and calls same assembly.This specification and follow-up claim are the criterions that the difference on function is used as distinguishing with assembly.Again, in specification and follow-up claim, be an open term mentioned " comprising " in the whole text, therefore should be construed to " comprise but be not limited to ".In addition, " couple " word and comprise any means that indirectly are electrically connected that directly reach at this.
Please refer to Fig. 1, Fig. 1 is the schematic diagram of an embodiment of a kind of capable of dynamic of the present invention R-T unit 100 of controlling a transmission clock TCK.As shown in Figure 1, R-T unit 100 includes (being not limited to) delivery unit 110, a receiving element 120 and a transmission clock tracing unit 130.Delivery unit 110 is used for transmitting signal TS according to transmission clock TCK, and receiving element 120 is used for receiving signal RS and produces a receive clock RCK, and the numerical value of the frequency of receive clock RCK can be stored in a buffer 122.Please note, buffer 122 is sequential restore circuit (Timing recovery that are positioned at receiving element 120, TR) in, in addition, transmission clock tracing unit 130 is coupled to delivery unit 110 and receiving element 120, is used for dynamically controlling according to the receive clock RCK that receives signal RS the frequency of the transmission clock TCK of delivery unit 110.
R-T unit 100 of the present invention can operate in different mode of operations, with the mode of operation that coordinates other end equipment to be operated, so R-T unit 100 of the present invention is applicable to different transport interface.Be the schematic diagram that R-T unit of the present invention operates in a holotype (transmission clock TCK and receive clock RCK) with reference to figure 2a.That is, the equipment of the other end operates in a secondary mode.In other words, under this pattern, this delivery unit of R-T unit 100 of the present invention sends out the frequency of transmission clock TCK for fixing.Fig. 2 b is the schematic diagram that R-T unit operates in a secondary mode (transmission clock TCK and receive clock RCK).That is, the equipment of the other end is to operate in a holotype.Under this pattern, the frequency of the transmission clock TCK that this delivery unit of R-T unit 100 of the present invention sends out is identical with the frequency of the receive clock RCK that this receiving element receives.Fig. 2 c is the schematic diagram that this R-T unit of the present invention operates in a soft secondary mode (transmission clock TCK and receive clock RCK).Note that as shown in Fig. 2 c, when R-T unit operates in this soft secondary mode, transmission clock TCK possibility selective reception clock RCK or a free oscillation clock that sets, the foundation of judgement operates by transmission clock tracing unit 130.In other words, under this soft secondary mode, transmission clock tracing unit 130 can dynamically switch the transmission clock TCK of this delivery unit.Another embodiment, if R-T unit of the present invention 100 be applied in there is no master/secondary mode (Master/Slave mode) mechanism system under, R-T unit of the present invention can be operated in this soft secondary mode and get final product normal operation.
Please refer to Fig. 3, Fig. 3 is the schematic diagram of an embodiment of the transmission clock tracing unit of Fig. 1.As shown in Figure 3, transmission clock tracing unit 330 includes a detecting unit 332, a setup unit 334, a comparing unit 336 and an adjustment unit 338.
Detecting unit 332 is used for detecting the frequency of the receive clock RCK that receives signal RS.Setup unit 334 is used for setting one first clock critical value TH1 and a second clock critical value TH2, and wherein the first clock critical value TH1 is greater than second clock critical value TH2.Comparing unit 336 is coupled to detecting unit 332 and setup unit 334, is used for the frequency of comparison receive clock RCK and the first clock critical value TH1 and second clock critical value TH2 to produce a comparative result CR.The frequency that shows receive clock RCK as comparative result CR is during greater than the first clock critical value TH1, and adjustment unit 338 just can be adjusted near frequency to the first clock critical value TH1 of transmission clock TCK or its; When the frequency of comparative result CR indication receive clock RCK during less than second clock critical value TH2, the frequency that adjustment unit 338 just can be adjusted transmission clock TCK is near second clock critical value TH2 or its; And when the frequency of comparative result CR indication receive clock RCK during between this first clock critical value TH1 and second clock critical value TH2, the frequency that adjustment unit 338 is adjusted transmission clock TCK to the frequency of receive clock RCK allows the frequency of frequency tracking receive clock RCK of transmission clock TCK.
please refer to Fig. 4, Fig. 4 is the schematic diagram of the operation of transmission clock tracing unit 330, when sequential T0, detecting unit 332 can be detected the frequency of the receive clock RCK that receives signal RS, when sequential T1, the frequency that adjustment unit 338 just can be adjusted the frequency of transmission clock TCK and receive clock RCK is close, when sequential T2, the frequency of transmission clock TCK just can dynamic tracing receive clock RCK frequency, please note, during sequential T2 to T3, because the frequency of receive clock RCK is between this first clock critical value TH1 and second clock critical value TH2, therefore, adjustment unit 338 just frequency to the frequency of receive clock RCK of capable of regulating transmission clock TCK allows the frequency of frequency tracking receive clock RCK of transmission clock TCK.And during sequential T3 to T4, the frequency of receive clock RCK is during greater than the first clock critical value TH1, therefore, adjustment unit 338 just can be adjusted frequency to the first clock critical value TH1 of transmission clock TCK, until after sequential T4, because the frequency of receive clock RCK is again between this first clock critical value TH1 and second clock critical value TH2, therefore, adjustment unit 338 frequency of just adjusting transmission clock TCK to the frequency of receive clock RCK allows the frequency of frequency tracking receive clock RCK of transmission clock TCK.
One embodiment, R-T unit 100 can be applicable to a high resolution multimedia interface (High Definition Multimedia Interface, HDMI).R-T unit 100 carries out network on-line through HDMI interface and a network equipment, and wherein this network equipment may operate in a holotype (Master mode), a secondary mode (Slave mode) or a soft secondary mode (Soft-slave mode).For example work as this network equipment and operate in this holotype, R-T unit 100 operates in soft secondary mode, the frequency due to the transmission clock TCK of this network equipment keeps motionless, so the frequency of the receive clock RCK of R-T unit 100 can keep the Frequency Synchronization with the transmission clock TCK of this network equipment, and due to dynamic tracing, the frequency of the transmission clock TCK of the R-T unit 100 also frequency with the receive clock RCK of the frequency of R-T unit 100 is identical; Operate in secondary mode and work as this network equipment, R-T unit 100 operates in soft secondary mode, owing to can lacking like this a reference frequency point, can make overall frequency have the phenomenon of rocking, but can limit the frequency of its transmission clock TCK due to the dynamic tracing of R-T unit 100, and make overall frequency equate, and do not have the phenomenon that exceeds in setting range; And operate in soft secondary mode when this network equipment, and R-T unit 100 operates in soft secondary mode, and this situation is identical when operating in secondary mode with this network equipment, make frequency to equate because both sides can adjust mutually, and does not have and exceed the interior phenomenon of setting range.
Please refer to Fig. 5, Fig. 5 is the flow chart of an example operation of the method for a kind of capable of dynamic of a present invention transmission clock of controlling a R-T unit, it comprises (but being not limited to) following step and (please notes, if can obtain identical in fact result, these steps might not be carried out in accordance with execution order shown in Figure 5):
Step S510: transmit signal according to this transmission clock.
Step S520: receive signal and produce a receive clock.
Step S530: the frequency of dynamically controlling this transmission clock according to this this receive clock that receives signal.
How to operate owing to can understanding each element in conjunction with each step shown in Figure 5 and each element shown in Figure 1, for for purpose of brevity, therefore repeat no more in this.
Please refer to Fig. 6, Fig. 6 is the flow chart of the example operation of step S530 in Fig. 5, it comprises (but being not limited to) following step (if note that can obtain identical in fact result, these steps might not be carried out in accordance with execution order shown in Figure 6).
How to operate owing to can understanding each element in conjunction with each step shown in Figure 6 and each element shown in Figure 3, for for purpose of brevity, therefore repeat no more in this.Wherein, step S632 is carried out by detecting unit, and step S634 is carried out by setup unit, and step S636 is carried out by comparing unit, and step S638, S639, S640 are carried out by adjustment unit.
Fig. 7 is applied to physical layer (PHY) circuit diagram of HDMI 1.4 specifications according to R-T unit 100 of the present invention.Wherein, R-T unit 100 includes delivery unit 110, receiving element 120, clock tracing unit 130 and hybrid circuit 140.Wherein, delivery unit 110 and receiving element 120 meet the related specifications of the physical layer of HDMI 1.4 specifications, therefore if R-T unit 100 of the present invention is applied to the application of other interface specification, delivery unit 110 must appropriateness be adjusted to meet related specifications with the circuit of receiving element 120.In other words, delivery unit 110 should not be restriction of the present invention with the detailed circuit of receiving element 120, and is only that exemplary applications of the present invention is described.Consult other related specifications and just can obtain to be applied to the circuit diagram at other interface.In this embodiment, delivery unit 110 comprises that a multilayer transmits coding unit (Multi-level transmit encoder, MLT-3) 1111 and one digital to analog converter 1112.the receiving element 120 of Fig. 7 includes a sequential restore circuit 1211, one reaction type equalizer (Feedback equalizer) 1212, one cutter 1213, one digital automatic gain control circuit 1214, one feed forward type equalizer (Feed-forward equalizer) 1215, one analog-to-digital converter 1216, one low pass filter 1217, one programmable gain amplifier 1218, one echo cancellation circuit coupling (Echo canceller) 1219, one first-in first-out buffer (FIFO) 1220.By clock tracing unit 130, can be according to the clock of the reception signal of receiving element 120, with the frequency of the transmission clock of dynamic control delivery unit 110.
In addition, the present invention can avoid equaling in the situation of frequency of receive clock RCK when frequency that both sides all operate in transmission clock TCK, and frequency of operation can be because the interference of channel or other factors make the integrated operation frequency diffuse to uncertain situation.In addition, it is high that the present invention has a homogeny, that is, no matter operate in holotype, a secondary mode or a soft secondary mode with the online device of this receiver, the present invention all can support.
The above is only preferred embodiment of the present invention, is not to limit to category of the present invention.All equalizations of doing according to the present patent application the scope of the claims change and modify, and all should belong to covering scope of the present invention.
Claims (11)
1. R-T unit of adjusting a transmission clock, described R-T unit includes:
One delivery unit transmits signal according to described transmission clock;
One receiving element receives signal, produces a receive clock according to described reception signal; And
One transmission clock tracing unit, be coupled to described delivery unit and described receiving element, wherein said transmission clock tracing unit includes a setup unit, described setup unit stores a clock critical range, described transmission clock tracing unit is controlled the frequency of the described transmission clock of described delivery unit according to described receive clock and described clock critical range, wherein, the frequency of described transmission clock is between described clock critical range.
2. R-T unit according to claim 1, wherein said clock critical range comprises one first clock critical value and a second clock critical value, wherein said the first clock critical value is greater than described second clock critical value; When wherein, the frequency of described receive clock is adjusted the frequency of described transmission clock to described the first clock critical value during greater than described the first clock critical value; During less than described second clock critical value, adjust the frequency of described transmission clock to described second clock critical value when the frequency of described receive clock; And when the frequency of described receive clock is positioned at described clock critical range, follow the trail of the frequency of described receive clock to adjust the frequency of described transmission clock.
3. R-T unit according to claim 1, wherein said R-T unit has three kinds of operator schemes, includes: a holotype, a secondary mode and a soft secondary mode.
4. R-T unit according to claim 3, wherein said R-T unit carries out transfer of data by a high resolution multimedia interface and a device.
5. R-T unit according to claim 1, wherein said receiving element includes a buffer, is used for storing the numerical value of the frequency of described transmission clock.
6. method of adjusting a transmission clock of a R-T unit, described method includes:
Transmit signal according to described transmission clock;
Receive signal and produce a receive clock; And
Dynamically control the frequency of described transmission clock according to the described receive clock of described reception signal.
7. method according to claim 6 wherein also includes according to the step that the described receive clock of described reception signal is dynamically controlled the frequency of described transmission clock:
Detect the frequency of the described receive clock of described reception signal;
Set one first clock critical value and a second clock critical value, wherein said the first clock critical value is greater than described second clock critical value; And
During greater than described the first clock critical value, adjust the frequency of described transmission clock to described the first clock critical value when the frequency of described receive clock; During less than described second clock critical value, adjust the frequency of described transmission clock to described second clock critical value when the frequency of described receive clock; And when the frequency of described receive clock is between described the first clock critical value and described second clock critical value, follow the trail of the frequency of described receive clock to adjust the frequency of described transmission clock.
8. method according to claim 6, wherein said R-T unit has three kinds of operator schemes, includes: a holotype, a secondary mode and a soft secondary mode.
9. method according to claim 8, wherein under described soft secondary mode, described R-T unit dynamically switches the frequency of described transmission clock.
10. method according to claim 6, wherein said R-T unit carries out transfer of data by a high resolution multimedia interface and a device.
11. method according to claim 6 wherein receives the numerical value that step that described reception signal produces described receive clock also includes the frequency that stores described transmission clock.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110332594.2A CN103095445B (en) | 2011-10-27 | 2011-10-27 | R-T unit of adjustment transmission clock and associated method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110332594.2A CN103095445B (en) | 2011-10-27 | 2011-10-27 | R-T unit of adjustment transmission clock and associated method |
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| CN103095445A true CN103095445A (en) | 2013-05-08 |
| CN103095445B CN103095445B (en) | 2015-10-21 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104601335A (en) * | 2013-11-01 | 2015-05-06 | 瑞昱半导体股份有限公司 | Network device with a plurality of transmission ports |
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| US6370600B1 (en) * | 1999-05-25 | 2002-04-09 | Advanced Micro Devices, Inc. | Staging buffer for translating clock domains when source clock frequency exceeds target clock frequency |
| CN1722654B (en) * | 2004-12-31 | 2010-04-14 | 杭州华三通信技术有限公司 | Ethernet equipment time clock adjustment device |
| US20110043694A1 (en) * | 2008-03-28 | 2011-02-24 | Takashi Izuno | Transmitting apparatus, receiving apparatus and contents reproducing system |
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2011
- 2011-10-27 CN CN201110332594.2A patent/CN103095445B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6370600B1 (en) * | 1999-05-25 | 2002-04-09 | Advanced Micro Devices, Inc. | Staging buffer for translating clock domains when source clock frequency exceeds target clock frequency |
| CN1722654B (en) * | 2004-12-31 | 2010-04-14 | 杭州华三通信技术有限公司 | Ethernet equipment time clock adjustment device |
| US20110043694A1 (en) * | 2008-03-28 | 2011-02-24 | Takashi Izuno | Transmitting apparatus, receiving apparatus and contents reproducing system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104601335A (en) * | 2013-11-01 | 2015-05-06 | 瑞昱半导体股份有限公司 | Network device with a plurality of transmission ports |
| CN104601335B (en) * | 2013-11-01 | 2018-04-03 | 瑞昱半导体股份有限公司 | The network equipment of multiple transmission ports |
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| Publication number | Publication date |
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| CN103095445B (en) | 2015-10-21 |
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