CN103581205A - Method and system for realizing precise timestamps in multiple MACs (media access controls) - Google Patents
Method and system for realizing precise timestamps in multiple MACs (media access controls) Download PDFInfo
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- CN103581205A CN103581205A CN201310593640.3A CN201310593640A CN103581205A CN 103581205 A CN103581205 A CN 103581205A CN 201310593640 A CN201310593640 A CN 201310593640A CN 103581205 A CN103581205 A CN 103581205A
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Abstract
The invention discloses a method and a system for realizing precise timestamps in multiple MACs (media access controls). A PTP (precision time protocol) message catches timestamps in a nanosecond format on an MAX RX; timestamps of the MAC RX when the MAC RX receives the PTP message are obtained through calculating timestamps in a second-plus-nanosecond format caught by an incoming-direction engine and the timestamps in the nanosecond format; residence timestamps are obtained through calculating the timestamps in the second-plus-nanosecond format caught by an outgoing-direction engine and the timestamps of the MAC RX when the MAC RX receives the PTP message, the residence timestamps are printed into fields of the PTP message, or the timestamps in the second-plus-nanosecond format caught by the outgoing-direction engine are directly printed into the fields of the PTP message; and the delay time of the outgoing-direction engine and an MAC TX are calculated according to the timestamps in the nanosecond format caught by the MAC TX and the timestamps in the nanosecond format sent by the outgoing-direction engine, and the delay time is printed into corresponding fields of the PTP message. According to the method and the system, a PTP specification with the accuracy as high as a nanosecond level can be realized, the bit width of a bus is reduced greatly, the wiring complexity is reduced, and meanwhile, the use cost is also saved.
Description
Technical field
The present invention relates to network communication field, especially relate to a kind of method and system that realize accurate time stamp in a plurality of MAC.
Background technology
Be accompanied by continuous increase and the development of network technology, especially Ethernet application in measurement and control system is more and more extensive, cyber-net industry is also in the problem of being devoted to solve the Timing Synchronization scarce capacity of Ethernet, to reduce other technology that adopts, the extra wiring expense of bringing such as IRIG-B etc., so develop a kind of NTP (Network Time Protocol) (NTP) of software mode, improve the Timing Synchronization ability between each network equipment.The synchronous accuracy of NTP version in 1992 can reach 200 μ s, but still can not meet the required accuracy of measuring instrument and Industry Control.In order to address this problem, also to meet other side demand simultaneously, the synchronous committee of network precision interval clock obtains the support of national institute of standards and technology of the IEEE instrumentation and testing committee (NIST) in calendar year 2001, the standard that this committee drafts will obtain the ieee standard committee in the end of the year 2002 to be passed through, as IEEE1588 standard.This standard definition be exactly PTP agreement (Precision Time Protocol).
PTP agreement stamp service time carrys out synchronous local zone time, and the Microsecond grade precision that it reaches makes this technology be applicable to the system based on Ethernet, and protocol requirement timestamp will be tried one's best near physical layer.But along with the development of ethernet technology, the accuracy of the Timing Synchronization of Ethernet has also been had to more and more higher requirement.
Summary of the invention
The object of the invention is to overcome the defect of prior art, a kind of method and system that realize accurate time stamp in a plurality of MAC are provided, realize PTP agreement up to other precision of nanosecond.
For achieving the above object, the present invention proposes following technical scheme: a kind of method that realizes accurate time stamp in a plurality of MAC, comprises the following steps:
Step 4, in outgoing direction engine, catch the described timestamp that adds nanosecond form second, with the timestamp that adds nanosecond form second calculating in step 3, calculate residence time stamp, described residence time stamp is squeezed into the field of PTP message, or the timestamp that adds nanosecond form second directly described outgoing direction engine being caught is squeezed into the field of PTP message;
Step 5, according to the transmission end of MAC controller, catch nanosecond form timestamp, pass over outgoing direction engine nanosecond form timestamp, calculate stamp time of delay of the transmission end of described outgoing direction engine and described MAC controller, and squeeze into the respective field of PTP message.
Preferably, in described step 1, in PTP engine, carry out time difference adjustment and drift adjustment, the timestamp that adds nanosecond form second after being adjusted, adopts the mode of broadcast step by step to send the timestamp of nanosecond form to receiving terminal and the transmission end of MAC controller.
Described PTP engine sends the timestamp of described nanosecond form to each MAC controller by first order QuadMAC module, the corresponding a plurality of independently MAC controller of each QuadMAC module.
The field of described PTP message comprises Timestamp field and CorrectField field, described residence time stamp is squeezed into the CorrectField field of PTP message, and the timestamp that adds nanosecond form second that described outgoing direction engine catches is squeezed into the Timestamp field of PTP message.
Squeeze into the CorrectField field of described PTP message described time of delay.
Described nanosecond form timestamp be 16 bit nanosecond timestamp.
The timestamp that adds described second nanosecond form be 32 bps add 30 bit nanosecond timestamp.
The present invention also provides a kind of system that realizes accurate time stamp in a plurality of MAC, comprises the delivery unit of receiving element, Inbound engine unit, outgoing direction engine unit and the MAC controller of PTP engine unit, MAC controller, wherein,
Described PTP engine unit sends the timestamp of nanosecond form to receiving element and the delivery unit of described MAC controller, and to Inbound engine unit and outgoing direction engine unit, sends the timestamp that add nanosecond form second respectively;
Described Inbound engine unit is according to the described timestamp that adds nanosecond form second catching, with the timestamp of described nanosecond form, and the timestamp that second add nanosecond form of the receiving element that calculates MAC controller when receiving PTP message;
Described outgoing direction engine unit calculates residence time with timestamp that described Inbound engine unit calculates and stabs according to adding the timestamp of nanosecond form the described second catching, described residence time stamp is squeezed into the field of PTP message, or the timestamp that adds nanosecond form second directly described outgoing direction engine unit being caught is squeezed into the field of PTP message;
The delivery unit of described MAC controller according to catch nanosecond form timestamp, pass over outgoing direction engine nanosecond form timestamp, calculate stamp time of delay of the transmission end of described outgoing direction engine and described MAC controller, and squeeze into the respective field of PTP message.
Preferably, carry out time difference adjustment and drift adjustment in described PTP engine unit, the timestamp that adds nanosecond form second after being adjusted, adopts the mode of broadcast step by step to send the timestamp of nanosecond form to receiving terminal and the transmission end of MAC controller.
Also comprise packet buffer unit, the PTP message for after the processing of temporary described Inbound engine unit, reads for described outgoing direction engine unit.
The invention has the beneficial effects as follows: (1) the present invention can realize precision up to other PTP protocol specification of nanosecond; (2) adopt the mode transmitting time stamp of broadcast step by step, greatly reduce the bit wide of bus, reduce cabling complexity, also saved use cost simultaneously.
Accompanying drawing explanation
Fig. 1 is that the present invention realizes the schematic flow sheet of the method for accurate time stamp in a plurality of MAC;
Fig. 2 is that PTP engine of the present invention is at the theory structure schematic diagram of chip internal transmitting time stamp;
Fig. 3 realizes the structural representation of the system of accurate time stamp in a plurality of MAC of the present invention.
Embodiment
Below in conjunction with accompanying drawing of the present invention, the technical scheme of the embodiment of the present invention is carried out to clear, complete description.
A kind of disclosed method that realizes accurate time stamp in a plurality of MAC, for improving the time precision of PTP protocol synchronization.As shown in Figure 1, comprise the following steps:
Shown in Fig. 2, the chips of Ethernet exchange of take illustrates embodiment of the present invention as example, and the chips of Ethernet exchange shown in figure comprises 48 MAC controller (MAC), concentrated Perfect Time synchronous protocol engine (PTP engine), Inbound processing engine and an outgoing direction processing engine.PTP engine internal have a precision up to nanosecond according to the reference clock frequency free counter (FRC) that carries out freely counting of input, also be useful on drift adjustment (Drift Adjust) and the time difference adjustment (Offset Adjust) of correcting the local frequency deviation with reference to crystal oscillator, time difference is adjusted for compensating local zone time and the difference of far-end standard time, and the time value after being finally adjusted is applied to receive and delivery time time stamp.
In PTP engine, drift about and adjust and time difference adjustment, thereby get the timestamp that adds nanosecond form second after adjustment, in the present embodiment, the timestamp that add nanosecond form second be 32 bps add 30 bit nanosecond timestamp, nanosecond form timestamp be 16 bit nanosecond timestamp.Concrete acquisition process is: FRC beated in each kernel clock cycle, accordingly will increase the step-length that can join nanosecond, when nanosecond, value reached 10 9 power, will be to carry second, and nanosecond zero clearing, and then add that nanosecond position obtains adding the timestamp of nanosecond form second.For example, when interior nuclear clock is 125Mhz, it is 8 that step-length is set, and 125M kernel of FRC experience, after the clock cycle, will count down to 1 second.
PTP engine has been adjusted after timestamp, sends the timestamp of nanosecond form in each MAC, and to Inbound engine and outgoing direction engine, sends the timestamp that add nanosecond form second respectively.As shown in Figure 2, in order to reduce the crowded of chip rear end wiring, the present invention adopts the mode of broadcast step by step, and by nanosecond, the timestamp of form is broadcast in 48 all MAC.Be specially: PTP engine by 16 bit nanosecond form timestamp be broadcast in all QuadMAC modules (in figure referred to as QM module), 32 bps are added simultaneously 30 bit nanosecond form timestamp be broadcast to respectively in Inbound engine and outgoing direction engine, preferably, in present embodiment, described QM module is provided with 12 altogether, corresponding 4 MAC independently of each QM module.
Preferably, PTP message the receiving terminal of MAC controller catch 16 bit nanosecond form timestamp, and enter and in Inbound engine, carry out timestamp processing.
Preferably, described Inbound engine according to 32 bps that catch add 30 bit nanosecond form timestamp, with 16 bit nanosecond form timestamp, 32 bps of the receiving terminal that calculates MAC controller when receiving PTP message add 30 bit nanosecond form timestamp.
Step 4, in outgoing direction engine, catch the described timestamp that adds nanosecond form second, with the timestamp that adds nanosecond form second calculating in step 3, calculate residence time stamp, described residence time stamp is squeezed into the field of PTP message, or the timestamp that adds nanosecond form second directly described outgoing direction engine being caught is squeezed into the field of PTP message;
Preferably, described outgoing direction engine catch 32 bps add 30 bit nanosecond form timestamp and step 3 in 32 bps that calculate add 30 bit nanosecond form timestamp, calculate residence time stamp, described residence time stamp is squeezed into the CorrectField field of PTP message, or the timestamp that adds nanosecond form second directly described outgoing direction engine being caught is squeezed into the Timestamp field of PTP message.
Step 5, according to the transmission end of MAC controller, catch nanosecond form timestamp, pass over outgoing direction engine nanosecond form timestamp, calculate the time of delay of the transmission end of described outgoing direction engine and described MAC controller, and squeeze into the respective field of PTP message.
Preferably, according to MAC TX, catch 16 bit nanosecond form timestamp, with outgoing direction engine pass over 16 bit nanosecond form timestamp, calculate the time of delay between described outgoing direction engine and described MAC TX, and squeeze into the CorrectField field of PTP message.
The present invention has also disclosed a kind of timestamp treatment system, as shown in Figure 3, the delivery unit (MAC TX) that comprises receiving element (MAC RX), Inbound engine unit, packet buffer unit, outgoing direction engine unit and the MAC controller of PTP engine unit, MAC controller.In described PTP engine unit, carry out time difference adjustment and drift adjustment, the timestamp that adds nanosecond form second after being adjusted, adopt the mode of broadcast step by step to send the timestamp of nanosecond form to receiving element and the delivery unit of described MAC controller, and to Inbound engine unit and outgoing direction engine unit, send the timestamp that add nanosecond form second respectively.
Described Inbound engine unit is according to the described timestamp that adds nanosecond form second catching, with the timestamp of described nanosecond form, and the timestamp that second add nanosecond form of the receiving element that calculates MAC controller when receiving PTP message; Described outgoing direction engine unit calculates residence time with timestamp that described Inbound engine unit calculates and stabs according to adding the timestamp of nanosecond form the described second catching, described residence time stamp is squeezed into the CorrectField field of PTP message, or the timestamp that adds nanosecond form second directly described outgoing direction engine unit being caught is squeezed into the Timestamp field of PTP message.
The delivery unit of described MAC controller according to catch nanosecond form timestamp, pass over outgoing direction engine nanosecond form timestamp, calculate stamp time of delay of the transmission end of described outgoing direction engine and described MAC controller, and squeeze into the CorrectField field of PTP message.
Technology contents of the present invention and technical characterictic have disclosed as above; yet those of ordinary skill in the art still may be based on teaching of the present invention and announcements and are done all replacement and modifications that does not deviate from spirit of the present invention; therefore; protection range of the present invention should be not limited to the content that embodiment discloses; and should comprise various do not deviate from replacement of the present invention and modifications, and contained by present patent application claim.
Claims (10)
1. in a plurality of MAC, realize a method for accurate time stamp, it is characterized in that, comprise the following steps:
Step 1, PTP engine sends the timestamp of nanosecond form to receiving terminal and the transmission end of MAC controller, and to Inbound engine and outgoing direction engine, sends the timestamp that add nanosecond form second respectively;
Step 2, PTP message catches the timestamp of described nanosecond form at the receiving terminal of MAC controller;
Step 3, the described timestamp that adds nanosecond form second catching according to Inbound engine, with the timestamp timestamp that second add nanosecond form of receiving terminal when receiving PTP message that calculate MAC controller of described nanosecond form;
Step 4, in outgoing direction engine, catch the described timestamp that adds nanosecond form second, with the timestamp that adds nanosecond form second calculating in step 3, calculate residence time stamp, described residence time stamp is squeezed into the field of PTP message, or the timestamp that adds nanosecond form second directly described outgoing direction engine being caught is squeezed into the field of PTP message;
Step 5, according to the transmission end of MAC controller, catch nanosecond form timestamp, pass over outgoing direction engine nanosecond form timestamp, calculate stamp time of delay of the transmission end of described outgoing direction engine and described MAC controller, and squeeze into the respective field of PTP message.
2. the method that realizes accurate time stamp in a plurality of MAC according to claim 1, it is characterized in that, in described step 1, in PTP engine, carry out time difference adjustment and drift adjustment, add the timestamp of nanosecond form the second after being adjusted, and adopts the mode of broadcast step by step to send the timestamp of described nanosecond form to receiving terminal and the transmission end of MAC controller.
3. the method that realizes accurate time stamp in a plurality of MAC according to claim 2, it is characterized in that, described PTP engine sends the timestamp of described nanosecond form to each MAC controller by first order QuadMAC module, the corresponding a plurality of independently MAC controller of each QuadMAC module.
4. the method that realizes accurate time stamp in a plurality of MAC according to claim 1, it is characterized in that, the field of described PTP message comprises Timestamp field and CorrectField field, described residence time stamp is squeezed into the CorrectField field of PTP message, and the timestamp that adds nanosecond form second that described outgoing direction engine catches is squeezed into the Timestamp field of PTP message.
5. the method that realizes accurate time stamp in a plurality of MAC according to claim 1, is characterized in that, stabs the CorrectField field of squeezing into described PTP message described time of delay.
6. according to the method for accurate time stamp that realizes in a plurality of MAC described in any one in claim 1～3, it is characterized in that, described nanosecond form timestamp be 16 bit nanosecond timestamp.
7. the method that realizes accurate time stamp in a plurality of MAC according to claim 1 and 2, is characterized in that, the timestamp that adds described second nanosecond form be 32 bps add 30 bit nanosecond timestamp.
8. in a plurality of MAC, realize a system for accurate time stamp, it is characterized in that, comprise the delivery unit of receiving element, Inbound engine unit, outgoing direction engine unit and the MAC controller of PTP engine unit, MAC controller, wherein,
Described PTP engine unit sends the timestamp of nanosecond form to receiving element and the delivery unit of described MAC controller, and to Inbound engine unit and outgoing direction engine unit, sends the timestamp that add nanosecond form second respectively;
Described Inbound engine unit is according to the described timestamp that adds nanosecond form second catching, with the timestamp of described nanosecond form, and the timestamp that second add nanosecond form of the receiving element that calculates MAC controller when receiving PTP message;
Described outgoing direction engine unit calculates residence time with timestamp that described Inbound engine unit calculates and stabs according to adding the timestamp of nanosecond form the described second catching, described residence time stamp is squeezed into the field of PTP message, or the timestamp that adds nanosecond form second directly described outgoing direction engine unit being caught is squeezed into the field of PTP message;
The delivery unit of described MAC controller according to catch nanosecond form timestamp, pass over outgoing direction engine nanosecond form timestamp, calculate stamp time of delay of the transmission end of described outgoing direction engine and described MAC controller, and squeeze into the respective field of PTP message.
9. the system that realizes accurate time stamp in a plurality of MAC according to claim 8, it is characterized in that, in described PTP engine unit, carry out time difference adjustment and drift adjustment, the timestamp that adds nanosecond form second after being adjusted, adopts the mode of broadcast step by step to send the timestamp of nanosecond form to receiving terminal and the transmission end of MAC controller.
10. the system that realizes accurate time stamp in a plurality of MAC according to claim 8, is characterized in that, also comprises packet buffer unit, and the PTP message for after the processing of temporary described Inbound engine unit, reads for described outgoing direction engine unit.
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