CN103441914A - Transmission method of AS5643 bus including isochronous data packet - Google Patents
Transmission method of AS5643 bus including isochronous data packet Download PDFInfo
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Abstract
The invention brings forward a transmission method of an AS5643 bus including an isochronous data packet, and aims at providing the transmission method that a 'soft' uncertainty problem caused by interleaved transmission of the isochronous data packet and an asynchronous data packet is avoided, and an AS5643 remote node which does not support isochronous transmission is compatible. The invention is realized via the following technical scheme: one data transmission frame period of the bus is divided into two parts of an isochronous time slot and an asynchronous time slot. The isochronous time slot comprises multiple cycle periods enabling the node to send multiple same channel isochronous data packets. The number of cycle start packets sent in the isochronous time slot is determined by time planning of the isochronous time slot. In the isochronous time slot, only the isochronous packets are transmitted; correspondingly, in the asynchronous time slot, only asynchronous packets are transmitted. Receiving and sending deviation time of the asynchronous packets relative to STOF packets is arranged in the asynchronous time slot. Periodical sending of the cycle start packets is closed in the asynchronous time slot. A mater control node (CC node) controls periodical sending and forbidden sending of the cycle start packets.
Description
Technical field
While the present invention relates in a kind of AS5643 bus contain etc. and the optimized transmission scheme of asynchronous transmission.
Background technology
IEEE-1394 is a kind of high performance serial bus technology (claiming again Firewire) at first proposed by apple (Apple) company, nineteen ninety-five IEEE formulates and has promulgated the IEEE-1394 standard, and this bussing technique at home and abroad all is widely used at present.When this universal serial bus can be supported to wait and asynchronous transmission simultaneously, the data transmission rate of gigabit can be provided, and not need main frame to be controlled.Development along with embedded system technology, requirement for system bus is also more and more higher, electronic system design teacher is faced with at a high speed, in real time, remote, be easy to the pressure that the demand such as connections is brought, the IEEE-1394 universal serial bus take its two-forty, etc. time/asynchronous transfer mode reach flexibly topological structure and provide a kind of effective optional solution as the engineer.Data/address bus is as the core of Integrated Electronic System, its reliability is the key that guarantees that the Integrated Electronic System function effectively realizes, but common IEEE-1394 bus can not meet high reliability and deterministic requirement, for this reason, AIAE American institute of automobile engineers has been done some restrictions and has been supplemented on the basis of IEEE-1394 bus, IEEE-1394 standard after improving is called AS5643, and has obtained successful Application in the F-35 of U.S. joint strike fighter.
Common IEEE-1394 agreement is to take 125 μ s as a cycle period, the mode that each cycle adopts the transmission circulation to start bag is carried out Network Synchronization, cycle and asynchronous periodicity when each cycle period is divided into again etc., wrap and asynchronous bag when when waiting and in asynchronous periodicity, transmission waits respectively.The AS5643 agreement has lengthened the time (as 10ms, 12.5ms etc.) of cycle period, because all adopting the asynchronous flow bag, the major part communication in the AS5643 agreement realizes, start the transmission of bag so cancelled circulation, and the mode that adopts CC node (main controlled node) to send STOF bag (frame starts bag) to carry out network node synchronous, for each Node configuration different transmitting-receiving transmission deviations, each node carries out data transmit-receive in strict accordance with the shift time with the STOF bag, thereby makes the transmission of data have certainty.
In synthetic aviation electronic system, usually the data that need the transmission tone video class, this class can adopt the mode of asynchronous flow bag to transmit to the less demanding data of transmission correctness, but, the AS5643 agreement is expanded the payload portions of asynchronous flow bag in the IEEE-1394 agreement, add some extra protocol data fields, adopted the asynchronous flow bag of AS5643 protocol definition to come the transmission tone video data can bring unnecessary expense, caused the waste of bus resource.
On the AS5643 bus, the another kind of scheme of transmission audio, video data is to adopt the isochronal data bag, situation for needs transmission isochronal data bag, the scheme of taking in the AS5643 agreement is: directly open the circulation periodically sent and start bag (the 125 μ s of take are the cycle), allow the mode that while waiting, bag and asynchronous bag interlock and transmit.On the AS5643 bus, transmit wait the time when bag and common IEEE-1394 etc. packet format identical (in the AS5643 agreement, stipulate wait the time bag there is no additional protocol data field).According to the AS5643 agreement, on bus, each node transmits data according to the shift time that starts bag with frame of setting, and arranging of shift time can allow the sending and receiving of data have more time determinability.Yet, Deng time bag, add needs to introduce circulation to start to wrap, and in the time of after circulation starts bag etc., bag can be tried to be the first and transmitted, accompanying drawing 4 is while containing in the AS5643 agreement etc. and the schematic diagram of asynchronous transmission, adopt this mode can make the current asynchronous flow packet generation of just preparing transmission postpone, transmission delay when in Fig. 4, the asynchronous transmission of node i is waited, and this time delay can produce cumulative effect, STOF bag and common asynchronous flow bag all may be delayed, finally can cause the data transmission period on the AS5643 bus uncertain, cause ' soft ' uncertain problem.When the asynchronous flow packet transmitted on bus is harsher to time requirement, ' soft ' of bus transfer uncertain normal operation that can affect whole system, even can have serious consequences.
Summary of the invention
While the present invention seeks to for existing AS5643 bus transfer etc., bag can bring probabilistic problem, a kind of bag and staggered transmission of asynchronous bag can avoid waiting the time is provided, avoids circulation to start the optimized transmission scheme of bag AS5643 remote node of transmission while taking bus resource, compatible do not support etc., can the AS5643 bus is deterministic introduces transmission while waiting down in advance not destroying.
Above-mentioned purpose of the present invention can obtain by following measures, the transmission method that comprises the isochronal data bag in a kind of AS5643 bus, there is following feature: time slot and two parts of asynchronous time slot when a transfer of data frame period of bus is divided into etc., a plurality of cycle periods that can make node send a plurality of same passage isochronal data bags have been comprised in its medium gap constantly, and the circulation sent in time slot when waiting starts to wrap quantity, during by grade, the time slot time planning is determined; Deng the time only transmit the isochronal data bag in time slot, correspondingly, only transmit asynchronous bag in asynchronous time slot, and the transmitting-receiving shift time that asynchronous bag starts bag with respect to frame all is arranged in asynchronous time slot; Close circulation and start the periodicity transmission of bag in asynchronous time slot, the periodicity that is started bag by the main controlled node controlled circulation on bus sends and forbids sending.
Time slot and two parts of asynchronous time slot when the above-mentioned optimized transmission scheme provided is divided into a frame period etc.Deng the time only transmit the isochronal data bag in time slot, for transmitted data amount enough wait the time bag, Deng the time comprised a plurality of cycle periods (125 μ s are a cycle period) in time slot, make node can send the isochronal data bag of a plurality of same passages, while waiting, the length of time slot can be arranged according to the needs of engineering reality; Correspondingly, only transmit asynchronous bag in asynchronous time slot, and the transmitting-receiving shift time that asynchronous bag starts bag with respect to frame all is arranged in asynchronous time slot, consider that the timed sending meeting that circulation starts to wrap takies bus resource, and can cause asynchronous transmission to produce postpones, thereby introducing uncertain problem, start the periodicity transmission of bag so closed circulation in asynchronous time slot, when the transmission in asynchronous time slot waits with nothing like this, the AS5643 bus transmission model of bag is identical, thereby has guaranteed the certainty of asynchronous transmission.Adopt this optimized transmission scheme, can have under deterministic prerequisite when introducing waits and transmit in maintenance AS5643 bus transfer, and Deng time transmission and asynchronous transmission, be independent of each other, thereby while avoiding waiting within a frame period, bag and asynchronous bag interlock and transmit ' soft ' uncertain problem brought.Transmission when this optimized transmission scheme has specially been opened up a time slot for grade, and asynchronous transmission can not be affected, so, meet in the bus network of this optimized transmission scheme, can directly access the common AS5643 node of transmission while not supporting to wait, the common AS5643 remote node of transmission while can compatible not support to wait.
The present invention has following beneficial effect:
Time slot and asynchronous time slot when the present invention divides for grade by a frame period of AS5643 bus, Deng the time bag when only transmission waits in time slot, only transmit asynchronous bag in asynchronous time slot, Deng the time and asynchronous transmission between be independent of each other, thereby bag and ' soft ' uncertain problem that the staggered transmission of asynchronous bag brings in the time of can avoiding waiting, make the asynchronous bag transmitted according to the skew of STOF bag on bus have time determinability.
The present invention when waiting in time slot ON cycle start the bag transmission, and the time span decision of the quantity that circulation starts bag time slot when waiting, can realize that within a frame period a plurality of isochronal data bags of transmission are to same passage, thus can guarantee to transmit within a frame period data volume enough wait the time wrap other node.
The present invention has closed the transmission that circulation starts bag in asynchronous time slot, can avoid circulation to start bag and take bus resource and the transmitting-receiving of asynchronous bag is caused to delay, thereby guarantee the certainty of asynchronous pack receiving and transmitting time.Owing to just existing circulation to start bag on time slot internal bus when waiting, do not circulate and start bag on the asynchronous time slot internal bus, so the transfer of data in asynchronous time slot is identical with the common AS5643 bus data transmission that only contains asynchronous bag.
Transmission when the present invention reserves a frame period a part of time slot and is exclusively used in etc., because the asynchronous transmission time all is arranged in asynchronous time slot, the impact of transmission when asynchronous transmission can not be subject to wait, so, the AS5643 remote node of transmission while not supporting to wait, the node compatibility of the transmission method that can propose with employing the present invention, while not supporting to wait, the AS5643 remote node of transmission can directly not be connected on the same local bus with the AS5643 node of the transmission method that meets the present invention's proposition.
The accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described.
Fig. 1 is the time slot allocation schematic diagram of transmission method proposed by the invention.
Fig. 2 is the schematic diagram of transmission method proposed by the invention.
The transfer of data flow process figure of CC node and remote node when Fig. 3 is employing transmission method of the present invention.
Fig. 4 is while containing in former AS5643 agreement etc. and the schematic diagram of asynchronous transmission
Embodiment
Consult Fig. 1.It is synchronous that the AS5643 bus adopts the STOF bag to carry out network node, and the CC node periodically sends the STOF bag on bus, and the time interval between two STOF bags is a frame period, and the length in frame period can be arranged according to requirement of engineering.When this transmission plan is divided into a frame period etc. and two parts of asynchronous time slot, the time span of two time slots and sequencing can be planned and be arranged according to requirement of engineering.Comprised a plurality of cycle periods that can make node send a plurality of same passage isochronal data bags in its medium gap constantly, and the circulation sent in time slot when waiting starts to wrap quantity, during by grade, the time slot time planning is determined.In Fig. 1 example time slot a kind of mode the preceding while waiting, only allow transmission isochronal data bag in time slot when waiting, only allow the asynchronous bag of transmission in asynchronous time slot, and asynchronous bag all is arranged in asynchronous time slot with respect to the transmitting-receiving shift time of STOF bag, thereby the transmission of two class packets has been assigned to two relatively independent time slots, do not exert an influence mutually, and etc. time transmission also use the AS5643 bus for the preallocated channel number of node.Deng the time and the specific implementation of asynchronous transmission as follows:
Consult Fig. 2.When waiting in time slot, circulation starts bag and take 125 μ s as cycle transmissions that circulate, and is responsible for circulation by the CC node and starts the periodicity transmission of wrapping.Deng the time time slot time span be set to the integral multiple of 125 μ s, and etc. the time only allow transmission isochronal data bag between each node in time slot, have the node that needs to send bag while waiting can carry out bus arbitration after starting bag and send while waiting wrapping circulation being detected.According to the IEEE-1394 agreement, an isochronal data bag that mails to same passage can only be arranged in a cycle period, during the waiting of the optimized transmission scheme proposed due to the present invention, time slot has comprised a plurality of cycle periods (125 μ s), so, wrap same passage in the time of can transmitting a plurality of the grade in time slot during the waiting of the transmission method proposed in the present invention, thereby can meet the application that the isochronal data transmission quantity is larger.
The present invention's periodicity that only in time slot, ON cycle starts bag when waiting sends, so complete after the transmission of STOF bag ON cycle immediately at the CC node, starts bag, and closes circulation when time slot finishes when waiting and start the periodicity transmission of wrapping.In asynchronous time slot, forbidden that circulation starts the transmission of bag, only allow the asynchronous bag of transmission in this time slot, and the transmitting-receiving transmission deviation of each node (time migration with respect to the STOF bag of stipulating in the AS5643 agreement) all is arranged in the time range of asynchronous time slot, the timesharing in asynchronous time slot of each node takies bus resource, there do not is the problem of seizing and postponing, can guarantee the certainty of transmission.
Have a CC node and a plurality of remote node on the AS5643 bus, the task that the CC node is born on bus with remote node is different, so corresponding bus operation is not identical yet.Below with example explanation CC and remote node, adopt the present invention to propose transmission method the time operating process, in the time of waiting in example, time slot is arranged on the frame period for the previous period, time slot is arranged on the scope that section At All Other Times also belongs to this patent when waiting.The optimized transmission scheme proposed according to the present invention, CC and remote node operating process separately is as follows:
Consult Fig. 3 (a).The CC node is born the cyclical transmission function of STOF bag, needs to arrange a frame period timer in the protocol processor of CC node, and after timing cycle arrives, the CC node starts the transmission of STOF bag, and ON cycle starts the transmission of bag subsequently.In time slot, between node, can carry out the transmission of isochronal data bag when waiting, and can transmit when a plurality of etc. and wrap same passage.Before transmitting when node waits, while at first needing through grade, the right to use of bus is obtained in arbitration, when having a plurality of nodes need to transmit the isochronal data bag, while waiting between node, the sequencing of bag transmission is uncertain, but it is predetermined needing the data volume of the isochronal data bag of transmission in the frame period, during according to grade, the large I of transmitted data amount is determined the time span of time slot while waiting.After when waiting, time slot finishes, the CC node should be closed the automatic transmission that circulation starts bag immediately, in asynchronous time slot, transmit asynchronous bag according to the transmitting-receiving transmission deviation arranged between each node (comprising CC node and a plurality of remote node), carry out again the transmission of STOF bag until asynchronous periodicity finishes rear CC node, so circulation repeatedly.
Consult Fig. 3 (b).It is benchmark that all operations of remote node all be take the STOF bag that the CC node sends, receive and dispatch operation according to the time migration with respect to the STOF bag, need to arrange the timer conter of skew computing time in the protocol processor of remote node, for the skew time trigger setting, receive and dispatch accordingly operation.Transmission time slot while entering after remote node is received STOF bag etc., remote node enters isochronal data pack receiving and transmitting pattern and carries out the transmitting-receiving of isochronal data bag, Deng the time time slot comprised a plurality of cycle periods, after a plurality of cycle periods, remote node can send a plurality of isochronal data bags to same passage, also can receive a plurality ofly to wrap during from the waiting of same node or different nodes.When the time migration with respect to STOF bag reaches etc. after slot length, remote node is switched to the asynchronous receiving-transmitting pattern immediately, remote node carries out the transmitting-receiving operation of asynchronous data packets according to the transmitting-receiving transmission deviation of setting, until asynchronous time slot finishes, again take moment of receiving STOF bag subsequently when benchmark waits and the transmitting-receiving operation of asynchronous data packets, so circulate repeatedly.
Claims (8)
1. the transmission method that comprises the isochronal data bag in an AS5643 bus, there is following feature: time slot and two parts of asynchronous time slot when a transfer of data frame period of bus is divided into etc., a plurality of cycle periods that can make node send a plurality of same passage isochronal data bags have been comprised in its medium gap constantly, and the circulation sent in time slot when waiting starts to wrap quantity, during by grade, the time slot time planning is determined, Deng the time only transmit the isochronal data bag in time slot, correspondingly, only transmit asynchronous bag in asynchronous time slot, and the transmitting-receiving shift time that asynchronous bag starts bag (STOF bag) with respect to frame all is arranged in asynchronous time slot, closing the periodicity that circulation starts bag and sending in asynchronous time slot, by the main controlled node on bus: the periodicity that the circulation of CC node control starts bag sends and forbids sending.
2. the transmission method that comprises the isochronal data bag in AS5643 bus as claimed in claim 1, it is characterized in that, the transmission of isochronal data bag and asynchronous data packets is assigned to two relatively independent time slots, and while waiting, the time span of time slot is set to the integral multiple of 125 μ s.
3. the transmission method that comprises the isochronal data bag in AS5643 bus as claimed in claim 1, is characterized in that, when waiting in time slot, circulation starts bag and take 125 μ s as cycle transmissions that circulate, and be responsible for circulation by the CC node and start the periodicity transmission of wrapping.
4. the transmission method that comprises the isochronal data bag in AS5643 bus as claimed in claim 1, it is characterized in that, Deng the time only allow transmission isochronal data bag between each node in time slot, the node that bag while need to send waiting arranged, detecting after circulation starts bag, carries out bus arbitration and sends bag while waiting.
5. the transmission method that comprises the isochronal data bag in AS5643 bus as claimed in claim 1, it is characterized in that, a frame period timer is set in the CC node, and after timing cycle arrives, CC starts the transmission of STOF bag, and ON cycle starts the transmission of bag subsequently.
6. the transmission method that comprises the isochronal data bag in AS5643 bus as claimed in claim 1, it is characterized in that, after when waiting, time slot finishes, the CC node closes by link layer controller is set the automatic transmission that circulation starts bag immediately, in asynchronous time slot, between each node, comprise that CC node and a plurality of remote node transmit asynchronous bag according to the transmitting-receiving transmission deviation arranged, carry out again the transmission of STOF bag until asynchronous periodicity finishes rear CC node, so circulation repeatedly.
7. the transmission method that comprises the isochronal data bag in AS5643 bus as claimed in claim 1, it is characterized in that, transmission time slot while entering after remote node is received STOF bag etc., remote node enters isochronal data pack receiving and transmitting pattern and carries out the transmitting-receiving of isochronal data bag, Deng the time time slot comprised a plurality of cycle periods, after a plurality of cycle periods, remote node can send a plurality of isochronal data bags to same passage, also can receive a plurality of isochronal data bags of sending from same node or different node.
8. the transmission method that comprises the isochronal data bag in AS5643 bus as claimed in claim 1, it is characterized in that, when the time migration with respect to STOF bag reaches etc. after slot length, remote node is switched to the asynchronous receiving-transmitting pattern immediately, remote node carries out the transmitting-receiving operation of asynchronous data packets according to the transmitting-receiving transmission deviation of setting, until asynchronous time slot finishes, again take subsequently moment of receiving the STOF bag when benchmark waits and the transmitting-receiving operation of asynchronous data packets, so circulate repeatedly.
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| CN104461982A (en) * | 2014-12-09 | 2015-03-25 | 中国航空工业集团公司第六三一研究所 | Timed transmission processing method and timed transmission processing circuit for 1394 bus event messages |
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| CN107786457A (en) * | 2017-09-15 | 2018-03-09 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | Fast Ethernet certainty high band wide data transmission method |
| CN107786457B (en) * | 2017-09-15 | 2020-11-20 | 西南电子技术研究所（中国电子科技集团公司第十研究所） | High-speed Ethernet deterministic high-bandwidth data transmission method |
| CN109547311A (en) * | 2018-11-16 | 2019-03-29 | 中国航空工业集团公司洛阳电光设备研究所 | A kind of transmission method of avionics system environment 1394B bus communication frame structure |
| CN110691020A (en) * | 2019-07-26 | 2020-01-14 | 陕西千山航空电子有限责任公司 | Data transmission method based on RapidIO bus |
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