CN106933759A - A kind of interruption communication means based on CPCI backboards - Google Patents
A kind of interruption communication means based on CPCI backboards Download PDFInfo
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- CN106933759A CN106933759A CN201511020711.6A CN201511020711A CN106933759A CN 106933759 A CN106933759 A CN 106933759A CN 201511020711 A CN201511020711 A CN 201511020711A CN 106933759 A CN106933759 A CN 106933759A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/14—Handling requests for interconnection or transfer
- G06F13/20—Handling requests for interconnection or transfer for access to input/output bus
- G06F13/24—Handling requests for interconnection or transfer for access to input/output bus using interrupt
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/38—Information transfer, e.g. on bus
- G06F13/42—Bus transfer protocol, e.g. handshake; Synchronisation
- G06F13/4204—Bus transfer protocol, e.g. handshake; Synchronisation on a parallel bus
- G06F13/4221—Bus transfer protocol, e.g. handshake; Synchronisation on a parallel bus being an input/output bus, e.g. ISA bus, EISA bus, PCI bus, SCSI bus
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2213/00—Indexing scheme relating to interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F2213/0024—Peripheral component interconnect [PCI]
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2213/00—Indexing scheme relating to interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F2213/24—Interrupt
- G06F2213/2414—Routing of interrupt among interrupt handlers in processor system or interrupt controller
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- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Techniques For Improving Reliability Of Storages (AREA)
Abstract
The invention discloses a kind of interruption communication means based on CPCI backboards, belong to vehicle communication technical field, solve traditional interrupt mode communication means and be susceptible to data transmission fault and confusion, the relatively low technical problem of reliability and stability.The method includes：Data of first communication unit in the first memory cell be read after to the first communication data is write in the first memory cell, the first communication data includes：Data message and read data indication information, or to the first communication data is write in the first memory cell after data of first communication unit in the first and second memory cell are read, the first communication data includes：Write data indication information；Indicate the second communication unit that the reading data indication information is read from the first memory cell or write data indication information by interrupting；Second communication unit reads data message according to data indication information is read from the first memory cell, or writes data into the second memory cell according to data indication information is write.
Description
Technical field
The present invention relates to vehicle communication technical field, specifically, it is related to a kind of interruption based on CPCI backboards
Communication means.
Background technology
With the development of train high speed, safe and comfortableization, increasing status information, control information
And diagnostic message etc. needs mutually to be transmitted between rolling stock, between each electrical equipment.Due to train communication network
Network (Train Communication Network, TCN) medium control mode, communication service and in real time
The aspects such as property suffer from particular advantages, therefore are widely used.In related application item, MVB
The information that the veneers such as plate, WTB plates, I O board, logout plate are collected is all by the CPCI backboards in cabinet
Bus and CPU master control borads are realized interact, and CPU master control borads are the main equipment of cpci bus, other veneers be from
Equipment.
General based in the cpci bus communication pattern for interrupting, CPU master control borads and from plate CPU all to same
A piece of dual port RAM is written and read operation, i.e., total by CPCI backboards when CPU master control borads send data
Line is write data into dual port RAM, then reads data from plate CPU using interrupt notification.In turn, from
During plate CPU can be also write data into a piece of dual port RAM by local bus, then using interrupt notification
CPU master control borads read data.So process the drawbacks of be：There are CPU master control borads and be in from plate CPU
One write dual port RAM and another in the state of dual port RAM is read, or CPU master control borads and from plate CPU
Simultaneously in the state of dual port RAM is write, it may appear that data read errors and data collision, cause data
Mistake and confusion so that the reliability of communication system is relatively low.
Therefore, need a kind of wrong and confusion for being prevented from data transfer badly, improve the base of reliability of communication system
In the interruption communication means of CPCI backboards.
The content of the invention
It is an object of the invention to provide a kind of interruption communication means based on CPCI backboards, with the tradition for solving
Interrupt mode communication means be susceptible to data transmission fault and confusion, the relatively low technology of reliability and stability
Problem.
The present invention provides a kind of interruption communication means based on CPCI backboards, and the method includes：
Data of first communication unit in the first memory cell be read after to writing in the first memory cell
One communication data, the first communication data of write-in includes：Data message and read data indication information, or first logical
Data of the letter unit in first the second memory cell are led to after being read to write-in first in the first memory cell
Letter data, the first communication data of write-in includes：Write data indication information；
Interrupt control unit indicates the second communication unit that the reading is read from the first memory cell by interrupting
According to configured information or write data indication information；
Second communication unit reads the data message according to data indication information is read from the first memory cell, or
The second communication data is write into the second memory cell according to data indication information is write；
Interrupt control unit indicates the first communication unit that the second communication is read from the second memory cell by interrupting
Data.
It is described to read data indication information and write data head of the data indication information record in first communication data,
The reading data indication information is read from the first memory cell or data are write in second communication unit and is indicated
The step of information, includes：
Second communication unit reads the data head of the first communication data from the first memory cell；
Second communication unit judges the type of the configured information recorded in the data head.
Include the step of the first communication data is write during first communication unit is to the first memory cell：
First communication unit reads empty full buffer status, is space-time in the empty full buffer status, to first
The first communication data is write in memory cell；
After the data writing is finished, be set to for the full buffer status of sky full by the first communication unit；
Include the step of second communication unit reads the data message from the first memory cell：The
After two communication units read the data message, the full buffer status of sky are set to sky；
Include the step of the second communication data is write the second memory cell by second communication unit：Second
After communication unit writes the second communication data, the full buffer status of sky are set to sky.
Indicate the second communication unit that the reading is read from the first memory cell by interrupting control unit is interrupted
Data indication information includes the step of write data indication information：
Control unit is interrupted to be sent for indicating the second communication unit to the first memory cell to the second communication unit
Read the first interrupt signal of data manipulation；
Second communication unit reads the reading data from the first memory cell and indicates letter according to the first interrupt signal
Cease or write data indication information.
Indicate the first communication unit that the is read from the second memory cell by interrupting in the interruption control unit
The step of two communication datas, includes：
Control unit is interrupted to be sent for indicating the first communication unit to the second memory cell to the first communication unit
Read the second interrupt signal of data manipulation；
First communication unit reads second communication data according to the second interrupt signal from the second memory cell.
Indicate the second communication unit that the reading is read from the first memory cell by interrupting control unit is interrupted
Data indication information includes the step of write data indication information：
Second communication unit reads the reading data indication information from the first memory cell or writes data and indicates letter
After breath, the first interrupt signal is removed.
Indicate the first communication unit that the is read from the second memory cell by interrupting in the interruption control unit
The step of two communication datas, includes：
After first communication unit reads second communication data from the second memory cell, remove second and interrupt letter
Number.
Interruption communication means provided in an embodiment of the present invention, is on the one hand divided into two passages by two-way interruption communication
Carry out respectively, it is to avoid communicating pair is all in same in the traditional interruption communication mode based on CPCI backboards
The situation that one caching is operated occurs, and then avoids the situation of the data corruption that this kind of situation causes, it is ensured that
The correctness of communication.On the other hand, interacted by the transmission of side's active management data, the opposing party's response management
The demand of side is operated accordingly, makes all of read-write operation be an orderly process, it is to avoid same
The error in data that multiple interrupt signals are produced and triggered simultaneously on individual data direction, and both sides are carrying out data behaviour
The interruption given due to other side when making and cause the situation that data manipulation is forced to terminate to occur, so as to ensure that communication
Correctly.
Other features and advantages of the present invention will illustrate in the following description, also, partial from specification
In become apparent, or by implement the present invention and understand.The purpose of the present invention and other advantages can pass through
Specifically noted structure is realized and obtained in specification, claims and accompanying drawing.
Brief description of the drawings
For the technical scheme in the clearer explanation embodiment of the present invention, below will be to needed for embodiment description
The accompanying drawing wanted does simple introduction：
Fig. 1 is the schematic flow sheet of interruption communication means provided in an embodiment of the present invention；
Fig. 2 is the implementation method schematic diagram of interruption communication means provided in an embodiment of the present invention；
Fig. 3 is the applicating flow chart of interruption communication means provided in an embodiment of the present invention；
Fig. 4 is the application schematic diagram of interruption communication means provided in an embodiment of the present invention.
Specific embodiment
Describe embodiments of the present invention in detail below with reference to drawings and Examples, whereby to the present invention how
Application technology means solve technical problem, and reach the implementation process of technique effect and can fully understand and real according to this
Apply.As long as it should be noted that do not constitute conflict, in each embodiment and each embodiment in the present invention
Each feature can be combined with each other, and the technical scheme for being formed is within protection scope of the present invention.
The embodiment of the present invention provides a kind of interruption communication means based on CPCI backboards, as shown in figure 1, the party
Method includes：Step 101, step 102, step 103 and step 104.In a step 101, the first communication unit
Data of the unit in the first memory cell be read after to writing the first communication data, first in the first memory cell
Communication data is data of first communication unit to be transmitted to the second communication unit, in the first communication data of write-in
Include：Data message and read data indication information, wherein, reading data indication information is used to need to carry out the
During the data transfer of one communication unit to the second communication unit direction, the second communication unit is indicated to the first communication unit
The first communication data that unit writes in the first memory cell carries out reading data manipulation, so as to complete the first communication unit
First data transfer to the second communication unit.Or first data of the communication unit in the first and second memory cell
It is read in backward first memory cell and writes the first communication data, the first communication data of write-in includes：Write number
According to configured information, data indication information is write for needing to carry out the second communication unit to the first communication unit direction
Data transfer when, indicate the second communication unit the second memory cell is carried out the second communication data write-in behaviour
Make, the second communication data is data of second communication unit to be transmitted to the first communication unit, so that at it
In step afterwards, the first communication unit can read the second communication data from the second memory cell, realize second
Data transfer of the communication unit to the first communication unit direction.
To data are write in the first memory cell carried out after the data in the first memory cell are read,
Data exactly in the first memory cell of last write-in have been read, even if the data of so this write-in are covered
The data for covering once also will not produce influence to communication process, likewise, the data write-in of the second memory cell
It is also such.
In a step 102, interruption control unit passes through to interrupt the second communication unit of instruction from the first memory cell
Read data indication information or write data indication information.More specifically, in this step, control is interrupted first
Unit processed is sent out after the data transfer that the first communication unit completes for the first memory cell to the second communication unit
Send the first interrupt signal for indicating the second communication unit to the first memory cell read data manipulation.So
Afterwards, the second communication unit read from the first memory cell according to first interrupt signal reading data indication information or
Write data indication information.The second communication unit read from the first memory cell it is described reading data indication information or
After writing data indication information, the second communication unit removes the first interrupt signal.
In step 103, the second communication unit reads institute according to data indication information is read from the first memory cell
Data message is stated, or the second communication data is write into the second memory cell according to data indication information is write.Needing
When carrying out the data transfer of the first communication unit to the second communication unit direction, the first communication unit is to the first storage
Included in the first communication data write in unit：Data message and read data indication information, data message is
Need to be transferred to the valid data of the second communication unit.Needing to carry out the second communication unit to the first communication unit
During the data transfer in direction, included in the first communication data：Write data indication information.
Further, read data indication information and write number of the data indication information record in first communication data
According to head, if the first communication unit needs to send data to the second communication unit, in the first communication data data head
Record has reading data indication information, and effective data message is carried after the first communication data data head.If first
Communication unit needs to read data from the second communication unit, then record writes number in the first communication data data head
According to configured information, effective data message is not carried after the first communication data data head.
Specifically, in step 103, first, it is single from the first storage according to the communication unit of interruptive command second
The data head of the first communication data is read in unit, then the second communication unit judges the instruction letter recorded in data head
The type of breath, that is, judge that configured information is to read data indication information or write data indication information, if reading data
Data manipulation is read in configured information, then the second communication unit execution, if writing data indication information, then the second communication
Unit performs data writing operation.
At step 104, interruption control unit passes through to interrupt the first communication unit of instruction from the second memory cell
Read the second communication data.More specifically, in this step, control unit is interrupted first to the first communication unit
Unit sends the second interrupt signal for indicating the first communication unit to the second memory cell read data manipulation,
Then according to second interrupt signal, the first communication unit reads the second communication data from the second memory cell,
And the second interrupt signal is removed after the completion of reading.
Interruption communication means provided in an embodiment of the present invention, is on the one hand divided into two passages by two-way interruption communication
Carry out respectively, for the first memory cell, the first communication unit can only be write can not be read, and the second communication unit can only
Reading can not be write；For the second memory cell, the first communication unit can only be read to write, and the second communication unit can only
Writing to read.Avoiding problems communicating pair in traditional interruption communication mode based on CPCI backboards all in
Occur to the same situation about being operated that caches, and then avoid the situation of the data corruption that this kind of situation causes,
Ensure that the correctness of communication.
On the other hand, the first communication unit control reads data indication information or to write by being sent to the second communication unit
Data indication information controls the read-write operation of the second communication unit, i.e., by the first communication unit active management data
Transmission interaction, the demand that the second communication unit responds the first communication unit is operated accordingly, logical first
After letter unit writes data, the second communication unit can just receive reading data indication information, and then go to read data,
And after the completion of the first communication unit once reads data manipulation on we, i.e. data in the second memory cell are by
After one communication unit reads, can just be sent to the second communication unit and write data indication information, and in the second communication unit
After unit writes data, just the data that the second communication unit writes can be read according to interrupting, so management can just make institute
Some read-write operations are an orderly processes, it is to avoid multiple interrupt signals are simultaneously on same data direction
The error in data for producing and triggering, and the interruption given due to other side when data manipulation is carried out of both sides and cause number
The situation for being forced to terminate according to operation occurs, so as to ensure that the correct of communication.
Further, in the specific stream of the interruption communication means based on CPCI backboards provided in an embodiment of the present invention
Journey, as shown in figure 3, including：Step 201, the first communication unit first reads the state of empty full register, sentences
Whether disconnected empty full register is empty, if the state of empty full register is full, repeat step 201 over time,
If the state of the full register of sky is sky, step 202 is performed.In this step, by the shape of the full register of sky
State represents whether data are read in the first memory cell state, and the data being stored in pass through if not being read
The full register of sky represents full state, it is to avoid the write-in again of data, if being read, then it represents that dummy status so as to
Indicating the write-in of data can be carried out.In step 202., the first communication unit writes data into the first storage list
In unit.In step 203, the full register of sky is set to full state by the first communication unit after data are write.
In step 204, interrupt control unit and produce interruption to the second communication unit, notify that its reads data.In step
In rapid 205, the response of the second communication unit is interrupted, and reads configured information, judges configured information type, that is, judge
First communication unit is that the communication unit of requirement second reads corresponding data or the corresponding data of write-in supply first
Communication unit reads, if the first communication unit is the communication unit of requirement second reads data, performs step 206,
If the first communication unit is requirement reads the data that the second communication unit sends, step 208 is performed.In step
In 206, the second communication unit reads the data of the first memory cell.In step 207, the second communication unit
Run through after data, remove and interrupt, and the full register of sky is set to dummy status.In a step 208, second leads to
Letter unit writes data into the second memory cell.In step 209, after the second communication unit writes data,
Remove and interrupt, the full register of sky is set to dummy status.In step 210, interrupt open close during control unit is produced
Know that the first communication unit reads data.In step 211, the first communication unit interrupts and indicates to read the second storage
Cell data.In the step 212, after the first communication unit reads data, remove and interrupt.
Binding closes specific embodiment below, the interruption communication party based on CPCI backboards provided the present invention
Method is further described in detail.Function in the method that the present invention is provided is applied into locomotive passes through from plate
CPCI core bus is carried out in the communication pattern of data interaction with CPU master control borads, as shown in Fig. 2 first is logical
Believing the function of unit can be realized by CPU master control borads, and the function of the second communication unit can be by from plate CPU realities
It is existing, first, second memory cell and interrupt the function of control unit and empty full register can be by from plate
Fpga chip is realized.
All kinds of from plate, the CPCI backplane communications with CPU master control borads are realized by PCI IP kernels, it is then right
Communication data carries out data storage, and by from plate local bus with from plate CPU (or other intermediate treatments
Module) communication, the function of PCI IP kernels is to realize the sequential of various pci bus orders.In the FPGA of veneer
Interior, first, second memory cell is typically realized with the FIFO or dual port RAM in FPGA pieces, also may be used
To use special cache chip.
As shown in figure 4, in one embodiment of the invention, binary channels caching is by twoport in FPGA
RAM A and RAM B realize that interrupting control unit function can be realized by interrupt control register in FPGA,
Correctness and reliability in order to improve communication of the invention, solves due to CPU master control borads and from plate CPU simultaneously
May bring data collision and confusion and cause communication mistake after operation dual port RAM and the multiple interrupt signals of appearance
The problem for losing, changes a piece of dual port RAM into two panels dual port RAM, i.e., a passage is become two passages,
Such as in dual port RAM A, CPU master control borads can only be write can not be read, and can only read to write from plate CPU；Double
In mouth RAM B, CPU master control borads can only be read to write, and can only be write from plate CPU to read.Avoiding problems
Both sides are all in the situation to carrying out write operation with a piece of dual port RAM.
Secondly, in interrupt operation, when CPU master control borads need to write data, empty full register is first read, is judged
Its state (default conditions are sky), if dummy status, then dual port RAM A can be write data into
In, the full register of sky is set to full state after writing, then notify to read from plate CPU by reading data indication information
Access evidence, after running through data from plate CPU, is set to dummy status, while remove interrupting by the full register of sky.
CPU master control borads read empty full register, are found to be after sky, can continue to write data again.So it is avoided that going out
Now from plate CPU when data are read, CPU master control borads initiate new data writing operation, while producing new interruption
To from plate CPU.
In another data path, by the way of CPU master control borads actively read data, i.e. CPU master control borads
When needing to read data, first produce and write the corresponding data that data indication information instruction enters needs reading from plate CPU write,
After being interrupted from plate CPU responses, required data are written in dual port RAM B, then produce interrupt notification
CPU master control borads read data, after CPU master control borads run through data, remove and interrupt.So avoid CPU
Master control borad and it is in one from plate CPU and is reading dual port RAM and another is writing the state of dual port RAM.
By CPU master control borads active request read data, from plate CPU it is passive send data to CPU master control borads,
Avoiding the occurrence of CPU master control borads mentioned above (or from plate CPU), to write data backward from plate CPU (or CPU
Master control borad) produce and interrupt and upset situation of the other side to the data corruption caused by the operation of dual port RAM,
So as to ensure that the correctness of communication.
Above measure is the generation of effective management interrupt signal under based on the communication pattern for interrupting, and
The wrong and confusion of data is prevented to the anti-collision treatment of the read-write operation of dual port RAM, it is ensured that CPCI
The accuracy of backplane communication.
Interruption communication means provided in an embodiment of the present invention, is on the one hand divided into two passages by two-way interruption communication
Carry out respectively, it is to avoid communicating pair is all in same in the traditional interruption communication mode based on CPCI backboards
The situation that one caching is operated occurs, and then avoids the situation of the data corruption that this kind of situation causes, it is ensured that
The correctness of communication.On the other hand, interacted by the transmission of side's active management data, the opposing party's response management
The demand of side is operated accordingly, makes all of read-write operation be an orderly process, it is to avoid same
The error in data that multiple interrupt signals are produced and triggered simultaneously on individual data direction, and both sides are carrying out data behaviour
The interruption given due to other side when making and cause the situation that data manipulation is forced to terminate to occur, so as to ensure that communication
Correctly.
While it is disclosed that implementation method as above, but described content is only to facilitate understand the present invention
And the implementation method for using, it is not limited to the present invention.Technology people in any the technical field of the invention
Member, on the premise of spirit and scope disclosed in this invention are not departed from, can be in the formal and details implemented
On make any modification and change, but scope of patent protection of the invention still must be with appending claims institute
The scope for defining is defined.
Claims (7)
1. a kind of interruption communication means based on CPCI backboards, it is characterised in that including：
Data of first communication unit in the first memory cell be read after to writing in the first memory cell
One communication data, the first communication data of write-in includes：Data message and read data indication information, or first logical
Data of the letter unit in the first and second memory cell are led to after being read to write-in first in the first memory cell
Letter data, the first communication data of write-in includes：Write data indication information；
Interrupt control unit indicates the second communication unit that the reading is read from the first memory cell by interrupting
According to configured information or write data indication information；
Second communication unit reads the data message according to data indication information is read from the first memory cell, or
The second communication data is write into the second memory cell according to data indication information is write；
Interrupt control unit indicates the first communication unit that the second communication is read from the second memory cell by interrupting
Data.
2. the interruption communication means based on CPCI backboards according to claim 1, it is characterised in that institute
State and read data indication information and write data head of the data indication information record in first communication data, described
Second communication unit reads the reading data indication information from the first memory cell or writes data indication information
Step includes：
Second communication unit reads the data head of the first communication data from the first memory cell；
Second communication unit judges the type of the configured information recorded in the data head.
3. the interruption communication means based on CPCI backboards according to claim 2, it is characterised in that
First communication unit includes to the step of writing the first communication data in the first memory cell：
First communication unit reads empty full buffer status, is space-time in the empty full buffer status, to first
The first communication data is write in memory cell；
After the data writing is finished, be set to for the full buffer status of sky full by the first communication unit；
Include the step of second communication unit reads the data message from the first memory cell：The
After two communication units read the data message, the full buffer status of sky are set to sky；
Include the step of the second communication data is write the second memory cell by second communication unit：Second
After communication unit writes the second communication data, the full buffer status of sky are set to sky.
4. the interruption communication means based on CPCI backboards according to any one of claims 1 to 3, it is special
Levy and be, indicate the second communication unit to be read from the first memory cell by interruption in interruption control unit described
Read data indication information or include the step of writing data indication information：
Control unit is interrupted to be sent for indicating the second communication unit to the first memory cell to the second communication unit
Read the first interrupt signal of data manipulation；
Second communication unit reads the reading data from the first memory cell and indicates letter according to the first interrupt signal
Cease or write data indication information.
5. the interruption communication means based on CPCI backboards according to claim 4, it is characterised in that
The interruption control unit indicates the first communication unit that the second communication is read from the second memory cell by interrupting
The step of data, includes：
Control unit is interrupted to be sent for indicating the first communication unit to the second memory cell to the first communication unit
Read the second interrupt signal of data manipulation；
First communication unit reads second communication data according to the second interrupt signal from the second memory cell.
6. the interruption communication means based on CPCI backboards according to claim 4, it is characterised in that
Interruption control unit reads the reading data from the first memory cell and refers to by interruption the second communication unit of instruction
Show information or include the step of writing data indication information：
Second communication unit reads the reading data indication information from the first memory cell or writes data and indicates letter
After breath, the first interrupt signal is removed.
7. the interruption communication means based on CPCI backboards according to claim 5, it is characterised in that
The interruption control unit indicates the first communication unit that the second communication is read from the second memory cell by interrupting
The step of data, includes：
After first communication unit reads second communication data from the second memory cell, remove second and interrupt letter
Number.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1261236A (en) * | 1999-01-19 | 2000-07-26 | 深圳市中兴通讯股份有限公司 | Method for transferring messages with dual control words |
| CN101655824A (en) * | 2009-08-25 | 2010-02-24 | 北京广利核系统工程有限公司 | Implementation method of double-port RAM mutual exclusion access |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1261236A (en) * | 1999-01-19 | 2000-07-26 | 深圳市中兴通讯股份有限公司 | Method for transferring messages with dual control words |
| CN101655824A (en) * | 2009-08-25 | 2010-02-24 | 北京广利核系统工程有限公司 | Implementation method of double-port RAM mutual exclusion access |
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