CN105574810B - For the insufficient Image Real-time Transmission fault-tolerance approach of picture system bus bandwidth - Google Patents
For the insufficient Image Real-time Transmission fault-tolerance approach of picture system bus bandwidth Download PDFInfo
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- 238000006243 chemical reaction Methods 0.000 claims description 3
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Classifications
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T1/00—General purpose image data processing
- G06T1/20—Processor architectures; Processor configuration, e.g. pipelining
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T1/00—General purpose image data processing
- G06T1/60—Memory management
Abstract
The invention discloses one kind to be used for the insufficient Image Real-time Transmission fault-tolerance approach of picture system bus bandwidth, this method utilizes asynchronous FIFO bridge system clock domain and image transmitting clock domain, complete the safe transmission of data, when recording transmission image using bidirectional counter, late real time data and invalid data completes image fault-tolerance processing by abandoning invalid data, influence of the frame losing to image frame per second is avoided, guarantees the real-time Transmission of image.
Description
Technical field
The present invention relates to computer hardware fields, espespecially a kind of to pass in real time for the insufficient image of picture system bus bandwidth
Defeated fault-tolerance approach.
Background technique
In a picture system, image show be human-computer interaction basis, it is also most important, directly affect user experience
Degree.And smooth image in real time shows it is to lean on the accurate errorless transmission of image to do to guarantee.
System is more by bus apparatus, Bus Clock Rate is low etc. that factors are influenced when one, will limit system bus
Bandwidth.When bandwidth deficiency, it is easy to cause bus apparatus to be robbed less than bus, can not store in equipment and read from DRAM etc.
Data, when image is exported according to fixed picture format, image data is interrupted suddenly, when equipment gets bus, has had been subjected to transmission
The time of this group of data will cause output image mistake, that is, the space of data if again sent data at this time
Mapping error.And by error diffusion into subsequent image, if the picture of error discarded, the frame of image will be reduced
Rate.And a reliable picture system, it must be smooth, real-time, stable that image, which is shown,.
Summary of the invention
It is real-time for the insufficient image of picture system bus bandwidth that in order to solve the above technical problem, the present invention provides one kind
Transmission error tolerance method, of the invention can solve for the insufficient Image Real-time Transmission fault-tolerance approach of picture system bus bandwidth are existing
There is the problem of technology.
Technical solution of the present invention provides a kind of for the fault-tolerant side of the insufficient Image Real-time Transmission of picture system bus bandwidth
Method comprising following steps:
1) asynchronous FIFO converts image data to image transmitting clock domain from bus clock domain, and stores the institute after conversion
State image data；
2) transmission error tolerance module expires state every the sky that first time interval reads the asynchronous FIFO；When described asynchronous
When FIFO is that non-null states and the transmission error tolerance module are in transmission state, the transmission error tolerance module is from the asynchronous FIFO
Middle reading and temporary described image data；When the asynchronous FIFO is dummy status, the transmission error tolerance module enters fault-tolerant shape
State, the transmission error tolerance module return to transmission state after carrying out fault-tolerant processing to described image data；
3) data transmission blocks read data from the transmission error tolerance module every the second time interval；When the biography
When defeated fault-tolerant module is in transmission state, the data that the data transmission blocks the are read institute temporary for the transmission error tolerance module
State image data；Described in when the transmission error tolerance module is in fault-tolerant state, the data that the data transmission blocks are read are
The filling data that the transmission error tolerance module generates.
Further improvement for the insufficient Image Real-time Transmission fault-tolerance approach of picture system bus bandwidth of the invention exists
Fault-tolerant processing is carried out specifically includes the following steps: the transmission error tolerance module to described image data in the transmission error tolerance module
Record the read volume for the filling data that the data transmission blocks are read；The transmission error tolerance module is read repeatedly at the same time
The sky of the asynchronous FIFO expires state, and when the asynchronous FIFO is non-null states, the transmission error tolerance module is from described asynchronous
It is read in FIFO and abandons image data；When the discarding amount of image data is equal to the read volume of filling data, the transmission is held
Mismatch block returns to transmission state.
Further improvement for the insufficient Image Real-time Transmission fault-tolerance approach of picture system bus bandwidth of the invention exists
In: the transmission error tolerance inside modules include a bidirectional counter, and when the read volume for filling data increases, the transmission is held
Mismatch block adds up to bidirectional counter；When the discarding amount of described image data increases, the transmission error tolerance module is to two-way
Counter carries out regressive.
Further improvement for the insufficient Image Real-time Transmission fault-tolerance approach of picture system bus bandwidth of the invention exists
In: when the numerical value of the bidirectional counter is greater than the fault-tolerant thresholding, the transmission error tolerance module issues interrupt signal.
Further improvement for the insufficient Image Real-time Transmission fault-tolerance approach of picture system bus bandwidth of the invention exists
In: the bit wide of the bidirectional counter is variable.
Further improvement for the insufficient Image Real-time Transmission fault-tolerance approach of picture system bus bandwidth of the invention exists
In: the filling data are last read from the asynchronous FIFO when transmission error tolerance module is in transmission state
A image data.
Further improvement for the insufficient Image Real-time Transmission fault-tolerance approach of picture system bus bandwidth of the invention exists
In: the format of described image data is 400,422,444 or RGB.
Further improvement for the insufficient Image Real-time Transmission fault-tolerance approach of picture system bus bandwidth of the invention exists
In: when described image data include multiple components, save the component of described image data respectively using multiple asynchronous FIFOs.
The advantageous effects of technical solution of the present invention are as follows: when image data because bus bandwidth deficiency can not be sent on time
When, into image data, insertion filling data ensure that the real-time and height of image so that image transmitting will not interrupt
Frame per second.Suitable for picture system, as more than bus apparatus or bus bandwidth caused by the factors such as clock frequency is low is insufficient, equipment is robbed
The case where accounting for less than bus.
Detailed description of the invention
Fig. 1 is the structure of picture system of the present invention；
Fig. 2 is the structural block diagram of graphic transmission equipment of the present invention；
Fig. 3 is data flowchart of the invention；
Fig. 4 is the schematic diagram of normal picture frame；And
Fig. 5 is schematic diagram of the part image data after fault-tolerant processing in picture frame.
Specific embodiment
Illustrate embodiments of the present invention below by way of specific specific example, those skilled in the art can be by this specification
Other advantages and efficacy of the present invention can be easily understood for disclosed content.The present invention can also pass through in addition different specific realities
The mode of applying is embodied or practiced, the various details in this specification can also based on different viewpoints and application, without departing from
Various modifications or alterations are carried out under spirit of the invention.
It should be noted that this specification structure depicted in this specification institute accompanying drawings, ratio, size etc., only to cooperate
The bright revealed content of book is not intended to limit the invention enforceable limit so that those skilled in the art understands and reads
Fixed condition, therefore do not have technical essential meaning, the modification of any structure, the change of proportionate relationship or the adjustment of size, not
It influences still fall in disclosed technology contents under the effect of present invention can be generated and the purpose that can reach and obtain
In the range of capable of covering.Meanwhile it is cited such as "upper", "lower", "left", "right", " centre " and " one " in this specification
Term is merely convenient to being illustrated for narration, rather than to limit the scope of the invention, the change of relativeness or tune
It is whole, under the content of no substantial changes in technology, when being also considered as the enforceable scope of the present invention.
It introduces with reference to the accompanying drawing of the invention for the fault-tolerant side of the insufficient Image Real-time Transmission of picture system bus bandwidth
Method.
In picture system as shown in Figure 1, including data storage device 10, for display device image signal transmission
Graphic transmission equipment 11 and other multiple bus apparatus 12.Data storage device 10, graphic transmission equipment 11 and bus are set
For 12 equal carries a to bus 13.Image data is sent to graphic transmission equipment by bus 13 by data storage device 10
11.There can only be an equipment to occupy bus 13 in synchronization.
At runtime, image data is sent to image transmitting by bus to schedule and set by data storage device 10
Standby 11.But when the equipment of 13 carry of bus is more, 13 bandwidth of bus can generate sporadic deficiency.This will lead to data storage
Equipment 10 can not rob in time and account for bus 13, and then cause graphic transmission equipment that can not receive image data on time.
As shown in Fig. 2, described image transmission device 11 includes that asynchronous FIFO 20, transmission error tolerance module 30 and data send mould
Block 40, described image data are from the asynchronous FIFO through the transmission error tolerance module transfer to the data transmission blocks.Into one
Step ground further includes that a bus reads data module and a write-in asynchronous FIFO between the bus 13 and the asynchronous FIFO 20
Module；Described image data read data module and said write asynchronous FIFO module transfer through the bus from the bus 13
To the asynchronous FIFO 20；Said write asynchronous FIFO module expires state write-in picture number according to the sky of the asynchronous FIFO 20
According to；Said write asynchronous FIFO module reads the write request of data module and the sky of the asynchronous FIFO 20 according to the bus
Full state, which is formed, is sent to the feedback that the bus reads data module, to read the image data from the bus 13.
In order to avoid above-mentioned condition, the invention proposes one kind to pass in real time for the insufficient image of picture system bus bandwidth
Defeated fault-tolerance approach, as shown in Figures 2 and 3, this method comprises the following steps:
1) image data is sent to asynchronous FIFO by bus 13 by data storage device 10.Asynchronous FIFO 20
(AsynFIFO, asynchronous First Input First Output) converts image data to image transmitting clock domain from bus clock domain, and stores
Image data after conversion.Bus clock domain is different with the clock frequency of image transmitting clock domain in the present embodiment, if directly
Connect by image data from bus clock domain be transmitted to image transmitting clock domain will lead to signal transmission it is unreliable.Asynchronous FIFO 20 is
A kind of First Input First Output of cross clock domain, the entrance of asynchronous FIFO 20 run on bus clock domain, and outlet runs on image
Transmit clock domain.
Asynchronous FIFO 20 cannot be only used for data cross clock domain transmission, inside can also cache part image data,
The caching function can overcome the problems, such as that of short duration bus bandwidth is insufficient.When 13 bandwidth of bus is normal, data storage device 10
Do not stop to transmit image data to asynchronous FIFO 20, so that asynchronous FIFO 20 is constantly in non-null states.But work as 13 bandwidth of bus
When insufficient for a long time, data storage device 10 temporarily can not transmit image data to asynchronous FIFO 20 by bus, asynchronous
After image data inside FIFO20 is all read, asynchronous FIFO 20 enters dummy status.The dummy status meeting one of asynchronous FIFO 20
Until directly continueing to that 13 bandwidth of bus restores normal.
2) transmission error tolerance module 30 expires state every the sky that first time interval reads asynchronous FIFO 20.When asynchronous FIFO 20
For non-null states and when transmission error tolerance module 30 is in transmission state, transmission error tolerance module 30 is read and temporary from asynchronous FIFO 20
Deposit image data.When asynchronous FIFO 20 is dummy status, transmission error tolerance module 30 enters fault-tolerant state, and transmission error tolerance module 30 is right
Image data returns to transmission state after carrying out fault-tolerant processing.
Specifically, transmission error tolerance module 30 is in transmission state when 13 bandwidth of bus is constantly in normal condition.At this time
Transmission error tolerance module 30 reads image data every first time interval from asynchronous FIFO, and the image data read is temporary
It is stored in register and is read for data transmission blocks 40.
When bus bandwidth deficiency, asynchronous FIFO 20 enters dummy status.Transmission error tolerance module 30 detects asynchronous FIFO 20
Enter fault-tolerant state after into dummy status.When in fault-tolerant state, transmission error tolerance module 30 saves filling data inside it and supplies
Data transmission blocks 40 are read, to guarantee that picture system will not malfunction because not receiving data on time.After bus bandwidth restores,
Received partial data is late ineffective image data to asynchronous FIFO 20 at first, and ineffective image data is filled data institute
Replace.In order to guarantee that the correctness of subsequent image data space reflection, transmission error tolerance module 30 can be by late invalid picture numbers
According to being abandoned.
Transmission error tolerance module 30 carries out fault-tolerant processing to image data specifically includes the following steps: transmission error tolerance module 30 will
Filling data are stored in its internal register and read for data transmission blocks 40, and transmission error tolerance module 30 records data and sends mould
The read volume for the filling data that block 40 is read；The sky that transmission error tolerance module 30 reads asynchronous FIFO 20 repeatedly at the same time is expired
State, when asynchronous FIFO 20 is non-null states, transmission error tolerance module 30 reads from asynchronous FIFO 20 and abandons invalid picture number
According to；When the discarding amount of ineffective image data is equal to the read volume of filling data, transmission error tolerance module 30 returns to transmission state.
3) data transmission blocks 40 read data from transmission error tolerance module 30 every the second time interval；When transmission error tolerance mould
When block 30 is in transmission state, the data that data transmission blocks 40 are read are the image data that transmission error tolerance module 30 is kept in；When
When transmission error tolerance module 30 is in fault-tolerant state, the data that data transmission blocks 40 are read are filling out for the generation of transmission error tolerance module 30
It makes up the number evidence.
It include a fault-tolerant unit 31 and reading data unit 32 inside transmission error tolerance module 30.Inside fault-tolerant unit 31
Comprising a bidirectional counter, the initial value of the bidirectional counter is 0.When the read volume for filling data increases, transmission error tolerance
Module 30 adds up to bidirectional counter；When the discarding amount of late image data increases, transmission error tolerance module 30 is to double
Regressive is carried out to counter.During transmission error tolerance module 30 carries out fault-tolerant processing, bidirectional counter usually first carries out tired
Add.After the recovery of 13 bandwidth of bus, transmission error tolerance module 30 reads and abandons late ineffective image data, at this time two-way meter
Count device gradually regressive.When the discarding amount of ineffective image data is equal to the read volume of filling data, under the numerical value of bidirectional counter
It is down to initial value 0.Transmission error tolerance module 30 can judge its working condition by the numerical value of bidirectional counter, work as bidirectional counter
Numerical value be 0 when, transmission error tolerance module 30 is in transmission state；When the numerical value of bidirectional counter is not equal to 0, transmission error tolerance mould
Block 30 is in fault-tolerant state.
Fault-tolerant unit 31 expires the number of state and data transmission blocks according to the numerical value of bidirectional counter, the sky of asynchronous FIFO
Reading data unit 32 is controlled according to request signal.Reading data unit 32 reads image data in fault-tolerant unit 31 from asynchronous FIFO,
And the data of reading are abandoned or cached.
Fault-tolerant thresholding is also preserved inside fault-tolerant unit 31.When the numerical value of bidirectional counter is greater than fault-tolerant thresholding, pass
Defeated fault-tolerant module 30 issues interrupt signal.System carries out local reset to graphic transmission equipment after receiving interrupt signal, loses
This frame image is abandoned, the transmission of next frame image, or other operations are carried out.In the present embodiment, filling data are that transmission is held
Mismatch block 30 is in the last one the effective image data read from asynchronous FIFO 20 when transmission state.Bidirectional counter
Bit wide it is variable, its bit wide can be extended or be reduced according to system practical application.Fault-tolerant thresholding itself can be according to figure
The requirement of image quality amount is modified.Requirement to picture quality is higher, and the numerical value of corresponding fault-tolerant thresholding is smaller.
In the present embodiment, the format of image data can be any one in 400,422,444 or RGB.Picture number
When according to including multiple components, multiple asynchronous FIFOs can be used to save the component of image data respectively.Method of the invention is suitable for
The image for transmitting various resolution ratio, common are: 1920 × 1080,1280 × 720 etc..
As shown in Figure 4 and Figure 5.Fig. 4 is the image data that data transmission blocks 40 issue when bus broadband continues normal.From
The address of image data is continuous known to Fig. 4, and no image data is filled data and is substituted.And Fig. 4 is shown in the middle part of picture frame
Schematic diagram of the sub-image data after fault-tolerant processing.Address is filled data by 13 and 14 image data and replaces in Fig. 5
Generation, filling data are image data 12.Correct address is written according to data address in other image datas.Although filling data meeting
Lead to the flaw of picture quality, but that fills data is written other image datas on time, it is ensured that picture number
According to can according to correct way carry out space reflection.It is supervised in such as security protection of the not high application scenarios of certain pairs of image quality requirements
This accidental flaw in the fields such as control, video communication is entirely acceptable.The pixel hangover of individual discrete than
The reset frame losing that frame structure malfunctions completely is far better.
The design is able to achieve in the insufficient situation of system bandwidth on different FPGA through experimental verification, real
When transmit the image of high frame per second, be fully able to that the loss of image data is avoided to show bring puzzlement to image, when frame per second is high
The flaw of image data can be covered.
The advantageous effects of technical solution of the present invention are as follows: when image data because bus bandwidth deficiency can not be sent on time
When, into image data, insertion filling data ensure that the real-time and height of image so that image transmitting will not interrupt
Frame per second.Suitable for picture system, as more than bus apparatus or bus bandwidth caused by the factors such as clock frequency is low is insufficient, equipment is robbed
The case where accounting for less than bus.
The above is only presently preferred embodiments of the present invention, not does limitation in any form to the present invention, though
So the present invention has been disclosed as a preferred embodiment, and however, it is not intended to limit the invention, any technology people for being familiar with this profession
Member, in the range of not departing from technical solution of the present invention, when the technology contents using the disclosure above make a little change or repair
Decorations are the equivalent embodiment of equivalent variations, but anything that does not depart from the technical scheme of the invention content, technology according to the present invention are real
Matter any simple modification, equivalent change and modification to the above embodiments, still fall within the range of technical solution of the present invention
It is interior.
Claims (7)
1. one kind is used for the insufficient Image Real-time Transmission fault-tolerance approach of picture system bus bandwidth, which is characterized in that described image
System includes data storage device and for the graphic transmission equipment to display device image signal transmission, the data storage
In equipment and described image transmission device carry a to bus, described image transmission device includes asynchronous FIFO, transmission error tolerance
Module and data transmission blocks；Image data is sent to the asynchronous FIFO by the bus by the data storage device,
Described image data from the asynchronous FIFO through the transmission error tolerance module transfer to the data transmission blocks, hold by the transmission
Wrong inside modules include a fault-tolerant unit and reading data unit；It include a bidirectional counter inside the fault-tolerant unit；
Wherein, described image real-time Transmission fault-tolerance approach the following steps are included:
1) asynchronous FIFO converts image data to image transmitting clock domain from bus clock domain, and stores the institute after conversion
State image data；
2) the transmission error tolerance module expires shape every the sky that first time interval reads the asynchronous FIFO by its fault-tolerant unit
State, the fault-tolerant unit simultaneously expire state and the data according to the sky of the numerical value of the bidirectional counter, the asynchronous FIFO
The data request signal of sending module controls the reading data unit；The reading data unit is according to the control of the fault-tolerant unit
Image data is read from the asynchronous FIFO, and the data of reading are abandoned or cached；When described asynchronous
For non-null states and when the transmission error tolerance module is in transmission state, the transmission error tolerance module passes through it and reads data sheet FIFO
Member is read from the asynchronous FIFO and temporary described image data；The transmission error tolerance when the asynchronous FIFO is dummy status
Module enters fault-tolerant state, and the transmission error tolerance module returns to transmission state after carrying out fault-tolerant processing to described image data；Its
In, the transmission error tolerance module includes: to the step of image data progress fault-tolerant processing
When defining the transmission error tolerance module and being in transmission state, what the reading data unit was read from the asynchronous FIFO
The last one effective image data is filling data；The filling data are stored in posting for its inside by the transmission error tolerance module
Storage is read for the data transmission blocks, and the transmission error tolerance module records the filler that the data transmission blocks are read
According to read volume；The sky that the fault-tolerant unit reads the asynchronous FIFO repeatedly at the same time expires state, when the asynchronous FIFO
When for non-null states, the transmission error tolerance module reads from the asynchronous FIFO and abandons ineffective image data；When invalid figure
When being equal to the read volume of filling data as the discarding amount of data, the transmission error tolerance module returns to transmission state；
3) data transmission blocks read data from the reading data unit of the transmission error tolerance module every the second time interval；
When the transmission error tolerance module is in transmission state, the data that the data transmission blocks are read are the transmission error tolerance module
Temporary described image data；When the transmission error tolerance module is in fault-tolerant state, the number of the data transmission blocks reading
According to for the filling data.
2. being used for the insufficient Image Real-time Transmission fault-tolerance approach of picture system bus bandwidth, feature as described in claim 1
Be: in the step 2), the numerical value initial value of the bidirectional counter is 0, described when the read volume for filling data increases
Transmission error tolerance module adds up to bidirectional counter；When the discarding amount of described image data increases, the transmission error tolerance mould
Block carries out regressive to bidirectional counter；The transmission error tolerance module is enabled to judge its work shape by the numerical value of the bidirectional counter
State, when the numerical value of bidirectional counter is 0, the transmission error tolerance module is in transmission state；When bidirectional counter numerical value not
When equal to 0, the transmission error tolerance module is in fault-tolerant state.
3. being used for the insufficient Image Real-time Transmission fault-tolerance approach of picture system bus bandwidth, feature as claimed in claim 2
Be: when the numerical value of the bidirectional counter is greater than the fault-tolerant thresholding, the transmission error tolerance module issues interrupt signal, holds
The numerical value of wrong thresholding is determined according to the requirement to picture quality.
4. being used for the insufficient Image Real-time Transmission fault-tolerance approach of picture system bus bandwidth, feature as claimed in claim 2
Be: the bit wide of the bidirectional counter is variable.
5. being used for the insufficient Image Real-time Transmission fault-tolerance approach of picture system bus bandwidth, feature as described in claim 1
Be: the format of described image data is 400,422,444 or RGB.
6. being used for the insufficient Image Real-time Transmission fault-tolerance approach of picture system bus bandwidth, feature as described in claim 1
It is: when described image data include multiple components, saves the component of described image data respectively using multiple asynchronous FIFOs.
7. being used for the insufficient Image Real-time Transmission fault-tolerance approach of picture system bus bandwidth, feature as described in claim 1
It is: further includes that a bus reads data module and a write-in asynchronous FIFO mould between the bus and the asynchronous FIFO
Block；Described image data read data module and said write asynchronous FIFO module transfer to institute through the bus from the bus
State asynchronous FIFO；Said write asynchronous FIFO module expires state write-in image data according to the sky of the asynchronous FIFO；It is described to write
The sky for entering write request and the asynchronous FIFO that asynchronous FIFO module reads data module according to the bus is expired state and is formed
It is sent to the feedback that the bus reads data module, to read the image data from the bus.
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| CN107040784B (en) * | 2017-03-22 | 2020-12-15 | 深圳市中航世星科技有限公司 | Video buffering processing method, system and device |
| CN110082752B (en) * | 2019-04-23 | 2020-11-03 | 四川九洲空管科技有限责任公司 | Fault-tolerant processing method for trace point data based on secondary radar interrogator |
| CN114449192B (en) * | 2020-11-04 | 2024-02-27 | 格科微电子（上海）有限公司 | Virtual active image acquisition device, data transmission method thereof, storage medium and terminal |
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