CN118473628A - Skew elimination method and system and electronic equipment - Google Patents
Skew elimination method and system and electronic equipment Download PDFInfo
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Abstract
The invention provides a deflection eliminating method, a deflection eliminating system and electronic equipment, wherein the deflection eliminating system comprises a DPHY receiving end, a deflection eliminating device and a target terminal, the deflection eliminating device comprises a data detection unit and a data processing unit, M data lines are arranged between the data detection unit and the DPHY receiving end, and the data processing unit is respectively connected with the data detection unit and the target terminal; the data detection unit is used for writing the effective data transmitted by the DPHY receiving end through the ith target data line into the ith target FIFO; and the data processing unit is used for synchronously transmitting the data in all the target FIFOs to the target terminal when all the target FIFOs are not empty. The method can ensure that the target terminal receives the aligned data, namely, the data alignment work on the multi-item standard data line is completed, so that the accuracy and the stability of data transmission are ensured.
Description
Technical Field
The present invention relates to the field of integrated chips, and in particular, to a method and a system for deskewing, and an electronic device.
Background
MIPI (Mobile Industry Processor Interface, mobile industry processor interface standard) is the mainstream video transmission protocol specification in the mobile domain, its protocol layers are mainly DSI (Display Serial Interface) and CSI (Camera Serial Interface), and its physical layer mostly uses DPHY. The DPHY can employ one clock line (clock line) and multiple data lines (data lines). The design of multiple data lines can improve bandwidth. The DPHY receiving end uses the clock recovered by the clock line to sample the recovered data of the plurality of data lines.
However, as the bandwidth needs continuously rise, the clock frequency of the DPHY is also continuously increased, and the number of data lines of the DPHY is also continuously increased, so that the influence of skew (skew) among a plurality of data lines is increased, and the skew elimination technology is required to reduce the influence of the skew, so that the accuracy and stability of data transmission are ensured.
However, the current technology can only eliminate the skew between the clock line (clock line) and the single data line (data line), and can only ensure that the data collected on each data line is correct, but cannot ensure that the data between the data lines are aligned, which will affect the processing of the subsequent data.
Disclosure of Invention
It is an object of the present invention to provide a deskewing method, system and electronic device, which at least partially ameliorate the above problems.
In order to achieve the above object, the technical scheme adopted by the embodiment of the invention is as follows:
In a first aspect, an embodiment of the present invention provides a deskewing system, where the deskewing system includes a DPHY receiving end, a deskewing device, and a target terminal, where the deskewing device includes a data detection unit and a data processing unit, M data lines are disposed between the data detection unit and the DPHY receiving end, and the data processing unit is connected to the data detection unit and the target terminal respectively;
the data detection unit is used for writing the effective data transmitted by the DPHY receiving end through the ith target data line into the ith target FIFO;
The target data lines are any one of the M data lines, the target FIFO is the FIFO deployed in the data detection unit, and the number of the target data lines is the same as the number of the target FIFOs;
and the data processing unit is used for synchronously transmitting the data in all the target FIFOs to the target terminal when all the target FIFOs are not empty.
In a second aspect, an embodiment of the present invention provides a deskewing method applied to a deskewing apparatus, the method including;
Writing the effective data transmitted by the DPHY receiving end through the ith item mark data line into the ith target FIFO;
The target data line is any one data line between the skew eliminating device and the DPHY receiving end, the target FIFO is the FIFO deployed in the skew eliminating device, and the number of the target data lines is the same as that of the target FIFOs;
And when all the target FIFOs are not empty, synchronously transmitting the data in all the target FIFOs to the target terminal.
In a third aspect, an embodiment of the present invention provides an electronic device, including the above-described deskewing system.
Compared with the prior art, the skew eliminating method, the skew eliminating system and the electronic equipment provided by the embodiment of the invention comprise a DPHY receiving end, a skew eliminating device and a target terminal, wherein the skew eliminating device comprises a data detection unit and a data processing unit, M data lines are arranged between the data detection unit and the DPHY receiving end, and the data processing unit is respectively connected with the data detection unit and the target terminal; the data detection unit is used for writing the effective data transmitted by the DPHY receiving end through the ith target data line into the ith target FIFO; the target data lines are any one of M data lines, the target FIFO is a FIFO deployed in the data detection unit, and the number of the target data lines is the same as that of the target FIFOs; and the data processing unit is used for synchronously transmitting the data in all the target FIFOs to the target terminal when all the target FIFOs are not empty. The method can ensure that the target terminal receives the aligned data, namely, the data alignment work on the multi-item standard data line is completed, so that the accuracy and the stability of data transmission are ensured.
In order to make the above objects, features and advantages of the present invention more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a deskewing system according to an embodiment of the invention.
Fig. 2 is a timing diagram of alignment of data lines according to an embodiment of the present invention.
Fig. 3 is a schematic timing diagram of misalignment of data lines according to an embodiment of the present invention.
FIG. 4 is a second schematic diagram of a deskewing system according to an embodiment of the invention.
Fig. 5 is a schematic flow chart of a deskewing method according to an embodiment of the invention.
Fig. 6 is a second flowchart of a deskewing method according to an embodiment of the invention.
Fig. 7 is a third flowchart of a deskew method according to an embodiment of the present invention.
In the figure: 10-deskewing apparatus; 11-a data detection unit; 12-a data processing unit; 13-a configuration unit; a 20-DPHY receiving end; 30-target terminal; 40-control unit.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures. Meanwhile, in the description of the present invention, the terms "first", "second", and the like are used only to distinguish the description, and are not to be construed as indicating or implying relative importance.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
In the description of the present invention, it should be noted that, directions or positional relationships indicated by terms such as "upper", "lower", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or those that are conventionally put in use, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements to be referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present invention.
In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed", "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Some embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following embodiments and features of the embodiments may be combined with each other without conflict.
Referring to fig. 1, fig. 1 is a schematic diagram of a deskewing system according to an embodiment of the present invention.
The deskewing system comprises a DPHY receiving end 20, a deskewing device 10 and a target terminal 30, wherein the deskewing device 10 comprises a data detection unit 11 and a data processing unit 12, M data lines are arranged between the data detection unit 11 and the DPHY receiving end 20, and the data processing unit 12 is respectively connected with the data detection unit 11 and the target terminal 30.
The target terminal 30 is a CSI receiving end or a DSI receiving end. The data transmitted by the DPHY receiving end 20 is image data or control data, and M is greater than or equal to 2. In fig. 1, 4 data lines are taken as an example, but the number of data lines is not limited.
Referring to fig. 2, fig. 2 is a timing diagram of data line alignment according to an embodiment of the invention. In fig. 2, for example, 4 target data lines and one clock line, the 4 target data lines are respectively data_lane_0, data_lane_1, data_lane_2 and data_lane_3, and data_lane_i represents the i-number target data line. The data data_i is divided into 4 parts data_i_0, data_i_1, data_i_2, and data_0_3.data_i_0 data_i_1 data_i 1 data_Lane_1 data_Lane_2 and data and_lane_3. When the data on the data_Lane_0, the data_Lane_1, the data_Lane_2 and the data_Lane_3 are aligned, the accuracy and the stability of data transmission can be ensured.
However, in some scenarios, skew exists among multiple data lines, which causes data to be unable to correspond, and affects the accuracy and stability of data transmission. Specifically, referring to fig. 3, fig. 3 is a timing diagram of misalignment of data lines according to an embodiment of the present invention. In the case shown in fig. 3, the order of data transmission may vary, thereby affecting the accuracy and stability of data transmission.
In order to overcome the above problems, an alternative implementation manner is provided in the embodiments of the present invention, please refer to the following.
The data detection unit 11 is configured to write the valid data transmitted by the DPHY receiving end 20 through the ith destination FIFO in the ith destination FIFO.
The target data line is any one of the M data lines, and the target FIFO is a FIFO disposed in the data detection unit 11, as shown in fig. 1, and a plurality of FIFOs are disposed in the data detection unit 11. The number of target data lines is the same as the number of target FIFOs, and the effective data may be image data. The number of target data lines may be greater than or equal to 2.
The data processing unit 12 is configured to send the data in all the target FIFOs to the target terminal 30 synchronously when all the target FIFOs are not empty.
It should be noted that, the data processing unit 12 may detect the status of the target FIFOs, and when all the target FIFOs have data, the data processing unit 12 sends data to the next stage, that is, sends the data in all the target FIFOs to the target terminal 30 synchronously. Thus, the target terminal 30 can be guaranteed to receive the aligned data, namely, the data alignment work on the multi-item label data line is completed, so that the accuracy and the stability of data transmission are guaranteed.
With continued reference to fig. 1, in an alternative embodiment, M valid identification lines are further disposed between the data detection unit 11 and the DPHY receiving end 20. Wherein valid_lane_i represents the i-number valid identification line.
The data detection unit 11 is configured to receive valid data transmitted by the ith item target data line when the ith item target identification line is set high, where the ith item target identification line is a valid identification line corresponding to the ith item target data line.
Optionally, when the i-th entry target identification line is set high, sampling the i-th entry target data line based on a clock signal on the clock line, thereby obtaining valid data transmitted by the i-th entry target data line, and writing the valid data into the i-th target FIFO.
Referring to fig. 4, fig. 4 is a second schematic diagram of a deskew system according to an embodiment of the invention. In an alternative embodiment, the deskewing system further comprises a control unit 40, and the deskewing apparatus 10 further comprises a configuration unit 13, wherein the configuration unit 13 is connected to the data detection unit 11 and the control unit 40, respectively. Optionally, the control unit 40 is also connected to the data detection unit 11 (not shown in the figure). The configuration unit 13 may be, but not limited to, a configuration register, and the control unit 40 may be understood as an upper computer.
The data detection unit 11 is further configured to obtain a set-up time point of each entry mark line in the current stage.
The set high point in time represents a start point in time at which the signal starts to be valid.
The data detection unit 11 is further configured to determine a current skew value according to a set-up time point of each of the tag lines.
Optionally, the current skew value is the maximum clock difference in the set-up time points of all target identification lines. The maximum clock difference may be understood as the difference between the earliest set-up time point and the latest set-up time point.
The data detection unit 11 is also arranged to write the current skew value to the configuration unit 13.
The control unit 40 is arranged to adjust the depth of the respective target FIFOs in dependence on the current skew value.
The control unit 40 may invoke the current skew value in the configuration unit 13. Optionally, the depth value of the target FIFO is equal to the current skew value, or the depth value of the target FIFO is equal to the sum of the current skew value and the first preset value. The first preset value may be 1,2,3, etc. When the deflection changes, if the depth of the FIFO is insufficient, the alignment of data is affected, and a certain reserved space is reserved for the depth of the FIFO by setting a first preset value, so that excessive resources are not occupied.
In an alternative embodiment, the M data lines do not transmit data at the same time, and in order for the data detection unit 11 to be able to monitor the target data line transmitting the data, an alternative embodiment is provided in the present embodiment, please refer to the following.
The control unit 40 is further configured to write to the configuration unit 13 according to a configuration instruction comprising identification information of the target data line and identification information of the target FIFO.
The data detection unit 11 is configured to determine a target data line and its corresponding target FIFO according to the configuration instruction.
The embodiment of the invention also provides a method for eliminating the deflection, which is applied to the deflection eliminating device, please refer to fig. 5, and fig. 5 is one of the flow charts of the method for eliminating the deflection provided by the embodiment of the invention. Specifically, the deskewing method includes: s102 and S103 are specifically described below.
S102, writing the effective data transmitted by the DPHY receiving end through the ith target data line into the ith target FIFO.
The target data lines are any data line between the skew eliminating device and the DPHY receiving end, the target FIFO is the FIFO deployed in the skew eliminating device, and the number of the target data lines is the same as that of the target FIFO.
S103, when all the target FIFOs are not empty, synchronously transmitting the data in all the target FIFOs to the target terminal.
Optionally, M effective identification lines are further disposed between the deskew device and the DPHY receiving end. Referring to fig. 6, fig. 6is a second flowchart of a deskewing method according to an embodiment of the invention. Specifically, the deskewing method further includes: s101 is specifically described below.
S101, when an ith item mark line is set high, receiving effective data transmitted by the ith item mark data line, wherein the ith item mark line is an effective mark line corresponding to the ith item mark data line.
Referring to fig. 7, fig. 7 is a third flowchart of a deskew method according to an embodiment of the invention. Specifically, the deskewing method further includes: s111, S112, and S113 are specifically described below.
S111, obtaining the set-up time point of each item mark line in the current stage.
S112, determining the current deflection value according to the set-up time point of each item mark line.
S113, writing the current deflection value into the configuration unit, wherein the current deflection value is used for adjusting the depth of each target FIFO.
It should be noted that, the deskewing method provided in this embodiment may perform the functional purposes shown in the above system embodiments to achieve the corresponding technical effects. For a brief description, reference is made to the corresponding parts of the above embodiments, where this embodiment is not mentioned.
The embodiment of the invention also provides electronic equipment which comprises the deflection eliminating system.
In summary, the method, the system and the electronic device for eliminating skew provided by the embodiments of the present invention include a DPHY receiving end, a skew eliminating device and a target terminal, the skew eliminating device includes a data detecting unit and a data processing unit, M data lines are disposed between the data detecting unit and the DPHY receiving end, and the data processing unit is respectively connected with the data detecting unit and the target terminal; the data detection unit is used for writing the effective data transmitted by the DPHY receiving end through the ith target data line into the ith target FIFO; the target data lines are any one of M data lines, the target FIFO is a FIFO deployed in the data detection unit, and the number of the target data lines is the same as that of the target FIFOs; and the data processing unit is used for synchronously transmitting the data in all the target FIFOs to the target terminal when all the target FIFOs are not empty. The method can ensure that the target terminal receives the aligned data, namely, the data alignment work on the multi-item standard data line is completed, so that the accuracy and the stability of data transmission are ensured.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (10)
1. The system for eliminating the deflection is characterized by comprising a DPHY receiving end, a deflection eliminating device and a target terminal, wherein the deflection eliminating device comprises a data detection unit and a data processing unit, M data lines are arranged between the data detection unit and the DPHY receiving end, and the data processing unit is respectively connected with the data detection unit and the target terminal;
the data detection unit is used for writing the effective data transmitted by the DPHY receiving end through the ith target data line into the ith target FIFO;
The target data lines are any one of the M data lines, the target FIFO is the FIFO deployed in the data detection unit, and the number of the target data lines is the same as the number of the target FIFOs;
and the data processing unit is used for synchronously transmitting the data in all the target FIFOs to the target terminal when all the target FIFOs are not empty.
2. The deskewing system of claim 1, wherein M valid identification lines are further provided between the data detection unit and the DPHY receiving end;
The data detection unit is used for receiving effective data transmitted by the ith item mark data line when the ith item mark data line is set high, wherein the ith item mark data line is the effective mark line corresponding to the ith item mark data line.
3. The deskewing system of claim 2, further comprising a control unit, the deskewing apparatus further comprising a configuration unit respectively connected to the data detection unit and the control unit;
the data detection unit is also used for acquiring a set-up time point of each item mark identification line in the current stage;
The data detection unit is also used for determining a current deflection value according to the set-up time point of each item mark identification line;
The data detection unit is further configured to write the current skew value into the configuration unit;
the control unit is used for adjusting the depth of each target FIFO according to the current deflection value.
4. The deskewing system of claim 3, wherein the current skew value is a maximum clock difference in a set-up time point for all target identification lines.
5. The deskewing system of claim 3, wherein a depth value of the target FIFO is equal to a sum of the current deskew value and a first preset value.
6. The deskewing system of claim 3 wherein,
The control unit is further used for writing into the configuration unit according to a configuration instruction, wherein the configuration instruction comprises identification information of a target data line and identification information of a target FIFO;
The data detection unit is used for determining a target data line and a corresponding target FIFO according to the configuration instruction.
7. A deskewing method for use with a deskewing apparatus, the method comprising;
Writing the effective data transmitted by the DPHY receiving end through the ith item mark data line into the ith target FIFO;
The target data line is any one data line between the skew eliminating device and the DPHY receiving end, the target FIFO is the FIFO deployed in the skew eliminating device, and the number of the target data lines is the same as that of the target FIFOs;
And when all the target FIFOs are not empty, synchronously transmitting the data in all the target FIFOs to the target terminal.
8. The deskewing method of claim 7, wherein M valid identification lines are further provided between the deskewing apparatus and the DPHY receiving end, the method further comprising:
And when the ith item mark line is set high, receiving the effective data transmitted by the ith item mark data line, wherein the ith item mark line is the effective mark line corresponding to the ith item mark data line.
9. The deskewing method of claim 8, wherein the method further comprises:
Acquiring a set-up time point of each item mark identification line in the current stage;
determining a current deflection value according to the set-up time point of each item mark identification line;
And writing the current deflection value into a configuration unit, wherein the current deflection value is used for adjusting the depth of each target FIFO.
10. An electronic device comprising the deskew system of any of claims 1-6.
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