CN113050012B - Eye pattern reference voltage calibration method and device - Google Patents

Abstract

The present invention provides a method and device for calibrating an eye diagram reference voltage, comprising: determining the upper boundary and the lower boundary of the eye diagram; based on the upper boundary and the lower boundary, estimating a target area where a target reference voltage exists; scanning within the target area to determine the target reference voltage. This calibration method first determines the range of the eye diagram, and then finds out the target area where the target reference voltage exists by combining data calculation, and then scans in the target area to obtain the target reference voltage, which reduces the number of scans outside the target area , improving the calibration efficiency of the target reference voltage.

Description

Method and device for calibrating eye diagram reference voltage

technical field

The present invention relates to the technical field of signal processing, and more specifically, to a method and device for calibrating an eye diagram reference voltage.

Background technique

The eye diagram is due to the afterglow effect of the oscilloscope, and the waveforms of each symbol obtained by scanning are superimposed to form an eye diagram. It refers to a graph observed on an oscilloscope when using experimental methods to estimate and improve (by adjusting) the performance of a transmission system.

The way to observe the eye diagram is: connect an oscilloscope across the output end of the receiving filter, and then adjust the scanning period of the oscilloscope so that the horizontal scanning period of the oscilloscope is synchronized with the period of the receiving symbol. eye, so it is called "eye diagram".

The eye diagram contains a wealth of information. The influence of intersymbol crosstalk and noise can be observed from the eye diagram, which reflects the overall characteristics of the digital signal, so that the pros and cons of the system can be estimated. Therefore, eye diagram analysis is a high-speed interconnection system signal. The core of integrity analysis. In addition, this graph can also be used to adjust the characteristics of the receiving filter to reduce the intersymbol interference and improve the transmission performance of the system.

At present, applications that require data eye diagrams are mostly found in high-speed memory interfaces, such as DRAM, NAND, and SRAM. Among them, the eye diagram mainly defines its performance by parameters such as eye height and eye width, and is mainly used to characterize the transmission quality of high-speed signals.

The main function of the eye diagram reference voltage is to make the signal receiver compare and judge the high and low levels. By scanning the reference voltage within the eye height range and finding the reference voltage that determines the maximum eye width, the sampled signal can have the widest timing adjustment. margin.

Then, how to quickly and effectively calibrate the reference voltage of the eye diagram is a technical problem to be solved urgently by those skilled in the art.

Contents of the invention

In view of this, in order to solve the above problems, the present invention provides a method and device for calibrating the eye diagram reference voltage, and the technical solution is as follows:

A kind of calibration method of eye pattern reference voltage, described calibration method comprises:

Determine the upper and lower boundaries of the eye diagram;

estimating a target area where a target reference voltage exists based on the upper boundary and the lower boundary;

Scanning is performed in the target area to determine the target reference voltage.

Preferably, in the above calibration method, the determination of the upper boundary of the eye diagram includes:

Obtain the maximum value of the reference voltage;

Based on the maximum value, judging whether the eye width of the eye diagram is greater than a first set value;

If so, then determine that the voltage value represented by the current reference voltage is the upper boundary of the eye diagram;

If not, reduce the maximum value by a first preset voltage value, and re-determine whether the eye width of the eye diagram is greater than the first preset value.

Preferably, in the above calibration method, the determination of the lower boundary of the eye diagram includes:

Obtain the minimum value of the reference voltage;

Based on the minimum value, judging whether the eye width of the eye diagram is greater than a second set value;

If so, then determine that the voltage value represented by the current reference voltage is the lower boundary of the eye diagram;

If not, increasing the minimum value by a second preset voltage value, and re-judging whether the eye width of the eye diagram is greater than the second preset value.

Preferably, in the above calibration method, the estimation of the target area where the target reference voltage exists based on the upper boundary and the lower boundary includes:

obtaining an intermediate value between the upper boundary and the lower boundary;

Based on the intermediate value, a first predetermined value is extended toward the upper boundary, and a second predetermined value is extended toward the lower boundary to form the target area.

Preferably, in the above calibration method, the scanning in the target area to determine the target reference voltage includes:

scanning a reference voltage in the target area in a first direction;

Judging whether the eye width of the eye diagram is at a maximum value;

If so, record the current reference voltage, that is, the target reference voltage;

If not, then increase or decrease the current reference voltage, and re-judge whether the eye width of the eye diagram is at a maximum value;

Wherein, the first direction is a direction in which the upper boundary points to the lower boundary, or a direction in which the lower boundary points to the upper boundary.

A calibration device for an eye diagram reference voltage, the calibration device comprising:

The eye diagram range determination module is used to determine the upper boundary and the lower boundary of the eye diagram;

A target area estimation module, configured to estimate a target area where a target reference voltage exists based on the upper boundary and the lower boundary;

A reference voltage scanning module, configured to scan within the target area to determine the target reference voltage.

Preferably, in the above calibration device, the eye diagram range determination module is specifically used for:

Obtain the maximum value of the reference voltage;

Based on the maximum value, judging whether the eye width of the eye diagram is greater than a first set value;

If so, then determine that the voltage value represented by the current reference voltage is the upper boundary of the eye diagram;

If not, reduce the maximum value by a first preset voltage value, and re-determine whether the eye width of the eye diagram is greater than the first preset value.

Preferably, in the above calibration device, the eye diagram range determination module is specifically used for:

Obtain the minimum value of the reference voltage;

Based on the minimum value, judging whether the eye width of the eye diagram is greater than a second set value;

If so, then determine that the voltage value represented by the current reference voltage is the lower boundary of the eye diagram;

If not, increasing the minimum value by a second preset voltage value, and re-judging whether the eye width of the eye diagram is greater than the second preset value.

Preferably, in the above calibration device, the target area calculation module is specifically used for:

obtaining an intermediate value between the upper boundary and the lower boundary;

Based on the intermediate value, a first predetermined value is extended toward the upper boundary, and a second predetermined value is extended toward the lower boundary to form the target area.

Preferably, in the above calibration device, the reference voltage scanning module is specifically used for:

scanning a reference voltage in the target area in a first direction;

Judging whether the eye width of the eye diagram is at a maximum value;

If so, record the current reference voltage, that is, the target reference voltage;

If not, then increase or decrease the current reference voltage, and re-judge whether the eye width of the eye diagram is at a maximum value;

Wherein, the first direction is a direction in which the upper boundary points to the lower boundary, or a direction in which the lower boundary points to the upper boundary.

Compared with the prior art, the beneficial effects realized by the present invention are:

A method for calibrating an eye diagram reference voltage provided by the present invention includes: determining the upper boundary and the lower boundary of the eye diagram; based on the upper boundary and the lower boundary, deducing a target area where a target reference voltage exists; The area is scanned to determine the target reference voltage. This calibration method first determines the range of the eye diagram, and then finds out the target area where the target reference voltage exists by combining data calculation, and then scans in the target area to obtain the target reference voltage, which reduces the number of scans outside the target area , improving the calibration efficiency of the target reference voltage.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only It is an embodiment of the present invention, and those skilled in the art can also obtain other drawings according to the provided drawings without creative work.

FIG. 1 is a schematic flowchart of a method for calibrating an eye diagram reference voltage provided by an embodiment of the present invention;

FIG. 2 is a schematic diagram of the principle of an eye diagram provided by an embodiment of the present invention;

FIG. 3 is a schematic diagram of the principle of another eye diagram provided by an embodiment of the present invention;

FIG. 4 is a schematic diagram of another eye diagram principle provided by an embodiment of the present invention;

FIG. 5 is a schematic flow chart of another eye diagram reference voltage calibration method provided by an embodiment of the present invention;

FIG. 6 is a schematic flowchart of another eye diagram reference voltage calibration method provided by an embodiment of the present invention;

FIG. 7 is a schematic flowchart of another eye diagram reference voltage calibration method provided by an embodiment of the present invention;

FIG. 8 is a schematic flowchart of another eye diagram reference voltage calibration method provided by an embodiment of the present invention;

FIG. 9 is a schematic structural diagram of an eye diagram reference voltage calibration device provided by an embodiment of the present invention.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Referring to FIG. 1 , FIG. 1 is a schematic flowchart of a method for calibrating an eye diagram reference voltage according to an embodiment of the present invention.

The calibration methods include:

S101: Determine an upper boundary and a lower boundary of an eye diagram.

In this step, refer to FIG. 2 . FIG. 2 is a schematic diagram of an eye diagram principle provided by an embodiment of the present invention, wherein a dotted diamond-shaped box represents an eye diagram structure.

It should be noted that, in the embodiment of the present invention, only the shape of a dotted diamond box is used for illustration.

S102: Estimate a target area where a target reference voltage exists based on the upper boundary and the lower boundary.

In this step, refer to FIG. 3. FIG. 3 is a schematic diagram of another eye diagram principle provided by an embodiment of the present invention. Based on the upper boundary parameters and lower boundary parameters of the eye diagram, and according to engineering experience, calculation and adjustment are performed to obtain a A region of interest where a target reference voltage exists.

S103: Scan within the target area to determine the target reference voltage.

In this step, refer to FIG. 4, which is a schematic diagram of another eye diagram principle provided by the embodiment of the present invention. Based on the target area, a small step size method or a combination of a medium step size and a small step size is used. The target area is scanned to determine the target reference voltage.

Furthermore, based on different target area sizes, such as the height of the target area, a reference coefficient can be set to obtain a reasonable step size parameter. Scanning with this step size parameter can further reduce the number of scans and further improve the target area. Calibration efficiency of the reference voltage.

In this embodiment, the calibration method first determines the range of the eye diagram, and finds out the target area where the target reference voltage exists in the way of combining data calculation, and then scans in the target area to obtain the target reference voltage, that is, reduces The number of scans outside the target area improves the calibration efficiency of the target reference voltage.

Further, based on the above-mentioned embodiments of the present invention, refer to FIG. 5 , which is a schematic flowchart of another method for calibrating an eye diagram reference voltage provided by an embodiment of the present invention.

Determine the upper boundary of the eye diagram in step S101, specifically:

S1011: Obtain the maximum value of the reference voltage.

S1012: Based on the maximum value, determine whether the eye width of the eye diagram is greater than a first set value.

It should be noted that the first set value is smaller than the maximum eye width of the eye diagram.

S1013: If yes, determine that the voltage value represented by the current reference voltage is the upper boundary of the eye diagram.

S1014: If not, reduce the maximum value by a first preset voltage value, and re-judge whether the eye width of the eye diagram is greater than the first preset value.

The lower boundary of the eye diagram is then determined.

In this embodiment, by reasonably setting the value of the first preset voltage value, the number of judgments can be reduced, and thus the upper boundary of the eye diagram can be determined more efficiently.

Further, based on the above-mentioned embodiments of the present invention, refer to FIG. 6 , which is a schematic flowchart of another method for calibrating an eye diagram reference voltage provided by an embodiment of the present invention.

Determine the lower boundary of the eye diagram in step S101, specifically:

S1015: Obtain the minimum value of the reference voltage.

S1016: Based on the minimum value, determine whether the eye width of the eye diagram is greater than a second set value.

It should be noted that the second set value is smaller than the maximum eye width of the eye diagram.

S1017: If yes, determine that the voltage value represented by the current reference voltage is the lower boundary of the eye diagram.

S1018: If not, increase the minimum value by a second preset voltage value, and re-judge whether the eye width of the eye diagram is greater than the second preset value.

In this embodiment, by reasonably setting the value of the second preset voltage value, the number of judgments can be reduced, thereby more efficiently determining the lower boundary of the eye diagram.

It should be noted that, in the embodiment of the present invention, there is no sequential requirement for determining the upper boundary and the lower boundary of the eye diagram.

Further, based on the above-mentioned embodiments of the present invention, refer to FIG. 7 , which is a schematic flowchart of another method for calibrating an eye diagram reference voltage provided by an embodiment of the present invention.

In step S102, based on the upper boundary and the lower boundary, the target area where the target reference voltage exists is estimated, including:

S1021: Acquire an intermediate value between the upper boundary and the lower boundary.

S1022: Based on the intermediate value, expand to the upper boundary by a first preset value, and expand to the lower boundary by a second preset value, so as to form the target area.

In this embodiment, the first preset value and the second preset value may be the same or different, and in this embodiment of the present invention, only the middle value is taken as an example for illustration, and it is also possible to use Other ratios determine the optimal extent of the target area.

Further, based on the above-mentioned embodiments of the present invention, refer to FIG. 8 , which is a schematic flowchart of another method for calibrating an eye diagram reference voltage provided by an embodiment of the present invention.

In step S103, scanning in the target area to determine the target reference voltage includes:

S1031: Scan the reference voltage in the target area in the first direction;

S1032: Determine whether the eye width of the eye diagram is at a maximum value;

S1033: If yes, record the current reference voltage, that is, the target reference voltage;

S1034: If not, increase or decrease the current reference voltage, and re-judge whether the eye width of the eye diagram is at a maximum value;

Wherein, the first direction is a direction in which the upper boundary points to the lower boundary, or a direction in which the lower boundary points to the upper boundary.

In this embodiment, when the first direction is the direction from the upper boundary to the lower boundary, and the eye width of the eye diagram is not at the maximum value, then reduce the current reference voltage, and re-determine the Whether the eye width of the eye diagram is at its maximum value;

When the first direction is the direction in which the lower boundary points to the upper boundary, and the eye width of the eye diagram is not at the maximum value, then increase the current reference voltage, and re-judge the eye width of the eye diagram Is it at its maximum value;

Until the eye width of the eye diagram is at a maximum value, record the current reference voltage as the target reference voltage.

It can be seen from the above description that the calibration method first determines the range of the eye diagram, and finds out the target area where the target reference voltage exists in the way of combining data calculation, and then scans in the target area to obtain the target reference voltage, which reduces the target area. The number of scans outside the region improves the calibration efficiency of the target reference voltage.

Further, based on all the above-mentioned embodiments of the present invention, another embodiment of the present invention also provides a calibration device for an eye diagram reference voltage. Refer to FIG. 9, which is an eye diagram reference voltage provided by an embodiment of the present invention. Schematic diagram of the structure of the voltage calibration device.

The calibration device includes:

The eye diagram range determination module 11 is used to determine the upper boundary and the lower boundary of the eye diagram;

A target area estimation module 12, configured to estimate a target area where a target reference voltage exists based on the upper boundary and the lower boundary;

The reference voltage scanning module 13 is configured to scan within the target area to determine the target reference voltage.

In this embodiment, the calibration device first determines the range of the eye diagram, and finds out the target area where the target reference voltage exists by combining data calculation, and then scans in the target area to obtain the target reference voltage, that is, reduces The number of scans outside the target area improves the calibration efficiency of the target reference voltage.

Further, based on the above-mentioned embodiments of the present invention, the eye diagram range determining module 11 is specifically used for:

Obtain the maximum value of the reference voltage;

Based on the maximum value, judging whether the eye width of the eye diagram is greater than a first set value;

If so, then determine that the voltage value represented by the current reference voltage is the upper boundary of the eye diagram;

If not, reduce the maximum value by a first preset voltage value, and re-determine whether the eye width of the eye diagram is greater than the first preset value.

Further, based on the above-mentioned embodiments of the present invention, the eye diagram range determining module 11 is specifically used for:

Obtain the minimum value of the reference voltage;

Based on the minimum value, judging whether the eye width of the eye diagram is greater than a second set value;

If so, then determine that the voltage value represented by the current reference voltage is the lower boundary of the eye diagram;

If not, increasing the minimum value by a second preset voltage value, and re-judging whether the eye width of the eye diagram is greater than the second preset value.

Further, based on the above-mentioned embodiments of the present invention, the target area estimation module 12 is specifically used for:

obtaining an intermediate value between the upper boundary and the lower boundary;

Based on the intermediate value, a first predetermined value is extended toward the upper boundary, and a second predetermined value is extended toward the lower boundary to form the target area.

Further, based on the above-mentioned embodiments of the present invention, the reference voltage scanning module 13 is specifically used for:

scanning a reference voltage in the target area in a first direction;

Judging whether the eye width of the eye diagram is at a maximum value;

If so, record the current reference voltage, that is, the target reference voltage;

If not, then increase or decrease the current reference voltage, and re-judge whether the eye width of the eye diagram is at a maximum value;

Wherein, the first direction is a direction in which the upper boundary points to the lower boundary, or a direction in which the lower boundary points to the upper boundary.

It should be noted that the principle of the calibration device provided in the embodiment of the present invention is the same as that of the calibration method provided in the foregoing embodiments of the present invention, and will not be repeated here.

The method and device for calibrating an eye diagram reference voltage provided by the present invention have been described in detail above. In this paper, specific examples are used to illustrate the principle and implementation of the present invention. The descriptions of the above embodiments are only used to help understanding The method of the present invention and its core idea; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation and scope of application. In summary, the content of this specification should not be construed as a limitation of the invention.

It should be noted that each embodiment in this specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. For the same and similar parts in each embodiment, refer to each other, that is, Can. As for the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and for relevant details, please refer to the description of the method part.

It should also be noted that in this article, relational terms such as first and second etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that these entities or operations Any such actual relationship or order exists between. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that elements inherent in a process, method, article, or apparatus comprising a set of elements are included, or are also included as such , method, article or device inherent in the elements. Without further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising said element.

The above description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (6)

1. A method for calibrating an eye reference voltage, the method comprising:

determining an upper boundary and a lower boundary of the eye diagram;

calculating a target area with a target reference voltage based on the upper boundary and the lower boundary;

scanning in the target area to determine the target reference voltage;

the determining the upper boundary of the eye diagram includes:

obtaining the maximum value of the reference voltage;

judging whether the eye width of the eye diagram is larger than a first set value or not based on the maximum value;

if yes, determining that the voltage value represented by the current reference voltage is the upper boundary of the eye diagram;

if not, reducing the maximum value by a first preset voltage value, and judging whether the eye width of the eye diagram is larger than the first set value or not again;

the determining the lower boundary of the eye diagram includes:

obtaining the minimum value of the reference voltage;

judging whether the eye width of the eye diagram is larger than a second set value or not based on the minimum value;

if yes, determining that the voltage value represented by the current reference voltage is the lower boundary of the eye diagram;

if not, the minimum value is increased by a second preset voltage value, and whether the eye width of the eye diagram is larger than the second set value is judged again.

2. The method of calibrating according to claim 1, wherein the estimating a target region where a target reference voltage exists based on the upper boundary and the lower boundary comprises:

acquiring intermediate values of the upper boundary and the lower boundary;

and based on the intermediate value, expanding the upper boundary by a first preset value and expanding the lower boundary by a second preset value to form the target area.

3. The method of calibrating according to claim 1, wherein said scanning within said target area, determining said target reference voltage, comprises:

scanning a reference voltage in the target area in a first direction;

judging whether the eye width of the eye diagram is at the maximum value;

if yes, recording the current reference voltage, namely the target reference voltage;

if not, increasing or decreasing the current reference voltage, and judging whether the eye width of the eye diagram is at the maximum value again;

the first direction is a direction in which the upper boundary points to the lower boundary or a direction in which the lower boundary points to the upper boundary.

4. An eye reference voltage calibration apparatus, the calibration apparatus comprising:

an eye diagram range determining module for determining an upper boundary and a lower boundary of an eye diagram;

the target area reckoning module is used for reckoning a target area with a target reference voltage based on the upper boundary and the lower boundary;

the reference voltage scanning module is used for scanning in the target area and determining the target reference voltage;

the eye diagram range determining module is specifically configured to:

obtaining the maximum value of the reference voltage;

judging whether the eye width of the eye diagram is larger than a first set value or not based on the maximum value;

if yes, determining that the voltage value represented by the current reference voltage is the upper boundary of the eye diagram;

if not, reducing the maximum value by a first preset voltage value, and judging whether the eye width of the eye diagram is larger than the first set value or not again;

the eye diagram range determining module is specifically configured to:

obtaining the minimum value of the reference voltage;

judging whether the eye width of the eye diagram is larger than a second set value or not based on the minimum value;

if yes, determining that the voltage value represented by the current reference voltage is the lower boundary of the eye diagram;

if not, the minimum value is increased by a second preset voltage value, and whether the eye width of the eye diagram is larger than the second set value is judged again.

5. The calibration device of claim 4, wherein the target region estimation module is specifically configured to:

acquiring intermediate values of the upper boundary and the lower boundary;

and based on the intermediate value, expanding the upper boundary by a first preset value and expanding the lower boundary by a second preset value to form the target area.

6. The calibration device of claim 4, wherein the reference voltage scanning module is specifically configured to:

scanning a reference voltage in the target area in a first direction;

judging whether the eye width of the eye diagram is at the maximum value;

if yes, recording the current reference voltage, namely the target reference voltage;

if not, increasing or decreasing the current reference voltage, and judging whether the eye width of the eye diagram is at the maximum value again;

the first direction is a direction in which the upper boundary points to the lower boundary or a direction in which the lower boundary points to the upper boundary.

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