CN116074165A

CN116074165A - Method, device, equipment and storage medium for obtaining DFE tap in self-adaption mode

Info

Publication number: CN116074165A
Application number: CN202310165880.7A
Authority: CN
Inventors: 陈思齐; 宋飞
Original assignee: Shanghai Anlu Information Technology Co ltd
Current assignee: Shanghai Anlu Information Technology Co ltd
Priority date: 2023-02-24
Filing date: 2023-02-24
Publication date: 2023-05-05
Anticipated expiration: 2043-02-24
Also published as: CN116074165B

Abstract

The invention provides a method, a device, equipment and a storage medium for obtaining a DFE tap in a self-adaptive way, wherein the method comprises the following steps: selecting a current TAP1 value based on the current TAP1 value adjustment range; outputting an eye pattern based on the currently selected TAP1 value, and setting the position of the EOM judging line to be the same as the position of the data judging line corresponding to the current TAP1 value; determining the position relation between the current sampling position and an EOM judging line based on a consistency comparison result of the EOM sampling output value and the RX data sampling value, and outputting a first mark or a second mark respectively; according to the number of the first marks and the second marks, the current TAP1 value adjusting range is adjusted; and returning to circularly execute all the steps until the preset condition is met, and obtaining the final TAP1 value. According to the invention, the data is processed by the EOM judging line to reflect the eye position change to guide the adjustment of the TAP1 value, and the converged TAP1 value is finally obtained through multiple times of adjustment, so that the optimal value of the TAP1 can be selected in a self-adaptive manner according to different scenes of users, the eye is symmetrical left and right, and the Jtol performance is improved.

Description

Method, device, equipment and storage medium for obtaining DFE tap in self-adaption mode

Technical Field

The present invention relates to the field of signal processing technologies, and in particular, to a method, an apparatus, a device, and a storage medium for adaptively obtaining a DFE tap.

Background

DFE is commonly used in SERDES Receivers (RX) to eliminate inter-signal interference (ISI) caused by lossy channels. The DFE includes a Finite Impulse Response (FIR) filter, an adder, and a decision slicer (slicer) for signal decision. Jtol is a very critical indicator for Serdes RX circuits. Various communication protocols typically have certain constraints and specification requirements for the Jtol of the receiving module. To achieve a good Jtol for a high-speed circuit, the DFE module is required to correctly cut and reassemble the data stream.

Fig. 2 shows the data flow eye diagram after DFE slicing and reorganization, the central eye diagram needs to be spread as far as possible and kept as symmetrical as possible, and this design allows the system to have as large a margin as possible to meet the Jtol requirements of various communication protocols.

The TAP value refers to the TAP (TAP) in the DFE internal structure, the DFE module stores versions of the data delay of 1-n clock cycles, the number i of each TAP corresponds to the data delay of i cycles, and the value of each TAP is sent back to the DFE input to be subtracted from the original signal, thereby eliminating ISI generated by the signal tail of the previous 1-n clock cycles overlapping the current bit signal.

In high speed applications, limited by process rate limits and circuit architecture, the duration of TAP1 processing and computation in the FIR may exceed one UI, resulting in erroneous results, so TAP1 cannot add or subtract to the input signal with TAP 2-TAP using the same delay feedback structure. The TAP1 under the existing architecture is implemented in a static manner by directly subtracting a set value from an input signal in advance without participating in feedback and addition in order to bypass a speed limit. The TAP1 setting is related to the pre-channel parameters.

In the current high-speed RX application, the TAP1 value directly determines the symmetry of the eye diagram, which directly determines the performance of the Jtol. At present, since the TAP1 value is a manually set value, in practical applications, the environment and channel parameters of the client are uncertain, and a fixed TAP1 value is difficult to cover different application scenarios of the client. An unreasonable TAP1 value can compress the Jtol performance range, possibly causing the problems that RX does not meet the protocol requirement, bit error rate rises, even the data communication is out of lock, and the like, so that the data communication cannot be performed normally.

Disclosure of Invention

The invention aims to provide a method, a device, equipment and a storage medium for adaptively acquiring a DFE TAP, so as to solve the technical problems, and the method, the device and the equipment can adaptively select the optimal value of the TAP1 according to different scenes of users, so that an eye diagram is bilaterally symmetrical, and the Jtol performance is improved.

In order to solve the above technical problems, the present invention provides a method for adaptively obtaining a DFE tap, including:

selecting a current TAP1 value based on the current TAP1 value adjustment range;

outputting an eye pattern based on the currently selected TAP1 value, and setting the position of the EOM judging line to be the same as the position of the data judging line corresponding to the current TAP1 value;

for each clock lattice point of the current eye diagram period, determining the position relation between the current sampling position and the EOM judgment line based on the consistency comparison result of the EOM sampling output value and the RX data sampling value, and outputting a first mark or a second mark according to the position relation between the current sampling position and the EOM judgment line;

according to the number comparison relation between the first marks and the second marks corresponding to all clock grid points of the current eye pattern period, the current TAP1 value adjusting range is adjusted;

and returning to circularly execute all the steps until the preset condition is met, and obtaining the final TAP1 value.

Further, the selecting the current TAP1 value based on the current TAP1 value adjustment range includes:

dividing the current TAP1 value adjusting range into a plurality of TAP1 optional values based on preset equally dividing intervals, sorting the plurality of TAP1 optional values, and selecting the current TAP1 value based on the intermediate position of the sorted plurality of TAP1 optional values.

Further, the determining the positional relationship between the current sampling position and the EOM determining line based on the consistency comparison result between the EOM sampling output value and the RX data sampling value, and outputting the first mark or the second mark according to the positional relationship between the current sampling position and the EOM determining line, includes:

carrying out consistency comparison on the EOM sampling output value and the RX data sampling value, repeatedly carrying out consistency comparison with preset times, and respectively counting a first time when the consistency comparison result is consistent and a second time when the consistency comparison result is inconsistent;

if the first times are judged to be larger than the second times, determining that the current sampling position is higher than the EOM judging line, and outputting a first mark;

and if the first times are less than the second times, determining that the current sampling position is lower than the EOM judging line, and outputting a second mark.

Further, the adjusting the current TAP1 value adjusting range according to the number comparison relation between the first marks and the second marks corresponding to all clock lattice points of the current eye diagram period includes:

if the number of the first marks is judged to be larger than the number of the second marks, the current TAP1 value adjusting range is adjusted based on the range between the middle value and the maximum value of the current TAP1 value adjusting range;

and if the number of the first marks is not larger than the number of the second marks, adjusting the current TAP1 value adjusting range based on the range between the middle value and the minimum value of the current TAP1 value adjusting range.

Further, the step until the preset condition is met includes:

and determining the maximum adjustment times corresponding to the initial TAP1 value adjustment range based on a dichotomy, and judging that the preset condition is met if the times for adjusting the current TAP1 value adjustment range are judged to reach the maximum adjustment times.

Further, the initial TAP1 value adjustment range is 0 to 0.5.

Further, the initial TAP1 value adjustment range is divided into 256 TAP1 selectable values; the initial TAP1 value adjustment range corresponds to a maximum number of adjustments of 8.

The invention also provides a device for obtaining the DFE tap in a self-adaptive way, which comprises the following steps:

the TAP1 value selecting module is used for selecting a current TAP1 value based on the current TAP1 value adjusting range;

the judging line setting module is used for outputting an eye pattern based on the currently selected TAP1 value, and setting the position of the EOM judging line to be the same as the position of the data judging line corresponding to the current TAP1 value;

the data marking module is used for determining the position relation between the current sampling position and the EOM judgment line based on the consistency comparison result of the EOM sampling output value and the RX data sampling value for each clock lattice point of the current eye pattern period, and outputting a first mark or a second mark according to the position relation between the current sampling position and the EOM judgment line;

the range adjusting module is used for adjusting the current TAP1 value adjusting range according to the number comparison relation between the first marks and the second marks corresponding to all clock grid points of the current eye pattern period;

and the circulation control module is used for returning to and circularly executing the steps corresponding to the TAP1 value selection module, the judgment line setting module, the data marking module and the range adjustment module until a preset condition is met, and obtaining a final TAP1 value.

The invention also provides a terminal device comprising a processor and a memory storing a computer program, wherein the processor implements any one of the DFE tap adaptive acquisition methods when executing the computer program.

The present invention also provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the DFE tap adaptive acquisition method of any one of the above.

Compared with the prior art, the invention has the following beneficial effects:

the invention provides a method, a device, equipment and a storage medium for obtaining a DFE tap in a self-adaptive way, wherein the method comprises the following steps: selecting a current TAP1 value based on the current TAP1 value adjustment range; outputting an eye pattern based on the currently selected TAP1 value, and setting the position of the EOM judging line to be the same as the position of the data judging line corresponding to the current TAP1 value; determining the position relation between the current sampling position and the EOM judgment line based on the consistency comparison result of the EOM sampling output value and the RX data sampling value, and outputting a first mark or a second mark respectively; according to the number of the first marks and the second marks, the current TAP1 value adjusting range is adjusted; and returning to circularly execute all the steps until the preset condition is met, and obtaining the final TAP1 value. According to the invention, the position of the EOM judgment line is adjusted to process the sampling data, the adjustment of the TAP1 value is guided through the positions of the data and the judgment line, and the final TAP1 value is obtained through multiple times of adjustment until convergence, so that the optimal value of the TAP1 can be selected in a self-adaptive manner according to different scenes of a user, the left and right symmetry of an eye diagram is realized, and the Jtol performance is improved.

Drawings

Fig. 1 is a schematic flow chart of a DFE tap adaptive acquisition method provided by the present invention;

fig. 2 is an eye diagram of a data stream after ISI cancellation by a DFE provided by the present invention;

FIG. 3 is a block diagram of a DFE signal processing flow for n TAPs (TAPs) provided by the present invention;

fig. 4 is a schematic diagram of a waveform with ISI after a single bit pulse signal input waveform VS provided by the present invention is attenuated by a channel;

fig. 5 is a schematic diagram of the working principle of the three-tap DFE provided by the present invention;

FIG. 6 is a schematic diagram showing a comparison of modified waveforms of a DFE input pulse and a DFE-passed output pulse of a 3-TAP provided by the present invention;

FIG. 7 is a schematic diagram of an eye diagram result of EOM measurement and output provided by the present invention;

FIG. 8 is a schematic diagram of an EOM statistical decision method according to the present invention;

FIG. 9 is a second flow chart of the adaptive acquisition method for DFE taps provided by the present invention;

FIG. 10 is a diagram showing an eye diagram of a data stream of TAP1 in each stage and using TAP1_final according to the present invention;

fig. 11 is a schematic structural diagram of a DFE tap adaptive acquisition apparatus provided by the present invention.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. 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.

Referring to fig. 1, an embodiment of the present invention provides a method for adaptively obtaining a DFE tap, which may include the steps of:

s1, selecting a current TAP1 value based on a current TAP1 value adjusting range;

s2, outputting an eye diagram based on the currently selected TAP1 value, and setting the position of the EOM judgment line to be the same as the position of the data judgment line corresponding to the current TAP1 value;

s3, for each clock lattice point of the current eye diagram period, determining the position relation between the current sampling position and the EOM judgment line based on the consistency comparison result of the EOM sampling output value and the RX data sampling value, and outputting a first mark or a second mark according to the position relation between the current sampling position and the EOM judgment line;

s4, according to the number comparison relation between the first marks and the second marks corresponding to all clock grid points of the current eye pattern period, adjusting the current TAP1 value adjusting range;

s5, returning to the steps S1-S4 for executing the circulation until the preset condition is met, and obtaining a final TAP1 value.

It will be appreciated that, before the first execution of step S1, a preset initial TAP1 value adjustment range is first acquired as the "current TAP1 value adjustment range" of the first execution S1; when the execution returns to step S1 from step S5, the adjusted TAP1 value adjustment range is taken as the "current TAP1 value adjustment range". Each time a TAP1 value is selected from the TAP1 value adjustment range, the intermediate value of the TAP1 value adjustment range may be selected as the TAP1 value of the current cycle in order to reach a converging state as soon as possible, obtaining the final TAP1 value.

In the embodiment of the present invention, further, the selecting the current TAP1 value based on the current TAP1 value adjustment range includes:

For example, the initial TAP1 value adjustment range may be divided into 256 values, and the 256 values sorted from large to small, with the middle value selected as the current TAP1 value.

In the embodiment of the present invention, further, the determining the positional relationship between the current sampling position and the EOM determining line based on the consistency comparison result between the EOM sampling output value and the RX data sampling value, and outputting the first mark or the second mark according to the positional relationship between the current sampling position and the EOM determining line, includes:

In the embodiment of the present invention, further, the adjusting the current TAP1 value adjusting range according to the number comparison relation between the first marks and the second marks corresponding to all clock lattice points of the current eye diagram period includes:

If the number of the first marks is greater than the number of the second marks, it is indicated that the currently selected TAP1 value is larger, and the TAP1 value should be reduced appropriately. Therefore, the right part of the current TAP1 value adjustment range should be selected as the TAP1 value adjustment range of the next cycle, and preferably the current TAP1 value adjustment range may be adjusted based on a range between the middle value and the maximum value of the current TAP1 value adjustment range, so that the most suitable TAP1 value can be obtained as soon as possible based on the dichotomy principle.

In an embodiment of the present invention, further, the step until a preset condition is satisfied includes:

It should be noted that, when a preset condition is satisfied, that is, the loop is ended, and the final TAP1 value is output, the preset condition may be a fixed set number of loops, or may be determined according to an initial TAP1 value adjustment range, for example, the initial TAP1 value adjustment range is divided into 256 grids, and then the corresponding maximum adjustment number may be determined to be 8 times based on the principle of dichotomy.

In an embodiment of the invention, further, the initial TAP1 value is adjusted to a range of 0 to 0.5.

In the embodiment of the invention, further, the initial TAP1 value adjustment range is divided into 256 TAP1 selectable values; the initial TAP1 value adjustment range corresponds to a maximum number of adjustments of 8.

It should be noted that, in the embodiment of the present invention, the position of the EOM decision line is adjusted to process the sampled data, and the adjustment of the TAP1 value is guided by the position of the data and the decision line, and the final TAP1 value is obtained by multiple adjustments until convergence, so that the best value of TAP1 can be adaptively selected according to different scenes of the user, so that the eye diagram is symmetric left and right, and the Jtol performance is improved.

The following description of the relevant terms of embodiments of the invention is provided:

serdes: the SERializer/deseriaalizer is abbreviated as DESerializer, and the specific functions are as follows: at the transmitting end, the multi-path low-speed parallel signals are converted into high-speed serial signals, and finally, at the receiving end, the high-speed serial signals are converted into low-speed parallel signals again through a transmission medium (an optical cable or a copper wire).

RX: the RX receiver is abbreviated as chinese name communication receiving unit, herein referred to as a receiving module in the Serdes communication system.

Channel loss: channel attenuation, distortion of signal amplitude and phase caused by physical non-idealities of signal paths, and excessive channel loss can make signals difficult to identify by receivers, resulting in bit errors.

DFE: decision Feedback Equalizer DFE is commonly used in Serdes Receivers (RX) to eliminate inter-signal interference (ISI) caused by lossy channels by obtaining different tap values by delaying n clock cycles, by a specific circuit structure and digital algorithm, and feeding back to the input signal for addition and subtraction.

ISI: intern symbol interference, intersymbol interference. In the data transmission process, when the rate is gradually increased, the interval between the front data and the rear data is reduced, so that the signal quality is poor, and the front data and the rear data are overlapped to a certain extent and cannot be accurately distinguished, so that ISI is generated.

TAP1 to TAPn: in particular to taps (taps) in the internal structure of the DFE, the DFE module stores versions of data delayed by 1-n clock cycles, the number i of each tap corresponds to data delayed by i cycles, and the value of each tap is sent back to the DFE input to be subtracted from the original signal, so that ISI generated by overlapping signal tails of the first 1-n clock cycles to the current bit signal is eliminated.

BER: the Bit Error Ratio, also called Bit Error rate, is the number of erroneous bits divided by the total number of bits transmitted, typically expressed as a percentage, during a studied time interval.

Jtol: jitter tolerance, characterizes the ability of a communication system or device interface (including electrical signal interfaces and optical signal interfaces) to withstand input Jitter. The input test sequence is typically a random sequence of sinusoidal modulations, and defines the sinusoidal jitter amplitude, which produces a certain degradation of a given bit error performance (e.g., bit error power cost criteria and bit error occurrence criteria), as the jitter tolerance. Various communication protocols typically have certain constraints and specification requirements for the Jtol of the receiving module.

An FIR filter: finite length unit impulse response filters.

Summer: an adder, herein referred to as a circuit block, provides a signal and a summation of signals.

Slicers: a slicer.

Eye diagram: and a pattern obtained by overlapping each symbol waveform obtained by scanning the data stream.

UI: the unit is abbreviated, and the symbol time length of one bit is 1UI.

EOM: eye Monitor is a short term for Eye mapper, and an auxiliary measurement module is built in the chip and is used for drawing Eye diagrams of different nodes in the chip, and the Eye diagrams generally comprise a circuit structure and an algorithm module.

The following further describes the relevant background of the embodiments of the present invention:

1) The function of the DFE is described as follows: FIG. 3 shows an example of an n-tap DFE, y _k For input signals, non-ideal factors such as channel loss and ISI, noise and the like are superimposed on the signals, y _k The quality of the eye pattern added by 1 (high level) and 0 (low level) of the data is poor (eye pattern at the reference sign), and the data cannot be correctly read by the receiving end at the later stage. Feedback computation by adding DFE structure, z after adder _k The eyelid in the signal is spread, the decision slider can normally decide the data to 1 level and 0 level, thus d _k The correct data can be output.

2) The principle by which a DFE can stretch the eye pattern and improve signal quality is described as follows: fig. 4 shows a waveform Dloss formed by superimposing non-ideal factors such as ISI, channel loss, etc. on an ideal single bit pulse signal Drxinput at an RX input port through an RX channel. As an illustration, the Dloss signal is used as an input to a three tap (3-tap) DFE as shown in fig. 5. First, the ISI interference of the current signal arising from the superposition of the past signals is obtained by 3-stage delays and multiplying the corresponding coefficients (C0, C1, C2) using an FIR module, wherein the symbols of C0, C1, C2 are given by the previous stage sler decisions. The interference is then subtracted from the input signal using a summer. Finally, slicers decide and send the signal back to the FIR module. In this example, if the sampling point of the current signal is t [0], tap=3 means that ISI that the DFE can cancel is t < -1 >, t < -2 >, and the symbol signal at t < -3 > has an effect on the t [0] signal. The more TAPs means the more the influence of past symbols that can be eliminated.

From the principle explanation, it can be seen that the choice of parameters of C0, C1, C2 … … Cn is very important, and the optimal DFE state is to exactly cancel the ISI effect at the point of time of each sample. Fig. 6 shows a comparison of the modified waveforms of the input pulse and the output pulse after DFE, at the values of C0 to C2, which are relatively ideal. Each "x" point in the figure represents the current sample point, and by accurate selection of C0-C2, the system successfully eliminates third-order ISI and takes the correct data at the T0-T3 sample points. It can also be seen from the schematic diagram that the value of TAP1 is typically larger than the other TAP TAPs.

DFE plays an important role in signal recovery of RX circuits, especially in high-speed circuits. The choice of parameters for the DFE for the TAPn, n taps, derives a variety of circuit and algorithm schemes to accommodate different rates and RX architectures.

The EOM module is a built-in auxiliary measurement module of the chip and is used for drawing eye patterns of different nodes in the chip. The EOM (Eye Monitor) circuit is an internal measurement module within the serdes RX circuit that functions to measure the internal eye diagram of the circuit and output visual data. Typically an EOM circuit has its own clock and lateral decision lines by which an eye pattern can be split into multiple digitized lattices, as shown in fig. 7.

It should be noted that, in the above prior art solution, the TAP1 value is a manually set value, but in practical application, the environment and channel parameters of the client are uncertain, and a fixed TAP1 value is difficult to cover different application scenarios of the client. An unreasonable TAP1 value can compress the Jtol performance range, possibly causing the problems that RX does not meet the protocol requirement, bit error rate rises, even the data communication is out of lock, and the like, so that the data communication cannot be performed normally.

The embodiment of the invention designs a TAP1 self-adaptive algorithm based on EOM statistics, which can automatically select the optimal value of TAP1 according to different scenes of users, so that an eye diagram is bilaterally symmetrical, and Jtol performance is improved. The position and the change condition of the eye pattern edge can be reflected by processing and calculating the data by using the independent clock and the independent decision line of the EOM circuit. The algorithm can eliminate numerical uncertainty caused by random data by sampling statistics for multiple times and averaging, and stably and accurately converges TAP 1.

In order to better understand the DFE tap adaptive acquisition method provided by the embodiment of the present invention, the following details are described:

referring to fig. 9, the minimum value of TAP1 is 0 and the maximum value is 0.5 in the circuit, and the digital algorithm divides the whole TAP1 adjusting range into 256 cells, wherein each cell 0.001953125. The decision basis of the algorithm is shown in the left side of fig. 8, the clock positions of the EOM and the data are synchronously fixed to be 0 point, the transverse measurement of the EOM is set to be the same as the position of a decision line x when the initial TAP1 is set, the output Sout of the ey monitor at the sampling position is started to be read and compared with the value Dout of the current data sampling point, if sout=dout outputs 0, sout is not equal to Dout output 1 (sout=dout indicates that the current sampling position is higher than the EOM decision line, sout is not equal to Dout indicates that the sampling position is lower than the EOM decision line); counting 1000 times and comparing the numbers of 0 and 1, if cnt0 is less than cnt1, recording the clock position of the current position point and marking as 1, and if cnt0 is more than cnt1, recording the current clock position and marking as 0. After counting and calculating the marking value for a plurality of times (for example, 1000 times) at one clock point, the clock moves to the right for one time, and the calculation and counting above are repeated and the value corresponding to the current clock is marked. Until the whole eye cycle (64 points in fig. 8) is counted.

The numbers Sum0 and Sum1 of 0 and 1 appearing at the 64 points are counted, and the convergence process of the TAP1 is guided through the comparison of the numbers of 0 and 1. Specifically, if Sum0 > Sum1, it is indicated that the TAP1 value is small, and the TAP1 value needs to be increased, so the TAP1 of the next cycle is modified as follows: executing an l=mid+1 instruction (determining the lower limit of the adjusted adjustable range), and adjusting the TAP1 value according to the intermediate value of the adjusted adjustable range; if Sum0 < Sum1, it is indicated that the TAP1 value is larger, and the TAP1 value needs to be reduced, so the TAP1 in the next cycle is modified as follows: an h=mid-1 instruction is executed (determining the upper limit of the adjusted adjustable range) and the TAP1 value is adjusted according to the intermediate value of the adjusted adjustable range.

Each time the TAP1 value is adjusted, the counter=counter+1 of the loop counter is counted, and whether the loop counter value meets a specified condition (for example, the number of loops reaches 8 times) is determined, if not, the TAP1 value is updated and the step of setting the EOM determination line position is returned, the numbers of 0 and 1 are rescanned and counted, and the TAP1 value is re-determined and updated; if the condition is met, the whole searching process is judged to be finished, and the finally found TAP1_final value is output.

It should be noted that, in fig. 8, the abscissa is the horizontal resolution lattice point when an eye is drawn, the whole eye period is 1UI, and is considered to be divided into several tens of parts (e.g. 64 parts); the ordinate is the physical height of the sampled data signal, the unit being understood as V (volts).

It will be appreciated that after the TAP1 has set a value, the value is passed into the circuit using a set of signal lines. The measuring ruler of the EOM also has a set of signal lines of the same bit number to control, here the control line of the EOM and the first time value of TAP1 are set to be the same. The Eye monitor is provided with an independent clock and an independent output port Sout, and the Sout samples once, and outputs corresponding acquired values, and the sampling of the values is similar to the output of the data sampling point.

The "data sampling point" refers to data obtained by sampling data input from RX by an internal clock of the RX. The function of RX is to receive the distorted rotted data and to recover it in various ways as good data that can be separated by 0/1 and output.

In knowing the adjustment of TAP1 based on the statistics of the tags, if 0 and 1 are equal in number, e.g., 32:32, the edges of the portion below and the portion above the EOM decision line are described as being as long. If the number of 0 s is larger, the side 0 is shown longer in the right side of the figure 8; if 1 number is more, the side 1 is longer; based on these feedback, the value of TAP1 can then be adjusted: the larger the TAP1 value is, the lower the EOM determination line is pressed, and 0 is more; whereas 1 will become more.

Fig. 10 shows the whole process of the whole search algorithm, the right half is a data stream eye diagram drawn by using TAP1_final, and it can be seen that the adaptively calculated TAP1 successfully realizes the left-right symmetry of the inner eye.

It should be noted that the embodiment of the invention provides a TAP1 self-adaptive algorithm based on eye monitor statistics, which filters errors caused by data uncertainty through a mode of multiple statistics and averaging, and has the advantages of stable algorithm and high calculation precision.

It should be noted that, for simplicity of description, the above method or flow embodiments are all described as a series of combinations of acts, but it should be understood by those skilled in the art that the embodiments of the present invention are not limited by the order of acts described, as some steps may occur in other orders or concurrently in accordance with the embodiments of the present invention. Further, those skilled in the art will appreciate that the embodiments described in the specification are all alternative embodiments and that the actions involved are not necessarily required for the embodiments of the present invention.

Referring to fig. 11, the embodiment of the present invention further provides a DFE tap adaptive obtaining apparatus, including:

the TAP1 value selecting module 1 is used for selecting a current TAP1 value based on a current TAP1 value adjusting range;

a decision line setting module 2, configured to output an eye pattern based on the currently selected TAP1 value, and set the position of the EOM decision line to be the same as the position of the data decision line corresponding to the current TAP1 value;

the data marking module 3 is configured to determine, for each clock lattice point of the current eye diagram period, a positional relationship between a current sampling position and the EOM judgment line based on a consistency comparison result of an EOM sampling output value and an RX data sampling value, and output a first mark or a second mark according to the positional relationship between the current sampling position and the EOM judgment line, respectively;

the range adjustment module 4 is configured to adjust a current TAP1 value adjustment range according to a number comparison relationship between the first marks and the second marks corresponding to all clock lattice points in the current eye pattern period;

and the circulation control module 5 is used for returning to and circularly executing the steps corresponding to the TAP1 value selection module, the judgment line setting module, the data marking module and the range adjustment module until a preset condition is met, and obtaining a final TAP1 value.

It can be understood that the embodiment of the apparatus corresponds to the embodiment of the method of the present invention, and the apparatus for adaptively acquiring a DFE tap provided by the embodiment of the present invention may implement the method for adaptively acquiring a DFE tap provided by any one of the embodiments of the method of the present invention.

It should be noted that the above-described apparatus embodiments are merely illustrative, and the units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. In addition, in the drawings of the embodiment of the device provided by the invention, the connection relation between the modules represents that the modules have communication connection, and can be specifically implemented as one or more communication buses or signal lines. Those of ordinary skill in the art will understand and implement the present invention without undue burden.

It will be clear to those skilled in the art that, for convenience and brevity, the specific working process of the apparatus described above may refer to the corresponding process in the foregoing method embodiment, which is not described herein again.

The terminal device may be a computing device such as a desktop computer, a notebook computer, a palm computer, a cloud server, etc. The terminal device may include, but is not limited to, a processor, a memory.

The processor may be a central processing unit (Central Processing Unit, CPU), other general purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), off-the-shelf programmable gate arrays (Field-Programmable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. The general purpose processor may be a microprocessor or the processor may be any conventional processor or the like, which is a control center of the terminal device, and which connects various parts of the entire terminal device using various interfaces and lines.

The memory may be used to store the computer program, and the processor may implement various functions of the terminal device by running or executing the computer program stored in the memory and invoking data stored in the memory. The memory may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function, and the like; the storage data area may store data created according to the use of the cellular phone, etc. In addition, the memory may include high-speed random access memory, and may also include non-volatile memory, such as a hard disk, memory, plug-in hard disk, smart Media Card (SMC), secure Digital (SD) Card, flash Card (Flash Card), at least one disk storage device, flash memory device, or other volatile solid-state storage device.

The storage medium is a computer readable storage medium, and the computer program is stored in the computer readable storage medium, and when executed by a processor, the computer program can implement the steps of the above-mentioned method embodiments. Wherein the computer program comprises computer program code which may be in source code form, object code form, executable file or some intermediate form etc. The computer readable medium may include: any entity or device capable of carrying the computer program code, a recording medium, a U disk, a removable hard disk, a magnetic disk, an optical disk, a computer Memory, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), an electrical carrier signal, a telecommunications signal, a software distribution medium, and so forth. It should be noted that the computer readable medium contains content that can be appropriately scaled according to the requirements of jurisdictions in which such content is subject to legislation and patent practice, such as in certain jurisdictions in which such content is subject to legislation and patent practice, the computer readable medium does not include electrical carrier signals and telecommunication signals.

While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that changes and modifications may be made without departing from the principles of the invention, such changes and modifications are also intended to be within the scope of the invention.

Claims

1. A method for adaptively acquiring a DFE tap, comprising:

2. The DFE TAP adaptive acquisition method according to claim 1, wherein the selecting the current TAP1 value based on the current TAP1 value adjustment range includes:

3. The DFE tap-adaptive acquiring method according to claim 1, wherein determining the positional relationship between the current sampling position and the EOM decision line based on the consistency comparison result of the EOM sampling output value and the RX data sampling value, and outputting the first mark or the second mark according to the positional relationship between the current sampling position and the EOM decision line, respectively, comprises:

4. The DFE TAP-adaptive acquisition method according to claim 3, wherein adjusting the current TAP1 value adjustment range according to a number comparison relationship between the first and second markers corresponding to all clock lattice points of the current eye-diagram period includes:

5. The DFE tap adaptive acquisition method according to claim 1, wherein the until a preset condition is satisfied, comprises:

6. The DFE TAP adaptive acquisition method according to claim 1, wherein the initial TAP1 value adjustment range is from 0 to 0.5.

7. The DFE TAP adaptive acquisition method according to claim 1, wherein the initial TAP1 value adjustment range is divided into 256 TAP1 selectable values; the initial TAP1 value adjustment range corresponds to a maximum number of adjustments of 8.

8. A DFE tap adaptive acquisition apparatus, comprising:

9. A terminal device comprising a processor and a memory storing a computer program, characterized in that the processor implements the DFE tap adaptive acquisition method according to any one of claims 1 to 7 when executing the computer program.

10. A non-transitory computer readable storage medium having stored thereon a computer program, which when executed by a processor implements the DFE tap adaptive acquisition method according to any one of claims 1 to 7.