CN102404256B - Parameter selection method and device of high speed difference branch signal transmission circuit - Google Patents

Abstract

The invention provides a parameter selection method and device for a high-speed differential signal transmission circuit. The method includes: generating a parameter group according to several preset initial parameter groups; performing an eye diagram validity test on each parameter group in the parameter group to obtain the effective level; updating the parameter group according to the effective level of each parameter group in the parameter group; selecting the optimal parameter group from the updated parameter group. The device includes: a generation module, a test module, an update module and a selection module. The present invention selects the optimal parameter group by performing an eye diagram validity test and update on the parameter groups in the parameter group, which solves the defect in the prior art that designers only guess parameter values based on experience, reduces labor costs, and improves The efficiency and quality of high-speed differential signal transmission circuit parameter selection are improved.

Description

Parameter selection method and device for high-speed differential signal transmission circuit

technical field

The invention relates to the technical field of wired high-speed digital signal transmission, in particular to a parameter selection method and device for a high-speed differential signal transmission circuit.

Background technique

In the field of high-speed digital signal transmission, due to the influence of electromagnetic interference and current surge in the transmission circuit, differential signals are usually used to transmit high-speed digital signals to resist signal deformation caused by noise and crosstalk between circuits. The high-speed differential signal transmission circuit is a differential signal processing circuit. When sending a signal, it strengthens the effective signal in the differential signal through pre-emphasis processing; when receiving the signal, it extracts the effective signal from the differential signal through equalization processing. Due to the different line width, line thickness, line spacing, and the length of the traces on the circuit board of the differential signal lines, the electromagnetic environment of the traces is also different. When performing pre-emphasis processing and equalization processing, the pre-emphasis parameters and equalization There is a big difference in the selection of parameters. If the correct and effective parameters cannot be selected, the receiving end of the high-speed differential signal transmission circuit will not be able to see the correctly opened eye diagram, that is, it will not be able to receive valid signals during high-speed signal transmission. There are 4 pre-emphasis parameters of the high-speed differential signal transmission circuit, and the number of possible values for each item is 32, 32, 32, and 4; the equalization parameters have 5 items, and the number of possible values for each item is 8, 128, 32, 32, 16 types. For a specific pair of differential lines, all correct selection of these parameters can effectively open the eye diagram, and there are 2 trillion possible combinations of these parameters. Choosing the right set of parameters is a very difficult thing.

The current main practice is to guess possible values based on the experience of designers of high-speed differential signal transmission circuit boards, and to test on the basis of guesswork.

However, the working efficiency of this method based on experience alone is difficult to guarantee. In order to obtain a correct parameter setting, a large amount of manpower may be consumed. The automation degree of the parameter selection process is not high, requiring too much labor cost, and the efficiency of parameter selection is low. .

Contents of the invention

The present invention provides a parameter selection method and device for a high-speed differential signal transmission circuit, which is used to solve the defect in the prior art that designers need to guess the parameter values of the high-speed differential signal transmission circuit based on experience, so as to reduce labor costs and improve high-speed differential signal transmission Efficiency and quality of circuit parameter selection.

The present invention provides a parameter selection method of a high-speed differential signal transmission circuit, comprising:

Generate parameter groups according to several preset initial parameter groups;

performing an eye diagram validity test on each parameter group in the parameter group, and obtaining an effective level of each parameter group in the parameter group;

updating the parameter group according to the validity level of each parameter group in the parameter group;

An optimal set of parameters is selected from the updated group of said parameter sets.

The present invention provides a parameter selection device for a high-speed differential signal transmission circuit, comprising:

A generating module, configured to generate parameter groups according to several preset initial parameter groups;

A testing module, configured to perform an eye diagram validity test on each parameter group in the parameter group generated by the generating module, and obtain an effective level of each parameter group in the parameter group;

An update module, configured to update the parameter group according to the effective level of each parameter group in the parameter group;

A selecting module, configured to select an optimal parameter group from the parameter group updated by the updating module.

The parameter selection method and device of the high-speed differential signal transmission circuit of the present invention can select the optimal parameter group by performing the eye diagram validity test and update on the parameter groups in the parameter group, and solve the problem that the designers rely on experience in the prior art. The defect of guessing parameter values reduces labor costs and improves the efficiency and quality of parameter selection for high-speed differential signal transmission circuits.

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 These are some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained according to these drawings without any creative effort.

Fig. 1 is the flowchart of an embodiment of the parameter selection method of the high-speed differential signal transmission circuit of the present invention;

Fig. 2 is the flowchart of another embodiment of the parameter selection method of the high-speed differential signal transmission circuit of the present invention;

3 is a flow chart of another embodiment of the parameter selection method of the high-speed differential signal transmission circuit of the present invention;

4 is a schematic structural diagram of an embodiment of a parameter selection device of a high-speed differential signal transmission circuit of the present invention;

FIG. 5 is a schematic structural diagram of another embodiment of the parameter selection device of the high-speed differential signal transmission circuit of the present invention.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. 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.

FIG. 1 is a flowchart of an embodiment of a method for selecting parameters of a high-speed differential signal transmission circuit according to the present invention. As shown in FIG. 1, an embodiment of the present invention provides a parameter selection method for a high-speed differential signal transmission circuit, including:

Step 101, generating parameter groups according to several preset initial parameter groups;

Step 102, performing an eye diagram validity test on each parameter group in the parameter group, and obtaining the validity level of each parameter group in the parameter group;

Step 103, updating the parameter group according to the effective level of each parameter group in the parameter group;

Step 104, selecting an optimal parameter group from the updated parameter group.

In the embodiment of the present invention, designers can preset several initial parameter groups according to factors such as differential line width, distance between lines, line thickness, and trace length of the transmitting end and receiving end of the high-speed differential signal transmission circuit. When selecting parameters for a high-speed differential signal transmission circuit, firstly, a parameter group is generated based on several preset initial parameter groups. The parameter group includes the above-mentioned several initial parameter groups, and several transformed parameter groups obtained by transforming the above-mentioned initial parameter groups. Then, an eye diagram effectiveness test is performed on each parameter group in the parameter group group to obtain an effective level of each parameter group in the parameter group group. Next, the parameter group is updated based on the validity level of each parameter group in the parameter group. Finally, the optimal parameter group is selected from the updated parameter group.

The parameter selection method of the high-speed differential signal transmission circuit of the present invention selects the optimal parameter group by performing an eye diagram validity test and updating of the parameter groups in the parameter group, and solves the problem of guessing the parameters by the designer based on experience in the prior art The defect of the value reduces the labor cost and improves the efficiency and quality of the parameter selection of the high-speed differential signal transmission circuit.

FIG. 2 is a flow chart of another embodiment of the parameter selection method of the high-speed differential signal transmission circuit of the present invention. As shown in Figure 2, on the basis of the above technical solution, step 101 may include:

Step 201, respectively transform each parameter of the initial parameter group according to the probability, and generate several transformed parameter groups;

Step 202. Combine several initial parameter groups and several transformed parameter groups into parameter groups.

When several transformed parameter groups are obtained from the transformation of the initial parameter group, each parameter in the initial parameter group can be transformed with a specific or uncertain probability, and then several changed parameter groups can be obtained, and then these parameter groups can be combined into parameter group.

Additionally, step 102 may include:

Step 203, performing an eye diagram validity test on each parameter group in the parameter group;

Step 204, according to the width value of the eye diagram of each parameter group in the parameter group, obtain the effective level of each parameter group in the parameter group.

When performing an eye diagram validity test on each parameter group in the parameter group group, each parameter group can be divided into different effective levels according to the different width values of each parameter group.

Further, step 103 may include:

Step 205, according to the effective level of each parameter group in the parameter group, transform each parameter of the parameter group in the parameter group according to the probability, and generate several transformed parameter groups;

Step 206, performing an eye diagram validity test on several transformation parameter groups;

Step 207. Obtain the effective level of the transformation parameter set according to the width value of the eye diagram of the transformation parameter set;

Step 208, update the parameter group according to the effective level of each parameter group in the parameter group and the effective level of the transformed parameter group;

Step 209 , judging whether there is a parameter group whose effective level is greater than or equal to the effective threshold in the parameter group, if yes, perform the subsequent steps, otherwise, perform step 205 .

When updating a parameter group, different times of transformation can be performed according to the effective level of the parameter group. For example, if a certain parameter group has a higher effective level, the parameter group can be transformed multiple times to obtain multiple transformation parameter groups , if the effective level of a parameter group is low, the parameter group can be transformed for fewer times to obtain fewer transformed parameter groups. Then, an eye diagram validity test is performed on these transformation parameter groups, and the effective level of the transformation parameter group is obtained according to the width value of the eye diagram of the transformation parameter group. Select some parameter groups with higher effective levels from each parameter group in the original parameter group and the transformation parameter group to form a new parameter group. The number of parameter groups in the new parameter group can be compared with that in the original parameter group. The number of parameter groups is the same. In step 209, judge whether there is a parameter group whose effective level is greater than or equal to the effective threshold in the new parameter group, that is, judge whether there is a parameter group whose eye pattern effect meets the requirements in the new parameter group, and if it exists, execute Subsequent steps, otherwise, execute step 205 to continue generating transformation parameter groups according to the effective levels of each parameter group in the current parameter group.

Further, step 104 may include:

Step 210, comparing the validity levels of the parameter groups in the updated parameter group;

Step 211, selecting the parameter group with the largest effective level as the optimal parameter group.

When selecting the optimal parameter group from the updated parameter group, also according to the effective level of each parameter group, the parameter group with the largest effective level is selected as the optimal parameter group.

In the parameter selection method of the high-speed differential signal transmission circuit of the present invention, by performing an eye diagram validity test and update on the parameter groups in the parameter group, different times of conversion are performed according to the effective level of each parameter group, so as to obtain multiple conversion parameters group, so as to select the optimal parameter group, which solves the defect that designers guess parameter values based on experience in the prior art, reduces labor costs, and improves the efficiency and quality of parameter selection for high-speed differential signal transmission circuits.

FIG. 3 is a flow chart of another embodiment of the parameter selection method of the high-speed differential signal transmission circuit of the present invention. As shown in FIG. 3, the embodiment of the present invention provides a specific parameter selection method of a high-speed differential signal transmission circuit, including:

Step 301, the hardware developer pre-sets 10 initial initial parameter groups of the high-speed differential signal transmission circuit based on factors such as the width of the differential lines, the distance between lines, the thickness of the lines, and the length of the lines at the transmitting end and the receiving end of the high-speed differential signal transmission circuit . Then, 20 transformed parameter groups are generated based on the 10 initial parameter groups, thereby forming a parameter group.

The nine parameters constituting each parameter group are four parameters ob_preemp_main, ob_preemp_post, ob_preemp_pre, preemp_mode at the sending end, and five parameters extra_hs_gain, equal, muxmain, muxeq, main at the receiving end.

When generating 20 transformation parameter groups, on the basis of the 10 initial parameter groups, transform the 5 most important pre-emphasis and equalization parameters that affect the correct generation and reception of differential signals, and transform the pre-emphasis parameter preemp_mode with a probability of 8%, and the transformation range is 1; Change the pre-emphasis parameter ob_preemp_main with a probability of 20%, and change randomly between the change range 1-5 with an equal probability; change the equalization parameter main with a probability of 20%, and change randomly between the change range 1-5 with an equal probability ;Change the equalization parameter extra_hs_gain with a probability of 16%, and change randomly between the transformation range 1-3 with an equal probability; change the equalization parameter equal with a probability of 36%, and change randomly between the transformation range 1-50 with an equal probability, where The transformation of each parameter does not exceed its value range.

Step 302: Configure 30 parameter groups in the parameter group respectively to the transmitting end and the receiving end of the corresponding high-speed differential signal transmission circuit for testing, and perform an eye diagram validity test.

Specifically, in step 302, for a certain parameter group, configure the 4 pre-emphasis parameters in the parameter group to the transmitting end of the high-speed differential signal transmission circuit, and configure the 5 equalization parameters in the parameter group to the high-speed differential signal transmission circuit. receiving end of the circuit. Finally, a test signal is given at the sending end, and the effective level of the parameter group is obtained at the receiving end by testing the width of the eye diagram. The active level is 0 if the eye signal cannot be received within a certain time interval.

Step 303, according to the effective level in step 302, for each parameter group (and the parameter group whose effective level is non-zero) of the test eye pattern signal, independently perform three transformations to obtain three transformation parameter groups; Each parameter group (and the parameter group whose effective level is 0) of the eye diagram signal is independently transformed twice to obtain 2 transformed parameter groups.

Specifically, during the conversion, the following rules are followed, the pre-emphasis parameter preemp_mode is converted with a probability of 6%, and the conversion range is 1; the pre-emphasis parameter ob_preemp_main is converted with a probability of 16%, and the conversion range is between Randomly change between; change the pre-emphasis parameter ob_preemp_post with a probability of 3%, change randomly between the change range of 1-5 with an equal probability; change the pre-emphasis parameter ob_preemp_pre with a probability of 3%, change between the change range of 1-5 with an equal probability Randomly change between; change the equalization parameter main with a probability of 18%, change randomly between the change range 1-5 with an equal probability; change the equalization parameter extra_hs_gain with a probability of 14%, and change randomly between the change range 1-3 with an equal probability Transformation: Transform the equalization parameter equal with a probability of 34%, randomly transform between the transformation range 1-50 with an equal probability; transform the equalization parameter muxmain with a probability of 3%, and randomly transform between the transformation range 1-5 with an equal probability; The equalization parameter muxeq is changed with a probability of 3%, and the change range is randomly changed between 1-5 with an equal probability, and the change of each parameter does not exceed its value range.

Step 304, respectively configure the new transformation parameter group to the transmitting end and receiving end of the corresponding high-speed differential signal transmission circuit for testing, test the validity of the eye diagram according to the method in step 302, and test the original The parameter group and the new change parameter group are eliminated, and the size of the parameter group is kept at 30 parameter groups.

Specifically, the previously eliminated parameter groups are eliminated first, and the parameter groups eliminated each time are recorded in the memory. Keep 20 parameter groups with the best eye opening effect (that is, the highest effective level); if there are less than 20, keep all the parameter groups with eye opening (that is, the effective level is not 0). Finally, according to equal probability, randomly select parameter groups from the remaining parameter groups to make up the parameter groups of 30 parameter groups.

Step 305. If a parameter group meeting the requirements is obtained, output the parameter group with the highest effective level; otherwise, repeat steps 303-305. If no valid parameter group can be obtained after performing limited steps, output a notification that no result is generated.

Under the signal rate of 10Gbps, among the updated parameter groups, if there is already a parameter group that can make the eye diagram width reach 60 picoseconds (ps), then the parameter group with the best eye opening effect will be finally configured to the high-speed differential signal Transmission circuit; if there is a parameter group that can make the eye diagram width reach 45ps, and after step 303 is repeated 60 times, it still cannot be increased to 60ps, then the parameter group with the best eye diagram opening effect is finally configured to the high-speed differential signal transmission circuit; if In step 103, after repeating 10,000 times, the parameter set capable of making the eye width greater than or equal to 45 ps cannot be obtained, and a message is output indicating that a valid parameter set cannot be obtained.

The parameter selection method of the high-speed differential signal transmission circuit of the present invention selects the optimal parameter group by performing an eye diagram validity test and updating of the parameter groups in the parameter group, and solves the problem of guessing the parameters by the designer based on experience in the prior art The defect of the value reduces the labor cost and improves the efficiency and quality of the parameter selection of the high-speed differential signal transmission circuit.

FIG. 4 is a schematic structural diagram of an embodiment of a parameter selection device of a high-speed differential signal transmission circuit according to the present invention. As shown in FIG. 4 , an embodiment of the present invention provides a parameter selection device for a high-speed differential signal transmission circuit, including: a generation module 41 , a test module 42 , an update module 43 and a selection module 44 . Wherein, the generating module 41 is used to generate parameter groups according to several preset initial parameter groups; the testing module 42 is used to perform an eye diagram validity test on each parameter group in the parameter groups generated by the generating module 41 to obtain parameters The effective level of each parameter group in the group; the update module 43 is used to update the parameter group according to the effective level of each parameter group in the parameter group; the selection module 44 is used to select from the parameter group updated by the update module 43 optimal parameter set.

In the embodiment of the present invention, designers can preset several initial parameter groups according to factors such as differential line width, distance between lines, line thickness, and trace length of the transmitting end and receiving end of the high-speed differential signal transmission circuit. When selecting parameters for the high-speed differential signal transmission circuit, first, the generating module 41 generates parameter groups according to several preset initial parameter groups. The parameter group includes the above-mentioned several initial parameter groups, and several transformed parameter groups obtained by transforming the above-mentioned initial parameter groups. Then, the testing module 42 performs an eye diagram validity test on each parameter group in the parameter group to obtain the validity level of each parameter group in the parameter group. Next, the update module 43 updates the parameter group according to the validity level of each parameter group in the parameter group. Finally, the selection module 44 selects the optimal parameter set from the updated parameter set.

The parameter selection device of the high-speed differential signal transmission circuit of the present invention selects the optimal parameter group by performing an eye diagram validity test and update on the parameter groups in the parameter group, and solves the problem of guessing the parameters by the designer based on experience in the prior art The defect of the value reduces the labor cost and improves the efficiency and quality of the parameter selection of the high-speed differential signal transmission circuit.

FIG. 5 is a schematic structural diagram of another embodiment of the parameter selection device of the high-speed differential signal transmission circuit of the present invention. As shown in FIG. 5 , on the basis of the above technical solutions, the generation module 41 may include: a first transformation unit 51 and a combination unit 52 . Wherein, the first transformation unit 51 is used to respectively transform each parameter of the initial parameter group according to the probability to generate several transformation parameter groups; the combination unit 52 is used to combine several initial parameter groups and several described transformation parameter groups into The parameter group.

When several transformation parameter groups are obtained by transforming the initial parameter group, the first transformation unit 51 can transform each parameter in the initial parameter group with a specific or uncertain probability, and then obtain several changed parameter groups, and then combine the unit 52 combines these parameter sets into parameter groups.

In addition, the testing module 42 may include: a first testing unit 53 and a first acquiring unit 54 . Wherein, the first test unit 53 is used to test the validity of eye diagrams for each parameter group in the parameter group; the first acquisition unit 54 is used to obtain the parameter according to the width value of the eye diagram of each parameter group in the parameter group The effective level of each parameter group in the group.

When the first testing unit 53 performs an eye diagram validity test on each parameter group in the parameter group group, the first acquiring unit 54 can classify each parameter group into different effective levels according to the width value of each parameter group.

Further, the update module 43 may include: a second transformation unit 55 , a second test unit 56 , a second acquisition unit 57 , an update unit 58 and a judgment unit 59 . Wherein, the second conversion unit 55 is used to transform each parameter of the parameter group in the parameter group according to the probability according to the effective level of each parameter group in the parameter group, and generate several transformed parameter groups; the second testing unit 56 is used for carrying out the eye diagram validity test to several transformation parameter groups; The second acquisition unit 57 is used for obtaining the effective level of the transformation parameter group according to the width value of the eye diagram of the transformation parameter group; The update unit 58 is used for according to the parameter group The effective level of each parameter group in the group and the effective level of the converted parameter group are updated to update the parameter group; the judging unit 59 is used to judge whether there is a parameter group whose effective level is greater than or equal to the effective threshold in the parameter group.

When updating the parameter group, the second transformation unit 55 can perform transformations of different times according to the different effective levels of the parameter group. For example, if the effective level of a certain parameter group is higher, the parameter group can be transformed multiple times to obtain If there are multiple transformation parameter groups, if the effective level of a certain parameter group is low, the parameter group can be transformed for fewer times to obtain fewer transformation parameter groups. Then the second testing unit 56 performs an eye diagram validity test on these transformation parameter sets, and the second acquisition unit 57 obtains the validity level of the transformation parameter sets according to the width value of the eye diagram of the transformation parameter sets. The update unit 58 selects some parameter groups with higher effective levels from each parameter group and the transformation parameter group in the original parameter group to form a new parameter group, and the number of parameter groups in the new parameter group can be equal to the original parameter group. The number of parameter groups in the group is the same. The judging unit 59 judges whether there is a parameter group whose effective level is greater than or equal to the effective threshold in the new parameter group, that is, judges whether there is a parameter group whose eye diagram effect meets the requirements in the new parameter group, if not, then the first The second transformation unit 55 continues to generate transformation parameter groups according to the validity level of each parameter group in the current parameter group.

Furthermore, the selection module 44 may include: a comparison unit 510 and a selection unit 511 . Wherein, the comparing unit 510 is used for comparing the effective level of the parameter groups in the updated parameter group; the selecting unit 511 is used for selecting the parameter group with the highest effective level as the optimal parameter group.

When the optimal parameter group is selected from the updated parameter group, the comparison unit 510 compares the validity levels of each parameter group, and the selection unit 511 selects the parameter group with the largest validity level as the optimal parameter group.

The parameter selection device of the high-speed differential signal transmission circuit of the present invention performs eye diagram validity testing and updating on the parameter groups in the parameter group, and performs different times of conversion according to the effective level of each parameter group to obtain multiple conversion parameters group, so as to select the optimal parameter group, which solves the defect that designers guess parameter values based on experience in the prior art, reduces labor costs, and improves the efficiency and quality of parameter selection for high-speed differential signal transmission circuits.

Those of ordinary skill in the art can understand that all or part of the steps for realizing the above-mentioned method embodiments can be completed by hardware related to program instructions, and the aforementioned program can be stored in a computer-readable storage medium. When the program is executed, the It includes the steps of the above method embodiments; and the aforementioned storage medium includes: ROM, RAM, magnetic disk or optical disk and other various media that can store program codes.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still be Modifications are made to the technical solutions described in the foregoing embodiments, or equivalent replacements are made to some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims (8)

1. a parameter selection method for high-speed differential signal transmission circuit, is characterized in that, comprising:

According to the several initial parameter groups pre-set, generate parameter cohort;

Eye pattern validity test is carried out to each parameter group in described parameter cohort, obtains effective grade of each parameter group in described parameter cohort;

According to effective grade of each parameter group in described parameter cohort, upgrade described parameter cohort;

Optimized parameter group is selected from the described parameter cohort upgraded;

Described effective grade according to each parameter group in described parameter cohort, upgrades described parameter cohort, comprising:

A, effective grade according to each parameter group in described parameter cohort, convert according to probability each parameter of the parameter group in described parameter cohort respectively, generate several transformation parameter group;

B, eye pattern validity test is carried out to several described transformation parameter group;

C, width value according to the eye pattern of described transformation parameter group, obtain effective grade of described transformation parameter group;

D, according to effective grade of each parameter group in described parameter cohort and effective grade of described transformation parameter group, upgrade described parameter cohort;

Wherein, the parameter cohort after described renewal is that the parameter group that effective higher grade forms, and the number of the parameter group that effective higher grade described in the parameter cohort after described renewal is identical with the number upgrading parameter group in front described parameter cohort;

E, judge whether to exist in described parameter cohort the parameter group that effective grade is more than or equal to effective threshold value, if do not exist, then perform step a, if exist, then from the described parameter cohort upgraded, select optimized parameter group described in performing.

2. the parameter selection method of high-speed differential signal transmission circuit according to claim 1, is characterized in that, several initial parameter groups that described basis pre-sets, and generates parameter cohort, comprising:

Respectively each parameter of described initial parameter group is converted according to probability, generate several transformation parameter group;

Several described initial parameter group and several described transformation parameter group are combined as described parameter cohort.

3. the parameter selection method of high-speed differential signal transmission circuit according to claim 1, it is characterized in that, described eye pattern validity test is carried out to each parameter group in described parameter cohort, obtains effective grade of each parameter group in described parameter cohort, comprising:

Eye pattern validity test is carried out to each parameter group in described parameter cohort;

According to the width value of the eye pattern of each parameter group in described parameter cohort, obtain effective grade of each parameter group in described parameter cohort.

4. the parameter selection method of high-speed differential signal transmission circuit according to claim 1, is characterized in that, selecting optimized parameter group, comprising the described described parameter cohort from upgrading:

Effective grade of the parameter group in the described parameter cohort relatively upgraded;

The parameter group selecting effective grade maximum is as optimized parameter group.

5. a parameter selection apparatus for high-speed differential signal transmission circuit, is characterized in that, comprising:

Generation module, for according to the several initial parameter groups pre-set, generates parameter cohort;

Test module, carries out eye pattern validity test for each parameter group in the described parameter cohort that generates described generation module, obtains effective grade of each parameter group in described parameter cohort;

Update module, for the effective grade according to each parameter group in described parameter cohort, upgrades described parameter cohort;

Select module, select optimized parameter group in the described parameter cohort that upgrades from described update module;

Described update module comprises:

Second converter unit, for the effective grade according to each parameter group in described parameter cohort, converts according to probability each parameter of the parameter group in described parameter cohort respectively, generates several transformation parameter group;

Second test cell, for carrying out eye pattern validity test to several described transformation parameter group;

Second acquisition unit, for the width value of the eye pattern according to described transformation parameter group, obtains effective grade of described transformation parameter group;

Updating block, for according to effective grade of each parameter group in described parameter cohort and effective grade of described transformation parameter group, upgrades described parameter cohort;

Wherein, the parameter cohort after described renewal is that the parameter group that effective higher grade forms, and the number of the parameter group that effective higher grade described in the parameter cohort after described renewal is identical with the number upgrading parameter group in front described parameter cohort;

Judging unit, for judging whether to exist in described parameter cohort the parameter group that effective grade is more than or equal to effective threshold value.

6. the parameter selection apparatus of high-speed differential signal transmission circuit according to claim 5, is characterized in that, described generation module comprises:

First converter unit, for converting according to probability each parameter of described initial parameter group respectively, generates several transformation parameter group;

Assembled unit, for being combined as described parameter cohort by several described initial parameter group and several described transformation parameter group.

7. the parameter selection apparatus of high-speed differential signal transmission circuit according to claim 5, is characterized in that, described test module comprises:

First test cell, for carrying out eye pattern validity test to each parameter group in described parameter cohort;

First acquiring unit, for the width value of the eye pattern according to each parameter group in described parameter cohort, obtains effective grade of each parameter group in described parameter cohort.

8. the parameter selection apparatus of high-speed differential signal transmission circuit according to claim 5, is characterized in that, described selection module comprises:

Comparing unit, for comparing effective grade of the parameter group in the described parameter cohort of renewal;

Selected cell, for select effective grade maximum parameter group as optimized parameter group.