JP2010165102A - Data retrieval device, data retrieval method, and data retrieval program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To shorten an average retrieval time by shortening a determination time of non-matching. <P>SOLUTION: The data retrieval device is provided with: a matching detection means for comparing input data with matching registration data, and outputting a matching detection signal when the matching registration data matched with the input data are detected; a non-matching detection means for comparing a portion of the input data with a portion of preliminarily registered non-matching registration data, or comparing the whole of the input data with the whole of the non-matching registration data, and outputting a non-matching detection signal when the non-matching registration data matched with the input data or determined to be matched with the input data are detected; and a determination means for inputting the matching detection signal and the non-matching detection signal, outputting the determination signal of matching determination when the previously input signal is the matching detection signal, and outputting the determination signal of non-matching determination when it is the non-matching detection signal. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a data search apparatus, a data search method, and a data search program that determine whether or not input data matches registered data.

  Some electronic devices that perform data processing are equipped with a data search device in order to perform processing such as filtering on received data. This data search apparatus inputs part or all of received data as input data, determines whether or not the input data matches any of a plurality of pre-registered data (registered data), and the determination result Is output.

  As the amount of data handled by each user using the Internet increases, it takes a long time from the input of one input data to the output of a determination result in order to process a large amount of received data in the data search device in a short time. There is a need to reduce average time (average search time). Here, in the data search device, the average search time when processing the total number N (N is a natural number) of input data in T seconds (T is a natural number) is represented by T / N.

  The linear search method, which is one of the data search methods, compares registered data with input data one by one in order, and determines that a match is found when registered data that matches the input data is detected. On the contrary, when the input data and all the registration data are compared and matching registration data cannot be detected, it is determined that they do not match. That is, in the linear search method, a match is determined, and a match is determined when the match cannot be determined (unregistered) (Non-Patent Document 1).

  The binary search tree method, which is another data search method, sorts a plurality of registered data having different values in ascending or descending order, compares the registered data in the center of the sorted registered data group with the input data, Narrow down the next search target in half from the size relationship. Then, in the process of narrowing down the search target, it is determined as matching when registration data matching the input data is detected, and it is determined as mismatching when there is no comparison target. That is, even in the binary search tree method, a match is determined as in the linear search method, and a mismatch is determined when a match cannot be determined (unregistered) (Patent Document 1, Non-Patent Document 2). .

FIG. 19 shows a typical configuration example of a conventional data search apparatus.
In the figure, the data search device includes a match detection unit 10 and a determination unit 32. The coincidence detection unit 10 compares the input data 1 with the coincidence registration data, and outputs a coincidence detection signal 2 when the coincidence registration data that coincides with the input data 1 is detected. If not, the comparison end signal 3 is output. When the match detection signal 2 or the comparison end signal 3 is input, the determination unit 32 outputs the match determination determination signal 5 for the match detection signal 2 and does not match the comparison end signal 3 as shown in Table 1. A determination signal 5 for determination is output.

FIG. 20 shows a configuration example of the coincidence detection unit 10.
In the figure, the match detection unit 10 includes a register 40, a match comparison circuit 50, and a match registration data storage unit 60. The input data 1 input to the coincidence detection unit 10 is temporarily held in the register 40 and output as comparison data 111 to the coincidence comparison circuit 50. When the comparison data 111 is input, the match comparison circuit 50 outputs a request signal 112 to the match registration data storage unit 60 that stores a plurality of match registration data, and the match registration data 113 read one by one from the match registration data storage unit 13. And the comparison data 111 are compared. At this time, if the coincidence registration data 113 and the comparison data 111 coincide, the coincidence comparison circuit 50 outputs the coincidence detection signal 2. On the other hand, when there is no coincidence registration data to be read from the registration data storage unit 13, the coincidence comparison circuit 12 outputs a comparison end signal 3.

  Since the conventional data search apparatus determines that there is a mismatch when it cannot be determined as a match, it can only determine a mismatch after comparing the input data with all the match registration data. Therefore, when the mismatch is determined, the search takes the longest time, and in the situation where most of the input data does not match, the average search time becomes long.

  An object of the present invention is to provide a data search device, a data search method, and a data search program that shorten the average search time by reducing the mismatch determination time.

  According to a first aspect of the present invention, in a data search apparatus for determining whether or not input data matches previously registered matching registration data, the input data and the matching registration data are compared, and matching registration data matching the input data is detected. A match detection means for outputting a match detection signal in this case, comparing a part of the input data with a part of the mismatch registration data registered in advance, or comparing all of the input data and all of the mismatch registration data, A mismatch detection unit that outputs a mismatch detection signal when a mismatch registration data that matches or matches the input data is detected, and a match detection signal and a mismatch detection signal are input, respectively, and the previously input signal is a match detection signal. A determination signal for outputting a determination signal for coincidence determination, and a determination means for outputting a determination signal for disagreement determination for a mismatch detection signal.

  The coincidence detection means in the data search device of the first invention is such that when the mismatch detection means outputs a mismatch detection signal, the search processing is stopped by a notification from the determination means or the mismatch detection means, and search processing for the next input data The non-coincidence detection unit is configured to stop the search process by a notification from the determination unit or the match detection unit and perform a search process for the next input data when the match detection unit outputs a match detection signal. It is good.

  The mismatch detection means in the data search device of the first invention may be configured to additionally register the input data as mismatch registration data when the match detection means does not output a match detection signal for the input data.

  The mismatch detection means or the match detection means in the data search device of the first invention includes: a memory means for storing presence / absence information of the data at a numerical address corresponding to the value of the mismatch registration data or the match registration data; and a value of the input data It may be configured to include coincidence comparison means for converting presence / absence information by converting into a read address of the memory means and outputting a mismatch detection signal or a match detection signal for the presence information.

  The inconsistency detection means in the data search device of the first invention divides input data and coincidence registration data into a plurality of divided data and a plurality of division coincidence registration data, respectively, and compares the corresponding divided data with the division coincidence registration data, respectively. If at least one of the sets does not match, a mismatch detection signal may be output.

  The mismatch detection means in the data search device of the first invention is configured to output a search instruction signal to the match detection means when no mismatch detection signal is output with respect to the input data. The match detection means receives the search instruction signal. It is good also as a structure which performs the search process with respect to input data, when it inputs.

  The coincidence detection means holds the input data and also outputs the input data that is searched when outputting the coincidence detection signal. The mismatch detection means holds the input data and outputs the mismatch detection signal. The input data that is the search target is also output when output, and after the output of the mismatch detection signal or search instruction signal, the process proceeds to the search process for the next input data, and the determination means is a match detection signal or mismatch detection The input data input together with the signal may be output together with the determination signal.

  According to a second aspect of the present invention, in the data search method for determining whether or not the input data matches the previously registered match registration data, the match detection means compares the input data with the match registration data and matches the input data. When the registration data is detected, a match detection signal is output, and the mismatch detection means compares a part of the input data with a part of the mismatch registration data registered in advance, or all the input data and all the mismatch registration data Are output, a mismatch detection signal is output when mismatched registration data that matches or matches the input data is detected, and a match detection signal and a mismatch detection signal are input by the judging means, and the previously input signal is detected as a match. If it is a signal, a determination signal for coincidence determination is output, and if it is a mismatch detection signal, a determination signal for mismatch determination is output.

  In the data search method according to the second aspect of the present invention, when the mismatch detection means outputs a mismatch detection signal, the match detection means stops the search process by a notification from the determination means or the mismatch detection means and searches for the next input data. The mismatch detection unit may stop the search process by a notification from the determination unit or the match detection unit and perform a search process for the next input data when the match detection unit outputs a match detection signal. Good.

  The mismatch detection means in the data search method of the second invention may additionally register the input data as mismatch registration data when the match detection means does not output a match detection signal for the input data.

  A third invention is characterized in that each means of the data search device of the first invention is realized by a program executed by a computer.

  The present invention includes a match detection unit that detects a match between input data and match registration data, and a mismatch detection unit that detects a match between mismatch registration data (a mismatch between input data and match registration data). The search result output in is used as a match / mismatch determination output. Thereby, it is possible to perform the mismatch determination without comparing the input data with all the matching registration data. Therefore, even when much of the input data is judged to be inconsistent, the search result can be output in a short time, and the average search time can be shortened compared to the conventional apparatus.

It is a figure which shows the structural example of Example 1 of the data search device of this invention. It is a figure which shows the structural example of the mismatch detection part 20 in Example 1. FIG. It is a figure which shows the structural example of Example 2 of the data search device of this invention. It is a figure which shows the other structural example of Example 2 of the data search device of this invention. It is a figure which shows the structural example of Example 3 of the data search device of this invention. It is a figure which shows the structural example of the mismatch detection part 21 in Example 4. FIG. 5 is a diagram illustrating a configuration example of a mismatched registration data storage unit 62. FIG. FIG. 6 is a diagram for explaining a method of creating mismatch registration data stored in a memory 80. It is a figure which shows the modification of Example 4 of the data search device of this invention. It is a figure which shows the structural example of the mismatch detection part 22 in Example 5. FIG. It is a figure which shows the form of division | segmentation data. It is a figure which shows the form of division | segmentation coincidence registration data. 3 is a diagram illustrating a configuration example of a division mismatch detection unit 23. FIG. It is a figure which shows the structural example of Example 6 of the data search device of this invention. FIG. 10 is a diagram illustrating a configuration example of a coincidence detection unit 11 according to a sixth embodiment. It is a figure which shows the structural example of Example 7 of the data search device of this invention. FIG. 10 is a diagram illustrating a configuration example of a coincidence detection unit 12 according to a seventh embodiment. It is a timing chart which shows the operation example of Example 7 of the data search device of this invention. It is a figure which shows the typical structural example of the conventional data search device. 2 is a diagram illustrating a configuration example of a coincidence detection unit 10. FIG.

  Hereinafter, embodiments of a data search device, a data search method, and a data search program of the present invention will be described in detail based on Examples 1 to 8.

  The data search apparatus according to the first embodiment is characterized in that it searches for matching registration data and mismatching registration data that match input data, and performs matching determination or mismatching determination in parallel.

FIG. 1 shows a configuration example of Embodiment 1 of the data search apparatus of the present invention.
In the figure, the data search apparatus according to the first embodiment includes a match detection unit 10, a mismatch detection unit 20, and a determination unit 30. Input data 1 to be input to the data search device is input to the match detection unit 10 and the mismatch detection unit 20. The coincidence detection unit 10 compares the input data 1 with the coincidence registration data, and outputs a coincidence detection signal 2 when the coincidence registration data that coincides with the input data 1 is detected. When there is no (not registered), the comparison end signal 3 is output. The mismatch detection unit 20 compares the input data 1 with the mismatch registration data, and outputs a mismatch detection signal 4 when the mismatch registration data that matches the input data 1 is detected.

  When the determination unit 30 receives the match detection signal 2, the comparison end signal 3, or the mismatch detection signal 4, as shown in Table 2, the determination unit 30 outputs a match determination determination signal 5 for the match detection signal 2, and the comparison end signal 3 or a mismatch detection signal 4 is output as a mismatch determination signal 5.

  The determination unit 30 is configured to output the determination signal 5 corresponding to the signal input earliest from either the coincidence detection unit 10 or the mismatch detection unit 20, and ignore the signal input thereafter. That is, a determination result as shown in Table 2 is output according to the earlier one of the match detection signal 2 or the comparison end signal 3 output from the match detection unit 10 or the mismatch detection signal 4 output from the mismatch detection unit 20. To do. Thereby, in the data search apparatus of Example 1, a determination result can be output on average faster than the conventional structure which performs a search process only by the coincidence detection part 10, and average search time can be shortened.

  Next, configuration examples of the match detection unit 10 and the mismatch detection unit 20 will be described. Since the match detection unit 10 has the same configuration as the match detection unit 10 in the conventional data search apparatus shown in FIG. .

FIG. 2 shows a configuration example of the mismatch detection unit 20 in the first embodiment.
In the figure, the mismatch detection unit 20 includes a register 40, a match comparison circuit 51, and a mismatch registration data storage unit 61. The input data 1 input to the mismatch detection unit 20 is temporarily held in the register 40 and output as the comparison data 111 to the match comparison circuit 51. When the comparison data 51 is input, the match comparison circuit 51 outputs a request signal 112 to the mismatch registration data storage unit 61 storing a plurality of mismatch registration data, and the mismatch registration data 114 read out from the mismatch registration data storage unit 61 one by one. And the comparison data 111 are compared. At this time, if the mismatch registration data 114 and the comparison data 111 match, the match comparison circuit 51 outputs the mismatch detection signal 4. If the mismatch registration data that matches the input data 1 is not registered, the match comparison circuit 51 outputs nothing.

  Here, a modification of the first embodiment will be described. This modification can be similarly applied to other embodiments described below.

  The match detection unit 10 and the mismatch detection unit 20 described in the first embodiment assume a configuration corresponding to the linear search method, but the configuration is not limited to this, and for example, a configuration corresponding to the binary search tree method It may be. Further, the match detection unit 10 and the mismatch detection unit 20 may be configured to correspond to different search methods.

  The mismatch detection unit 20 holds not only the mismatch detection signal 4 but also all types of mismatch registration data, and if there is no mismatch registration data that matches the input data 1 (unregistered), The determination unit 30 may output the determination signal 5 for determining the coincidence with respect to the comparison end signal.

  The non-matching registration data storage unit 61 of the non-matching detection unit 20 may be configured not to hold all types of non-matching registration data, but to hold only non-matching registration data that is frequently used, for example. Further, of the n-bit mismatch registration data, for example, the upper (n−1) bits may be held as the mismatch registration data and compared with the upper (n−1) -bit comparison data 111 of the input data 1. Further, not only simply truncating the number of bits of mismatched registration data, but also the number of bits of mismatched registration data may be reduced using a hash function or the like. As a result, the number or data amount of inconsistent registration data can be reduced, and the effects of reducing memory capacity, improving operation speed, and reducing power consumption can be obtained while ensuring the effect of shortening the average search time. .

  The match detection unit 10 and the mismatch detection unit 20 may be configured to count the number of matches for each of the match registration data and the mismatch registration data and perform a search in descending order of the count number. Further, a function of rearranging the matching registration data and the mismatching registration data, and a function of deleting the matching registration data and the mismatching registration data that are less frequently used may be provided. Thereby, when a plurality of input data are continuously input, the average search time can be shortened.

  When adding match registration data, when the match registration data is input to the mismatch detection unit 20 in advance and the mismatch detection signal 4 is output, the match registration data is deleted from the mismatch registration data. The data is stored in the match registration data storage unit 60 of the match detection unit 10. Similar processing may be performed when adding mismatched registration data. Thereby, duplication of coincidence registration data and non-coincidence registration data can be avoided.

  The data search apparatus according to the first embodiment outputs the determination signal 5 for matching determination or non-matching determination, but may output related data instead of the determination signal 5 for matching determination. For example, if the related data is an output port, a function as a router can be added, and if the related data is an output queue, a function as priority control can be added. The related data is output together with the match registration data (113 in FIG. 20) from the match registration data storage unit (60 in FIG. 20) of the match detection unit 10, and is output to the determination unit 30 together with the match detection signal 2. It is output instead of the determination signal 5 when the unit 30 performs the coincidence determination.

  The data search apparatus according to the second embodiment searches for match registration data and mismatch registration data that match the input data, and after performing match determination or mismatch determination, ends the search operation of the match detection unit 10 and the mismatch detection unit 20, It is possible to search for the next input data.

FIG. 3 shows a configuration example of Embodiment 2 of the data search apparatus of the present invention.
In the figure, the data search apparatus according to the second embodiment includes a coincidence detection unit 10, a mismatch detection unit 20, and a determination unit 30 that have the same basic functions as those of the first embodiment. The determination unit 30 according to the second embodiment outputs a determination signal 5 with respect to the input of the mismatch detection signal 4 and also outputs a comparison stop signal 6 that causes the match detection unit 10 to stop comparing the input data with the match registration data. . The determination unit 30 according to the second embodiment outputs a determination signal 5 corresponding to the input of the coincidence detection signal 2 or the comparison end signal 3 and causes the mismatch detection unit 20 to stop comparing the input data with the mismatch registration data. The comparison stop signal 7 is output.

  As described above, according to the second embodiment, after the matching determination or the mismatching determination is performed on the input data, the data search process can be promptly terminated and the search process for the next input data can be performed. Thereby, when a plurality of input data are continuously input, the average search time can be shortened.

  In the second embodiment illustrated in FIG. 3, the determination unit 30 outputs a comparison stop signal to the coincidence detection unit 10 or the disagreement detection unit 20. However, as illustrated in FIG. A configuration may also be employed in which a comparison stop signal is mutually output with the unit 20. That is, the mismatch detection unit 20 outputs the mismatch detection signal 4 and also outputs the comparison stop signal 8 to the match detection unit 10. The coincidence detection unit 10 outputs the coincidence detection signal 2 or the comparison end signal 3 and also outputs a comparison stop signal 9 to the inconsistency detection unit 20.

  The data search apparatus according to the third embodiment searches for coincidence registration data that matches input data, and registers the input data as inconsistency registration data in the inconsistency detection unit 20 when the input data is not registered as coincidence registration data. It features a learning function for inconsistent data.

FIG. 5 shows a configuration example of Embodiment 3 of the data search apparatus of the present invention.
In the figure, the data search apparatus according to the third embodiment includes a coincidence detection unit 10, a mismatch detection unit 20, and a determination unit 30 whose basic functions are the same as those of the first embodiment. Here, it is assumed that the input data to be determined to be inconsistent is not registered as the mismatch registration data of the mismatch detection unit 20. That is, when the mismatch detection signal 4 is not output from the mismatch detection unit 20 for this input data, the match detection unit 10 outputs the comparison end signal 3, and the determination unit 30 outputs the determination signal 5 of the mismatch determination It is.

  The coincidence detection unit 10 outputs the comparison end signal 3 and also outputs the update signal 201 to the inconsistency detection unit 20. The mismatch detection unit 20 registers the input data 1 as mismatch registration data in response to the update signal 201, and uses the registered mismatch registration data registered for the next input data 1 and the previously registered mismatch registration data. Search for. As described above, since the data actually determined to be mismatched is used as the mismatch registration data, the mismatch determination can be performed in a short time even when the number of mismatch registration data to be registered is small, and the average search time can be shortened. In addition, since the number of inconsistent registration data can be reduced, it is possible to obtain the effects of reducing memory capacity, improving operation speed, and reducing power consumption.

  When the input data is already registered as the mismatch registration data of the mismatch detection unit 20, the mismatch detection unit 20 outputs the mismatch detection signal 4, and the match detection unit 10 outputs the comparison end signal 3 and the update signal 201. Will be output. In this case, the mismatch detection unit 20 ignores the update signal 201. Alternatively, as shown in the second embodiment, the output of the update signal 201 may be stopped using the comparison stop signal, or the operation corresponding to the update signal 201 may be stopped.

  The mismatch detection unit 20 according to the first embodiment reads the mismatch registration data from the mismatch registration data storage unit, compares it with the input data, and outputs the mismatch registration signal 4 when they match. The mismatch detection unit of the fourth embodiment reads the presence / absence signal indicating whether or not the mismatch registration data matching the input data is registered from the mismatch registration data storage unit, and the mismatch detection signal when the presence / absence signal indicates “present” 4 is output.

FIG. 6 shows a configuration example of the mismatch detection unit 21 in the fourth embodiment.
In the figure, the mismatch detection unit 21 includes a register 40, a match comparison circuit 52, and a mismatch registration data storage unit 62. The input data 1 input to the mismatch detection unit 21 is temporarily held in the register 40 and output as the comparison data 111 to the match comparison circuit 52. When the comparison data 111 is input, the match comparison circuit 52 outputs the comparison data 115 converted into the address of the memory constituting the mismatch registration data storage unit 62. The mismatched registration data storage unit 62 holds information on the presence / absence of registration / unregistration by associating the memory address with the mismatched registration data, and a presence / absence signal corresponding to the presence / absence of mismatched registration data from the address indicated by the comparison data 115 116 is read and output to the coincidence comparison circuit 52. The coincidence comparison circuit 52 outputs the mismatch detection signal 4 if the presence / absence signal 116 indicates “present”.

FIG. 7 shows a configuration example of the mismatch registration data storage unit 62.
In the figure, the mismatch registration data storage unit 62 is constituted by a memory 80. The memory 80 stores information indicating “present” at an address equal to the value of the mismatched registration data, and stores information indicating “absent” at other addresses. The comparison data 115 input to the mismatch registration data storage unit 62 serves as a read address of the memory 80, and outputs a presence / absence signal 116 indicating the presence / absence of mismatch registration data corresponding to the value of the comparison data 115.

  FIG. 8 shows a method for creating the mismatched registration data stored in the memory 80. Here, an example in which mismatched registration data is created from matched registration data is shown. When four types of numerical values 20, 35, 198, and 248 are given as coincidence registration data, information indicating “none” is stored at an address equal to the value of the coincidence registration data in the memory 80, and other information Information indicating “present” is stored in the address. The mismatch registration data is updated when the match registration data is updated. That is, when adding the matching registration data, information indicating “none” is written at an address equal to the value of the matching registration data to be added. On the other hand, when deleting the coincidence registration data, information indicating “present” is written at an address equal to the value of the coincidence registration data to be deleted.

  Note that the value of the coincidence registration data may be converted into a hash value, and information indicating “none” may be stored in the address corresponding to the hash value. In this case, the coincidence comparison circuit 52 outputs comparison data 115 obtained by converting the comparison data 111 into a hash value.

  With the configuration of the mismatch registration data storage unit 62 shown in FIGS. 6 to 8, when the input data 1 is determined to be mismatched, the presence / absence signal 116 indicates “present”, and the match comparison circuit 52 indicates the mismatch detection signal 4. Is output. Conversely, if the input data 1 is determined to match, the presence / absence signal 116 indicates “none”, and the match comparison circuit 52 does not output the mismatch detection signal 4 and ends the search process for the input data 1.

  Note that since the memory 80 can be configured by a general RAM instead of a so-called CAM (associative memory), it is possible to expect a cost reduction effect by reducing the circuit scale and power consumption.

  Further, the mismatch registration data storage unit 62 that outputs the presence / absence signal 116 using the comparison data 115 as a read address uses an array and a pointer when the fourth embodiment is applied to software described in a program language such as C language. It may be a method.

  Further, since the mismatch detection unit 21 of the fourth embodiment can detect input data that matches the mismatch registration data in one memory read time, the average search time can be greatly shortened. Hereinafter, a specific example will be described.

It is assumed that one cycle time is required to read data from the memory, the number of coincidence registration data is M, and a total number N of input data is searched. Further, if there are p pieces of input data that match in the time of c cycles in the N pieces of input data, the total search time V cycle according to the existing search method takes M cycles until a mismatch is determined.
V = (p * c + M * (N−p)) / N
It becomes.

On the other hand, when the coincidence detecting unit 10 is realized by the linear search method and the inconsistency detecting unit 21 is realized by the method of the fourth embodiment, if there are z input data that can determine the inconsistency in one cycle, the total search time W cycle is ,
W = (p * c + z + M * (N−p−z)) / N
It becomes. Here, when z ≧ 0 and N ≧ 1,
V−W = z * (M−1) / N ≧ 0
Therefore, it can be seen that the search time can be shortened by the configuration of the fourth embodiment.

  The configuration using the memory 80 of the mismatch detection unit 21 according to the fourth embodiment can be similarly applied to the match detection unit 20. In this case, the memory of the match registration data storage unit of the match detection unit 20 and the data of the memory 80 of the mismatch detection data storage unit 62 of the mismatch detection unit 21 have the information of each address “present” and “no”. "The reverse.

  Further, the coincidence comparison circuit 52 shown in FIG. 6 outputs the mismatch detection signal 4 when the presence / absence signal 116 indicates “present”, and outputs the match detection signal 2 when the presence / absence signal 116 indicates “absence”. Then, the coincidence detection unit 10 and the mismatch detection unit 21 can be shared. That is, as shown in FIG. 9, the data search apparatus can be configured by the match / mismatch detection unit 15 and the determination unit 30 in which the functions of the mismatch detection unit 21 and the match detection unit 10 are realized by a configuration including one memory. .

  The mismatch detection unit according to the fifth embodiment divides input data and match registration data into a plurality of pieces, and outputs a mismatch detection signal 4 if any of the divided input data does not match.

FIG. 10 shows a configuration example of the mismatch detection unit 22 in the fifth embodiment.
In the figure, the mismatch detection unit 22 includes a data division circuit 41, a plurality of t division mismatch detection units 23-1 to 23-t, and a totaling unit 90. The n-bit input data 1 input to the mismatch detection unit 22 is t-divided into m-bit divided data 1-1 to 1-t (n = m × t) as shown in FIG. Are input to the division mismatch detection units 23-1 to 23-t, respectively. The division mismatch detection units 23-1 to 23-t have m-bit division match registration data 113-1 to 113-t obtained by dividing the n-bit match registration data 113 by t as shown in FIG. When there is a mismatch with the divided data 1-1 to 1-t, the division mismatch detection signals 4-1 to 4-t are output. The division mismatch detection signals 4-1 to 4-t are counted by the counting unit 90, and the mismatch detection signal 4 is output when at least one of the division mismatch detection signals 4-1 to 4-t is input.

  Note that the input data and the coincidence registration data may not be equally divided, and the divided input data and the coincidence registration data may have any number of bits corresponding to each other.

  In the example shown in FIGS. 11 and 12, since the divided data 1-2 is “0” and the divided match registration data 113-2 is “120”, the divided mismatch detection unit 23-2 sends the divided mismatch detection signal 4-2. Is output, and the counting unit 90 outputs the mismatch detection signal 4 on the assumption that the input data 1 does not match the matching registration data 113.

FIG. 13 shows a configuration example of the division mismatch detection unit 23.
In the figure, the division mismatch detection units 23-1 to 23-t include match registration data storage units 81-1 to 81-t configured by a memory as in the fourth embodiment. The coincidence registration data 113 is divided into t, and information indicating “present” is written in an address equal to each value, and “absent” is written in other addresses. The divided data 1-1 to 1-t are input as addresses, and if the corresponding information is “none”, the division mismatch detection signals 4-1 to 4-t are output.

  The mismatch detection unit 22 according to the fifth embodiment can reduce the number of mismatch registration data to be held as compared with the mismatch detection unit 21 according to the fourth embodiment, and can reduce costs due to a reduction in memory capacity, an improvement in operation speed, and a reduction in power consumption. Reduction effect can be expected.

  In the data search apparatus according to the first embodiment, the match detection unit 10 and the mismatch detection unit 20 perform search processing on input data in parallel. The data search apparatus according to the sixth embodiment is characterized in that the mismatch detection unit first performs a search process on the input data, and the match detection unit performs the search process when the input data does not match the mismatch registration data.

FIG. 14 shows a configuration example of Embodiment 6 of the data search apparatus of the present invention.
In the figure, the data search device according to the sixth embodiment includes a match detection unit 11, a mismatch detection unit 22, and a determination unit 30. The mismatch detection unit 22 outputs the search instruction signal 202 to the match detection unit 11 when the mismatch registration data that matches the input data 1 is unregistered and does not output the mismatch detection signal 4 to the determination unit 30. The match detection unit 11 starts searching when the search instruction signal 202 is input, and outputs the match detection signal 2 or the comparison end signal 3 to the determination unit 30.

FIG. 15 illustrates a configuration example of the coincidence detection unit 11 according to the sixth embodiment.
In the figure, the match detection unit 11 includes a register 40, a match comparison circuit 53, and a match registration data storage unit 60. The input data 1 input to the match detection unit 11 is temporarily held in the register 40 and is output as the comparison data 111 to the match comparison circuit 53. The match comparison circuit 53 outputs a request signal 112 to the match registration data storage unit 60 when the search instruction signal 202 and the comparison data 111 are input, and the match registration data 113 read one by one from the match registration data storage unit 60. And the comparison data 111 are compared. At this time, if the coincidence registration data 113 and the comparison data 111 coincide, the coincidence comparison circuit 53 outputs the coincidence detection signal 2. On the other hand, when there is no match registration data to be read from the match registration data storage unit 60, the match comparison circuit 53 outputs a comparison end signal 3.

  As described above, in the data search device according to the sixth embodiment, the coincidence detection unit 11 executes the process only when the mismatch detection unit 22 does not detect a mismatch. When the mismatch detection signal 4 is input from the mismatch detection unit 22, the determination unit 30 outputs the determination signal 5 of the mismatch determination. When the mismatch detection signal 4 is not input, the determination unit 30 outputs the match detection signal output from the match detection unit 11. 2 or a comparison end signal 3 is used to output a determination signal 5 for determination of coincidence or disagreement. Thereby, power consumption can be reduced as compared with the parallel operation of the coincidence detection unit 11 and the mismatch detection unit 22.

  When the mismatch detection unit 22 outputs the mismatch detection signal 4, the determination unit 30 or the mismatch detection unit 22 may be controlled to stop the operation of the match detection unit 11 as in the second embodiment.

  In addition to the function of the data search device of the sixth embodiment, the data search device of the seventh embodiment temporarily holds the input data and searches the input data to be searched together with the determination signal 5 for the match determination or the mismatch determination. It is output as data.

FIG. 16 shows a configuration example of Embodiment 7 of the data search apparatus of the present invention.
In the figure, the data search apparatus according to the seventh embodiment includes a match detection unit 12, a mismatch detection unit 23, and a determination unit 31. The mismatch detection unit 23 outputs a mismatch detection signal 4 when detecting a match between the input data 1 and the mismatch registration data, and simultaneously outputs the input data 1 to be searched as the search target data 204. The mismatch detection unit 23 outputs the search instruction signal 202 to the match detection unit 12 when the mismatch registration data that matches the input data 1 is not registered and the mismatch detection signal 4 is not output to the determination unit 31.

  The match detection unit 12 starts searching for the input data 1 when the search instruction signal 202 is input, and outputs the match detection signal 2 or the comparison end signal 3 to the determination unit 31. Further, when outputting the match detection signal 2 or the comparison end signal 3, the match detection unit 12 outputs the search target input data 1 as the search target data 203.

  The determination unit 31 outputs a match determination determination signal 5 according to the match detection signal 2, or outputs a mismatch determination determination signal 5 according to the comparison end signal 3 or the mismatch detection signal 4. Alternatively, the search target data 204 is output as the search target data 205 as it is.

FIG. 17 illustrates a configuration example of the coincidence detection unit 12 in the seventh embodiment.
In the figure, the match detection unit 12 includes a register 40, a buffer circuit 70, a buffer control circuit 71, a match comparison circuit 54, and a match registration data storage unit 60. The input data 1 input to the coincidence detection unit 11 is temporarily held in the register 40 and output as comparison data 111 to the buffer circuit 70. The buffer circuit 70 stores the comparison data 111 when the search instruction signal 202 is input, and outputs the data stored when the read signal 123 is input from the buffer control circuit 71 to the buffer control circuit 71 as the comparison data 124.

  When the comparison enable signal 125 is input from the coincidence comparison circuit 54, the buffer control circuit 71 outputs a read signal 123 to the buffer circuit 70 and reads data stored in the buffer circuit 70 as comparison data 124. Further, the buffer control circuit 71 outputs the comparison data 124 as the comparison data 126 to the coincidence comparison circuit 54 and holds the comparison data 126 until the next comparison enable signal 125 is input.

  When the comparison data 126 is input, the match comparison circuit 54 outputs a request signal 112 to the match registration data storage unit 60 and compares the match registration data 113 read one by one from the match registration data storage unit 60 with the comparison data 126. . At this time, if the coincidence registration data 113 and the comparison data 126 coincide, the coincidence comparison circuit 54 outputs the coincidence detection signal 2. On the other hand, when there is no coincidence registration data to be read from the coincidence registration data storage unit 60, the coincidence comparison circuit 54 outputs a comparison end signal 3. When the coincidence comparison circuit 54 outputs the coincidence detection signal 2 or the comparison end signal 3, the coincidence comparison circuit 54 outputs the comparison target data 126 to be searched as the search target data 203 and sends the next comparison enable signal 125 to the buffer control circuit 71. Output.

Here, an operation example of the data search apparatus according to the seventh embodiment will be described with reference to the timing chart of FIG.
The input data 1 is input to the coincidence detection unit 12 and the disagreement detection unit 23, and the disagreement detection unit 23 first performs a search. Here, it is assumed that the input data 1 is a, b, c, the input data a, c are determined to match, and the input data b is determined to be mismatched.

  The mismatch detection unit 23 temporarily holds the input data a in a register, and outputs a mismatch detection signal 4 when the match between the input data a output from the register and the mismatch registration data is detected, and the input data a Output as searched data 204. The determination unit 31 outputs a determination signal 5 for mismatch determination and data to be searched 205 for the input data a. Next, the mismatch detection unit 23 searches similarly for the input data b, and outputs a search instruction signal 202 to the match detection unit 12 when no match with the mismatch registration data is detected. Next, the mismatch detection unit 23 similarly starts searching for the input data c. In this way, the mismatch detection unit 23 starts the search process for the next input data immediately after the process for the input data 1 is completed, regardless of whether a mismatch is detected or a mismatch is not detected.

  On the other hand, the register 40 of the coincidence detection unit 12 inputs the input data a, b, and c and outputs the input data as comparison data 111 to the buffer circuit 70. The buffer circuit 70 is input when the search instruction signal 202 is input. Data b is stored. At this time, since the buffer control circuit 71 receives the comparison enable signal 125 and the buffer circuit 70 receives the read signal 123, the buffer circuit 70 reads the input data b and outputs it as the comparison data 124 to the buffer control circuit 71. Further, the buffer control circuit 71 outputs the comparison data 126 to the coincidence comparison circuit 54. When the buffer control circuit 71 outputs the input data b as the comparison data 126, the read signal 123 for the buffer circuit 70 is turned off and the input data b is held.

  The match comparison circuit 54 outputs a request signal 112 to the match registration data storage 60 and starts a search to determine whether or not the match registration data 113 read out matches the input data b. When the match comparison circuit 54 detects a match between the match registration data 113 and the input data b, the input data b is output as the search target data 203 together with the match detection signal 2. Similarly, when the comparison end signal 3 is output, the input data b is output as the search target data 203. When the search processing is completed, the match comparison circuit 54 turns on the comparison enable signal 125 and reads the comparison data 124 stored in the buffer circuit 70 via the buffer control circuit 71. This comparison data 124 is input data for which no mismatch was detected by the mismatch detection unit 23, and similarly enters a search process for matching registration data.

  The determination unit 31 outputs a determination signal 5 for a match determination or a mismatch determination based on signals output from the match detection unit 12 and the mismatch detection unit 23, and outputs the search target data 203 or the search target data 204 as the search target data 205. To do.

  In the timing chart shown in FIG. 18, the determination signal 5 for the mismatch determination for the input data a and c is output first, and the determination signal 5 for the determination of the match for the input data b is output later. That is, the input order of input data is different from the order in which the determination results are output, but since it is output together with the search target data 205, there is no particular problem in the processing based on the determination result of the match or mismatch in the subsequent processing unit. . Alternatively, the determination unit 31 may be provided with a buffer circuit, and the determination result may be output in the input order of the input data.

  Further, since the search operation of the match detection unit 12 and the mismatch detection unit 23 is independent from each other as described above, search results for different input data may be output to the determination unit 31 at the same time. In this case, for example, the determination unit 31 temporarily stores the output from the mismatch detection unit 23, preferentially selects the signal from the match detection unit 12, performs the determination process, and then the mismatch detection unit 23 A determination process may be performed on the signal. Note that the processing order of the outputs of the coincidence detection unit 12 and the mismatch detection unit 23 may be reversed.

  In the sixth embodiment, when the mismatch detection unit 22 cannot detect a mismatch, the mismatch detection unit 22 cannot process the next input data until the process of the match detection unit 12 is completed. In the seventh embodiment, even when the match detection unit 12 performs a search process for the input data b, the mismatch detection unit 23 can perform a search process for the next input data c. Therefore, in the configuration of the seventh embodiment, when most of the input data is determined to be inconsistent, the average search time can be further shortened and the power consumption can be reduced as compared with the other embodiments.

  The configurations and functions of the first to seventh embodiments described above can be realized not only by hardware but also by software described in a program language and a computer. Further, the program can be recorded on a recording medium or provided through a network.

  INDUSTRIAL APPLICABILITY The present invention is useful as a data search apparatus and method for shortening the average search time when a lot of input data is judged to be inconsistent.

10, 11, 12 Match detection unit 15 Match / mismatch detection unit 20, 21, 22, 23 Mismatch detection unit 23 Division mismatch detection unit 30, 31 determination unit 40 Register 41 Data division circuit 51, 52, 53, 54 Match comparison circuit 61, 62 Mismatch registration data storage unit 70 Buffer circuit 71 Buffer control circuit 80, 81 Memory 90 Totaling unit

JP-A-10-126442

David E. Taylor, "Survey and Taxonomy of Packet Classification Techniques", ACM Computing Surveys, Vol. 37, No. 3, September 2005, pp. 238-275 Yumiba, Hoshi, "Heading Search Technique Using Tree Structure", Information Processing, Vol.21, No.1, January 1980, pp.28-49

Claims (11)

In the data search device for determining whether or not the input data matches the registered registration data registered in advance,
A match detection means for comparing the input data with the match registration data and outputting a match detection signal when the match registration data matching the input data is detected;
Compare the part of the input data with a part of the pre-registered non-matching registration data, or compare the whole of the input data with the whole of the non-matching registration data, and match the input data with the non-matching Mismatch detection means for outputting a mismatch detection signal when registration data is detected;
The coincidence detection signal and the mismatch detection signal are respectively input, and if the previously input signal is the coincidence detection signal, a coincidence determination determination signal is output. If the previously input signal is the disagreement detection signal, a mismatch determination determination signal is output. A data search apparatus comprising: a determination unit that performs the determination. The data search device according to claim 1,
The coincidence detection unit is configured to perform a search process for the next input data by stopping the search process by a notification from the determination unit or the mismatch detection unit when the mismatch detection unit outputs the mismatch detection signal. Yes,
The mismatch detection means is configured to stop the search process by a notification from the determination means or the match detection means and perform a search process for the next input data when the match detection means outputs the match detection signal. A data retrieval device characterized by being. The data search device according to claim 1,
The data search device, wherein the mismatch detection means is configured to additionally register the input data as mismatch registration data when the match detection means does not output the match detection signal for the input data. The data search device according to claim 1,
The mismatch detection means or the match detection means includes:
Memory means for storing presence / absence information of the data at a numerical address corresponding to the mismatch registration data or the value of the match registration data;
A match comparison unit that converts the value of the input data into a read address of the memory unit, reads the presence / absence information, and outputs the mismatch detection signal or the match detection signal with respect to presence information. A data search device that is characterized. The data search device according to claim 1,
The mismatch detection means divides the input data and the match registration data into a plurality of divided data and a plurality of divided match registration data, respectively, compares the corresponding divided data with the divided match registration data, and at least one set thereof. The data search device is characterized in that if there is a mismatch, the mismatch detection signal is output. The data search device according to claim 1,
The mismatch detection means is configured to output a search instruction signal to the match detection means when not outputting the mismatch detection signal for the input data,
The coincidence detection means is configured to perform a search process on the input data when the search instruction signal is input. The data search device according to claim 6, wherein
The coincidence detecting means is configured to hold the input data and also output the input data to be searched when outputting the coincidence detection signal,
The mismatch detection means holds the input data and also outputs the input data to be searched when outputting the mismatch detection signal, and outputs the next input after outputting the mismatch detection signal or the search instruction signal. It is a configuration that shifts to search processing for data,
The data search device, wherein the determination unit is configured to output the input data input together with the match detection signal or the mismatch detection signal together with the determination signal. In a data search method for determining whether or not input data matches previously registered match registration data,
The match detection means compares the input data with the match registration data, and outputs a match detection signal when the match registration data that matches the input data is detected,
The mismatch detection means compares a part of the input data with a part of the mismatch registration data registered in advance, or compares all of the input data with all of the mismatch registration data to match or match the input data. A mismatch detection signal is output when the mismatch registration data considered to be
The determination means inputs the match detection signal and the mismatch detection signal, and outputs a match determination determination signal if the previously input signal is the match detection signal, and determines a mismatch determination if the signal is the mismatch detection signal. A data search method characterized by outputting a signal. The data search method according to claim 8,
When the mismatch detection means outputs the mismatch detection signal, the match detection means stops the search process by a notification from the determination means or the mismatch detection means and performs a search process for the next input data,
The mismatch detection means, when the match detection means outputs the match detection signal, stops the search process by a notification from the determination means or the match detection means and performs a search process for the next input data. Characteristic data search method. The data search method according to claim 8,
The data search method, wherein the mismatch detection means additionally registers the input data as mismatch registration data when the match detection means does not output the match detection signal for the input data.   A data search program characterized in that each means of the data search device according to any one of claims 1 to 7 is realized by a program executed by a computer.

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