JPS6320627A - Group number generating mechanism - Google Patents

Abstract

PURPOSE:To register string search devices whose number exceeds a maximum number of registerable string search devices, by providing a function which generates the address of a memory, where the group number corresponding to an input symbol string is written, with an upper address and a lower address to read out the group number from this memory. CONSTITUTION:Addresses of all terminals which are stored in respective nodes of a loop packed transmission line 21 and are connected to a bus CSMA/CD are registered as symbol strings registered in the string search device of a group number generating mechanism in a node 22. The designation address of the frame received from the bus CSMA/CD is inputted to a symbol string classifier input line. Group numbers which are addresses of terminals connected to respective nodes are registered correspondingly to each other so that the group number obtained immediately after input indicates the node address of the node connected to the loop packed transmission line 21. Thus, a waste of the storage area is reduced, and the retrieval and collation time is shortened, and the real time processing is possible.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a method for classifying symbol strings, and in particular to a method for determining which group an input symbol string belongs to among pre-registered symbol string groups. Regarding the method.

[Conventional technology]

Conventionally, as a method for searching and classifying symbol strings of this type, the storage address of a general-purpose memory element or storage device and the symbol string to be registered are assigned one-to-one.The storage area stores the corresponding group number, and the input A method for reading a group number from a storage area indicated by a symbol string, and a linear search method in which a table consisting of symbol strings and corresponding group numbers is provided in the storage area of a general-purpose memory element or storage device.

Badge-Search Method There is a method in which a symbol string in a table is sequentially searched according to a search algorithm such as a binary search method, and when a symbol string matches an input symbol string, a corresponding group number is obtained from the table. Recently, a symbol string search and matching technology using a programmable sequential logic circuit consisting of a sequential circuit and a memory circuit, which can be realized as an LSI, has been announced (rA NEW 5
TINGSEA 几CHHARDWARE ARCHI
TECTU EFORVLSI j K, Takaha
shi et al., Proceedings of the
13th Symposium on Computer
ter Architecture, PP, 20-
27.1986°6.2-6.5). This is an LSI
This is called a string search device.

e. - This string search device is capable of registering at least one or more finite number of symbol strings, and simultaneously matches input symbol strings input sequentially from the outside in symbol units with all registered symbol strings. It has a function of outputting a match signal indicating a match and a registered address signal of all the matched symbol strings when only one f in the n registered symbol strings matches.

[Problem that the invention seeks to solve]

In the above-mentioned conventional general-purpose memory element or storage device, the storage address and the symbol string to be registered are assigned as a pair by storing the corresponding group number in the storage area, and then assigning the symbol string from the storage area indicated by the input symbol string. In the method of reading group numbers, if the symbol strings to be registered and searched are general symbol strings with no regularity, the number of storage areas required is equal to the number of input symbol strings and the number of states obtained. Therefore, a considerably large storage area is generally required compared to the number of symbol strings to be registered and searched.

Another problem is that the method of providing a table consisting of symbol strings and corresponding group numbers in a storage area of a general-purpose memory element or storage device and sequentially searching according to a search algorithm cannot process the data in real time. Furthermore, the string search device can search and match the input symbol string and all the registered symbol strings in real time simultaneously, and output the registered address of the matched registered symbol string. Although it is possible to perform grouping from this registered address output, there is a problem in that it is impossible to register the maximum possible number of registrations for one string search device.

[Means for solving problems]

The group number generation mechanism of the present invention registers one symbol string, determines whether the input symbol string belongs to any of n groups, and if it belongs, performs processing to obtain the group number. In the implementation ff, a means for registering m symbol strings is used, and the registered symbol strings and the symbol strings sequentially inputted from the outside are compared in parallel in real time, and if they match, a matching signal is sent together with a matching signal. A device having means for outputting the registered address of a matched symbol string is ('-)+1, the matching signal output of the device is input, and a device having [-fl]+1 input and outputting the matching signal. The encoder that outputs the number and the output of the encoder are set as the upper address and the above (
-fl)+1 storage address outputs of the device are logically connected, and this is the lower address, and the memory in which the group number corresponding to the registered address of the symbol string registered in the device is written. The above ('-)+ is registered in the above-mentioned devices without duplication of symbol strings, and the input symbol string is simultaneously inputted into the above-mentioned [-fl:]+z devices, and the input symbol string is A group number corresponding to the input symbol string is written by an upper address of the memory obtained via an encoder from a matching signal of the device having a matched registered symbol string and a lower address of the memory obtained from the registered address. It has a function of generating the address of the memory in which the memory is located and reading the group number from the memory.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention. In this embodiment, a means for registering a symbol string is provided, and a registered symbol string and a symbol string sequentially inputted from the outside are compared in parallel in real time, and if they match, a matching signal is sent and the matched registered symbol string is registered. A string search device is used as an example of a device having means for outputting an address.

One embodiment of the present invention provides an input line 11 for inputting an input symbol string.
, - symbol is 16 bits, and the symbol string of maximum 8 symbols is 64 bits.
A string search device 12 that can be individually registered, a match signal line 13 that is output when the registered symbol string of the string search device 12 matches the input symbol string input from the input line 11, and a match signal from the match signal line 13. a registered address output line 14 which is OR-connected the registered address outputs of the matched registered symbol strings outputted together with respect to all string search devices; an encoder 15 which inputs the matching signal of each string search device and outputs a binary code;
A group number corresponding to the registered address of the registered symbol string is written in the binary code output line 16 of the encoder 15 for each string search device, and the output from the registered address output line 14 is set as the lower address of the memory 17, and the encoder 15 It has a memory 17 that outputs the binary code output 16 of 1 to an upper address of the memory 17, and a group number output line 18 that outputs a group number corresponding to the registered address of each string search device in the memory 17.

All of the symbol strings that constitute the constituent elements of a group are registered in advance in the all string search device without duplication, and input symbol strings are sequentially input symbol by symbol from the signal line 11 to the all string search device. The string search device 12 receives the input symbol string and the stored 64
registered symbol strings in parallel in real time each time one symbol is input. A string search device that does not match any of the stored registered symbol strings outputs the value 0 to the - matching signal line 13 and outputs the registered address? 14Kf'
It does not output the i value and enters a high impedance state. A string search device that matches any of the stored registration symbol strings outputs a value 1 to the match signal line 13 and outputs the registration address of the matched registration V and code string to the registration address output line 14.

Since the symbol strings registered in each string search device do not overlap, only one string search device has a registered symbol string that matches one input symbol string. Therefore, input the value 1 to the encoder 15 from the matching line 13 of the string search device, and input the value 1 to the encoder 15, and
The value (l
j large input, the output of the encoder 15 outputs the number of the string search device to the binary code output line 16, giving the upper address of the memory 17, and the registered address output line 14 of the string search device. is memory 1
Give the lower address of 7. The data in the memory 17 indicated by the address of the memory 17 thus given is written in advance with the group number corresponding to the registered address for each string search device, and then sent to the group number output line 18 of the memory 7. You can get the group number to which the input symbol string belongs. What is the input symbol string) I
If the symbol string does not match the registered symbol string of the Jing search device, all inputs to the encoder become 0, and the value 0 is output to the output line 16 of the encoder. Therefore, memory 1
By registering in advance a group that does not belong to any group as one group number in the address space that is the upper address O of 7, it is possible to know that the input symbol string is a group that does not belong to any group. can.

Next, an embodiment of a communication network to which the group number generation mechanism shown in FIG. 1 is applied will be described with reference to FIG. 2. In this embodiment, a ring-shaped packet transmission path 21 and nodes 22 and 23 whose respective node addresses on the protocol of the ring-shaped packet transmission path 21 are Y and X, respectively, are communication media with the same physical characteristics. , each separated from each other by COM
A/CD bus 24°25, and CS MA
/ has a terminal 26.27 connected to the CD bus 24.25. The address on the CSMA/CD bus protocol of the terminal 27 is represented by A. 30 is the transmission frame of the terminal 26, 4° is the transmission frame of the node 22, 50H
Each frame received by the terminal 27 is represented. Furthermore, the frame 30 has a destination address field (DA') 3+, an information field (INF') 32, and a frame check sequence field (FC8') 33'r. Frame 40 also has a destination address field (DA).
41. Source address field (SA) 42, control information field (CTL) 43. Information field (IN
F) 44 and Frame Check Sequence Field (Fe2) 45t.

Further, frame 50 has a destination address field (1) A
) 51. Information field (INF'") 52 and frame check sequence field (Fe2") 53
has.

Next KC8MA/C8MA from terminal 26 on CD bus 24
The case where a frame is transferred to the terminal 27 on the /CD bus 25 will be explained as an example. C8Δ from terminal 26 to terminal 27
Transmitted by IA/CD bus protocol 7+/-A3
When the Qi/domain 22 normally receives the contents of the CS' 33, it checks the DA'31' and obtains the destination address A. Next, the node 22 checks in which node the terminal with address A is accommodated and connected to the stA/CD bus using the group number generation mechanism of the present invention. That is, the node 22 inputs the content A of DA'll to the group number generation mechanism shown in FIG. 1 and immediately obtains the address X of the node 23. Node 22 is in frame 4o
address X in DA41, control information in address Y1CTL16 of node 22 in 5A42, and lNF44.
The contents of 1) A'31 and INF'32 of the frame 30 received from the terminal 26 are packed as they are, and further Fe245
Attach the frame check sequence of this frame to
The packet is transmitted to the ring-shaped packet transmission path 21. When node 23 receives frame 40 with normal FC845 content, frame 4° to DA41.5A42, CTL43
and discard F'C845 and transmit frame 3o of terminal 26
Node 2 extracts the information field INB'44, which is filled with DA'31 and INF'32, and adds the frame check sequence for it to Fe2'53.
3 is transmitted to the C 8 MA/CD bus 25 accommodated by the terminal 27 and received by the terminal 27 .

The symbol string n registered in the string search device of the group number generation mechanism of the node 22 registers the addresses of all the terminals connected to the C8MA/CD path accommodated in each node of the ring-shaped packet transmission path 21. Ru. Further, the destination address of the frame received from the CSNA/CD bus is input to the symbol string classifier input line. The group number and the address of the terminal connected to the node are registered in correspondence so that the group number obtained after input means the node address of the node connected to the ring-shaped packet transmission path.

〔Effect of the invention〕

By configuring the present invention as described above, the storage address of a conventional general-purpose memory element or storage device and the symbol string to be registered can be allocated one-to-one, while the corresponding group number is stored in the storage area and input. Compared to the method of reading the group number from the storage area indicated by the symbol string, the waste of the storage area can generally be reduced. In addition, a table consisting of symbol strings and corresponding group numbers is provided in the storage area of a general-purpose memory element or storage device, and when a symbol string in the table is searched according to a search algorithm and matches the input symbol string, Compared to the method of obtaining the corresponding group number from the table, the search and matching time is shorter and real-time processing is possible.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention, and FIG. 2 is a block diagram showing an embodiment of the configuration of a communication network to which the group number generation mechanism shown in FIG. Trii1 is applied. 11...Input line of input symbol string, 12 path)
IJ song touch device, 13... Match signal line, 14... Registered address output line, 15...
・Encoder, 16...-binary code output, 1
7... Memory, 18... Group number output line.

Claims (1)

[Claims] In an apparatus that registers one symbol string, determines whether the input symbol string belongs to any of n groups, and if it belongs, calculates the group number. ,m
The registered symbol strings are compared with the symbol strings input sequentially from the outside in parallel in real time, and if they match, the registered address of the matched symbol string is sent along with a match signal. A device having means for outputting [l/m]+
1 ([l/m] is a positive integer closest to l/m and smaller than l/m) and the matching signal output of the device as input,
An encoder that has an input of [l/m] + 1 and outputs the number of the device that outputs the matching signal, and the output of the encoder is taken as the upper address, and the registered address outputs of the above [l/m] + 1 devices are logically summed. and a memory in which a group number corresponding to the registered address of the symbol string registered in the device is written, and the memory is connected to the memory and uses this as a lower address, and the device has the [l/m]+1 device register the symbol strings without duplication, input the input symbol strings to the above [l/m]+1 devices at the same time, and convert the encoder from the matching signal of the devices whose registered symbol strings match the input symbol strings. generate the address of the memory in which the group number corresponding to the input symbol string is written based on the upper address of the memory obtained from the registered address and the lower address of the memory obtained from the registered address, and extract the group number from the memory. A group number generation mechanism characterized by reading.