JPS599742A - Classifying method - Google Patents

Abstract

PURPOSE:To shorten the time required for classification, by inputting the classifying information added to real information to an address of a memory, and executing the classification by its output, in a method for classifying whether the real information on a system bus is necessary to the own station or not. CONSTITUTION:In each of plural stations coupled by a system bus, all information frames on the bus are inputted, and this classifying information is inputted to an address of the first and the second classifying memories 1, 2, respectively. When this real information is necessary information to its own station, the first and the second processing informations of each real information are outputted from the memories 1, 2, a necessary deciding signal is outputted by a discriminating circuit 3, and the first and the second processing informations are added to the real information and are transferred to a terminal of its own station. On the other hand, in case of unnecessary information, specified information is outputted from the memory, an unnecessity deciding signal is outputted from the discriminating circuit 3, and receiving information is eliminated. Accordingly, whether the real information is necessary or not can be classified quickly.

Description

[Detailed Description of the Invention] The present invention relates to a screening method for selecting whether real information flowing on a system bus is necessary for the own station, and the screening information added to the real information is input to an address in a memory. , the purpose is to quickly select based on the output of the memory.

Generally, in an information transmission system in which multiple stations are connected via a system bus and information is received and passed between arbitrary stations, each station that wants to transmit information has to specify the type of actual information that it wants to transmit. .

For example, the receiving station adds selection information indicating the receiving device and the type of information to form an information frame as shown in Figure 1, and sends the information frame to the system bus, while each other station sends the information frame to the system bus. It captures all information frames flowing on the system bus, and uses screening information added to the actual information to determine whether or not the actual information is necessary for its own station.

By the way, according to the conventional sorting method of this kind, each station has a sorting memory in which sorting information of actual information required by the station is written and a processing memory in which processing information corresponding to the sorting information is written. It scans the memory addresses of the sorting memory to sequentially detect matches between the written sorting information and the received sorting information, and by detecting the coincidence, the currently received information is set as necessary information. Further, when the match is detected, processing information of the actual information is selected from the processing memory based on the selection information.

However, according to the conventional sorting method described above, since there is a large amount of received information and there are hundreds of types of information and several steps, it takes a considerable amount of time to detect matches in the sorted information by scanning and select processing information, making it difficult to sort quickly. There are drawbacks to not being able to do it.

This invention was made with the above points in mind,
A plurality of stations connected by a system bus each take in all the information flowing on the system bus, and whether or not the actual information of each information is necessary for the own station is added to the actual information to indicate its type. In the sorting method of sorting based on sorting information, each station is provided with a memory for sorting, and matching information is written in each address of the memory that is equal to the sorting information of the actual information required by the own station, and each station is specified at an address other than the above. The sorting method is characterized in that information is written, sorting information of the imported information is input to the address of the memory, and only when the output of the memory is other than the specific information, the actual information is set as necessary information. .

Therefore, by inputting the sorting information of the captured information into the memory address and looking at the output of the memory, it is possible to quickly sort the captured actual information. By writing the processing information for the actual information to the same address as the actual information selection information, it is possible to not only quickly select the imported actual information, but also to confirm that the actual information is necessary for the own station. In this case, the processing information of the real information can be obtained at the same time, and by adding this processing information to the real information and transmitting it to the terminal of the own station, the processing of the terminal can be reduced.

Next, this invention will be explained in detail with reference to FIG. 2 showing one embodiment thereof.

In Fig. 2, (D t (2) is the memory for first and second sorting consisting of ROM (read only memory), and the sorting information added to the actual information among the information taken into the own station is used for both sorting. The first sorting memory (1) contains the first sorting memory (1) for the real information needed at the address corresponding to the sorting information of the real information needed by the own station. 1 processing information is written, and specific information (
For example, FFH) is written, and further, in the second sorting memory (2), second processing information for the real information is written at the address equal to the sorting information of the real information required by the own station, and the second processing information other than the above is written. Specific information (for example, FFH) is written in each address.

(3) is a judgment circuit that receives the outputs of the first sorting memory (1) and the second sorting memory (2) and judges whether or not the actual information currently taken in by Ryokawa is necessary for the own station. When the outputs of both sorting memories (1) and (2) are both specific information, an unnecessary determination signal is output, and in other cases, a necessity determination signal is output.

Next, the operation of the above embodiment will be explained.

First, each of a plurality of stations connected by a system bus takes in all the information frames flowing on the system bus, and each time this information frame is received, the sorting information of the information frame is stored in the first and second sorting memories ( 1) e
Enter each address in (2). When the actual information of the received information frame is information necessary for the own station, the first processing information and the second processing information of the actual information are stored in the first screening memory (1) and the second screening memory (2), respectively. Since the information is output, a necessity determination signal is output from the determination circuit (3), and it is determined that the currently captured information is necessary information for the own station, and the first . It adds second processing information and transfers it to its own terminal.

In addition, if the actual information in the received information frame is unnecessary information for the own station, specific information is output from both screening memories (1) and (2), so the judgment circuit (3) determines that it is unnecessary. A signal is output, and the station determines that the information currently being captured is unnecessary information for its own station, and discards the received information.

Therefore, according to the embodiment, the selection information of the information imported into the local station is stored in the first . Second sorting memory (1)? (
By simply inputting each address in 2), it is possible to quickly determine whether or not the actual information is necessary for the own station, and there is no need for a considerable amount of time for scanning as in the conventional case. When the received actual information is necessary for the own station, the first and second processing information for the actual information can be obtained from both sorting memories (1) and (2), respectively, so this is added to the actual information. By transferring the information to the terminal, processing at the terminal becomes easier and the processing can be reduced.

In the above embodiment, two pieces of processing information are added to one piece of real information necessary for the local station, but when adding only one piece of processing information, only one sorting memory is required. good.

In addition, the first . When two pieces of second sorting information are added, both pieces of sorting information are added to the first and second sorting information, respectively. Second sorting memory (1), (
You can manually enter the address in 2).

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of an information frame in a general information transmission system, and FIG. 2 is a schematic block diagram of one embodiment of the selection method of the present invention. (1)? (2)... 1st. Memory for second sorting. Agent: Patent Attorney Ryutabe Fujita

Claims (1)

[Claims] ■ A plurality of stations connected by a system bus each take in all the information flowing on the system bus, and determine whether or not the actual information of each piece of information is necessary for the own station. In the sorting method of sorting based on sorting information added to the station and indicating its type, each station is provided with a memory for sorting,
Write matching information to each address in the memory that is equal to the selection information of the actual information required by the local station, write specific information to each address other than the above, and write the selection information of the imported information to the address of the memory. input, and only when the output of the memory is other than the specific information,
A selection method characterized by using the actual information as necessary information. (2) The selection method according to claim 1, characterized in that processing information for the actual information required for the local station is written in each address equal to the selection information for the actual information necessary for the local station.