JPS6192063A - Response information transfer controller - Google Patents

Abstract

PURPOSE:To improve the use efficiency of a transmission line by providing a data transmission source node address, a reception table, and a transmission address table to transfer response information collectively to destinations in the reception table. CONSTITUTION:In case of data transfer from an optional node (n) to a node 2, a function code detecting circuit 12 detects and discriminates a function code FC in a data frame format to detect that transfer data is directed to the node 2 itself, and transfer data is taken into a reception data buffer 14, and the code is recorded in a transfer data reception table 17 of the node itself. When a token signal is transmitted to the node 2 from above the node 2 in the ring, the token signal is detected by a token signal detecting circuit 11; and if the code indicating the reception state exists in the transfer data reception table 17, the code of the reception table is transferred collectively as response information through a multiplexer 13 before transfer data in a transmission data buffer 15.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a data transfer method in a token ring or a token bus. The present invention relates to a transfer control device suitable for reducing the load on a transmission line by transferring data.

[Background of the invention]

In the conventional loop transmission control system, the
As shown in Publication No. 6, the node that detects the token signal acquires the transmission right and sends information to the other node,
Furthermore, check the response information from the other node, and then
Send the token signal to the next node. A control method was used to release the transmission rights to the station and transmission lines. However, with this control method, the order of data transfer, followed by response frame transfer, is always repeated on the transmission path, and from the perspective of the source node, it waits for response information and then sends a token signal. There is no necessity to release the token signal to the next node, and the token signal may be released immediately. In other words, there are many transmission control methods in which the temporal usage efficiency of the entire transmission path is reduced.

In addition, in order to solve this type of problem, we have developed
As shown in Publication No. 8030, after a node that has acquired a token signal sends information to the other node, it releases the token signal to the next node without waiting for a response from the other node, and the other node acquires the token signal. There is also a transmission control method that sends response information to the destination source node when the request occurs.

However, in this method, the number of destination nodes when a node that acquires a token signal sends response information is limited.
- Nothing is specified, and response information is sent only to the node that received it first. That is, in order to further increase the temporal usage efficiency of the transmission path, the best control method is for the node that has acquired the token signal to transfer all of the response information that is in its own node at that time.

[Purpose of the invention]

An object of the present invention is to provide a response information transfer control device that improves the efficiency of using a transmission path. - [Summary of the Invention] The main point of the present invention is that each node has a transfer data reception table that stores the data transmission source node address and the reception status of the data transmission source to the node, and Having a forwarding data sending ato'v stable that stores the destination node address, when the own node captures a token signal, transmits response information all at once to the other node in the forwarding data receiving table within the own node. It is in.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIG.

FIG. 1 shows an embodiment in which the present invention is applied to a token ring. Each node includes a token signal detection circuit 11.
It is composed of a function code detection circuit 12, a multi-7'' V fuser 13, a reception data buffer 14, a transmission data buffer 15, a transfer data transmission address table 16, and a transfer data reception table 17.

For example, consider a case in which data is transferred from an arbitrary node n to node 2 in the data frame format shown in FIG. 3 in FIG. The function code detection circuit 12 of the node 2 determines the function code FCt-detection 1 in the data file V-mux format, detects that the data is to be transferred to its own node, and takes the transferred data into the reception data buffer 14. At the same time, a code indicating that the data transferred from node 1 to node 2 was successfully received by node 2 is recorded in the transfer data reception table of the own node. This is shown in FIG. 2(b). This is represented by storing 1, for example, code 1, in the receiving node data field at address n.

Next, when the node 2 receives a token signal from the upstream side of the ring, the token signal detection circuit 11 detects the token signal, and at the same time, the node 2 receives the token signal in the transfer data reception table 17, that is, the table shown in FIG. 2(b). It is determined whether or not there is a code that stores the status, and if there is a code that indicates some kind of reception status, or if there are more than a certain number of reception codes, the node that captured the token signal transfers the data to the transmission data buffer. Prior to the transfer data at 15, the response information is transferred all at once through the multiplexer 13 in the frame format shown in FIG.

In FIG. 4, ESP O is the response information R from node 2 to node O.
ESP 1 indicates response information from node 2 to node 1, and the code in the transfer data reception table of the node is transferred as data as is.

That is, by transmitting the code indicating the reception status in the transfer data reception table 17 according to the data frame format shown in FIG. 4, the reception status of data received by any node can be transmitted to other nodes. You can respond in one transfer all at once.

On the other hand, consider a case where node 2 transfers data to node n, and then response information is transferred from node n to node 2.

Node 2 captures the token signal and transfers the token signal according to the frame format shown in FIG. In the data transmission address table 16, that is, the table shown in FIG.
A code indicating that "transferred from node n to node n," for example,
Remember 11#.

Next, node n captures the token signal in the same manner as described above, and transfers the response information, ie, the contents of the table shown in FIG. 2(b), all at once according to the frame format shown in FIG. At this time, since the function code FC in the frame format of FIG. 4 is 6 response information, all nodes are sure to receive this response information.

Considering when node 2 receives this response information, the fourth
8A and RESP2 of the frame format shown in the figure.
Based on the contents of , it can be recognized whether the data transferred to the above-mentioned node n stored in the transfer data transmission address table of the own node (node 2) in FIG. 2(a) has been successfully received by the node n. .

〔Effect of the invention〕

According to the present invention, the node that has captured the token signal can transfer the reception status indicated by the contents of the transfer data reception table, that is, the response information, all at once, thereby improving the substantial data transfer efficiency of the transmission path.

[Brief explanation of drawings]

FIG. 1 is a system diagram of an embodiment of the present invention, FIG. 2 is a diagram showing an embodiment of a transfer data sending address table and a transfer data reception table according to the present invention, and FIGS. FIG. 2 is a diagram showing an example of a frame format of transfer data. 1-3. n... Node, 11... Token detection circuit, 12... Function code detection circuit, 13... Multiplexer, 14... Reception data buffer, 15... Transmission data output 2 and a node RB > Many continuations from page 51 Akira Ko Issu Shin Hitachi University, Mikamachi 5-chome or 2-1 Factory Hitachi, Ltd. Omi 2-1 Hitachi, Ltd. Omiichi 41-

Claims (1)

[Scope of Claims] 1. A token ring in which a token signal giving the right to transmit on a transmission path is circulated to each node on the transmission path, or
On the token bus, each node has a transfer data transmission address table that stores the data destination node address, a transfer data transmission address table that stores the data source node address, and the transfer data reception status from the source node. and a data reception table, the node that recognizes the token signal, if the transfer data reception status of the transfer data reception table in the own node indicates that data is being transmitted from the node to the own node, the node recognizes the token signal. Prior to data transfer from a node to another node, the transmission data reception status from the transmission source node, so-called response information, is sent to the transmission source node address of all data stored in the transmission data reception table. A response information transfer control device characterized in that the response information transfer control device transfers the information all at once. 2. In claim 1, the node that has recognized the token signal receives the transfer data from any number of nodes whose transfer data reception status in the transfer data reception table within the own node can be preset. does not transfer response information until it indicates that the node is present, and when the transferred data reception state exceeds an arbitrary number of nodes, prior to data transfer from the own node to the other node,
The transfer data reception status from the source node, so-called response information, is transferred all at once to the source node address of all data stored in the transfer data reception table. Response information transfer control device.