JPS63104543A - Received data processing system - Google Patents

Abstract

PURPOSE:Not to unnecessarily occupy a buffer from the time of receiving a frame till the time of completing the process by registering only two pieces of information of an address information part and a control information part in a received frame information process waiting line when the received frame has only the address information part and the control information part and adding respective identifiers to the address information to be registered in the said line in other cases. CONSTITUTION:In a titled system, there are a received frame length acquirement means 1 for acquiring the frame length of the received frame, a received frame information decision means 2, a received frame information register means 3 for registering two kinds of information themselves in the received frame information process waiting line when the information decision means 2 decides that the received frame has only the address information part and the control information part and adding the identifiers to addresses in an area where the received frame is stored in other cases so as to be registered in the received frame information process waiting line and a received frame analysis means 4 for acquiring one of the registered received frame information from the received frame information process waiting line and deciding to analyze the kind of registered information from the identifiers. Thus the buffer can be prevented from being unnecessarily occupied until the received frame is complated to be processed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a received data processing method in data link control.

[Conventional technology]

Conventionally, the received data processing method for data link control uses the same implementation method regardless of the scale of the communication processing device in which the data link control is implemented, and after receiving the frame, the frame is actually analyzed and processing ends. until
The area where the received frame is stored is occupied regardless of the length of the received frame, and data processing is performed using only the address information.

[Problem that the invention seeks to solve]

In the conventional received data processing method for data link control described above, when implemented in a small-scale communication processing device that has little usable memory and cannot secure sufficient buffer space, it is difficult to process monitoring frames with short frame lengths or non-numbered frames. Even when a frame is received, a buffer area that is too large compared to the length of the received frame will be occupied until the processing of the received frame is completed, reducing the buffer area usage efficiency within the communication processing device, and This method has the disadvantage of causing a decrease in overall processing efficiency.

Further, even when a large-scale communication processing device is installed, an unnecessary buffer area is inevitably occupied for a certain period of time, which is not preferable.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for processing received data in data link control, which eliminates the above-mentioned drawbacks.

[Means for solving problems]

The received data processing method of the present invention controls data transmission and reception using an information transfer dedicated frame having a transmission sequence number and a reception confirmation number, a monitoring frame having a reception confirmation number, and a non-numbered frame for connection/disconnection control. In a received data processing method in data link control, a received frame length acquisition means acquires the frame length of a frame received from a partner station, and a received frame is controlled as an address information part based on the frame length acquired by the received frame length acquisition means. received frame information determining means for determining whether or not the received frame has only an information section; and when the received frame information determining means determines that the received frame has only an address information section and a control information section, the two types of information themselves include; a received frame information registration means that adds respective identifiers to the addresses of the areas where the received frames are stored and registers the received frame information processing in a queue when it is determined that the received frames have other information parts; Received frame analysis means that acquires one received frame information registered by the received frame information registration means from the received frame information processing queue, determines the registered information type from the identifier, and analyzes the received frame. .

〔Example〕

Next, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention, FIG. 2 is a flowchart explaining the detailed operation of the received frame length acquisition means 1, and FIG. 3 is the detailed operation of the received frame information judgment means 2. 4 is a flowchart explaining the detailed operation of the received frame information registration means 3, FIG. 5 is a flowchart explaining the detailed operation of the received frame analysis means 4, and FIG. 6 is a flowchart explaining the detailed operation of the received frame information registration means 4. FIG. 7 is a +14 diagram showing the format of received frame information, and FIG. 8 is a configuration diagram showing the format of DCW (data control word).

Referring to FIG. 1, one embodiment of the present invention includes a reception frame length acquisition means 1 for acquiring the frame length of a frame received from a partner station, and a reception frame length obtained from the reception frame length acquisition means 1. Received frame information determining means 2 determines whether the received frame has only two bytes of information and control information or other information, and the received frame determines whether the received frame has address information and control information based on the determination information from the received frame information determining means 2. If there are only 2 bytes, the information is registered/obtained in the 2 bytes of information, and if other information is included, the address information indicating the area where the received frame is stored is registered/obtained together with the identifier that identifies each. The common management means 5 registers the received frame information in the received frame information processing queue, and the common management means 5 stores the received frame information registered by the received frame information registration means 3 in the received frame information processing queue. The received frame analysis means 4 acquires one from the matrix, determines received frame information from the identifier, and analyzes the received frame.

Next, the operation of the present invention will be explained with reference to FIGS. 1 to 8.

First, referring to FIG. 8, the format 81 is a reception frame storage area start address 81A prepared for receiving frames from a partner station, and an instruction word 81 indicating whether or not data is to be continued.
This represents the format of DCW (data control word), which is information that notifies F/W (firmware) of the maximum number of receivable characters (tally) 81C indicating B and data size (referred to as tally). In the maximum receivable character number (tally) 81C area in the DCW, the remaining tally number is written by F/W (firmware) upon completion of frame reception.

Referring to steps 21 to 22 in FIG. 2 and format 81 in FIG.
The CW is searched and the remaining tally is obtained from the DCW at the time of completion of frame reception (step 21). The number of characters in the received frame is calculated from the obtained remaining tally and the prepared maximum receivable tally (step 22).

Referring to steps 31 to 33 in FIG. 3, the received frame information determining means 2 determines that if the received frame length is 2 bytes, it is frame type 1 (step 32), and if it is 3 bytes or more, it is determined to be frame type 2. (Step 33)
.

Referring to steps 41 to 45 in FIG. 71, the received frame information registration means 3 determines the received frame type, and if the frame type is 1, the address information section 71C and the control information section 71D are extracted from the area where the received frame is stored. Obtain (step 42).

Thereafter, the received frame storage area is returned to the buffer area (step 43). The acquired two pieces of information (that is, the address information section 71C and the control information section 71D) are received by the information registration/acquisition common management means 5 in the format 71 shown in FIG. It is registered in the frame information processing queue (step 44).

If the received frame type is frame type 2, the storage area address information of the received frame is stored in the received frame information processing queue by the information registration/acquisition common management means 5 in the format 72 of FIG. Register (step 45).

Referring to steps 51 to 54 in FIG. 5, the received frame analysis means 4 acquires one piece of received frame information from the received frame information processing queue by the information registration/acquisition common management means 5 (step 51). The information identifier in the acquired information is identified (step 52), and if "direct information is present", the frame type is determined from the control information section 71D in the acquired information of format 71, and processing for each type is started (step 53).
). If the information identifier is "Indirect information included", format 72 is used.
Storage area address information 7 of the received frame in the acquisition information of
Obtain the received frame control part in the storage area based on 2C,
From there, the frame type is determined and processing for each type is started (step 54).

Referring to steps 61 to 64 in FIG. 6, information registration/
The acquisition common management means 5 determines the type of request.
1) If it is an acquisition request, the head of the received frame information queue is searched and one entry is obtained (stave 62), and the acquired entry is then returned to the free entry chain (step 63). If it is a registration request, one free frame is acquired, only designation information is set, and then it is registered in the reception frame information queue (step 64).

Also, referring to FIG. 7, received frame information format 7
1 is received frame information when the received frame consists of only 2 bytes of address information section 71C and control information section 71D, and format 72 is received frame information when the received frame exceeds the above 2 bytes and includes storage area address information 72C. Both of them include unused areas 71B and 72B.

〔Effect of the invention〕

In the present invention, when a received frame has only an address information field and a control information field, the received frame storage area is released into a buffer area after extracting the three parts from the received frame storage area, and the received frame information processing is performed. If the queue contains only the information of the three parties, and if other information is also included, add each identifier to the address indicating the received frame storage area + ri information and register it in the received frame information processing queue. , it is possible to prevent the buffer from being unnecessarily occupied between the time a frame is received and the time when the received frame is actually processed, thereby increasing the buffer area usage efficiency and preventing a decrease in the processing efficiency of the communication processing device. There is an effect.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention, FIG. 2 is a flowchart explaining the detailed operation of the received frame length acquisition means 1, and FIG. 3 is the detailed operation of the received frame information judgment means 2. 4 is a flowchart explaining the detailed operation of the received frame information registration means 3, FIG. 5 is a flowchart explaining the detailed operation of the received frame analysis means 4, and FIG. 6 is a flowchart explaining the detailed operation of the received frame information registration means 4. 7 is a block diagram showing the format of received frame information, and FIG. 8 is a block diagram showing the format of DCW (data control word). 1... Received frame length acquisition means, 2... Received frame information judgment means, 3... Received frame information registration means,
4... Received frame analysis means, 5... Information registration/acquisition common management means. Kaya /l! t I Z Regeneration 3 Concave 2 Zaike 3 Figure No. 4

Claims (1)

[Claims] Data link control that controls data transmission and reception using an information transfer dedicated frame having a transmission sequence number and a reception confirmation number, a monitoring frame having a reception confirmation number, and a non-numbered frame for connection/disconnection control. The received data processing method includes: a received frame length acquisition means for acquiring the frame length of a frame received from a partner station; and a received frame is divided into only an address information part and a control information part from the frame length acquired by the received frame length acquisition means. received frame information determining means for determining whether the received frame information has only an address information section and a control information section; a received frame information registration means for registering received frame information processing in a queue by adding respective identifiers to the addresses of areas where the received frames are stored when it is determined that the received frames also have an information section; It is characterized by comprising a received frame analysis means for acquiring one piece of received frame information registered by the registration means from a received frame information processing queue, determining the type of registered information from the identifier, and analyzing the received frame. Received data processing method.