JPS6327737B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a communication control device, and more specifically, to a communication control device that accommodates a communication line and controls the transmission and reception of information on the communication line.

A communication system including this type of communication control device is
Conventionally, the configuration was as shown in FIG. That is, a communication control device 1 that accommodates a plurality of communication lines 5 and controls them in a multiplex manner is connected to a data channel device 2 through one path, and
It has been common practice to transfer information to and from the main storage device 4 and the communication control device 1 via the data channel device 2. Reference numeral 3 denotes a central processing unit, which has functions such as controlling the data channel device 2, the main storage device 4, etc., and processing the above-mentioned transmitted and received information.

For example, in packet exchange, as shown in FIG. 2 6, the information consists of a user data section UD and a control information section CD for attribute identification and transfer control of this information, and as shown in FIG. 2 7. As shown, data link closure control, data link closure response, data frame (user data section above)
A response to the transmission/reception information 6) with UD and other control information consisting only of CD are transmitted.

Therefore, in the past, all of this transmitted and received information was transferred between the line and the main storage device via the data channel device 2, and the central processing unit 3 was required to decode the user data part as in the information exchange process. Even if there is no control information section, it is necessary to process the control information section separately from the user data section, and to assemble the processed control information section and user data section on the main storage device 4. Therefore, the load on the data channel equipment and central processing unit has increased.

The present invention eliminates the above-mentioned drawbacks of the conventional art, separates the control information section and the user data section, and connects the control information section and the user data section separately to the central processing unit and the communication control device via different routes. An object of the present invention is to provide a communication control device that can reduce the load on a central processing unit and a data channel device.

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 3 is a connection diagram of an embodiment of the present invention, where 10 is a communication control device implementing the present invention, and 9 is a central processing system including a central processing unit, a main storage device, a data channel device, etc. Show the device.

In the communication control device 10, a plurality of lines 5 are accommodated in a line control section 13 thereof. Note 11
12 is a main control unit, 12 is a storage unit, 14 is a buffer register, and 15 is a direct memory access (DMA) that controls direct access to the main storage device of the central processing system unit 9 via a data channel device.
This is the control section. Note that 16 is a common bus for transferring data between the above-mentioned units in the communication control device 10. The line 5 transmits and receives both information consisting of the control information section CD and user data section UD shown in FIGS. 6 and 7, and information consisting only of the control information section CD.

In the case of reception, the line control unit 13 receives information from one of the lines 5 according to instructions from the main control unit 11, and transfers the received information (data block) to the bus 16.
Then, the control information length included in the control information section is extracted from the received information to separate the control information section and set in the buffer register 14 via the bus 16. The central processing unit of the central processing system unit 9 accesses this buffer register 14 and reads the set control information section.

On the other hand, if the data received from the line has a user data section, the main control section 11 instructs the direct memory access control section 15 to start the transfer after setting the user data storage start address and user data length. Through the control unit 15,
Preparations are made to transfer the user data portion of the received information stored in the storage section 12 to the main storage device of the central processing system device 9. The central processing unit analyzes the control information section read above, determines the normality of the received data, determines whether there is a user data section, and if there is a user data section, direct memory access control section 15 access the
The user data section stored in the storage section 12 is read into the main storage device of the central processing system unit 9.

In the case of transmission, that is, when the central processing unit transmits information to one of the lines 5, the central processing unit sends the control information section edited by the central processing unit to the buffer register 14 of the communication control unit 10. Visit and redirect here. When information received from one line is transferred to another line, the control information part read from the buffer register 14 at the time of reception is analyzed, necessary processing is performed, and the information is set in the buffer register 14 again. The user data section corresponding to the control information stored in the main memory is information necessary for user-specific processing, and does not need to be interpreted by the central processing unit, so it can be directly used for direct memory access control of the communication control device 10. Part 1
5, the data is transferred to the storage unit 12 via the bus 16, and stored therein. This process is unnecessary if the corresponding user data section does not exist. Communication control device 10
In the main control section 11, the buffer register 14
The control information section received in 1 is temporarily transferred and stored in the storage section 12, and the information frame to be combined with the user data section and sent to the line is edited and configured at consecutive addresses in the storage section 12, and then the main control section 11 performs line control. Part 13
By setting the start address and frame length of the information frame and instructing to start the transfer, the information is read from the storage unit 12 and sent to the line control unit 1.
3 and then sends it to the required line.

The present invention is configured as described above, and in a communication system in which transmission and reception information consisting of a control information section and a user data section and transmission and reception information consisting only of a control information section coexist, the present invention enables a central Use a communication control device that can separate and transfer the control information section and user data section to the processing device through separate paths, and that can separate and assemble the control information section and user data section of transmitted and received information. Since each part can be managed separately on the main memory of the central processing system, there is no need to transfer the user data section within the main memory. Therefore, it is possible to reduce the processing load on the central processing system, particularly on the central processing unit and the data channel device.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an outline of a communication system using a conventional communication control device, FIG. 2 is a diagram showing the structure of transmitted and received information used in the present invention, and FIG. 3 is a block diagram of an embodiment of the present invention. It is a diagram. 1... Conventional communication control device, 2... Data channel device, 3... Central processing unit, 4... Main storage device, 5... Communication line, 6... Consisting of control information section and user data section. Transmission/reception information, 7...
Transmission/reception information consisting only of the control information section, CD...
...Control information department, UD...User data department, 9...
...Central processing system unit, 10...Communication control device, 11
...Main control unit, 12...Storage unit, 13...Line control unit, 14...Buffer register, 15...Direct memory access control unit, 16...Bus.

Claims (1)

[Claims] 1 A line control unit that accommodates a plurality of lines that transmit and receive information consisting of a control information section and a user data section, and information consisting only of the control information section, and that controls these lines, and summarizes the transmission and reception information of the above lines. a buffer register that can transfer only the control information section of the transmission/reception information to and from the storage section and that can be accessed from the central processing unit; and a buffer register that directly accesses the main storage and stores the The control information section includes a direct memory access control section that controls the transfer of the user data section of the transmission/reception information between the storage section and the main storage device, and a main control section that controls each of the sections. Communication control characterized in that the user data section is transferred to a central processing system comprising the central processing unit and the main storage device via the buffer register and the direct memory access control section. Device.