JPS6260044A - Communication controller - Google Patents

Abstract

PURPOSE:To improve processing efficiency and a transmission speed by controlling control information for packet transmission and reception and the information part of a packet individually. CONSTITUTION:The information part of a transmit packet generated by a CPU 1 is stored in a shared memory 11 and information on correspondence relation with the packet and control information on the transmission of the packet are stored in a shared memory 9. The CPU 2 performs processing accord ing to command codes set in the memory 9 and sets the result in a shared memory 10, and requests a CPU 3 to perform processing while maintaining the correspondence relation with the information of the transmit packet stored in the memory 11. The CPU 3 passes the information part of the transmit packet stored in the memory 11 through a communication control part 21 accord ing to the control information stored in the memory 9 on a DMA control basis to send out the packet directly to a circuit without the intervention of a pro gram.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a communication control device that performs e-foot format data transmission to improve processing efficiency and increase transmission speed. .

[Conventional technology]

An example of the configuration of a conventional communication control device of this type is shown in Figure 3 and Figure 3.
Each is shown in Figure 1. Here, an example is given in which shared memory is used as a means of communication between Conview and Yuyami. No.;
According to FIG. 3, the information part of the foot and the transmission/reception control information of the packet are managed as one by one shared memory 35.

Further, according to FIG. 4, the microcomputer in the communication control device is divided into functions, the CPU 42 controls protocols such as packet transmission control procedures, and the CPU 431/i
': This is a method in which the communication control circuit 51 is controlled to execute the transmission and reception of the foot.

With such a configuration, data transmission in the ・Pri, ・T format was performed.

[Problem that the invention seeks to solve]

However, although the configuration shown in FIG. 3 has a simple circuit configuration, there are limits to processing efficiency and transmission speed. Furthermore, although the system shown in Figure 41 has been improved in terms of processing efficiency and transmission speed as a communication control device by the amount of functional division, the longer the information section of the foot, the more The /J ticket reception between the CPUs is passed, that is, the /F ticket shared memory 47 and shared memory 48 are transferred between the CPUs.
and require a long time to transfer. For example, it takes about 10 milliseconds to transfer 1000 bytes with an 8-bit microcomputer, and the computer takes up 100 waiting hours for this transfer.
This was a bottleneck in terms of processing efficiency.

The present invention is intended to solve such conventional problems, and aims to provide an excellent communication control device that improves processing efficiency and transmission speed.

[Means for solving problems]

In order to achieve the above object, the present invention includes a first computer as a host computer, a second computer that executes a protocol such as a transmission control means, etc.
a third computer for transmitting a combiator, and a fourth computer for receiving a combiator between the first computer and the second computer; between the first computer and the third
A communication means including a shared memory is provided between the second computer and the fourth computer, and between the first computer and the fourth computer, respectively.

[For production]

According to the above configuration, the information part of the transmission packet is stored in the shared memory provided in the communication means between the host computer and the sending computer, and the information part of the transmitted packet is stored in the shared memory provided in the communication means between the host computer and the receiving computer. In addition to storing the information part of the reception and packets in the memory, the control information of each backcut and information indicating the correspondence with the packet can be stored in the shared memory of other communication means, so that it can be transmitted between computers. The transfer time of the information part of the packet can be reduced.

〔Example〕

Hereinafter, embodiments will be described in detail with reference to the drawings. Figure 1 shows
This shows one embodiment of the present invention, in which a communication means including a microcomputer and a shared memory is added to the conventional example shown in FIG.

Based on this figure, a control method during transmission will be explained.

(1) Store the 7 pieces of information generated by the host computer in the shared memory, and
Information indicating the correspondence with the foot and control information related to the transmission of the packet are stored in the shared memory 9.

(2) The usage of the shared memories 9 and 11 at this time is illustrated in FIG. The command code in the shared memory 9 is used to set instructions given by the host computer to the communication control device, such as initialization of the communication control device, blockage thereof, and backup transmission. The transmission backt address is the address of the information section of the transmission/print command stored in the shared memory 11.The transmission result data is set to the result of sending the backt; This is not intended to send reverse notification to the host heater.

HDLC7 dress field and control field, HDLC (high level data link controller J)
An example of sending a message in the @) format is C.
Set by PU2. The transmission data length of the shared memory 1 indicates the length of the information section of the transmission grid. Work areas 1 and 2 contain the HDCL header to be added to the information section of the transmission/Pkerato, that is, the address field and control field P set in the shared memory 9.
This area is set when transmitting a packet, and is used to form an HDLC information frame in a continuous memory space.

(3) The CPU 2 performs processing according to the command code set in the shared memory 9, and transfers the result to the shared memory 1.
0, and the CPU is
Request processing to 3. The configuration of the shared memory 10 may be basically the same as that of the shared memory 9.

(4) The CPU 3 uses direct memory access (DMA) to access the information part of the transmission packet stored in the shared memory 11 according to the control information stored in the shared memory 10.
Depending on the control method, the kerato is directly sent to the line via the communication control circuit 21 without any program involvement.

As is clear from the above, the advantage of the transmission/grid information section is that once it is set in the shared memory 11 by the host computer, there is no need to programmatically transfer it between memories within the communication control device. has.

For this reason, CPU2 and CPU3 are used for the original control.
00% usage is possible, and processing efficiency can be improved.

When receiving a packet, the procedure is reversed to that when transmitting the packet. That is, the received foot is stored in the shared memo 'J13 using the DMA control method, and
The control information and information indicating the correspondence with the backcut are stored in the shared memory 12 and the shared memory 9,
PU2 notifies the reception of the post combination -'XK-9 packet. This allows the post computer to immediately retrieve the received packet from the shared memory 13.

In this way, even during reception, there is an advantage that there is no need to transfer the information portions of 1 and 1 within the communication control device between program control units.

〔Effect of the invention〕

As is clear from the above embodiments, the present invention eliminates the need for transmission or reception between microcomputers through program control within the communication control device, thereby reducing the load on the microcomputers and processing. This makes it possible to improve efficiency and also to improve transmission speed.

[Brief explanation of the drawing]

FIG. 1 is a schematic block diagram of an embodiment of the present invention, FIG. 2 is a diagram explaining how to use shared memory, FIGS.
Each figure is a schematic block diagram of a conventional example. 1.2,3.4・CPU, 5,6,7,8-ROM
/RAM, 9,10,11.12゜13...Shared memory, 14,15,16,17,18...Conflict control circuit, 19.20...DMA control circuit, 21.22...
・Communication control circuit, 23°24.25.26...pass. Patent applicant: Matsushita Electric Industrial Co., Ltd.

Claims (1)

[Scope of Claim] A communication control device connected to a host computer to perform packet transmission, comprising: a first computer serving as a host computer; a second computer executing a protocol such as a transmission control procedure; a third computer that controls a communication control circuit to transmit packets; a fourth computer that controls a second communication control circuit to receive packets; communication means A between the second computer and the third computer; communication means B between the second computer and the third computer; communication means C between the first computer and the third computer; a communication means D between the computer and the fourth computer,
A communication means E is provided between the first computer and the fourth computer, and the information part of the packet to be transmitted is transmitted by the communication means C,
Information indicating the correspondence with the transmission packet and control information related to the transmission of the transmission packet are transmitted by the communication means A and communication means B, while the information part of the received packet is transmitted by the communication means E, and the information part of the received packet is transmitted by the communication means E. By transmitting information indicating the correspondence with the packet and control information related to the reception of the received packet through communication means D and communication means A, the control information for transmitting and receiving the packet and the information part of the packet are managed separately. A communication control device characterized by: