JPH0683288B2 - Communication control device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication control device, and more particularly to a micro program control system.

2. Description of the Related Art Conventionally, in the case of executing a command from a higher-level device, this type of communication control device has a command execution program existing for each logical channel, which is a unit to which the command is issued, and execution control of the command execution program. It is composed of an execution control program that has an interface function with the host device, and the command execution program handles the control information of the logical channel and the control information belonging to the physical channel in an integrated manner to distinguish between the logical channel and the control information of the physical channel. The control is performed by treating it as a part of the information of the logical channel even if the information belongs to the physical channel, not explicitly.

Problems to be Solved by the Invention However, the conventional communication control device receives a command with a higher-level device, responds to the command, and the like, does not directly access the communication line, logical channel control, and data transmission / reception with the communication line. The command execution program will perform all the physical channel control that directly accesses the communication line of, for example, in the half-duplex line, the command is issued
Since transmission and reception are performed on only one of the two preset logical channels, there is a drawback that the program becomes complicated especially in the control of the physical channel.

The present invention has been made in view of the above-mentioned conventional circumstances,
Therefore, it is an object of the present invention to provide a new communication control device capable of solving the above-mentioned drawbacks inherent in the conventional technology.

Means for Solving the Problems In order to achieve the above object, a communication control device according to the present invention includes a transmission channel connected to a communication line for transmitting data between the communication line and the communication line. A unit which has a plurality of physical channel sections each of which is formed by a pair of two physical channels of a receiving channel for receiving data between them and which is connected to a host device and transfers commands and data with the host device. In a communication control apparatus of a microprogram control system having a plurality of logical channels as a pair, and a plurality of logical channel units corresponding to the pair of physical channels, a logical channel for storing information belonging to the logical channel. A control table is provided for each of the existing logical channels, and the information that belongs to the physical channels is the same. A physical channel control table for each physical channel that exists in the same manner, and further indicates the physical channel control table of the physical channel for which the command is executed in the logical channel control table of the logical channel for which the command is issued. A link pointer of 1 and a second link pointer pointing to the logical channel control table of the logical channel for which the command was issued in the physical channel control cable of the physical channel on which the command is executed; As a micro program for controlling the communication control device, only one execution control program, a plurality of logical channel control programs that exist for each of the logical channels, and a plurality of programs that exist for each command from the host device and control the physical channels No It has three types of physical channel control programs, and the execution control program has a function of controlling commands and data transfer with the host device and a function of managing tasks of the plurality of logical channel control programs. The logical channel control program exists for each logical channel, is activated by the execution control program, decodes a command from the host device, and controls the physical channel control program to execute the command according to the decoding result. The physical channel control program has a function of giving information, a function of controlling execution of the physical channel control program, and a function of changing the first and second link pointers at an arbitrary point of time. Exists in each logical channel And having a function by controlling the physical channel based on the control information independent running function of instructing the instruction performs control of the communication line.

Embodiment Next, the present invention will be described in detail with reference to the drawings for a preferred embodiment thereof.

FIG. 1 is a block diagram of an embodiment of the present invention.

Referring to FIG. 1, the logical channels 11 and 12 are interfaces with a higher-level device, and the control unit 15 has a function of controlling this device, and internally has a processor circuit, a control program, and various control tables. Including.

The transmission channel 13 and the reception channel 14 are interfaces with a physical channel communication line.

The command issued from the host device is logical channel 11 or
It is sent to the control unit 15 through 12, the command is analyzed and executed by the control program in the control unit 15, the transmission channel
Data transfer is performed between 13 or the reception channel 14 and the logical channel 11 or 12. Although data is not shown here, if it is transmission data, it flows from the host device to the transmission channel 13, and if it is reception data, it flows from the reception channel 14 to the host device.

Here, if it is a full-duplex line, the logical channel for which a command is issued is 11 or 12, and regarding data transfer,
In the case of transmission, it is the logical channel 11, and in the case of reception, it is the logical channel 12.

If it is a half-duplex line, both command and data transfer shall be performed on the logical channel 11.

FIG. 2 is a diagram showing an execution state of the control program of the present invention.

Referring to FIG. 2, 21 is an execution control program,
In addition to transferring commands and data with the host device,
It controls the execution of the logical channel control program 22 under it.

The logical channel control program 22 decodes the command and determines the physical channel on which the command is executed. In addition, the physical channel control program 23
The control information is given to and the execution control is performed.

The physical channel control program 23 transfers data to and from a communication line by controlling the physical channel.

FIG. 3 is a diagram showing the relationship between the logical channel control table and the physical channel control table in the normal state.

In FIG. 3, a table 31 is a logical channel control table for storing information belonging to the logical channel 11, and a table 32 is also a logical channel control table.
Stores information that belongs to.

Tables 33 and 34 are physical channel control tables, and are tables that store information belonging to each of the transmission channel 13 and the reception channel 14, which are physical channels.

The link pointer 35 indicates the table 33, and the link pointer
36 is the table 34, and link pointer 37 is the table 31.
, And the link pointer 38 points to the table 32.

FIG. 4 is a diagram showing the relationship of the physical channel control table of the logical channel control table when the command for controlling the reception channel 14 is executed among the cases of controlling the half-duplex line.

Referring to FIG. 4, the tables 41, 42 and 43 are of the same kind as the tables 31, 32, 33 and 34 of FIG. 3, except that the link pointer 45 is the table 44 and the link pointer 46 is the table.
43, the link pointer 47 indicates the table 42, and the link pointer 48 indicates the table 41.

Next, the operation of the present invention will be described with reference to FIG.

The execution control program 21 analyzes the command-issuing logical channel and activates the logical channel control program 22 belonging to the logical channel.

The logical channel control program 22 analyzes the command,
The physical channel control program 23 corresponding to the issued logical channel and the instruction analysis result is activated in response to the instruction. The physical channel control program 23 executes a command by controlling the physical channel, and returns to the logical channel control program 22 that has activated itself. The logical channel control program 22 similarly returns to the execution control program 21.

The execution control program 21 returns a response to the host device. Here, it is assumed that the physical channel to be executed in response to the command is determined in advance as a transmission channel or a reception channel.

In the conventional device, the logical channel control program 22 and the physical channel control program 23 of the above example are combined to form the command execution program.Therefore, the physical channel can be specified for the command execution program. It is obvious that the information required for control is both the logical channel and the physical channel.

In the present invention, as apparent from the above embodiment, the logical channel control program 22 needs only the logical channel information, and the physical channel control program 23 needs only the physical channel information.

Next, the control information will be described with reference to FIGS. 3 and 4.

When controlling a full-duplex line, the logical channel to which the command is issued is the logical channel 11 for transmission and the logical channel 12 for reception, as described above.
If the tables shown in FIG. 3 are linked, it is possible to easily associate the logical channel information with the physical channel information of transmission or reception by tracing the pointer.

On the other hand, when controlling a half-duplex line, if it is transmission, the third
If the state shown in the figure is received, it is obvious that the state shown in FIG. 4 can be used to easily associate the logical channel information with the physical channel information.

Therefore, the logical channel control program 22 can change the link pointers 35 to 38 as long as it can recognize the half-duplex or full-duplex and the instruction execution physical channel. Channel control information (physical channel control table) can be easily provided.

EFFECTS OF THE INVENTION As described above, according to the present invention, the control programs for controlling the logical channel and the physical channel are independent, the control tables for the logical channel and the physical channel are separated, and the two tables are associated with each other. By dynamically changing, the control of the logical channel and the physical channel can be made independent, and the control program can be simplified and an effect can be obtained.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG.
FIG. 4 is a program execution state diagram of the present invention, FIG. 3 is a control table relation diagram in a normal state, and FIG. 4 is a control table relation diagram in a half-duplex reception channel control. 11, 12 …… logical channel, 13 …… sending channel, 14
...... Receiving channel, 15 …… Control unit, 21 …… Execution control program, 22 …… Logical channel control program, 23 ……
… Physical channel control program, 31, 32, 41, 42
... Logical channel control table, 33, 34, 43, 44 ...
… Physical channel control table, 35, 36, 37, 38,
45, 46, 47, 48 ... Link pointer

Claims (1)

[Claims] 1. A pair of two physical channels, a transmission channel connected to a communication line for transmitting data to and from the communication line, and a reception channel for receiving data to the communication line. A plurality of physical channel units, which are connected to a higher-level device and are a unit for transferring commands and data to and from the higher-level device by forming a pair of two logical channels to correspond to the pair of physical channels. In a communication control device of a micro program control system having a plurality of channel units, a logical channel control table storing information belonging to the logical channel is provided for each existing logical channel,
For information belonging to the physical channel, a physical channel control table is provided for each existing physical channel, and the physical channel of the physical channel on which the command is executed in the logical channel control table of the logical channel for which the command is issued. A first link pointer pointing to a channel control table and a second link pointing to the logical channel control table of the logical channel for which a command was issued in the physical channel control table of the physical channel on which the command is executed. Further, it has a pointer, and as a microprogram for controlling the communication control device, a unique execution control program, a plurality of logical channel control programs existing for each logical channel, and an instruction for each command from the host device. It has three kinds of physical channel control programs for controlling the physical channels, and the execution control program has a function of controlling commands and data transfer with the higher-level device and task management of the plurality of logical channel control programs. The logical channel control program exists for each of the logical channels, is activated by the execution control program, decodes a command from the higher-level device, and decodes the instruction to the physical channel control program according to a decoding result. The physical channel control program having a function of giving control information necessary for executing a command, a function of controlling execution of the physical channel control program, and a function of changing the first and second link pointers at an arbitrary time. Channel control program is before It is present for each command and has a function of executing the function supported by the command by controlling the physical channel based on the control information without depending on the logical channel and controlling the communication line. Communication control device.