JPS6161584B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a line control system, and more particularly to a system for reading information from a line correspondence section in a line control device into a common control section.

The communication control device exists between the central processing unit and the communication line, and controls the transmission and reception of data between the central processing unit and various terminal devices located at remote locations. The functions of the communication control device include line connection control and status monitoring, assembling and disassembling transmission characters, error detection and control, transmission control, data block assembly and buffering, and data transfer control with the central processing unit. etc.

BACKGROUND OF THE INVENTION A line control device that performs line connection control and status monitoring has conventionally been comprised of a plurality of line handling sections 2 and a common control section 1, as shown in FIG. In FIG. 1, one of the line handling units 2 is shown. The line correspondence section 2 is provided with two types of registers: a line information register 31 and a line control register 32.
The former holds line information and transmits the line information to the BUSIN line 10 upon receiving instructions from the common control unit 1.
Send to 5. The BUSIN line 105 indicates whether the device is inoperable, the device is terminated, the control device is in use, the device is in use, or
Status information such as pending termination interrupts, device request interrupts, and status changes during command execution is read.
The latter line control register 32 holds line control information sent from the common control unit 1 through the BUSOUT line 106, and controls the operations within the line correspondence unit 2 using this information. This BUSOUT106 has
light, initial, light, ball light,
Codes and data corresponding to commands sent from the central processing unit, such as read, memory read, write control, and sense, are sent out.

In the common control section 1, the address generated by the scanning address generation section 11 is sent to the address decoding section 12.
The selection signal 102 is decoded by the selection signal 102 for each line corresponding section 2. At the same time, the address signal 101 generated by the scanning address generator 11 is applied to the line control word memory 15 and becomes a read and write address. The information read from the line control word memory 15 and set in the line control word read register 16 includes information for controlling the line;
For example, it includes status information such as waiting for transmission permission, transmitting character, waiting for transmission completion, waiting for reception start code, receiving character, and waiting for reception end character. The control section 18 creates control information for the line correspondence section 2 based on the contents of the line control word read register 16 and the line information read register 14, and sends it out through the BUSOUT line 106. For example, if the status information of waiting for transmission permission is read in the line control word read register 16, and the transmission permission information is read out from the line information read register 14, a write command for the first character transmission is sent. The first data to be
It is sent to the BUSOUT line 106. Also, the control section 18
sends and sets a new control word for the processed line to the line control word write register 17.
If further transmission is to be continued in the above example, the status information during character transmission is set. The control signal generating section 13 is connected to the line corresponding section 2.
In addition to generating the CONTROLIN signal 103 and instructing to send the contents of the line information register 31 to the BUSIN line 105, the CONT-ROLOUT signal 10
4 to instruct the acquisition of BUSOUT information,
Also, the line information reading register 1 in the common control unit 1
Generate a capture instruction signal 107 for 4.
Give the timing to import BUSIN information.

An operating time chart of the line control device of FIG. 1 is shown in FIG.

When the common control unit 1 updates the line address at regular intervals, this address is decoded by the address decoding unit 12 and becomes the line selection signal 102 shown in FIG. 2a. Therefore, the line support section 2
is selected by the common control unit 1 at regular intervals. The common control section 1 sends the CONTROL IN signal 103 shown in FIG. 2b to the line correspondence section 2 in order to acquire the line information of the line correspondence section 2 within the selected time. The line support section 2 is
Line information is sent to the BUSIN line 105 in FIG. 2c at time _t1 during the period when the CONTROL IN signal 103 is on. The common control unit 1 waits for the line information to be sent to the BUSIN line 105, and then checks the time.
At _t2 , the line information is read into the line information reading register 14 of FIG. 2d. On the other hand, within the common control unit 1, the line control word is read out in parallel with the line information fetching operation.

As shown in FIG.
At _t3 , it is sent to the line handling section 2.

The output of the address generator 11 is used as the read address of the line control word, and the read contents of the line control word memory 15 are set in the line control word read register 16, and together with the contents of the line information register 14, the control unit Sent on 18th. Control unit 18
Now, determine the operation for the line correspondence section 2 during the scanning time, and send the BUSOUT line 10 to the line correspondence section 2.
6 is used to send the control information, and within the common control unit 1, the updated line control word is written into the line control word memory 15 through the line control word writing register 17. The control information sent via the BUSOUT line 106 is taken in by the line corresponding section 2.
The instruction is given by turning on the OUT signal 104 (time t ₃ ).

In this way, in the conventional system, the process from reading line information from the line handling unit 2 to sending control information to the line handling unit 2 is performed within the selection time T given to the line.

However, if the distance between the common control unit 1 and the line support unit 2 becomes long, it takes time from sending out the CONTROL IN signal to sending information to the BUSIN line, so It is necessary to lengthen the scanning time T by the delay time of the cable. For this reason, the line scanning ability of the common control unit 1 is reduced, and the scannable line speed is reduced. Further, when performing backup switching between the common control section 1 and the line correspondence section 2, a problem arises in that the cable length between the backup common control section and the line correspondence section 2 cannot be made long.

The purpose of the present invention is to solve such conventional problems by improving the line scanning ability without increasing the scanning time per line even when the cable length between the common control unit and the line corresponding unit is long. The objective is to provide a line control system that allows

In the present invention, a plurality of line compatible units are connected to a common control unit, the common control unit selects any of the line compatible units, reads data from the selected line compatible unit, and then the selected line compatible unit reads data from the selected line compatible unit. The premise is that data is written to the corresponding line corresponding section.
In such a system, a first selection means for reading and a first selection means following the reading operation are provided.
and a second selection means for performing this writing to the line correspondence section selected by the selection means, and the first selection means is configured to complete writing of one line correspondence section by the second selection means. It is characterized by a line control method that reads data from the next line corresponding section beforehand.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 3 is a block diagram of the line control device of the present invention, and FIG. 4 is an operation time chart of FIG.

In FIG. 3, parts having the same functions as those in FIG. 1 are given the same numbers.

In FIG. 3, compared to the conventional device shown in FIG. Set up.

The address delay unit 19 has a function of applying an appropriate delay to the address generated by the address generation unit 11 using a delay control signal 110. Note that there may be cases where the function is to provide a fixed delay regardless of the state of the delay control line 110. The output of the address delay section 19 is decoded by the address decoding section 20 to become a selection signal 109, which is used in a scanning cycle (hereinafter referred to as a control cycle) for determining line scanning capability. From the control signal generator 21, CONTROL/IN signal 103, CONTROL/OUT signal 104, BUSIN
The line acquisition instruction signal 107 is output in the same way as before, but the two signals 104 and 107 are
The sending timing is controlled by a delay control signal 110 which is a response signal to the CONTRL/IN signal 103.

Response signal generation section 33 provided in line correspondence section 2
gives a constant delay time to the CONTROL IN signal 103 and sends out a delay control signal 110.

As shown in FIG. 4 a, c, and e, at time t ₁ of the selection time of the preceding read cycle,
When the signal 103 is sent, the line corresponding section 2
The line information is sent to the BUSIN line 105, and the delay control signal 110 shown in FIG. 4d, which is a response signal to the CONTROL IN signal 103, is sent back at time _t2 . When the delay control signal 110 arrives, the common control unit 1 outputs BUSIN at time _t3 as shown in FIG.
The line information of the line 105 is taken into the read register 14.

Since the line information read cycle ends now, it is possible to move on to the next line read cycle.

As shown in FIG.
09 is turned on at time _t4 .

In this way, in the control cycle, since the line information read register 14 has already been set, the line control word is read from the line control word memory 15, and then the updated line control word is transferred to the line control memory 15.
Write to BUSOUT line 1 for line corresponding section 2.
The operation up to transmitting the control information at 06 is performed.

The cycle (control cycle) in which the CONTROL/OUT signal is sent in Figure 2e and the cycle in Figure 4g
As is clear from the cycle in which the CONTROL/OUT signal is sent (control cycle),
By preceding the line information read operation, the scanning time of the control cycle is shortened. Furthermore, since reading of the line information is always completed at the start of the control cycle, even if the distance between the common control unit 1 and the line corresponding unit 2 differs depending on the device, the read cycle and control Cycle time intervals can be easily controlled.

As explained above, according to the present invention, a line selection line for acquiring line information and a line selection line for sending control information to the line corresponding section are provided separately, and the readout cycle using the former selection line is Since the control cycle is preceded by the latter selection line, the distance between the common control section and the line corresponding section does not affect the control cycle, and the control cycle time can be significantly shortened without considering cable delay. It is possible to improve the line scanning ability. Furthermore, since the control cycle is started by the delayed control signal, which is a response signal to the CONTROL/IN signal, the time interval between the read cycle and the control cycle can be easily adjusted even when the distance between the common control section and the line corresponding section is different. can be controlled.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a conventional line control device, FIG. 2 is an operation time chart of FIG. 1, FIG. 3 is a block diagram of a line control device showing an embodiment of the present invention, and FIG. This is an operation time chart of the figure. 1: Common control section, 2: Line correspondence section, 11: Address generation section, 12, 20: Address decoding section, 13: Control signal generation section, 14: Line information reading register, 15: Line control word memory,
16: Line control word read register, 17: Line control word write register, 18: Control section, 19: Address delay section, 21: Control signal generation section, 3
1: Line information register, 32: Line control register, 33: Response signal generator, 101: Address signal, 102: Selection signal, 103: CONTROL・
IN signal, 104: CONTROL/OUT signal, 10
5: BUSIN line, 106: BUSOUT line, 107:
BUSIN information import instruction signal.

Claims (1)

[Claims] 1. Selecting a plurality of line compatible units by a common control unit, reading data from the selected line compatible unit, and subsequently writing data to the selected line compatible unit. The method includes a first selection means for performing the above-mentioned reading, and a second selection means for performing the above-mentioned writing to the line corresponding part selected by the first selection means following the reading operation. The line control system is characterized in that the first selecting means reads data from the next line corresponding section before the second selecting means finishes writing data in one line corresponding section. 2. A delay means is provided for delaying the address information by a predetermined time in response to the address information of the line corresponding section outputted by the first selection means, and the output of the delay means is input to the second selection means. A line control system according to claim 1, characterized in that: 3. A line control memory for storing line control information for each of the line correspondence units is provided in the common control unit, and the common control unit selects the line control information based on the address information of the line correspondence unit output by the first selection means. The method is characterized in that the corresponding line control information is read from the line control memory, and write data to be sent to the corresponding line corresponding section is created from the read data from the line corresponding section and the read line control information. A line control system according to claim 1.