JPS58144932A - Data transmission and reception controller having decentralized processing function - Google Patents

Abstract

PURPOSE:To decrease the time consumed by a CPU and the response time to the process for interruption required for a data transmission/reception controller, in an electronic computer, by performing a part of the control process by said controller. CONSTITUTION:A data transmitting/receiving controller 100 is provided with an IEEE-IB interface 120 and a control circuit 110 which performs the control of the interface 120 and the transfer of data to an electronic computer and stores the instruction groups for control of devices 400 and 500 connected to an IEEE- IB L8 with its control of execution. A channel interface circuit 300 conncets the device 100 to an electronic computer 200; while a signal group L1 connects the computer 200 to the interface circuit 300. The circuits 300 and 110 and an interface circuit 120 are connected each other with signal line groups L2-L5.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control device that executes a group of execution control commands, which is a collection of data transfer commands and control procedure commands between devices and electronic computers, and particularly relates to a data transmission system suitable for electronic computer systems. This invention relates to a reception control device.

In recent years, with the expansion of the field of application of digital computers, electronic computers have been increasingly used to control experimental equipment and process equipment. With this expanding use, many methods of data transfer between electronic computers and laboratory and process equipment have been proposed. As one of them, IEE
I-EEE-IB (IEEE-Interface) standardized in E Std 488-1978.
BuS). For a detailed explanation of the IEEE Std 488-1978 standard, please refer to the publication below.

”IEEE 5 standard Digital
Interface for l)logramma
ble Instrumentation”; Am
erican national 5tandar
ds ■ n5 titute, 1979-7 Generally,
When a computer uses IEEE-In to control experimental equipment, etc., it is connected to the computer and uses IEEE-In.
Data transmission/reception control K that fully realizes IB interface
1 device is a controller that controls the entire IEEE-IB. The controller is an IEEE-
It has a function of sending commands to the IB interface, such as address designation and interface control commands. As shown in the flowchart in Figure 1 of JIIIH1, a typical method in which an electronic computer, which is a controller, controls experimental equipment is as follows: ■ Sending data containing instructions to the equipment (1); ■ Executing the equipment. Read the status indicating the situation (2), ■ Check whether the read status is execution complete, and if the status does not indicate execution completion, return to 2 (3), ■ Execute the command from the device to the location. Since it takes time to complete the process, repeat steps 2 and 3 in Figure 1 several times. If this loop is executed 6 times,
0.1 MIPS (Mil on In5tructi
A small computer with a capacity of about 200 m5 CPU (Central
l Processor Unit) time is consumed. It should be noted that in order to execute the turnout number 2 in FIG. 1, a machine instruction typically executes about 3000 steps.

Generally, multiple application programs are executed simultaneously on a small computer, and executing the loops 2 and 3 in Figure 1 six times will reduce the processing time of other application programs by approximately 200 m.
It will be delayed by 5.

Another typical method 1 for an electronic computer to control experimental equipment is to send data containing instructions to the equipment to the equipment (5), as shown in the flowchart in Figure 2.
■Wait until an interrupt occurs to indicate that the execution of the previous command has been completed (6), ■Read the status indicating the execution status of the device (7), ■Read the result from the device (8)
, is the procedure. In this step 11@, unlike the previous procedure, the status indicating the execution status of the command is read from the device only once. Therefore, as in the previous example, 2 and 3 in Figure 1
Although this loop is not repeated, the 11 electronic computers are generally shared by multiple programs, so if the CPU usage rate of the electronic computer is high, even if an interrupt occurs at 6 in Figure 2, it will not occur at 7. I can see that the execution of the process in step 8 will be completed. For example, if the CPU utilization rate of the above-mentioned small computer is 60%, an average of about 300 m5 is required until an interrupt occurs at step 6 and execution of process 111 at step 7 occurs.

In order to obtain this value tS, the M/M/E model of queuing theory (Kleinlock: Queuing System Theory Chapter 3.2; Kyoritsu Shuppansha) tl- was used. This waiting time may be too long for some devices.

The purpose of the present invention is to reduce the CPU consumption time of an electronic computer and reduce interrupts from the device by having the data transmission/reception control device perform part of the processing that was conventionally performed by the electronic IT device. An object of the present invention is to provide a data transmission/reception control device that reduces the response time JtdIj for processing.

The present invention is a data transmission/reception control device that includes an interface circuit that performs all data transmission, and a control circuit that controls that circuit and data transmission to and from the computer, by improving the functions of the control circuit. It is to carry out part of the processing that has been carried out. That is, the control circuit performs the processing shown in the flowcharts of FIGS. 1 and 2. A group of instructions to be executed according to such a flowchart is stored in the control circuit in advance, and when actually executed, an identifier is used to select a necessary instruction group t-x from one or more stored instruction groups. Only the data necessary for execution is transferred between the computer and the computer. In many electronic computers, one or more commands can be executed consecutively by performing a command self-chain with a single input/output command (HITACM series processing equipment manual (Chapter 8080-2-00104; Hitachi, Ltd.). It is possible to execute a group of instructions by executing an input/output instruction once.Thereby, the CPU consumption time can be reduced.In addition, interrupt processing as shown in Figure 2 can also be performed by the data transmission/reception control device. As a result, interrupt processing can be performed with a fixed time delay regardless of the CPU utilization rate of the computer.

Since the control path carries out instructions for advanced functions,
It is desirable to implement this using a microcomputer.

An embodiment of the present invention will be described below with reference to FIG. In the figure, 100 is a data transmission and reception control device which is the center of the present invention, including a data transmission and reception control device 100U, IEEE-IB
Control of the IEEE-IB interface circuit 120 and the IEEE-IB interface circuit that realize the interface, control of data transfer with the computer, and IE
Device 400 and device 5 connected to EE-IB L8
A group of instructions that control 00 (hereinafter referred to as an execution control instruction group).

) and its execution. The channel interface circuit 300 performs a Wk connection between the data transmission/reception control device 100 and the computer 200, and is an ICP (ICP) for HITACL-330.
interface Control process
This corresponds to the ≠ Yarnel interface part of .r). The signal line group L1 is a signal line group connecting the electronic computer 200 and the channel interface circuit 300, and includes a data signal line, an address signal line, and a control signal line. The signal line group L2U is a data signal line, the signal line group L3 is an address signal line, the signal line L4 is a write signal, the signal line L5 is a read signal, and signals #L6 and L7U interrupt signals. Channel interface circuit 300, control circuit 110s and IEEE-IB interface circuit 12
0 is the signal line group L2°L3. Connected by L4 and L5.

Next, the configuration of the data transmission/reception control circuit 100 will be explained using FIG. 4. Signal +1) L2. L3. L4, L5 and L6 are the same as in FIG.

111 is a microcomputer, which is usually commercially available. 113 is ROM(l(, ead
0oly Memory), 114 is RAM (l
andom Access Memory). 122 and 123tuInte1's IEEE-IB
LS I for interface (Large 5ca
124 and 123 are Jnte1's IEEE-IB transceivers M 8 I (Medium Scale Integr
ation). Detailed description of these and signal group L13. L14. L15. L16゜LSI and L8
For the explanation of 2, please refer to all the publications listed below.

(1) 8291 GPIB TALKER/LIS
TENERData 5sheet; Intel1 (8292 GPIB C0NTR0LBR)
)ata 5heet H■nte1 company (3) 82
93 GPIB 1'RANSCEIVER; I
The nte1 company 121 is the one that sends and receives data to and from the data signal line group L2.
Signal lines Lll and L that select registers in 22 and 123
12t-create address-decoder. 112H30
Receives interrupts from 0 and 122 ff1L, ff (black)
The computer 111 is notified of the interrupt using an interrupt signal L61.

Data transfer between the electronic computer 200 and the RAM 114 is performed through the entire channel interface circuit 300. I
For data transfer with EEE-IB, RAMI 14 and 12
2 through the microcomputer I'll. The controller function of the IEEE-IB interface is realized by 123.

Commands from the electronic computer 200 to the data transmission control device 100 are given as command codes.

This command code list is shown in FIG. device 400
RAMI 1
4, send the identifier of the execution control command group sent by the next command code x"os" with the command code X"OB", and then send the command code
The execution control command group is transmitted in 5#. To execute a group of execution control instructions, an identifier is transmitted with the command code "X@OF" and the group of execution control instructions having that identifier is activated.

Command codes X@O1" and X"02# transmit and receive necessary data during execution of the execution control command.

FIG. 6 shows the structure of control tables and buffers in the RAM 114. The control table 10 has an identifier field 20,
This is a collection of records 11 consisting of a length field 30 and a point field 40. The identifier field 20, length field 30, and point field 40 respectively indicate the identifier name and length of the execution control instruction group, and the position of the execution control instruction group storage area 51 in the execution control instruction group storage Boolean 50. There is. The execution control instruction group storage pool 50 is an area for securing one or more execution instruction control group storage areas. The identifier storage buffer 60 is an area that temporarily stores identifiers.

Further, the execution control instruction group storage buffer 70 is a buffer that temporarily stores the execution control instruction group.

According to the flowchart in Figure 7, the microcomputer
- Processing of the command code processed in step 111 will be explained. Where is the command code? +7) Ki@t';
J% 11 children tE calculation m 200 YoC signal #L6t - Communication is performed by a command reception interrupt to the microcomputer. After the command reception interrupt, the command is received (700), and the process branches to the corresponding processing routine according to the command code (701). When the command code X'''OB'' is received, it is checked whether there is an empty record in the control table 10 (710), and if there is, the identifier is stored in the identifier storage buffer 60 (712). Also, if there are no free records, an error will occur.
Set the code (711). Command code X'
When "05" is received, as shown in the flowchart of FIG. 8, the transferred execution control instruction group is stored in the execution control instruction group storage buffer 70, and its length is calculated.
(721) Search for an empty area in the execution control instruction group storage pool 50 that can store the transferred execution control instruction group (722). If there is no free area, set an error code 726), and if there is a free area, set the execution control instruction stored in the execution control instruction group storage buffer 70 in the free area in the execution control instruction group storage pool 50. 724), and stores an identifier, a point indicating the length and storage position of the stored execution control instruction group in an empty record of the control table 10 (725). If the received command code is X""OF", enter the identifier (730) and the transferred identifier
It is checked whether it is registered as 0 (731). If the registration has not been completed, please send the error code (733).
), if the registration is invalid, then the execution control command group having the identifier that has been transferred is activated (734). If the command code is X@″01#, check whether a computer-like data input command is being executed in the execution control command group being executed (
740), and if not executed, waits until the data input command is executed (741). If executed, data is input from the electronic computer to a predetermined storage area specified in the data input command (742).

If the command code is "X'02", check whether the data output command for the electronic computer is being executed in the group of execution control commands being executed (750), and if the command is not sent to the center,
Wait until the data output command is executed (751). If executed, the data in the predetermined storage area specified in the data output instruction is output to the computer (752).
.

Next, the execution control command group will be explained. FIG. 9 is a flowchart of a group of execution control instructions when the data transmission/reception control device executes the processing of the flowchart of FIG. 1, which is performed by an electronic computer. The execution control instruction group is a group of instructions that are written so that a microcomputer can execute the process shown in this flowchart. (or intaburi)
It may be something like a high-level language that requires (Interpret). It is only necessary that the microcomputer be in a form that can be executed by the time all the processes indicated by the execution control command group are executed.

The procedure for controlling the device 400 connected to the data transmission/reception control device 100 will be described according to the flowchart in FIG. The electronic computer receives data to be sent to the device 400 (800'), and sends a complete command eIEEE-IB L7 to send data to the device 400 (801).
). This command is determined by the IEEE-IB interface, and specifically, the device [400 listener address (I, 1stner Address)]
). Subsequently, the data sent from the computer is sent to the IEEE-IBL L7 (802). In order to check whether the device 400 has completed the execution of the data sent earlier, the status is read from the device 400 (
803), it is checked whether the contents of the read status mean that the operation of the device 400 has been completed (804). If it is not completed, read the status of the device 400 again, and if it is completed, the device 400 is the data? A command t-IEEE-IB Lr7 indicating sending is sent (805).

This command is also determined by the IEEE-IB-"interface, and specifically, the talker address ('I"alker Address) of the device 400.
It is. Next, the data sent from the device 400 is
Input from EE-IB L7 (806).

Send the input data to the computer 200 (807
).

10 and 11 are flowcharts of a group of execution control commands when the processing of the flowchart of FIG. 2 is executed by the data transmission/reception control device. The difference between the flowcharts in FIGS. 10 and 11 and the flowchart in FIG.
The interrupt signal indicating that all services are requested from device i[400] is used as a trigger to check whether the operation of device i[400 is completed. 810, 811, 8 in Figure 10
Steps 12 and 814 are the same as steps 800, 801, 802 and 807 in FIG. 9, respectively. Also, 820, 821, 822 and 823 in FIG. 11 are replaced by 803 in FIG.
804, 805 and 806 are the same. 813 in Figure 10
This is a process in which all parties wait for processing with a 1 attached to the report (824) that data has been received from the device 400 at 824 in FIG.

Each execution control instruction ## that performs the processing in the flowcharts in FIGS. 9 and 10 has an identifier, and a command code
It is activated with "OF". However, the execution control command group for performing the interrupt processing shown in FIG. 11 waits for a special identifier, and is activated when an interrupt occurs. Since the execution control command group is transferred from the electronic computer 200 before execution, it can be freely changed or added as necessary. The contents of the tfc and execution control command group can be freely described as long as they are within the range that can be executed by a microcomputer.

To start the execution control command group that performs the processing in the flowchart of FIG.
OF" is used to transfer the data from the computer to the data transmission/reception control device. Execution of the command e-code By chaining commands, the command code X102'' required for execution can be executed by a single input/output command from the computer.

Also, as shown in the flowchart in Figure 10.11,
Since interrupt processing can also be handled by the data transmission/reception control device, there is no need for interrupt processing by the electronic computer. However, it is also possible to perform interrupt processing on a computer as usual. This can be done by including a process for generating an interrupt in the computer in the execution control instruction group.

Data transfer between the device and the computer is done using DMA (Direct Transfer).
ctMemoryAccess) transfer is also possible. In this case, the data to be transferred is not temporarily stored in the t-FtAM, so faster data transfer is possible.

According to the present invention, a part of the control of the device connected to the data transmission/reception control device, which was performed by an electronic computer, is registered in the data transmission/reception control device as a group of execution control commands.
Since the execution control command group can be selectively executed using an identifier that identifies the group, the CPU time of the electronic computer that controls the device becomes unnecessary, and the load on the electronic computer is reduced. In addition, since the data transmission/reception control device can process interrupts from devices, it is possible to execute interrupts in a fixed amount of time regardless of the usage rate of the computer, and the response time to interrupts from devices is constant. It has the effect of

[Brief explanation of the drawing]

Figure 1 4-! Diagram showing the processing steps when the IEEE-IB I/Tough Ace controller controls the entire device, Part 2
The figure shows the processing procedure when interrupts are used. Figure 3 shows the data transmission/reception control device, electronic computer, channel interface circuit, IEEE-IB and devices connected to IEEE-IB, including the present invention. Figure shown, 4th
The figure shows the configuration of the data transmission/reception control device in Figure 3, Figure 5 shows a list of command codes, Figure 6 shows the tables and buffers on the RAM, and Figure 7 shows when receiving commands. Processing flowchart)? Figure 81 shows a flowchart of the processing of command code Figures 10 and 11 show a 70-chart of a group of execution control commands executed by the processing tube data transmission/reception control device of Figure 2. ! J 3 Inpu 4 Ward tta IZ5 5th Figure 3 Code List 2 Figure 0 fJ7 Figure 3 Figure T q Figure + IJtθ Figure II fid Matters (Procedural amendment (method) Indication of gravity 1982 patent Application No. 27423'ft Akira's Name Person who operates data transmission/reception control device with distributed processing function i1E・・II・(-Ichizawa:Jl:II
Standing Seisakusho... Zu:, 11 (Katsu)
Osamu Shigeyo Jinzuzuson 5VI lJ ν

Claims (1)

[Scope of Claims] 1. A data transmission and reception control device that controls data transmission between a data source or a data expense source and a computer according to instructions from the computer, which includes: (1) connected to the data transmission and reception control device; It holds one or more execution control instruction groups that are a collection of data transfer instructions with the device, data transfer instructions with the electronic computer, and control procedure instructions, and connects the electronic computer and the data transmission/reception control device according to the execution control instruction group. (2) means capable of transmitting and receiving information necessary for executing the execution control command group to and from the computer during execution; (3) means for selecting a specific execution control command group from among one or more held execution control command groups; and (4) a service request from a device connected to the data transmission/reception control device. A data transmission/reception control device characterized by comprising means for interrupting execution of a group of execution control instructions being executed and executing interrupt processing that is one of the group of execution control instructions when an interrupt signal is detected. .