JPS6136846A - Program control system - Google Patents

Abstract

PURPOSE:To shorten a command processing time by producing directly a PC address code from the input command data given from outside together with the mask information. CONSTITUTION:A mask control circuit 68 consists of a mask register 91 and a gate group 92 and performs the mask control for each bit to the input command data. Thus it is possible to delete (mask) the bits having no direct relation with production of an address code among those bits within the input command data or to produce an address code to a series of input command data.

Description

[Detailed Description of the Invention] [Technical Field] The present invention provides a program 'f stored in a storage means:
Concerning program control methods for analyzing and executing instructions.

[Prior art]

FIG. 1(a) shows a configuration in which a master device 11 and N (positive integer) slave devices 12 to 14 are connected in a master-slave manner, and FIG. 1(b) shows a configuration in which a terminal control device 21 and N slave devices are connected. [This shows a configuration in which 22 to 24 are connected in a cluster.

FIG. 2 is a block diagram showing a common control section in a slave device that employs a conventional program control method. In the figure, an instruction decoding and CPU (Central Processing Unit) control circuit 1 reads program instructions stored in a ROM or the like, decodes (analyzes) the instructions, and executes an operation or data input/output side a or a program counter ( pc) This is a circuit that performs program execution control for instructing address control. The instruction register 2 is a register for temporarily storing instruction codes for analysis and execution by the circuit 1. The internal register and flag circuit 5 temporarily stores calculation results and displays the internal status of the CPU during program execution. The address control circuit 6 is a program counter (PC) that stores addresses where program instruction codes necessary for executing the program are stored.
control. Data bus control circuit 3-wire, controls data input/output to and from the outside. In the conventional storage program control system, as shown in FIG. 3, external input data (for example, command data from a master device or a terminal control device) is shown.

(hereinafter abbreviated as command) When executing processing for K,
First, the command is parsed, jumps to the address corresponding to the result, and executes each frame according to the program instructions stored there. It is not suitable for high-speed control such as response-based control.

[Purpose of the invention]

An object of the present invention is to provide a method that can minimize the total processing time from inputting a command to analyzing the command and starting execution of processing corresponding to the command.

[Structure of the invention]

The method of the present invention is characterized in that at least the memory stored in the storage means 1) (
2) In a program control method for executing a 7' program, there is a command input control means for controlling the input of command data in response to a command data input request, and a command input control means for controlling input command data bit by bit. The mask control means includes a mask control means for performing mask control, and an address generation means for performing an operation on the data output from the mask control means and bias data and outputting the result of the calculation as an address in the reference means. .

〔Example〕

Next, the present invention will be explained in detail with reference to the drawings.

Figure $4 is a flow diagram illustrating the method of the present invention.

Referring to diagram *S showing a slave device used in the method of the present invention, this device includes a line control unit 51 that controls data input/output to and from a mask device or a terminal control device;
A program R,0M52 that stores program instructions,
Common control unit 53 and CPU/system control signal! 154
a, a system bus 54 including an address bus 54b and a data bus 54c, and a command input request signal line 55;
and a command input enable signal line 56.

FIG. 6 is a block diagram showing details of the common control section 53 used in FIG. In the figure, command input control circuit 6
1 is the 7th gJ 7 (according to the 2 chart, the signal line 55
Controls the input of command data in response to a command input request signal given via the controller. In the general storage program control method, as shown in Figure 8, one or more program instruction codes stored at the address indicated by the program color are successively stored, and the instructions are analyzed and executed. ing. Therefore, even if there is a command input request, immediately input the command data, convert the PC address, and set a new address for the program controller (PC) (hereinafter abbreviated as command manual-address conversion processing). I can't. That is, command/car addon conversion processing is possible only at the unit 800 of program instruction interpretation, which is the demarcation point between instruction codes, and demarcation point 81 (see FIG. 8). In FIG. 7, step a receives the detection information of this demarcation point 81 from the instruction decoding and CPU control circuit 62, and the process of detecting this demarcation point results in 1.

Step bVi is a process of fully detecting whether or not a command input request signal is output from the line control section 51 via the signal line 55 when the demarcation point is known in step a. Step C is a process of temporarily stopping the operation of the circuit 62 when the command input request signal is detected in step b. In step d, a command human input enable signal is transmitted to the line control section 51 via the signal line 56, and in response to reception of this input enable signal, command data transmitted from the line control section 51 via the data bus 540 is transmitted. Mask control circuit 6
This is the process of causing the 8 to receive the data. In step e, the output of the mask control circuit 68 is received by the command-address conversion circuit 67, and the output of the circuit 67 is received by the PC address control circuit 69.
This is the process of having the receiver receive the message. Step f is a process for restarting the operation of the circuit 62.

Referring to FIG. 9 showing the mask control circuit 68, this circuit is comprised of a mask register 91 and a gate group 92. This circuit performs bit-by-bit masking control on input command data. Bits in input command data that are irrelevant for direct address code generation are removed (masked), or one address code is generated for a series of a plurality of input command data. Mask data from path 70 is set in advance in the mask register. Gate group 92 communicates this mask data with bus 5.
It performs a logical operation with input command data from 4C and outputs the result to signal line group 68Jl. A mask output enable signal from the signal line 93 controls whether or not mask control is performed.

Referring to FIG. 10 showing the command-address conversion circuit 67, this circuit is composed of a bias register 101 and an arithmetic unit 102. Bus 7 for bias register
Bias (pace address) data is preset from 0. The arithmetic unit 102 performs four arithmetic operations on this bias data and the data given from the circuit 68 via the signal line group 6831, and outputs the result as an address to the address color in the circuit 69 via the signal line group 67ai. do.

In this way, in this embodiment, external input commands and
By adding the function of directly generating a PC address code based on the data, taking into account mask information, and setting it in the program address color, it can be applied to a wide range of 9 command data formats, and the command data Analysis and execution of command processing can be started in the shortest possible time, so commands can be received and processed in a short time, similar to methods where functions are controlled in the form of commands from a master device or terminal control device for multiple slave devices. , execute command processing, and realize high-speed control necessary to execute response processing.

〔Effect of the invention〕

As described above, the present invention has the effect of minimizing the processing time from inputting a command to analyzing the command and starting execution of processing corresponding to the command.

[Brief explanation of drawings]

WIJ1 Figure is a block diagram showing the system configuration used in the present invention, Figure 2 is a block diagram showing the common control unit used in the conventional system, Figure 3 is a flowchart for explaining the conventional system, and Figure 4 is a block diagram showing the common control unit used in the conventional system. Flowchart for detailed explanation of the invention, No. 5
Figure 6 is a block diagram showing a slave device used in the system of the invention, and Figure 6 is a block diagram showing a common control unit used in the system of the invention. Figure J7 is a flowchart showing the operation of the command input control circuit, Figure 8 is a diagram showing the storage state of instructions, Figure 9 is a block diagram showing the mask control circuit, and Figure 10 is a block diagram showing the command-address conversion circuit. It comes out. In the figure, 1,62...instruction decoding and CPU control circuit, 2.63...instruction register,
3゜64...Data bus control circuit, 4,65...
... Arithmetic circuit, 5, 66 ... Internal register and flag circuit, 6 ... PC address control circuit, 51 ... Line control section, 52 ...・・・
・Program R, OM, 53...Common control section,
54...Pass% 61...Command input control circuit, 68...Mask control circuit, command-address conversion circuit. Fig. 1 02 Tsuku 1 (b) Plexus a Centroid S Fig. 6 Centroid 7 Fig. θ

Claims (1)

[Claims] In a program control method for executing at least one program stored in a storage means, a command input control means controls the input of command data in response to a command data input request; mask control means for performing mask control on a bit-by-bit basis; and address generation means for performing an operation on data output from the mask control means and base address data and outputting the result of the operation as an address in the storage means. A program control method characterized by: