JPS62296242A - Microprogram controller - Google Patents

Abstract

PURPOSE:To earlier discover an error occurring in a microprogram controller by providing a display function to inform the execution of the instruction in order to detect the run-away. CONSTITUTION:When a program 6 is stored into a control memory device 2A, a hexadecimal FF is buried to the unused area. When the instruction code and hexadecimal FF buried to the unused area are executed by some reason, coincident conditions occur in an instruction comparator 4, and the output 5 of the instruction comparator 4 is generated. The output 5 is inputted to an indicator 7, informed to an operator and simultaneously, the program to execute an abnormal processing stored from a hexadecimal 38 address is started. As the indicator 7, a light emitting diode, a buzzer, etc., are suitable.

Description

[Detailed Description of the Invention] 3 Detailed Description of the Invention [Field of Industrial Application] The present invention relates to microprogram control using a microprocessor, and particularly relates to a display function that indicates runaway detection when an instruction is executed. [Prior Art] Fig. 3 is a block diagram showing the basic configuration of a conventional microprogram control device, in which C is a microprocessor and (2) is a microprogram storage device. The control storage device (3) is a local bus for exchanging data between the microprocessor (C) and the control storage device (C). Its operation will be explained below.The microprocessor (c) transfers the microprogram contained in the control storage (2) to the local bus (c).
3) Extract and execute instructions one by one. Normally, instructions are executed one after another, but depending on the instruction, there are cases where an instruction at another address is taken out and executed instead of the first instruction.

[Problem that the invention seeks to solve]

Since the conventional microprogram control device is configured as described above, the microprograms stored in the control storage device (1) perform several functions according to the order in which they are retrieved and executed. 7 Therefore,
This microprogram must be executed in the correct order.

Mikulov's own mistake, or.

This order may not be performed correctly due to a failure of the microprocessor (c). If such a situation occurs, in a conventional microprogram control device, the microprogram will run out of control, and as a result, the operator's operation will be interrupted. This invention was made to solve the above-mentioned problems. In the event that
Immediately notify the outside world and at the same time execute the retrieved command.

Aim to obtain a microprogram S device that displays a jump command to a program for abnormal processing 7 [Means for solving problems] A microprogram control device according to the present invention is , a microprocessor and a control storage device, and when writing a microprogram to a control storage device controlled by a microprocessor, an instruction for runaway detection must be written in an unused area, and a runaway detection When an instruction for detection is executed, it has a display function to indicate this fact, and the above-mentioned instruction is configured to be a jump instruction to a specific address in the control storage device. In the microprogram control device according to the invention, if an instruction in an originally unused area is executed due to an invalid microprogram or a malfunction of the microprocessor, an indication indicating that the event has occurred is provided. As soon as the function becomes operational, the instructions specified in the specific memory location where the recovery program is stored can be executed, allowing the operator to immediately notice an abnormality and creating a highly reliable microprogram. can be executed.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
The figure is a block diagram showing a microprogram controller according to the present invention. In the figure, (/A) is a microprocessor, (2) is a control storage device, (3) is a local bus, and (Hiro) is an execution The command being attempted is a 76-decimal OF
(6) is the output from the instruction comparator (lI) when the above comparison matches, and (6) is the output stored in the control storage (-A). The microprogram (7) is a display that inputs the output (event) of this instruction comparator. Therefore, the above-mentioned instruction comparator (ll) and display i (7) are function(
ff). Figure 1 shows the inch/I/K Ot! adopted as a microprocessor. FIG. 2 is a configuration diagram showing the format of an r (manufactured by Intel Corporation) (Norister) (R8T) instruction.

The microprogram control device according to the present invention is constructed as described above, and its operation will be explained below. In this embodiment, a case will be explained in which the above-mentioned Intel's GOT is used as the microprocessor. In this Intel's computer, if the instruction code is OFF in hexadecimal, the instruction is executed from address 3S in the /A base as shown in Figure 2) (R3T
) becomes a command. Therefore, /A base number OFF, ie, R8T command is used as the runaway detection command, and address 35 of /Hex number is selected as the specific storage location where execution starts when this R8'l' command is executed.

Next, when storing the program (6) in the control storage device (UA), an /A-adic number OFF is embedded in an unused area. In addition, when the Intel ROTs is not running and an access outside the area occurs, it is normal to turn off the data read into the microprocessor in hexadecimal, but this is done by embedding it in an unused area. Produces the same result as the instruction FF. In such a microprogram control device, if for some reason an attempt is made to execute the instruction code embedded in an unused area, 76-decimal OFF, a match condition occurs in the instruction comparator (), and the instruction comparator ( A second output (evening) is generated. This output (evening) is input to the display (7) and is notified to the operator. At the same time, the stored abnormality handling program starts from address 31 in 76-decimal notation. In this embodiment, a light emitting diode, a buzzer, etc. are suitable as the indicator.

In addition, in the above-mentioned embodiment, a case is shown in which an instruction comparator is used as a display function to inform the operator that a command for runaway detection has been executed. , the above-mentioned command comparison can be carried out by using a question and answer means with the operator as a light display function, which can be realized by a program stored from a specific memory address, in this embodiment, 76-decimal address 3g. It is also possible to omit the equipment and display and have the operator interact in a question-and-answer format via a display device (not shown) to learn the above-mentioned status.

〔Effect of the invention〕

As described above, according to the present invention, since it has a display function to notify the execution of an instruction for runaway detection,
The structure is designed to quickly detect errors that occur in the microprogram control device, prevent the program from running out of control after the error is detected, and execute an appropriate recovery program, resulting in a more reliable microprogram. This has the effect of providing a control device.

[Brief explanation of drawings]

tg1 is a block diagram showing a microprogram control device according to an embodiment of this invention, FIG. 2 is a block diagram showing the format of the R8T instruction used in the embodiment of this invention, and FIG. 3 is a conventional microprogram control FIG. 2 is a block diagram showing the device. (/A) is the microprocessor, (2) is the control storage, (3) is the local bus, (ri is the instruction comparator, (even) is the output from the instruction comparator, (ru) is the micro program , (ri) is a display device, and 0> is a display function. In addition, in the figures, the same reference numerals indicate the same or equivalent parts. Figure 1/1A

Claims (3)

[Claims] (1) The microprogram stored in the control storage device is retrieved from another area in the control storage device sequentially or by a correctly executed jump instruction, and the instructions are executed by the microprocessor. When the instruction is executed in the microprogram controller,
An instruction to jump to a specific location in a control storage device is defined as an instruction for runaway detection, and this instruction is embedded in an unused area of the control storage device, and when the instruction for runaway detection is executed, A microprogram control device characterized by having a display function to indicate this. (2) The microprogram control device according to claim 1, wherein the display function is performed by a question-and-answer means with an operator using a program stored from a specific memory address. (3) The microprogram control device according to claim 1, wherein the display function comprises an instruction comparator and a display device connected to the microprocessor and control storage device.