JPH04252315A - Processor resetting method - Google Patents

Abstract

PURPOSE:To apply a general-purpose microprocessor chip even to a processor of a switchboard, etc., that requires the high reliability processor by attaining the initialization to each operation mode of the processor with a simple means. CONSTITUTION:The factor of initialization is set to a reset status register RSR with an initialization request and a microprocessor muP is started. The mode definition date stored in a ROM is set to 8 relevant register group RSG. Then the muP reads the RSR and analyzes the factor of initialization. In regard of the general initialization, e.g. a resetting operation performed through an external switch, the normal initialization processing is carried out. In regard of the initialization proper to an operating mode, i.e., a reset state caused by a trouble, the trouble recovering method is decided based on the date on the operation mode. Then, an initialization routine is selected and carried out in response to each operation mode. The muP clears the RSR at the end of an initial routine and runs or halts a central processor unit CPU in response to the operation mode. Finally the muP halts itself.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for resetting a processing device such as a switch, and more particularly to a method for initializing a processing device such as a switch or communication device.

0002

[Prior Art] In order to ensure high reliability of processing devices applied to telephone exchanges, communication equipment, etc., for example, one extra spare processing device is prepared to create a redundant configuration with duplication. I'm picking it up. In order to achieve uninterrupted operation, the system is equipped with a special initial setting circuit that automatically detects failures and switches over the duplex processing equipment in a short period of time to ensure high reliability.

In other words, this initial setting circuit has an initial setting function such as initializing the processing device and restarting it from the restart address of the main memory when a failure of the processing device is detected, and depending on the situation of the failure, the initial setting function of the processing device is initialized. It is equipped with an initial setting function that loads programs, data, etc. from a file storage device into the main memory and restarts from the restart address of the main memory, achieving high reliability.

[0004] Furthermore, in a multiprocessor configuration including a plurality of the above-mentioned processing devices, if the initial setting is not restored to normal even after performing the initial settings multiple times, it is possible that a failure of the own processing device affects other processing devices. Some devices also have functions such as a method to self-stop after initial settings are made to avoid any adverse effects.

[0005]

[Problem to be Solved by the Invention] Conventionally, in processing devices such as exchanges equipped with various initial setting functions, the initial setting function has been realized using individual ICs or dedicated LSIs. A method of configuring an optimal circuit for each processing device with different functions has been superior in terms of performance and economy.

[0006] In recent years, with rapid progress in component technology for microprocessors and the like, higher density and higher integration have become possible, and the performance of processing devices and the like has improved. As general-purpose microprocessor chips (MPUs) have become available at low prices, they have come to be used in switching equipment processing equipment that requires high reliability and high performance. . However, if high reliability is achieved by providing each device with a special initial setting circuit as described above around the microprocessor chip MPU, economical efficiency cannot be achieved.

That is, since the required initial setting functions differ depending on the purpose of the processing device, it is not economical to realize each initial setting function with separate circuits. Furthermore, a method in which all of the various initial setting functions are performed in one circuit is difficult to implement and has the disadvantage of increasing the circuit scale.

An object of the present invention is to solve the above-mentioned problems, to easily realize initial settings for various operating modes of a processing device with a simple circuit, and to provide a solution for processing devices that require high reliability, such as switching equipment. Also a general-purpose microprocessor chip M
An object of the present invention is to provide a method for resetting a processing device to which PU can be applied.

[0009]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides reset instruction signal sending means for sending out a reset instruction signal by a factor external to a processing device or internal to the processing device, and When a reset instruction signal is received, the processing apparatus includes a factor display means for displaying the cause of the reset instruction signal, and a plurality of initial setting means for making initial settings according to the operating function of the processing device, and determines the contents of the cause display means. According to the identified factors, one initial setting means is selected from among the plurality of initial setting means, and initial settings are performed on the processing device according to the operating function.

0010

[Operation] The present invention memorizes the operation mode that defines the operation of the processing device such as its application position and purpose, and also stores and displays the causes of the initial settings, and displays the factors of the initial settings according to the operation mode. By referring to and analyzing the cause of the initial setting that has occurred, identifying it, and executing the initial setting that corresponds to the memorized operation mode, when the cause of the initial setting occurs,
Execute initial settings according to the stored operation mode.

[0011]

Embodiments Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an embodiment of the present invention, showing an example of the overall configuration of a processing device.

[0012] The CPU is a central processor unit and is composed of a general-purpose microprocessor chip MPU or the like. MM is a main memory that stores programs to be executed by the central processor unit CPU, and also stores in a part of the area a microprogram routine that is a means for executing initial setting functions, that is, an initial setting routine.

[0013] In order to avoid the need to rewrite the routine for executing this initial setting and to prevent it from being adversely affected by the central processor unit CPU, etc.,
It consists of read-only memory (ROM). Further, in a part of the area of the read-only memory ROM, data defining the operating mode of the central processor unit CPU, etc., such as the operating configuration and operating functions, is stored.

[0014] The data defining this operating mode is used to indicate that the redundant configuration of the central processor unit CPU is, for example, a duplex mode with a duplex configuration, and to define the initial values of various timers such as a watchdog timer. This is the data. This definition data is data set in the register group (RGG) of the peripheral circuit (PEC), and is set by the microprogram of the initial setting routine.

[0015] Also, in the register group RGG, there is a reset status register (RSR) that displays the cause of the initial setting.
Equipped with. The reset status register RSR is necessary for reference when selecting an initialization method in the initial setting routine.

In order to execute this initial setting routine, a small microprocessor (μP) of, for example, about 8 bits is shown in this embodiment in addition to the central processor unit CPU.

Note that the central processor unit CP
It is also possible to use the microprocessor chip MPU in the U, but the central processor unit CPU
etc., it is more reliable to implement it using a different microprocessor chip MPU, that is, a small microprocessor μP.

FIG. 2 shows a general flow of operations when an initial setting request occurs in FIG. 1.

When a request for initialization is generated internally or externally, the cause is set in the reset status register RSR. Also, the microprocessor μP is activated. The microprocessor μP then reads the contents of the read-only memory ROM in the main memory MM, and an initialization routine is executed according to the contents.

In this routine, first, mode definition data in the read-only memory ROM is set in a register group related to the register group RGG (step 10).

After setting, the microprocessor μP reads the reset status register RSR and analyzes the cause of the initial setting (step 20).

[0022] For general initial settings, such as resetting from an external switch, the normal initial setting process,
For example, the central processor unit CPU is initialized and an instruction to restart from the restart address of the main memory MM is executed.

On the other hand, in the case of initial settings specific to the operation mode, ie, reset due to a failure, a recovery method after the failure is determined and executed based on the data of the operation mode. For example, an initial setting function for self-stop to prevent failures from spreading to the outside, an initial setting function for executing an initial program load IPL that loads programs, data, etc. from a file storage device to the main memory MM, etc. Select the initial setting routine according to the operation mode of the (Step 3)
0).

When the initial setting routine is completed, the microprocessor μP clears the reset status register RSR (step 40).

[0025] Furthermore, the central processor unit CP
U is set to run or halt depending on the operation mode (step 50).

Finally, the microprocessor μP halts itself.

[0027]

As explained above, the present invention has a register indicating the cause of the initial setting and an initial setting routine that executes the initial setting, thereby facilitating initial setting for various operation modes with a simple circuit. This has the effect that the general-purpose microprocessor chip MPU can be applied to processing devices such as switchboards that require high reliability.

[Brief explanation of the drawing]

FIG. 1 is an embodiment of the present invention.

FIG. 2 is an operational flow diagram of an embodiment of the present invention.

[Explanation of symbols]

CPU Central processor unit MM Main memory PEC Peripheral circuit RGG Register group RSR Reset status register μP Microprocessor ROM Read-only memory

Claims (1)

[Claims] 1. Reset instruction signal sending means for sending out a reset instruction signal due to a factor external to a processing device or internal to the processing device; and upon receiving a reset instruction signal from the reset instruction signal sending device, the cause of the reset instruction signal is determined. It is provided with a factor display means for displaying and a plurality of initial setting means for making initial settings according to the operational function of the processing device, and a factor identified by determining the contents of the factor display means is used to determine whether or not one of the plurality of initial setting means is selected. Select one initial setting method from
A method for resetting a processing device, comprising performing initial settings on the processing device according to an operating function.