JPH02138644A - Runaway detection method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Summary] Regarding a runaway detection method of a digital signal processor used in a high-efficiency encoding device, etc., a specific pattern is written in a storage means each time one process is performed, The purpose is to provide a runaway detection method that can reliably detect runaway by determining that runaway has occurred if the content does not correspond to the number of processing steps after a predetermined period of time has passed. An input/output means for providing an input/output interface, a sequence control means for controlling program execution, a first calculation means for specifying a program execution address and an input/output address for calculation data, and a second calculation means for performing data calculations. a calculation means, a first storage means for storing input/output data of each calculation data, and a second storage means for writing a specific pattern each time the second calculation means executes calculation processing;
A counting means for detecting runaway is provided, and each time the second calculation means performs one process, a specific pattern is written into the second storage means, the elapsed time is measured by the counting means, and a predetermined The counting means is cleared at the time interval of . At this time, if the pattern written in the second storage means does not correspond to the number of processing steps, it is determined that the runaway has occurred, thereby detecting the runaway.

[Industrial application field]

The present invention relates to a runaway detection method for a digital signal processor used in a high-efficiency encoding device or the like.

A digital signal processor is a high-efficiency encoder in a digital multiplexer used in digital communications.
For example, it is used in 32 kADPCM.

In such systems, as networks become more sophisticated and complex, system additions, changes, etc. are frequently performed. Moreover, due to the importance of the network, it is difficult to stop system operation, and it is necessary to insert and remove printed circuit board packages while the system is powered on. Also, a reliable runaway detection method is required.

[Prior Art] FIG. 4 is a block diagram illustrating a conventional example, and FIG. 5 is a diagram illustrating a flowchart of the conventional example.

The conventional example shown in FIG. 4 includes an input/output circuit 1a that interfaces with the outside, and a sequence controller 2 that controls program execution.
a, an address arithmetic logic unit (hereinafter referred to as ALU) 3a that specifies program execution addresses and input/output addresses of calculation data, an ALU 4a that performs data calculations, and a random access memory that stores each calculation data. 5a, and a counter 7a for detecting runaway.

In the above configuration, the counter 7a increments by 1 each time the ALU 4a performs processing and is reset at predetermined time intervals, so when the ALU 4a is operating normally, there is no carry from the counter 7a. does not occur and the digital signal processor is not reset.

When a runaway occurs, a carry is generated from the counter, so the occurrence of a carry is treated as an occurrence of a runaway, and the digital signal processor is reset.

FIG. 5 is an example of a conventional flowchart, and A
It is assumed that processing 1 and processing 2 are performed in the LU 4a, and the counter 7a is incremented by "1" between processing 1 and processing 2.

Here, when a predetermined time has elapsed, a reset signal is sent to the counter 7a.

The counter 7a is reset at predetermined time intervals, and if no carry occurs within this time, it is determined that the digital signal processor is operating normally.

[Problems to be Solved by the Invention] When an abnormal operation as shown by the dotted line occurs in the conventional example shown in FIG. Since the counter 7a counts normally and also resets the counter 7a normally after a predetermined time has elapsed, a carry does not occur and even if a malfunction loop occurs, runaway is not detected in this case.

The present invention writes a specific pattern into the storage means each time one process is performed, and if the content does not correspond to the number of steps in the process after a predetermined period of time, it is determined that the process has run out of control. The purpose is to provide a reliable runaway detection method.

7 is a second storage means for writing a specific pattern into the memory, and 7 is a counting means for detecting runaway. Providing such means is a means for solving this problem.

[Means to solve the problem]

FIG. 1 shows a block diagram illustrating the invention in detail.

In the block diagram of the principle of the present invention shown in FIG. 1, numeral 2 is an input/output means for providing a human output interface with the outside, numeral 2 is a sequence control means for controlling the execution of a program, numeral 3 is an execution address of the program, 4 is a first calculation means for specifying input/output addresses of calculation data; 4 is a second calculation means for calculating data; and 5 is a first storage means for storing input/output data of each calculation data. 6, each time the second arithmetic means 4 executes arithmetic processing, input data is input via the input/output means 1, and the sequence control means 2 controls the execution of the program. The calculation means 3 of 1 specifies the execution address of the program and the input/output address of the calculation data.

Various calculations are executed by the second calculation means 4, and the input/output data are stored in the first storage means 5.

At the same time, a specific pattern is written into the second storage means 6 each time one process is executed. Since the content corresponds to the above, it is possible to confirm that there is no out of control behavior.

〔Example〕

The gist of the present invention will be specifically explained below with reference to embodiments shown in FIGS. 2 and 3.

FIG. 2 is a block diagram illustrating the present invention in detail, and FIG. 3 is a diagram illustrating a flowchart of an embodiment of the present invention. Note that the same reference numerals indicate the same objects throughout the figures.

The embodiment of the present invention shown in FIG. 2 includes the input/output means 1, sequence control means 2, first calculation means 3, second calculation means 4, first storage means 5, and counting means explained in FIG. 7, an input/output circuit 1a, a sequence controller 2a, and an address ALU 3 having the same functions as explained in FIG.
This is an example configured of ALU 4a, random access memory 5a, counter 7a, and random access memo 'J6a as second storage means.

For example, as explained in the conventional example, when there are processes 1 and 2, the area A1 for runaway detection is stored in the random access memory 6a, corresponding to processes 1 and 2.
Assign A2.

Here, each time Process I and Process 2 are performed normally, AI,
Write a specific pattern on A2.

For example, if the pattern to be written is displayed in 8 bits, the upper 4 bits are set to 0101 representing process 1, and the lower 4 bits are set to 0 to 1 each time process 1 is executed.
'' is added and written to A2, the upper 4 bits are set to 1010 representing process 2, and the lower 4 bits are written by subtracting rlJ from the constant ``K'' each time process 2 is executed.

Here, we have assumed 8 bits, but the pattern written to AI and A2 is not limited to 8 bits (i.e., a pattern that has the lowest possible probability of appearing when a runaway occurs, and that can reliably confirm the execution of the process). All you have to do is set .

In this way, each time Process 1 and Process 2 are executed, a specific pattern is written to areas A1 and A2 for runaway detection, and when a predetermined period of time has elapsed, a specific pattern is written to areas A1 and A2 for runaway detection. It is determined whether the pattern that is displayed corresponds to the number of times of processing, and if they do not match, the program is restarted from the initialization part because the program has run out of control.

If they match, the process is being executed normally, so the contents of the runaway detection areas A1 and A2 are cleared and the process continues.

By adopting such a sequence, it becomes possible to detect runaway as shown in the conventional example.

〔Effect of the invention〕

According to the present invention as described above, runaway of a digital signal processor can be reliably detected, and a highly reliable system can be constructed.

[Brief explanation of the drawing]

FIG. 1 is a block diagram explaining the present invention in detail, FIG. 2 is a block diagram explaining the present invention in detail, FIG. 3 is a diagram explaining a flowchart of an embodiment of the present invention, and FIG. 4 is a conventional example. FIG. 5 is a block diagram explaining the conventional example, and FIG. 5 is a diagram explaining the flowchart of the conventional example. In the figure, 1 is an input/output means, la is an input/output circuit, 2 is a sequence control means, α is a sequence controller, 3 is a first calculation means, 3a is an address ALU, 4 is a second calculation means, and 4a is a ALU. 5 is a first storage means, 5a and 6a are random access memories, 6 is a second storage means, 7 is a counting means, and 7a is a counter. Figure 2: A detailed blog diagram explaining the flowchart of the embodiment of the present invention Figure 4: A block diagram explaining the conventional example

Claims (1)

[Claims] A runaway detection method for a digital signal processor used in a high-efficiency encoding device, etc., which includes an input/output means (1) for providing an input/output interface with the outside, and a sequence for controlling program execution. Control means (2)
, a first calculation means (3) for specifying a program execution address and an input/output address of calculation data, a second calculation means (4) for calculating data, and storing input/output data of each calculation data. a second storage means (6) into which a specific pattern is written each time the second calculation means (4) executes calculation processing; and a counting means for detecting runaway. (7), each time the second calculation means (4) performs one process, a specific pattern is written into the second storage means (6), and the counting means (7) writes a specific pattern into the second storage means (6); ) to measure the elapsed time and clear the counting means (7) at predetermined time intervals. At this time, if the pattern written in the second storage means (6) does not correspond to the number of processing steps, runaway detection is performed to ensure runaway detection. method.