SU1298753A1 - Device for checking execution time of program - Google Patents

Abstract

The invention relates to computing and can be used in microprocessor computing and control systems. The purpose of the invention is to simplify the device. The device contains two counters of 1, 2 pulses, a generator of 3 clock pulses, trigger A, D-trigger 5, the element OR 6 and the element 7 of the delay. This invention allows to protect the performance of object management functions from uncontrolled states of a digital computer, including looping and shutdowns, and to automate the restarting of a digital computer. 4 il. 11 (L

Description

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The invention relates to computing technology and can be used in microprocessor-based measuring and control systems.

The purpose of the invention is to simplify the device.

FIG. 1 is a functional diagram of the device for monitoring the program execution time} in FIG. 2 is a time diagram of the operation of the device with a normal sequence of program execution; on fig.Z - the same, in the absence of control pulses on the tires of the output ports; figure 4 is the same, when the microprocessor system loops on the commands issuing control pulses

The device contains counters 1 and pulses, a generator of 3 clock pulses, RS-flip-flop 4, D-flip-flop 5, element OR 6, delay element 7, output 8 of flip-flop 4, start 9 of D-flip-flop 5, input 10 of the maximum execution time code program, input 11 of the maximum program execution time code, input 12 of the program operation flag, output 13 of the program operation failure, pulse generator output 14, transfer output 15 of the first counter, transfer output 16 of the second counter, output 17 of delay element 7,

In instrumentation designed to continuously monitor the parameters of the technological process, the program for measuring these parameters is usually cyclically repeated. For example, when measuring moisture, ash, etc. bulk materials using radioisotope methods The input information of a microprocessor system is the frequency of occurrence of pulses from radiation detectors, presented in a digital code.

The digital code is processed in the microprocessor system according to a specific program, with the output information of the system being

etc. in each new measurement cycle, the program is executed with new inputs. The time taken to execute the measurement program in such microprocessor systems is in a certain range, limited by the maximum and minimum time. This is about

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This is because the time for executing program instructions such as multiplication, division is determined by the magnitude of the values involved in these actions of the operands. For example, with larger values of factors, the time to perform multiplication is longer than with smaller ones. By specifying permissible minimum and maximum input values, you can always determine the minimum and maximum times for executing a certain program with the necessary accuracy.

The device works as follows

At the initial moment, a general reset or a power-up (not shown) signals a general system reset, and it proceeds to the execution of the corresponding program. The microprocessor system forms a control pulse at the input 12. Program instructions that form a given pulse can, for example, be placed at the very end of the program. When executing this program cyclically, a test pulse will appear periodically at the input 12. Codes of maximally Po and minimum program execution time, respectively, to input 10 and input 11 can come, for example, from special setters of codes, or from a microprocessor system1. During normal program execution, code recording occurs before the transfer pulse from output 15 of counter 1 (FIG. 2) appears. The transfer pulse from counter 2 appears at output 16 after time t, which is slightly less than the minimum time required to execute appropriate program. This transfer impulse sets the trigger to one state, hence the zero state at the inverse output of the trigger. When a control pulse arrives at the clock input of the D-flip-flop, the D-flip-flop outputs do not change, therefore, at the output 13 of the OR 6 element, there is no pulse indicating that the program has failed,

In the case of a program crash caused by stopping or looping in a program section that does not include commands that form a control pulse at input 12, the control im312

a pulse appears, i.e. in this case, the program does not overwrite the maximum program execution time in counter 1, therefore, after a time tJ equal to the maximum program execution time, a transfer impulse appears at the output 15 of counter 1. This pulse through the element OR 6 goes to output 13, signaling a failure. The same impulse ensures the restarting of the microprocessor system (Fig. 3).

In the event that a program loops in any part of the program that includes commands to send a control pulse, then the time between occurrences of the control pulse will be less than the minimum program execution time. Consequently, the transfer pulse from counter 2 has not yet reached output 16, when a control pulse arrives at the clock input of the D-flip-flop. Since the inverse output of the trigger is in the unit state, when the control pulse arrives, the D-flip-flop is set. After a time equal to the delay time, the D-flip-flop is reset using the control pulse held by the delay element 7. Thus, at the output 9 a pulse is formed, which is fed to the input of the element OR 6 and further to the output 13 of the device. In this case, the delay element 7 serves to form the required pulse duration at the output 13 (FIG. 4),

It should be noted that at the initial moment of time when the system is started, the codes in counters 1 and 2 are set randomly. If this code in counter 1 corresponds to a time that is less than the maximum program execution time, then during program execution at the transfer output counter 1 may cause a carry signal. As a result, the microprocessor system will again be reset, and counter 1 will be reset to zero (as the transfer signal is received). In the next cycle, the program will pass to the end, and the control pulse will record the necessary codes in counters 1 and 2, B in counter 2 at the initial moment of time setting34

If the code corresponds to the time that is longer than the maximum program execution time, the transfer signal does not work at the transfer output of the counter and the trigger 4 will not be reset. Therefore, when the control pulse appears, the output 13 of the device is generated and the system is restarted. and the necessary codes are written in. counters 1 and 2, the program starts to run from the beginning, but the corresponding codes will already be written to counters 1 and 2.

Thus, a device for monitoring the progress of a program in microprobe. The system allows the system to identify a software failure in the system caused by stopping or looping the program and eliminate it by restarting the system.

Claims (1)

Invention Formula A device for monitoring the program execution time, containing a clock pulse generator, the first and second pulse counters, the RS flip-flop, the OR element, the information input of the first pulse counter being the input of the code setting for the maximum running time of the device program, the clock generator output the pulses are connected to the counting input of the first pulse counter, the output of the OR element is the output of the operation of the device program, which is such that, for the sake of simplicity, a delay element is inserted into the device and D- a trigger, and the input of the sign of the device program operation is connected to the clock input of the D-flip-flop and through the delay element to the inputs of the initial setup of the RS-flip-flop, the D-flip-flop and inputs of the first and second pulse counters. and a single RS-trigger input, the inverse output of which is connected to the information input of the D-flip-flop, the output of the O-flip-flop is connected to the second input of the OR element, the input of setting the code for the minimum program operation time of the device nen to an information input of the second pulse counter. Phi22 Fig.Z Editor E. Papp Compiled by I.Safronova Tehred, M. Khodanich Proofreader S. Shekmar Order 890/51 Circulation 673 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production printing company, Uzhgorod, st. Project, 4