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PLD for implementing watchdog function

A technology of programming logic and watchdog, which is applied in electrical digital data processing, instruments, calculations, etc., can solve problems such as crashes, voltage instability, program runaway, etc., and achieve the effect of protecting the system

Inactive Publication Date: 2009-04-01
BEIJING JIAXUN FEIHONG ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The reliability of electronic products has always been a very important issue, especially in embedded instruments and meters used in industrial fields, often due to voltage instability, arc interference, etc.

Method used

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  • PLD for implementing watchdog function
  • PLD for implementing watchdog function

Examples

Experimental program
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Effect test

Embodiment Construction

[0015] The preferred embodiments will be described in detail below in conjunction with the accompanying drawings. It should be emphasized that the following description is only exemplary and not intended to limit the scope of the invention and its application.

[0016] The design concept of the present invention is to realize the function of watchdog through the programmable logic circuit without adding additional auxiliary circuits, and "feed the dog", that is, the time interval of the input signal to be tested is adjustable. When the system under test is running normally, it will output a fixed pulse to the input pin of the circuit of the present invention, that is, "feed the dog" to the watchdog circuit at regular intervals; The test system will lose the function of "feeding the dog". At this time, the watchdog will automatically generate a reset signal and restart the system.

[0017] figure 1 It is a schematic diagram of a programmable logic circuit realizing the watchd...

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Abstract

The invention discloses a programmable logic circuit realizing the function of a house dog in the technical field of SCM circuit design. The technical proposal is as follows: the circuit comprises a first flip-latch 101, a second flip-latch 102, a third flip-latch 103, an AND gate 104, a counter 105 and an adder 106; when a system to be detected runs normally, the system can output a fixed pulse signal to the D end of the first flip-latch 101, thus feeding the circuit of the house dog in definite time; once the system to be detected abnormally runs or halts or is wrong in other aspects, the system to be detected loses the function for feeding the dog; then the house dog can automatically generate an offset signal and lead the system to re-start running. The programmable logic circuit realizes the function of automatic resume under the situation of unattended operation when the system is abnormal or halted through adding a simple circuit, thereby achieving the goal of protecting the system.

Description

technical field [0001] The invention belongs to the technical field of single-chip circuit design, in particular to a programmable logic circuit for realizing the watchdog function. Background technique [0002] The reliability of electronic products has always been a very important issue, especially in embedded instruments and meters used in industrial fields, often due to voltage instability, arc interference and other reasons, programs run away and crashes. In order to ensure that the system can automatically return to normal after being disturbed, a watchdog circuit is added to the general embedded circuit so that it can recover as soon as possible when an abnormality is detected, which is more important for unattended systems . Contents of the invention [0003] The purpose of the present invention is to provide a programmable logic circuit that realizes the watchdog function. Through programming, the detection signal is controlled according to the change of the sign...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F11/00
Inventor 李政
Owner BEIJING JIAXUN FEIHONG ELECTRIC CO LTD
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