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Real-time adjustable reset method and device for watch dog

A reset method and a reset device technology, applied in the field of electrical communication, can solve the problems of changing the waiting time of the watchdog, unable to realize real-time, etc., and achieve the effects of real-time adjustable dog feeding time, low cost and high reliability

Inactive Publication Date: 2004-06-23
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this circuit solves the requirement that the watchdog timer should be set for a long time during the power-on bootstrap process, it cannot realize the function of changing the waiting time of the watchdog in real time.

Method used

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  • Real-time adjustable reset method and device for watch dog
  • Real-time adjustable reset method and device for watch dog
  • Real-time adjustable reset method and device for watch dog

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Embodiment Construction

[0021] Below according to accompanying drawing and embodiment the present invention will be described in further detail:

[0022] according to figure 1 , figure 2 and image 3 ,like figure 1 and figure 2 Shown, the present invention comprises watchdog integrated block MAX706T and programmable counter, and described programmable counter is connected with an external clock, and external clock adopts chip ICM7555 or other clock sources on the system single board, and the oscillation frequency of this external clock determines Reset pulse width, the reset pulse width is about 12ms. The programmable counter is composed of redundant complex programmable logic device CPLD pins and macro cells in the system. Complex programmable logic device CPLD can be used, such as EPM7128 or field programmable gate array FPGA chip, CPU generates two-bit time setting signals SEL0, SEL1 input programmable counter, watchdog integrated block MAX706T outputs reset signal RESET_ and overflow signal...

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Abstract

The present invention relates to telecomm technology and is especially the real-time adjustable reset method and device for watch dog. The device includes watch dog IC block and programmable counter connected to an external clock. The CPU generates time setting signal fed to the programmable counter, the watch dog IC block output reset signal and overflow signal to the programmable counter, the programmable counter generates relevant reset signal to the CPU, the external clock determines the reset pulse width by its vibration frequency, the CPU produces conditional time set signal, and the time setting signal determines the counted value to regulate the waiting time for the watch dog IC block. The present invention has simple and practical circuit, high reliability, low cost and thus wide application range.

Description

technical field [0001] The invention relates to electric communication technology, in particular to a watchdog real-time adjustable reset method and device. Background technique [0002] At present, microprocessors such as POWER PCs and network processors are widely used in various communication devices. This kind of processors and the previous microprocessors represented by single-chip microcomputers not only have great changes in function and processing capacity, but also have great changes on the Internet. There are also significant changes in electrical bootstrapping. [0003] There is no difference in the requirements for the reset monitoring chip of the single chip microcomputer during power-on initialization and normal operation, and can be handled uniformly. However, due to the increasingly complex and perfect functions of POWER PCs and network processors, the power-on bootstrap time is getting longer and longer, which creates a requirement for the watchdog timer ti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F1/24G06F11/30
Inventor 李卫东唐荣道江琥
Owner ZTE CORP