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Intelligent watchdog circuit system of olt equipment

A circuit system and watchdog technology, which is applied in the field of watchdog circuits, can solve the problems of not fully satisfying the reset and watchdog functions of OLT devices, and lack of GPIO resources.

Active Publication Date: 2021-05-11
广州芯德通信科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The 706 chip has high reliability in this way, but it is limited by the general rules of the industry. The reset is triggered after 1.6S after the dog is not fed, and there is only one 7th pin for the reset.
The OLT project uses too few GPIO resources of the CPU, and the GPIO cannot guarantee the level conversion action within 1.6s during the upgrade, because the OLT equipment is complex, and the reset timing required by the peripheral IC devices is different, so use The traditional 706 cannot fully meet the reset and watchdog functions of OLT equipment

Method used

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  • Intelligent watchdog circuit system of olt equipment

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Embodiment Construction

[0030] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangements of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.

[0031] At the same time, it should be understood that, for the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship.

[0032] The following description of at least one exemplary embodiment is merely illustrative in nature and in no way taken as limiting the invention, its application or uses.

[0033] Techniques, methods and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques, methods and devices should be considered part of the descript...

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Abstract

The embodiment of the present invention discloses an intelligent watchdog circuit system of OLT equipment, comprising: a CPU circuit, a CPLD circuit and a reset circuit; the CPU circuit is connected to the CPLD circuit through a serial interface line; the reset circuit is connected to On described CPLD circuit; CPLD circuit realizes watchdog function and reset function; Described CPU circuit adjusts reset time, reset sequence of reset circuit by CPLD circuit, when abnormality occurs in CPU circuit, the watchdog of described CPLD circuit The circuit resets the whole board to ensure the system restarts. The invention is connected to the CPU circuit through a serial interface, and determines whether to reset or trigger the watchdog by analyzing the instructions sent by the CPU circuit, and realizes precise control of time by counting the external clock.

Description

technical field [0001] The invention relates to the technical field of watchdog circuits, in particular to an intelligent watchdog circuit system of an OLT device. Background technique [0002] Watchdogs currently used in electronic equipment are divided into hardware watchdogs and software watchdogs. Using a special watchdog chip, the CPU controls the dog feed signal and the watchdog enable signal to control the watchdog chip. This method is called a hardware watchdog; using the watchdog circuit integrated inside the CPU, this is called Watchdog for software. Because the software watchdog is affected by the CPU itself, many devices that have high requirements for the watchdog do not use this method. [0003] The hardware watchdog generally uses the 706 chip. The 6th pin of the 706 chip is the dog feed signal input. When there is no dog feed within 1.6S, the 8th pin is triggered to become low level, because the 1st pin and the 8th pin Pin connection, when the 1st pin dete...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F11/07
CPCG06F11/0757
Inventor 徐培根饶东盛
Owner 广州芯德通信科技股份有限公司