Method and device for preventing internal storage data from losing

A memory data and memory technology, which is applied in data reset devices, protection of stored content to prevent loss, etc., can solve the problems of low reliability, memory data loss, and high cost, and achieve the effect of enhancing reliability and improving startup efficiency.

Active Publication Date: 2007-04-11
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0009] In order to solve the problems of possible loss of memory data, low reliability and high cost during CPU reset in the prior art, the present invention provides a method for preventing memory data loss, which specifically includes the following steps:

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  • Method and device for preventing internal storage data from losing
  • Method and device for preventing internal storage data from losing
  • Method and device for preventing internal storage data from losing

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Embodiment Construction

[0043] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the present invention.

[0044] The reset control circuit in the present invention can adopt the external watchdog reset in the prior art, and external signal (button) directly resets CPU reset pin, or CPU itself watchdog reset etc., also can adopt the software of system call Reset or software abnormal reset, etc.

[0045] The memory in the present invention is DRAM memory.

[0046] Referring to Fig. 3, the present invention provides a kind of method for preventing memory data loss, specifically comprises the following steps:

[0047] Step 101: when the CPU is reset, trigger an external interrupt of the CPU, and delay the reset time for a period of time, when the CPU detects that an interrupt signal is generated, call the interrupt service program to make the memory enter the self-refresh state;

[0048] The delay tim...

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Abstract

This invention provides a method and device to avoid the loss of memory data, belonging to the field of processor, to solve such existing problems as lost memory data, low reliability and high cost during the period of CPU release, including the following steps: when CPU is released, delaying the release time and making the memory enter auto-refreshing state, ending delay and triggering CPU real release. The invention also provides a device, including delay module, auto-refreshing configuration module and release module, and memory data are not lost, not only enhancing the reliability of running software, but also improving the starting efficiency.

Description

technical field [0001] The invention relates to the field of processors, in particular to a method and device for preventing memory data from being lost. Background technique [0002] Usually DRAM (Dynamic Random Access Memory, dynamic random access memory) (including but not limited to DDR SDRAM (Double Data Rate Synchronous Dynamic Random Access Memory, double speed synchronous dynamic random access memory)) memory data in CPU (Central Processing Unit, central Processor) can only be reserved for a limited period of time during reset, and the time varies according to different memory chips and different PCB (Printed Circuit Board, printed circuit board) designs. The time that the DRAM chip itself can guarantee is milliseconds , if the restart time of the central processing unit after reset is too long, it may cause the memory data to become a random value after the central processing unit is restarted, which will cause errors in reading data, affect the normal operation of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F12/16G06F1/24
Inventor 史新明陈昀唐鲲
Owner HUAWEI TECH CO LTD
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