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Backup Memory control unit for reducing current consumption

A backup control and memory technology, applied in the direction of static memory, memory system, digital memory information, etc., can solve the problem of increasing current consumption

Inactive Publication Date: 2008-08-20
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is because in such a memory backup method, if the operation mode of the DRAM is not set to the self-refresh mode, and the backup power is supplied without initial settings, there is a problem of unnecessary increase in the current consumption of the above-mentioned DRAM.

Method used

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  • Backup Memory control unit for reducing current consumption
  • Backup Memory control unit for reducing current consumption
  • Backup Memory control unit for reducing current consumption

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0025] An embodiment of the present invention will be described below.

[0026] Embodiment 1

[0027] In this embodiment, as the memory backup control device, a volatile memory suitable for a vehicle control circuit that controls various parts of a vehicle, especially a memory backup for a synchronous DRAM (hereinafter referred to as "SDRAM"), is described as the memory backup control device. control device.

[0028] In the memory backup control device according to the first embodiment, the SDRAM operates in three states: an unset mode, a normal operation mode, and a self-refresh mode. The so-called unset mode is the mode state before initialization, the so-called normal operation mode is the mode setting mode in order to make the control program read from the CD-ROM by the CD-ROM drive device can be written into the SDRAM normally, and the so-called auto The refresh mode is a mode state in which the SDRAM performs a self-refresh operation. mahogany

[0029] In addition, t...

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Abstract

The invention obtained a memory backup controller which is reducible in current consumption when a memory is not in operation by providing a non-setting mode for the memory and then supplying no current in the non-setting mode. An SDRAM 6 is provided with the non-setting mode and in the non-setting mode wherein the SDRAM 6 is not in operation, the power supply from a backup power source 4 is stopped to suppress an increase in current consumption by the power supply from the backup power source 4 in the non-setting mode of the SDRAM 6; and a function by a backup microcomputer is actualized with hardware circuit constitution without depending upon the backup microcomputer.

Description

technical field [0001] The present invention relates to a memory backup control device suitable for use in, for example, SDRAM backup. Background technique [0002] As the existing memory backup control device, in the system using DRAM as the backup memory disclosed in Japanese Patent Laying-Open No. 11-53271, the working state of the above-mentioned DRAM is managed by a CPU normally powered on, such as a backup microcomputer, and the backup memory is used. A microcomputer performs various controls. [0003] The memory backup control device of the existing system that uses DRAM as the backup memory is structured as described above, so in addition to the main CPU, a backup microcomputer must be provided, and it may increase the risk of loss of control due to program errors. When the power is turned on for the first time, since the DRAM is in the self-refresh mode, it must be changed to the standby state after the main power is turned on and the self-refresh mode is in the se...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F1/32G06F1/26G06F12/00G06F12/16G11C7/20G11C7/22G11C7/24G11C11/406G11C11/4072G11C11/4078
CPCG11C7/24G11C7/20G11C2207/2227G11C11/406G11C11/4072G11C7/22G11C11/4078
Inventor 横山主税日笠恭司大塚和宜
Owner MITSUBISHI ELECTRIC CORP