JPS5981963A - Check system of ram for system control - Google Patents

Abstract

PURPOSE:To check whether an RAM changes in contents or not when a battery is run down by storing checking data in the RAM which is backed up by the battery and checking it when a power source is turned on. CONSTITUTION:The same checking data as data stored in an ROM3 is written in a specific area of the RAM2 previously. Then when the system is started, a CPU1 reads the checking data out of the specific area of the RAM2 backed up by a battery on power-on operation and also reads the checking data out of the ROM3 to compare both data with each other. If even one dissident pattern is found, it is judged that the contents of the RAM2 change such as the battery is run down; an error alarm device 4 sends out an alarm immediately and the system is shut down forcibly.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a control RAM for a facsimile system.
Regarding the check method.

In general, control information for facsimile systems, etc., which was set in ROM''! or a sequencer, is transferred to RAM, which can be stored in a battery pack when the system power is turned off, in order to improve the space factor and make it easier to change control contents. I am trying to store it.

Traditionally, system control RAM backed up by batteries
For facsimile systems using
M does not have any function to check if the battery runs out, so even if the contents of the RAM change and the system goes down due to the battery running out, it is not easy to determine the cause.

The present invention has been made with these points in mind. When starting up a system control RAM backed up by a battery and a facsimile system, etc., it is possible to check whether the contents of the RAM have changed due to a dead battery or the like. The present invention provides a system control RAM check method in which seven checks are performed.

Hereinafter, one embodiment of the present invention will be described in detail with reference to accompanying drawings.

FIG. 1 is a configuration example (not shown) for concrete implementation of the check method Z for system control according to the present invention. stored,
And RAM2 backed up by battery B and its RAM
ROM3 stores a program for checking the contents of M2 and specific data for checking it (a part of the system control program may be stored as necessary), and a checker for checking the contents of RAM2. As a result,
An error management device 4 is connected which issues two alarms when an error occurs.

With this configuration, in the system control RAM check method according to the present invention, first, the ROM 3
Under the control of the CPU 1 by the check program, the system is set to the check data one-input mode, and the same check data as that stored in ROM 3 is written to a specific area of RAM 2 in advance. I'll keep it. At that time, it is best to use a value selected by random numbers as the first turn of the check data, and use the pattern as an RA using an operational boat.
All you have to do is write to M2. RAM 2 in Figure 2
In the figure, DI indicates a storage area for a system control program, and D2 indicates a write area for check data. Here, as check data, a nomiturn l is placed at the address N of RAM2, a nodturn 2 is placed at the address (N-1), and a nomiturn 2 is placed at the address (N-1) of the RAM2.
-2) K pattern 3 is made up of a combination of four unit data in which pattern 4 is stored at address (N-3). It goes without saying that the number of units of check data and the 70 writing areas can be set arbitrarily. In addition, Figure 3 shows the check data in RA.
It shows the operational flow when writing to M2.

Next, when starting the system, R is set as a condition for the system power to be turned on, prior to starting the system control function according to the contents of RAM 2, which had been backed up by the battery while the system power was turned off.
Under the control of CPU 1 by the check program of OM 3, the check mode of system control 2 can be established. Then, the CPU reads check data from a specific area of RAM2 and outputs check data fi7+ from ROM3, and compares both data to find the check data pattern l. Check whether all items up to 4 match or not. If a discrepancy is recognized even during a turn, it is determined that the contents of rib M2 have changed due to a dead battery, etc., and an alarm command is immediately given to the error notification device 4 to issue an alarm to that effect (error display and/or alarm). (via sound) and forcibly bring down the system - also for checking data? When all the matches from turn 1 to turn 4'' are recognized, the CPU 1 starts the system control request.
Operation flow when performing 7 content checks of M2! It shows.

As described above, the system control RAM check method according to the present invention includes means for storing predetermined check data Z in a specific area of the system control RAM backed up by a battery when the system power is turned off, and the same method. A method for separately storing the check data in a fixed manner, and a means for comparing the check data stored in the system control RAM when the system is powered on with the check data fixedly stored. This system is designed to issue two error alarms when the data does not match, making it easy to check whether the contents have changed due to battery exhaustion in the system control RAM, which was previously backed up by a battery, when the system is started. It has the great advantage of being able to

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a block diagram showing a configuration example for concretely implementing the system control RAM changing method according to the present invention, and FIG. 2 is a block diagram showing an example of the data configuration of the system control RAM. Figure 3 is a diagram showing operation flow 7 when writing check data in the same embodiment, and Figures 1 and 4 are the same.
It is a figure showing operation flow 7 of M content check 1 Samurai. 1...CPU 2...RAM for system control
3...ROM4...Error t, Nyuki Iji equipment representative applicant's representative 1, 1 person Kiyoshi Torii Figure 1
8 Figure 2 Figure 3

Claims (1)

[Claims] System control R that backs up predetermined check data using a battery when the system power is turned off.
A means for storing the same check data in a specific area of the AM, a means for separately storing the same check data in a fixed manner, and a means for storing the check data in a fixed manner in the RAM K for system control when the system is powered on. This system control RAM check method takes a method of comparing the check data with the existing check data and generating an error alarm when the two data do not match.