JPS58205994A - Non-volatile memory system - Google Patents

Abstract

PURPOSE:To cope with a long time power failure with small battery capacity, by transferring information to a non-volatile memory from a dynamic RAM with the energy of a battery for backup when power fails, and cutting off automatically the battery. CONSTITUTION:When power fails, a battery 2 for backup is connected through a power failure controller 5, and information in a dynamic RAM1 is transferred to a non-volatile memory such as a magnetic tape 4, etc. After the completion of the transferring, the controller automatically cuts off the battery 2 to keep the nonvolatility of the information. Due to this constitution, a nonvolatile memory system which can well cope with a long time power failure with a small battery capacity can be realized.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to volatile memory systems.

A conventional nonvolatile memory system is shown in FIG.

In the figure, l is dynamic RA, which is volatile memory.
M (hereinafter referred to as DRAM 1 and 2) and 2 are DRAMs during power outage.
Backup battery to back up MI, 3 is DR
The operation of the device, which is the CPU bus that transmits AMI data, will be explained with reference to FIG. Writing and reading of data is performed. ) Since DRAM1 is volatile, all of its stored data will be destroyed in the event of a power outage3, so at time T
Normally, at 1, when the power supply is interrupted and the 4 voltage begins to drop, current is supplied from the backup battery 2 to I) RAMI. Therefore, the data in DRAMI is not destroyed. However, if the power outage is long, for example, as shown at time T in FIG. 2, the capacity of the backup battery 2 runs out and its voltage drops, causing the DRAM1
memory data will be destroyed. In this way, in conventional non-volatile memory systems, the power outage time c is longer than the battery capacity.
However, there was a drawback that the non-volatility of the memory contents could not be maintained.

The present invention has been made in order to eliminate the above-mentioned drawbacks of the conventional technology.In the event of a power outage, data is transferred from the DRAM to the non-volatile memory using battery energy, and the battery is automatically disconnected after the transfer is completed. The purpose of the present invention is to provide a nonvolatile memory system that can maintain nonvolatility even after a long power outage even with a small battery capacity.

The real sister 1+lJ of the present invention will be explained below with reference to the drawings.

Figure 83.4 shows the first embodiment of the present invention, 4 is a magnetic tape which is a non-volatile memory, and the magnetic tape 4 is used to transfer and store DRA and M1 data at the same time. 6 is a normal power supply of AClooV, 7 is a rectifier circuit that rectifies the output of the normal power supply 6, 8 is a voltage regulator that adjusts the output voltage of the rectifier circuit 7, and voltage regulator 8 The output is electric tO
It is applied to the DRAMI, magnetic tape 4 and power failure controller 5 via the R diode 9. lo is a comparator that compares the output of the voltage regulator 8 with a predetermined voltage;
Reference numeral 11 denotes a relay, one end of which is connected to the backup battery 2, and the other end connected to the DRAMI, magnetic tape 4, and power outage controller 5 via a voltage OR diode 12, and the coil llb of the relay is It is connected between the backup battery 2 and the power outage controller 5. .

Next, the operation of the upper ml device will be explained. First, during normal energization, a voltage is output from the voltage regulator 8, and this voltage is supplied to the DRAMI, the magnetic tape 4, and the power outage controller 5. Next, when the normal power supply 6 experiences a power outage, the output voltage from the voltage regulator 8 decreases. The comparator 10 detects that the output of the voltage regulator 8 has become below a predetermined value, and sends the detection signal to the power outage controller 5 6, whereby the power outage controller 5
't'tr is sensed, and the contact 11a is turned on by causing a current to flow through the relay coil llb. For this reason, D
RAM I, magnetic tape 4 and power outage controller 5
Power is supplied from the batho-cup power supply 2.

Further, the data written in DiζAMI is transferred to the magnetic tape 4 according to a command from the power outage controller 5. This transfer is performed by using the energy of the backup pond 2. Ru. When the transfer is completed, relay coil 11 b f flows 6 by the operation of power outage controller a.
4Mc is cut off, and the contact 11a is turned off. For this reason, the backup 'Yakame 2 supply' (is sent to the Pure Land), but since it is stored in the magnetic disk 4, which is a non-volatile memory, it will not be destroyed. Backup 1 is necessary because the power supply to Yagara 2 is only for a short period of time after a power outage until the data transfer is completed.
fJ i Pond 2 may be one with a small valley;
1J Even if there is a power outage, there will be no problem with I'J.

Once the power outage ends, the power outage controller 5 is activated and the data on the magnetic tape 4 is again transferred to L)fζAΔ11.

'a'y ”a, b + threshold shows a second embodiment of the present invention, in which a bubble memory 13 is used as a non-volatile memory, and the operation and effect are the same as those of the first embodiment.
This is the same as example m.

7 and 8 show a third embodiment of the present invention, in which a floppy disk 14 is used as the nonvolatile memory, and the operation and effects are similar to those of the first embodiment.

In addition, the backup 'Kameike 2' is the primary 'Shimaike Rurui or Hikari.
Any rechargeable secondary battery with an added circuit may be used, but it goes without saying that using a secondary battery will extend the life of a low-voltage battery.

As described above, in the case of a power outage, the backup battery is used to supply power to the RAM from the backup battery.In the case of a power outage, dynamic RAM is The data is saved in a non-volatile memory and the power supply to the backup battery is turned off after being saved, and non-volatile memory does not destroy the data even if the power supply is interrupted. No destruction occurs. Moreover, the supply from the backup battery is only for a short period of time from the time a power outage occurs until the data has been saved.
Even if the basket pond delta is small or the W tunnel is long, no problem will occur.

[Brief explanation of drawings]

Figures 1 and 2 are a configuration diagram of a conventional non-volatile memory system and a time chart at Wt, respectively. Figure 4 shows the ↑44 diagram of the non-volatile memory system that corresponds to the first imprint of the present invention, and the connection diagrams 5 and 6, respectively.
Figures 7 and 8 respectively show a second embodiment of the present invention; A; a configuration diagram of a volatile memory system and a power supply connection diagram; Figures 7 and 8 respectively show a non-volatile A configuration diagram of the sexual memory system and a connection diagram of the Yagishi relationship. 1... Tainamitsuku KAΔ1 (DRA~1), 2...
・Backup Oeike, 3...C1'U bus, 4.
...magnetic chi/, 5... power outage controller, 6...
Normal Turtle, 11...S L/-113...Bubble Memo IJ, 14...Flotshitis, Ri. Note that the same reference numerals in the figures indicate the same or corresponding parts. Agent Shin Kuzuno −

Claims (4)

[Claims] (1) In a non-volatile memory system equipped with a dynamic RAM, in which power is supplied to the dynamic RAM from a backup battery in the event of a power outage, data stored in the dynamic RAM is transferred to the non-volatile memory using the energy of the backup battery in the event of a power outage. A non-volatile memory system characterized in that a backup battery is separated from a dynamic RAM and a non-volatile memory after the transfer is completed. (2) The non-volatile memory system according to claim 1, wherein the non-volatile memory is constructed from a magnetic tape. (3) The nonvolatile memory system according to claim 1, wherein the nonvolatile memory is constituted by a bubble memory. (4) The non-volatile memory system according to claim 1, wherein the non-volatile memory is stored on a floppy disk.