JPS5837895A - Driving method of magnetic bubble memory device - Google Patents

Abstract

PURPOSE:To synchronize the conduction of a pulse current to a bubble stretcher with the transfer of bubble, by having the start and stop so that the magnetic bubble resides at the position away from a detected bit position by an even number of bits. CONSTITUTION:The bubbles exist at every other position along a transfer pattern 21 of a bubble device having an odd-even constitution. The repeating cycle is produced at every two periods of transfer for the pulse current flowing to a bubble stretcher 24 which stretches and erases the bubble. For the start and stop of a magnetic memory device, the device is stopped when the bubble reaches the position aparting by an even number of bits from the bit position detected by a cusp 26 of the pattern 21. As a result, the synchronization is obtained between the driving of the bubble and the time when the pulse current of the stretcher 24 conducts. This prevents a malfunction by which the bubble passes the position of detection and cannot be detected.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for driving a magnetic Papulume cage device O in which detection of magnetic bubbles is synchronized with transfer bubbles.

The circuit configuration of the magnetic bubble memory uses the major/minor loop method, and the odd/even configuration (hereinafter referred to as "bubble"), which processes magnetic bubble information at high speed by dividing it into odd and even columns.
Below, 0dd-Even) is used for towing.

The first wJ is a block diagram of a device having an 0dd-default@a configuration, and by changing the configuration, the write and read speeds of Shiva pull information are increased.

That is, the pulp information is divided into odd number columns (Odd) and even number columns (Bma・m), and each of these is processed in the device by an odd number block that handles the bubble information of the odd number columns and an even number block that handles the even number columns. Each block has a bubble generator and a detector.

Now, referring to Figure 1, if the left block I is set to an odd number, and the right block is set to an even number, the electrical signals are converted into puzzle signals in generators 1 and 2. The bubble signal with the same configuration propagates through the major 2 in 3 and 4 of each block, and the! of each block! Align with the writing position 7.8 opposite the inaloop group 5.6.

The bit numbers of the transfer paths that make up major lines 3 and 4 are made so that the odd numbered blocks l and the even numbered blocks l are different by one bit, and each minor loop group S and 6 are made with each major twin 3.4. Since the bubble information is arranged every other bit of
When lined up at opposing position 7, even numbered columns of bubble information are lined up at opposing position 8 of each minor loop processor of the even block IO, and the puzzle signals at major fins /3 and 4 are written by the action of transfer gate 90. The write positions 1G and IIK are transferred and circulated within the shimina loop 5.6 by the driving magnetic field.

Next, the reading method is to read out the information you want to read (when the pull information is transferred to the read position 14.15 of the minor loop group opposite the read measure line 12.13, the F transfer gate 16 acts on the measure line 12.1).
Transferred to 3 and thereafter shrunk line 12.1 due to the driving magnetic field.
3 and detected by detectors 17 and 18.

Even in reading major line 12.13, the number of constituent bits is 1 bit different between odd block I and even block 1, so the bubble information of odd block I and the even block I/(pull information are It is likely to be detected alternately.
As a result, two electrical signals appear next to each other. .

The present invention relates to the synchronization of the stretch current for bubble detection and the drive magnetic field in the detector of the paplume cage device having the 0dd-11ve+a configuration.

In other words, the ml! QC) Bubble information consisting of odd columns is transferred to the readout major twin 12, and bubble information consisting of even columns is transferred to the readout major twin 13 every l bit.

In the following, a case will be explained in which the bubble is formed by ion implantation and a large concatenated transfer pattern, and bubble detection is performed by using a magneto-resistance element to detect the bubble.

Figure 2 shows a state in which signals consisting of odd or even columns are transferred along the readout measure twin and detected by the detector. In this case, the bubble signal is assumed to consist of 111 continuous signals. According to the rotation of the driving magnetic field shown in FIG.
They exist bit by bit apart.

In and \, the detector consists of a bubble stretcher 24 which is a hairpin-shaped conductor pattern and a magnetoresistive element 25, and the curved part inside the tip of the bubble stretcher 24 is patterned with a connected transfer pattern 210 and a cusp 26 in the center. Furthermore, a magnetoresistive element 25 is provided in the gap between the conductor patterns constituting the bubble stretcher 24, with conductive intersections insulated by a silicon oxide (Sick) layer or the like.

Note that a region 27 surrounded by parallel broken lines is a non-ion implanted region formed similarly to the connected transfer pattern 21.

A method for detecting and erasing puzzles is to apply a pulse to the bubble stretcher 24 in the direction that weakens the bias magnetic field inside the hairpin at the phase where the bubble is transferred and reaches the cusp position 26 of the articulated transfer pattern 21 with the bubble stretcher 24. Bubble 22 at cusp location 26 when current is applied
The resistance value of the magnetoresistive element 25 changes due to the magnetic field from the bubble stretched on the inner surface of the bubble stretcher 24, and fins are detected, and then bubble stretch f?
When a pulse current is applied to the layer 24 in the opposite direction, erasing is performed.

Now, the puzzle is transferred following the rotation of the driving magnetic field from about 1350 to 112250 as shown in Figure 3, and is transferred from about 2250 to 1
The movement range of 2700 up to 350 remains at the cusp position, and bubbles must be detected and eliminated during this period.

Detection and erasure performed during the IB transition of this driving magnetic field poses no problem when the driving frequency is low, but becomes more difficult as the driving frequency increases.

For example, in Fig. 2, the effective length of the magnetoresistive element is 1001
If m and pub hO expansion speed Vs = 60 m/sec, it takes L7 μsec just to expand the puzzle at 100 voices and 1111 Kt.

When the driving frequency is 1001CEz with and -, the time the bubble stays at the cusp position of the connected transfer pattern is 7.5
While it takes 71 seconds, in the case of 300 ICHg, it is short at Btss seconds. If the puzzle is expanded, detected, and erased during this time, it will be difficult to expand.

As a solution to this problem, the inventors focused on the fact that in the case of the 0dd-Evan configuration O, the bubble signals transferred along the concatenated transfer pattern are arranged every other bubble signal, and the bubble signals are transmitted at a rate of once every 2 bits of transfer. proposed a detection method in which a pulsed current is applied to a stretch conductor.

In this method, the expansion, detection, and erasure of the puzzle need only be performed nine times in two periods of transfer, making it possible to cope with an increase in the driving frequency.

However, when bubble detection is performed every two piF cycles of transfer in this way, it is necessary to synchronize the application of pulse current to the bubble stretcher and bubble transfer.

The purpose of the present invention is to synchronize the two, and as a method for this purpose, the bubble memory device is started or stopped so that the bubble exists at a position that is an even number of bits away from the detected bit position.

The present invention will be explained below with reference to the drawings.

In a bubble memory device with an 0dd-even configuration, data is transferred along a concatenated transfer pattern 21. On the other hand, the pulse current flowing through the puzzle stretcher 24 for expanding and erasing bubbles is repeated once every two transfer cycles. It is. If the bubble signal array consists of 111 continuous signals, it is a necessary condition for puzzle detection that the bubble stretcher 24 is energized with low current when the signal bubbles are at positions 22 and 23 in FIG. In this case, if the signal bubble is at positions 28 and 29, and the bubble stretcher 24 is energized, the bubble will not be detected and the signal bubble will be at positions 28 and 29 when power is applied to the next bubble (A) to the stretcher. The bubble moves to the 3G and 2s position and no detection occurs.

As a method to prevent such malfunctions, the present invention provides that when starting or stopping a device, the detection bit position of the concatenated transfer pattern is always set at a position an even number of bits away from the device when a busy bubble arrives. Yonishi Pub, 4-
The main idea is to synchronize the O drive and the pulse current energization of the bubble stretcher.

Although the present embodiment has been described with reference to a case where detection is performed once every two transfer cycles, the present invention can be implemented similarly in a method where detection is performed once every two or more cycles.

[Brief explanation of drawings]

Figure 1 is a circuit diagram of a bubble memory device with an 0dd-even configuration, Figure 2 is an explanatory diagram of the operation of a magnetic puzzle detector provided in a connected transfer pattern, and Figure 3 is a rotating magnetic field method and puzzle. It is a relationship diagram with transfer. In the figure, 21 is a continuous transfer pattern, 24 bubble stretcher, 25 is a magnetoresistive element, 26ki force sp position, 22.2
3.2g, 29.30 is a magnetic bubble. 1st 2nd prisoner boat 3rd figure 80

Claims (1)

[Claims] The detector is composed of a bubble stretcher and a magnetoresistive element, and the magnetic bubble 0 detection and erasure are performed every two cycles of bubble transfer. A method for driving a magnetic puzzle tun resort, characterized in that starting and stopping are synchronized so that magnetic puzzle information exists at nine separate positions.