JPS60182590A - Magnetic bubble drive system - Google Patents

Abstract

PURPOSE:To control such as bubble generation and transfer in a transfer gate and to simplify constitution by making an enable signal to be applied to plural constant current circuits from a controller common and delaying the period of a control signal. CONSTITUTION:When magnetic bubble memory elements M1 and M2 are simultaneously driven in parallel, a common signal from a controller is supplied to respective input terminals of constant current circuits 61 and 62, and control signals B1 and B2 are independently supplied and are little delayed in period each other. When a generator enable signal is inputted to the circuits 61 and 62, the enable signal is outputted only from the circuit 61 in accordance with the signal B1, and a bubble is generated in the element M1. Moreover, when a swap enable signal is inputted to the circuits 61 and 62, outputs of the circuits 61 and 62 are brought into the swap enable condition in accordance with the signals B1 and B2, transfer gates in the elements M1 and M2 operate, and the transfer to a minor loop is executed.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention generates and transfers magnetic bubbles (hereinafter abbreviated as "L-bubbles") in a bubble wafer, which is a magnetic medium, thereby enabling continuous publication of information. This invention relates to a magnetic bubble drive method for storing data.

[Prior art and its problems]

FIG. 1 is a diagram showing a major/minor loop configuration of a known magnetic bubble storage element, and FIG. 2 is a block diagram of a conventional magnetic bubble driving method for driving this magnetic bubble storage element. M is one magnetic bubble memory element, and a transfer pattern as shown in FIG. 2 is formed on the wafer. That is, major line (or major loop) 1 on the writing side
and each minor loop 2... are connected via a transfer gate Ti such as a Swasop game) or a transfer gate, and each minor -12... and the major line (or major loop) 3 on the reading side are connected. They are connected via a transfer game 1-To. The major line 1 on the write side is connected to a bubble generator G, and the major line 3 on the read side is connected to a bubble reader.

Bubble generator G generates bubbles corresponding to the information '1' and '0', transfers them on major line 1, and when one column of bubbles reaches transfer gate Ti, it is set to transfer gate Ti. Applying a pulse of current, - all at once the minor loop 2
. . . It is transferred upward, and thereafter it is circulated and stored in the minor loop 2 . . .

Furthermore, when the bubble arrives on the transfer gate To, a pulse current is applied to the transfer gate TO, and the minor loop 2...
The bubble inside is transferred to the major line 3 and read by the reader.

In this way, the pulse current for driving the bubble generator G and the transfer gates Ti and To is obtained by the constant current circuit 4 shown in FIG. That is, when the generator enable signal is input to the constant current circuit 4 from the controller 5 to the generator enable terminal TGE of the constant current circuit 4, the constant current circuit 4
From there, a constant current bubble generation pulse flows to the bubble generator G via the generator terminal Ge of the magnetic bubble storage head M, and a bubble generator is generated. Similarly, when the swap enable signal from the controller 5 is input to the swap enable terminal TSW of the constant current circuit 4, the constant current circuit 4 sends the signal to the transfer gate Ti via the swap gate terminal SW of the magnetic bubble memory element M. A transfer pulse of current flows, and a transfer operation is performed.

Bubble reading is similarly performed by supplying a read pulse from the constant current circuit 4 to the transfer gate To. Furthermore, when a plurality of magnetic bubble memory elements are arranged and driven sequentially, a chip select signal is input from the controller 5 to the constant current circuit 4 at a different timing for each element, and the magnetic bubble memory elements are sequentially selected. and is driven.

By the way, the bubble transfer rate can be increased by simultaneously driving a plurality of magnetic bubble storage elements in parallel. However, with the drive system shown in Figure 2,
When a plurality of magnetic bubble memory elements M are provided, a constant current circuit 4 must be provided for each magnetic bubble memory element, and each constant current circuit must be connected to the controller 5 through a generator enable signal line, a swap enable signal line, etc. Must be.

Therefore, in order to drive a plurality of magnetic bubble memory elements simultaneously, the number of enable signal lines from the controller increases too much, making control difficult, and the controller 5 must be large-scale.

[Purpose of the invention]

The purpose of the present invention is to solve such problems in the conventional magnetic bubble drive method, and to realize a magnetic bubble drive method that requires fewer signal lines even when multiple magnetic bubble storage elements are driven simultaneously in parallel. There is a particular thing.

[Structure of the invention]

The technical means according to the present invention taken to achieve this object includes a major/minor type magnetic bubble storage element, a bubble generating means for generating at least a magnetic bubble in the storage element, and a magnetic bubble storage element in the storage element. A bubble transfer means for transferring a magnetic bubble on the major line or the major loop onto the minor lube, and a constant current supply means for supplying a constant current to the bubble generation means and the bubble transfer means, wherein the constant current The supply means includes a selection signal and first and second control signals, the selection signal being in a selected state and the first control signal being in a first state.
After the second control signal transitions from the first state to the second state, a constant current is applied to the bubble generating means during a period in which the state transitions from the state to the second state and this state is maintained. Only when an enable signal for supplying a constant current is given to the constant current supply means, a constant current is supplied to the bubble generation means, the selection signal is in the selected state, and the second control signal is in the first state. A configuration in which a constant current is supplied to the bubble transfer means only when an enable signal for supplying a constant current to the bubble transfer means is given to the constant current supply means after transition from the state to the second state. are taken.

[Embodiments of the invention]

Next, how the magnetic bubble drive system according to the present invention is actually implemented will be explained using examples.

FIG. 3 is a block diagram showing the basic configuration of the magnetic bubble drive system according to the present invention, and FIG. 4 is a time chart showing the operation of the system. In FIG. 3, on the input side of the constant current circuit 6, in addition to the generator enable terminal "I" Ge and the swap enable terminal TSW-chip select signal terminal C8, two control signal terminals A and B are added. There is.

These two control signals are also output from the controller 5.

FIG. 4 shows the operation of the constant current circuit 6, and shows waveforms at the input and output terminals of the constant current circuit 6. Now, when the chip select signal input to the chip select signal terminal C5 is at L level, the first control signal α input to the first control signal terminal A is at H level, and is input to the second control signal terminal B. The controller 7 controls the control signal β so that the control signal β becomes H level and then becomes L level.
Control signals α and β are input from

Then, when a bubble generation signal is input to the generator enable terminal TGE of the constant current circuit 6, a constant current pulse flows to the magnetic bubble storage element M via the corresponding output terminal OGE. That is, the bubble generator is driven to generate bubbles.

Next, if the chip select signal input to the chip select signal terminal C3 is at the L level, regardless of the state of the control signal α input to the first control signal terminal A, another control signal terminal The second control signal β input to B
At the time when t- falls from the H level to the L level, a gate signal is input to the swap terminal TSH. 6. A constant current pulse flows through the magnetic bubble storage element M through the output terminal OSW corresponding to t-, and transfer Bubbles are transferred all at once by the gate Ti.

However, if the second control signal β is not input to the terminal B even if the first control signal α is input, no generator pulse will flow to the output terminal OGH even if a signal is input to the generator signal terminal TGE. Furthermore, at the time when the second control signal β is not input, even if the SW knob enable signal is input, the gate drive pulse does not flow from the output terminal O3W. Note that when the chip select signal is at H level, the magnetic bubble memory element M is not driven no matter what signal is input.

FIG. 5 shows a specific example of a constant current circuit 6 that performs such an operation, where 6a is a constant current section and 6b is a control circuit added according to the present invention. The control circuit 6b includes two flip-flops FF1 and FF2 and two OR circuits 8.
It has 9. The output of the flip-flop FF1 to which the first control signal α is input is input to the other terminal of the OR circuit 8 to which the generator enable signal is input.

Also, the second' control signal β is applied to both flip-flops Fh.
- The output of the second flip-flop FF2 is input to the other input terminal of the OR circuit 8 to which the swap enable signal is input.

When the L level chip select signal is input to the terminal C3, it is inverted by the inverter 10 and the clear terminal CLI? of the flip-flops FF1 and FF2 is input. is input at H level, and the output terminals of flip-flops FF1 and FF2 become H level. And in this state, the terminal TGE
, Even if the enable signal is input to TSW, the OR circuit 8
．． The output terminal of 9 does not become L level. If the second control signal β is input while the first control signal α is now at the H level and is input to the flip-flop FF1, the output of the flip-flop FF1 is at the L level and the OR circuit 9 Open the gate. Therefore, in this state, when the generator enable signal is input to the terminal TGH, a generator pulse flows from the OR circuit 9 to the magnetic bubble storage element M via the output terminal OGE of the constant current section.

However, when the first control signal α is not input to the flip-flop FF1, the output of the flip-flop FFI remains at H level, so even if the generator enable signal is input, it cannot pass through the OR circuit 9. .

Furthermore, if the second control signal β goes to H level while the first control signal α is not input, the output of the Frisopfron knob FF remains at 1 because the first control signal α is not input. However, flip-flop FF2 is VC
Since C is added, when the second control signal β is input, the output of the flip-flop FF2 becomes L level, and the gate of the OR circuit 8 is opened. Therefore, when a swap enable signal is input in this state, the constant current section 61 is enabled by the output of the OR circuit 8, and a gate pulse flows through the transfer gate terminal OS- of the constant current section.

FIG. 6 shows an embodiment in which two magnetic bubble storage elements M1 and M2 are simultaneously driven in parallel using the control circuit shown in FIG. 5. The constant current circuits 61 and 62 are the same as the constant current circuits 6 in FIGS. 3 and 5, and their respective input terminals are branched from each output terminal of the controller 7 and connected in parallel.
A common signal is input. Second control signal input terminal B1
, B2 only, separate control signals α, β from the controller 7
enters. As shown in the time chart of FIG. 7, the two control signals B1 and B2 are signals whose cycles are slightly shifted.

In the time chart of FIG. 7, the first control signal α and the second control signal β1 have the same relationship as the first control signal α and the second control signal β of FIG. 4. Therefore, the generator enable signal is transmitted to each constant current circuit 61.
62, the enable signal is output only from the output terminal OGEl of the constant current circuit 61 corresponding to the second control signal β1, and a bubble is generated only in the magnetic bubble storage element M1. However, since the constant current circuit 62 corresponding to the second control signal β2 does not enable the generator, no bubble is generated in the second magnetic bubble storage element M2.
It becomes the information of logic "θ".

Then, the swap enable signal is sent to each constant current circuit 61.6.
2, since both the second control signals β1 and β2 are input, the d-force terminals 0FJt and 05W2 of both constant current circuits 61 and 62 enter the swap enable state, and the magnetic bubble memory element M1 In both M2 and M2, the transfer gates operate and transfer to the minor loop is performed all at once.

Next, the input of the first control signal α is delayed so that the second control signal β2 and the first control signal α have the same relationship as in FIG. Then, when the generator enable signal is input next, only the output terminal OGE2 of the constant current circuit 62 corresponding to the second control signal β2 is enabled, and bubble generation is performed. Even if the first control signal β1 is input, the output terminal 0GE1 is not enabled, so no bubble is generated and the logic "0" state is achieved.

Since the second control signals β1 and β2 are also input,
Next, when the swap enable signal is input, the output terminals SW1 and OSW2 of both constant current circuits 61 and 62 are enabled, the transfer gates of both magnetic bubble storage elements M1 and M2 operate, and the bubble is transferred to the minor loop. will be held.

When there are three or more magnetic bubble memory elements, it is possible to further increase the number of magnetic bubble memory elements by increasing the first control signal α such as α1 and α2.

The second control signals are input with shifted timings, such as β1, β2, etc., but the second control signals β1,
By selectively inputting β2..., it is possible to drive only the desired magnetic bubble memory element, and it can also meet requests such as debugging or rewriting information only in a specific element. I can do it.

〔Effect of the invention〕

As described above, according to the present invention, the constant current circuits of the plurality of magnetic bubble elements are connected to one controller, the enable signal line is shared, and only the second signal line is connected at different timings. It is an input method. Therefore, depending on the timing of the first control signal and the second control signal, it is possible to control the generation of bubbles and the transfer of bubbles at the transfer gate. As a result, the number of signal lines from the controller to each constant current circuit can be reduced, and the configuration and control of the controller can be simplified.

[Brief explanation of drawings]

Fig. 1 is a diagram showing the major/minor loop configuration of a known magnetic bubble storage element, Fig. 2 is a block diagram of a conventional magnetic bubble drive method for driving this magnetic bubble storage element, and Fig. 3 is a diagram according to the present invention. A block diagram showing the basic configuration of the magnetic bubble drive system, FIG. 4 is a time chart showing the operation of the same configuration, FIG. 5 is a circuit diagram showing a specific example of the same configuration, and FIG. 6 is a magnetic bubble drive system according to the present invention. FIG. 7 is a block diagram showing an embodiment of the present invention, and does not show the operation of the embodiment, and is a time chart 1. In the figure, M, Ml, and M2 are magnetic bubble elements; 6.
61.62 is a constant current circuit, 6a is a constant current section, 6b is a control circuit, 7 is a controller, TGE is a generator enable signal terminal, TSW is a swap enable signal terminal,
C8 is a chip select signal terminal, A is a first control signal terminal, and B is a second control signal terminal. Patent Applicant Fujitsu Co., Ltd. Agent Patent Attorney Minoru Aoyagi Figure 1 7 products Figure 2

Claims (1)

[Claims] A major/minor type magnetic bubble storage element, a bubble generating means for generating at least a magnetic bubble in the storage element, and a magnetic bubble on the major line or major loop in the storage element to be transferred to the minor loop. A device comprising a bubble transfer means and a constant current supply means for supplying a constant current to the bubble generation means and the bubble transfer means, comprising a selection signal for the constant current supply means and first and second control signals. However, during a period in which the selection signal is in the selection state and the first 11 control signal is transitioning from the first state to the second state and maintaining this state, the second control signal is in the selection state. A constant current is supplied to the bubble generating means only when an enable signal for supplying a constant current to the bubble generating means is given to the constant current supplying means after the transition from the first state to the second state. Further, after the selection signal becomes the selection state and the second control signal transitions from the first state to the second state, the enable signal for supplying a constant current to the bubble transfer means becomes the constant state. A magnetic bubble drive system characterized in that a constant current is supplied to the bubble transfer means only when a constant current is supplied to the current supply means.