JPS6334557B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention involves generating magnetic bubbles (hereinafter abbreviated as "bubbles") in a bubble wafer, which is a magnetic medium, and
This invention relates to a magnetic bubble drive system that reads, writes, and stores information by transferring it.

[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 drive system 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, the 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 swap gate or transfer gate, and each minor loop 2 is connected to the major line (or major loop) 3 on the reading side. are connected via a transfer gate To.
The measuring line 1 on the writing side is connected to a bubble generator G, and the measuring line 3 on the reading side is connected to a bubble reader D.

Bubble generator G generates bubbles in response to information "1" and "0", transfers them on major line 1, and when one row of bubbles reaches transfer gate Ti, it is set at transfer gate Ti. A pulse of current is applied and transferred all at once to the minor loop 2, and thereafter it is circulated and stored in the minor loop 2.
When the bubble arrives on the transfer gate To, a pulse current is applied to the transfer gate To to transfer the bubble in the minor loop 2 to the major line 3, and the reader D reads the bubble.

In this way, the bubble generator G, transfer gate Ti,
The pulse current for driving To is obtained by the constant current circuit 4 shown in FIG. That is, the generator tie enable signal is sent from the controller 5 to the constant current circuit 4, and the generator tie enable terminal of the constant current circuit 4 is sent to the generator tie enable terminal of the constant current circuit 4.
When input to TGE, from the constant current circuit 4 through the generator terminal Ge of the magnetic bubble storage element M,
A constant current bubble generation pulse flows through the bubble generator G to generate bubbles. Similarly, a swap enable signal is sent from the controller 5 to the constant current circuit 4.
When inputting to the swap enable terminal TSW of
A constant current transfer pulse flows from the constant current circuit 4 to the transfer gate Ti via the swap gate terminal SW of the magnetic bubble storage element M, and a transfer operation is performed.

Bubble reading is done in the same way, constant current circuit 4
This is done by supplying a read pulse from 1 to the transfer gate To. In addition, when multiple 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 different timings 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, in the drive system shown in FIG. 2, when a plurality of magnetic bubble memory elements M are provided, a constant current circuit 4 is provided for each magnetic bubble memory element, and a generator tie enable signal line and a swap are provided for each constant current circuit. It must be connected to the controller 5 via a plug-enable signal line or the like. Therefore, in order to drive a plurality of magnetic bubble storage 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]

Technical means according to the present invention taken to achieve this object include 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 device comprising a bubble transfer means for transferring a magnetic bubble on a major line or a major loop onto the minor loop, 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 supply means comprising a selection signal and first and second control signals, wherein the selection signal enters a selection state, and the first control signal transitions from a first state to a second state and maintains this state. After the second control signal has transitioned from the first state to the second state during the period when Only when a constant current is supplied to the bubble generation means, and after the selection signal is in the selection state and the second control signal has transitioned from the first state to the second state, the bubble transfer means A configuration is adopted 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 applied to the constant current supply means.

[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 tie enable terminal TGe, swap enable terminal TSW, and chip select signal terminal CS, two control signal terminals A and B are added. . 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. Chip select signal terminal
When the chip select signal input to CS is at L level, the first control signal α input to first control signal terminal A is at H level, and the control signal β input to second control signal terminal B is at H level. The controller 7
Control signals α and β are input from

Then, when a bubble generation signal is input to the generator tie enable terminal TGE of the constant current circuit 6,
A constant current pulse flows through 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 CS is at L level, regardless of the state of the control signal α input to the first control signal terminal A, another control signal terminal B is input to the chip select signal terminal B. At the time when the input second control signal β falls from the H level to the L level, a gate signal is input to the swap terminal TSW. Then the corresponding output terminal
A constant current pulse flows through the magnetic bubble storage element M through the OSW, and the bubbles are transferred all at once by the transfer gate Ti.

However, if the second control signal β is not input to terminal B even if the first control signal α is input, no generator pulse will flow to the output terminal OGE even if a signal is input to the generator signal terminal TGE. .
Furthermore, even if the swap enable signal is input at the time when the second control signal β is not input, the output terminal
No gate drive pulse flows from OSW. 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 constant current section.
is a control circuit added according to the present invention. The control circuit 6b includes two flip-flops FF ₁ ,
It is equipped with FF ₂ and two OR circuits 8 and 9. and a flip-flop to which the first control signal α is input.
The output of FF ₁ 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.
input to FF ₁ and FF ₂ , and the second flip-flop
The output of FF ₂ is input to the other input terminal of the OR circuit 8 to which the swap enable signal is input.

The chip select signal that is currently at L level is the terminal CS.
is inverted by the inverter 10 and sent to the clear terminals CLR of flip-flops _FF1 and _FF2 .
level and input flip-flop FF ₁ ,
The output terminal of FF ₂ becomes H level. In this state, even if the enable signal is input to the terminals TGE and TSW, the output terminals of the OR circuits 8 and 9 do not go to 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 FF ₁ , the output of the flip-flop FF ₁ becomes the L level and is input to the OR circuit 9. Open the gate. Therefore, in this state, when the generator enable signal is input to the terminal TGE, the 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, the first control signal α is a flip-flop
Since the output of flip-flop FF ₁ remains at the H level when no signal is input to FF ₁ , even if the generator enable signal is input, it cannot pass through the OR circuit 9.

Furthermore, when the second control signal β goes to H level while the first control signal α is not input, the output of flip-flop FF ₁ remains at H level because the first control signal α is not input. However, since Vcc is applied to the flip-flop FF ₂ , when the second control signal β is input, the output of the flip-flop FF ₂ becomes L level, and the OR circuit 8
Open the gate. Therefore, when the swap enable signal is input in this state, the constant current section 61 is enabled by the output of the OR circuit 8, and the voltage is output via the transfer gate terminal OSW of the constant current section.
Gate pulse flows.

FIG. 6 shows an embodiment in which two magnetic bubble storage elements M ₁ and M ₂ 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 circuit 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, so that a common signal is input. . Separate control signals α and β are input from the controller 7 only to the second control signal input terminals B ₁ and B ₂ . As shown in the time chart in Figure 7,
The two control signals B ₁ and B ₂ are signals whose periods are slightly shifted.

Now, in the time chart of FIG. 7, the first control signal α and the second control signal β ₁ are the same as the relationship between the first control signal α and the second control signal β of FIG. . Therefore, even if the generator enable signal is input to each constant current circuit 61, 62, the enable signal is output only from the output terminal _OGE1 of the constant current circuit 61 corresponding to the second control signal _β1 . ,
Bubbles are generated only in the magnetic bubble storage element _M1 .
However, the constant current circuit 6 corresponding to the second control signal β ₂
Since the generator is not enabled in M2, no bubble is generated in the second magnetic bubble storage element _M2 , and the information becomes logic "0".

Next, when the swap enable signal is input to each constant current circuit 61, 62, the second control signal β ₁ also becomes β ₂
are also input, so both constant current circuits 6
1 and 62 output terminals OSW ₁ and OSW ₂ are in the swap enable state, and the magnetic bubble storage element M ₁
For both M2 and _M2 , the transfer gate operates 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 β ₂ and the first control signal α have the same relationship as in FIG. 4. Then, when the generator enable signal is input next, the output terminal of the constant current circuit 62 corresponding to the second control signal β ₂
Only OGE ₂ is enabled and bubble generation is performed. Even if the first control signal β ₁ is input, the output terminal OGE ₁ is not enabled, so no bubble is generated and the output terminal OGE 1 is in the logic “0” state.

Since the second control signals β ₁ and β ₂ are also input, the next time the swap enable signal is input,
Both constant current circuits 61 and 62 have output terminals OSW ₁ ,
OSW ₂ is enabled, and the transfer gates of both magnetic bubble storage elements M ₁ and M ₂ operate to transfer bubbles to the minor loop.

If there are three or more magnetic bubble memory elements, the first
By increasing the control signal α to α ₁ , α _{2 ,} etc., it is possible to further increase the multiplicity.

The second control signals are input with shifted timings, such as β ₁ , β _{2 . .} . , and by selectively inputting the second control signals β ₁ , β ₂ . It is also possible to drive only the memory element, which can meet requests such as debugging or rewriting information only in a specific element.

〔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 now a method of input. 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 the drawing]

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 system 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, and FIG. 5 is a circuit diagram showing a specific example of the same configuration.
FIG. 6 is a block diagram showing an embodiment of the magnetic bubble drive system according to the present invention, and FIG. 7 is a time chart showing the operation of the same embodiment. In the figure, M, M ₁ , M ₂ are magnetic bubble elements,
6, 61, 62 are constant current circuits, 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, CS is a chip select signal terminal, A is a first control signal terminal, B is a second control signal Each terminal is shown.

Claims (1)

[Claims] 1. 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 bubble transfer for transferring the magnetic bubble on the major line or the major loop in the storage element onto the minor loop. and 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, During a period in which the selection signal is in the selection state and the first control signal is transitioning from the first state to the second state and maintaining this state, the second control signal is in the first 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 transition from the state to the second state, and After the selection signal enters the selection state and the second control signal transitions from the first state to the second state, an enable signal for supplying a constant current to the bubble transfer means is activated by the constant current supply means. A magnetic bubble drive system characterized in that a constant current is supplied to the bubble transfer means only when the current is applied to the bubble transfer means.