JPS6113317B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Technical Field of the Invention The present invention relates to a power control system for a magnetic bubble memory device.

(b) Background of the technology Bubble memory elements are made by applying a perpendicular bias magnetic field to the surface of a magnetic thin film to detect the presence or absence of magnetic bubbles.
It has a structure that corresponds to 1 and 0 of the binary information, shifts the signal train by applying a local gradient of the bias magnetic field to the signal train caused by the magnetic bubble, and transfers a predetermined bubble transmission abbreviation, and does not require a power supply to retain information. This is a nonvolatile, large-capacity, serial magnetic memory device.

(c) Prior Art and Problems A typical configuration commonly used in magnetic bubble memory devices is the medium-minor loop method. A magnetic bubble memory device consists of a magnetic bubble memory element and various circuits for driving and supporting the magnetic bubble memory element. In a magnetic bubble memory element, a magnetic field that rotates on a plane parallel to the magnetic bubble propagation plane drives a multi-phase coil and advances in a fixed direction every rotation, thereby creating a data propagation loop (hereinafter referred to as a "minor loop") or data writing. / Propagate the reading loop (hereinafter referred to as the "medium loop"). FIG. 2 shows a configuration diagram of the conventional magnetic bubble element in FIG. 1 and an embodiment of the present invention. In FIG. 1, 1 and 1a are magnetic bubble generators, 2 and 2a are write major loops, 3 are writers, 4 and 4a are minor loops, 5 and 5a are read major loops, 6 are magnetic bubble replicators, and 7 and 7a are
1 is a detector, 11 is a write circuit connection terminal, 12 is a replication circuit connection terminal, 13 is a detection/read circuit connection terminal, and 14 is an erase circuit connection terminal. The magnetic bubble generated by generator 1 is connected to the write medium loop 2, 2.
a, and when they are aligned at each position of the writer T3, a current is applied to the terminal 11, the writers T3 are opened all at once, and the magnetic valves on the write major loops 2, 2a are connected to each minor loop 4. , 4a are replaced together and written to each minor loop 4, 4a. Thereafter, the magnetic bubbles on the minor loops 4, 4a circulate according to the rotating magnetic field. Further, when the magnetic bubbles on the minor loops 4, 4a are aligned at each position of the duplicator B6, a current is applied to the terminal 12, and the magnetic bubbles on the minor loops 4, 4a are read all at once and are duplicated in the major loops 5, 5a. The magnetic bubble replicated on the reading medium loop 5, 5a is detected by the detector D.
7 and 7a and are enlarged, and the presence or absence of the bubble is converted into electrical signals 1 and 0 by a detection reading element constituted by, for example, a magnetoresistive element, and sent from the reading terminal 13. Further, unnecessary magnetic bubbles can be erased by applying a current to the loop through a perpendicular demagnetizing field from the erase signal terminal 14.

The magnetic bubble memory device further includes one or more magnetic bubble memory elements 1 as shown in the block diagram of a conventional magnetic bubble memory device in FIG.
Various circuits are provided to drive 0. In the figure, 10 is a magnetic bubble memory element, 20 is a control unit, 20a is a control circuit, 20b is a timing circuit, 21 is a rotating magnetic field H _R drive circuit, 22 is a function drive circuit, 23 is a detection circuit, and 24 is a power switch. . The control circuit 20a receives and decodes each control signal from the outside, and controls the waveform via a timing circuit 20a to each circuit described later, manages and synchronizes the positions of the magnetic bubbles on the minor loops 4 and 4a, and performs magnetic bubble control. It holds the position information of the defective minor loop written in the memory element, and performs invalidation processing regarding the defect position when reading or writing. The timing circuit 20b is the control circuit 20
Timing control is performed according to a preset sequence according to the control data of a. The H _R drive circuit is a circuit that drives, for example, a two-phase coil to generate an in-plane rotating magnetic field that advances the magnetic bubble in the magnetic bubble memory element. The function drive circuit 22 sends write, erase, and copy signals to the magnetic bubble memory element 10 in accordance with the timing signal from the timing circuit 20b to cause the magnetic bubble memory element 10 to perform each function. The detection circuit 23 amplifies and shapes the detection signal from the magnetic bubble memory element 10 to a logic level and sends it to the control circuit 20a. The power switch 24 opens and closes one or more power sources necessary for the above circuit operation.
In the conventional magnetic bubble memory device, when the power switch 24 is turned on, power is supplied to all the circuits and the circuits become operational. At this time, since the magnetic bubble memory device is a serial memory, it is prepared in advance when the power is turned on in order to detect in which position in the order of the minor loops 4 and 4a the data is written as an initialization operation before performing the write/read operation. A magnetic bubble of a minor loop for a marker indicating the position of the data stored in the normal cue, for example, address 0, is detected and aligned with the magnetic bubble position management control function provided in the control circuit 20a. At the same time, the control circuit 20 reads the position information of the defective minor loop of the magnetic bubble memory element.
Stored in a.

By performing the above-mentioned initialization operation when the power is turned on, the magnetic bubble memory device becomes ready and enters a standby state until an access control signal for writing/reading is received from the outside. When the control circuit 20a receives a control signal from the outside, it sends a control signal to the H _R drive circuit 21, function drive circuit 22, and detection circuit 23 via the timing circuit 20b.
A performs information position management, magnetic bubble writing, detection, erasing, minor loop defect control, etc., completes its operation, and returns to a standby state.

In the standby state, the magnetic bubble memory element is a non-volatile memory that does not require a power supply.
Unlike other IC memories, it does not require power to hold data, but as a magnetic bubble memory device, power is supplied to each peripheral circuit, which consumes power. In this standby state, the power can be temporarily turned off, but the above-mentioned initialization operation is required before the write/read operation can be performed according to the control signal when access is received from the outside, which has the disadvantage of significantly delaying access. It was hot.

(d) Purpose of the Invention The purpose of the present invention is to eliminate the above-mentioned drawbacks by cutting off most of the power consumption in the standby state to provide a means for saving power without significantly delaying access. It is something.

(e) Structure of the Invention The object is to provide a magnetic bubble memory device comprising one or more magnetic bubble memory elements, peripheral circuits for driving the elements, and a control circuit, including a rotating magnetic field drive circuit for the magnetic bubble memory elements; A function drive circuit, a magnetic bubble detection circuit, a timing circuit for the control section, one or more first power supply means required for each circuit, a control circuit for the remaining control section, and one or more second power supply means required for the control circuit. A power supply control system for a magnetic bubble memory device, characterized in that the power supply means constitutes two power supply series, and the control circuit is provided with means for sequentially or simultaneously controlling application and disconnection of power for each power supply series according to external access. This can be achieved by providing

(f) Embodiment of the invention An embodiment of the invention will be described below with reference to the drawings. FIG. 3 shows a block diagram of a power supply control system for a magnetic bubble memory device according to an embodiment of the present invention. In the figure, 10 is a magnetic bubble memory element, 20 is a control section, 20a is a control circuit, 2
0b is a timing circuit, 21 is an H _R drive circuit, 2
2 is a function drive circuit, 23 is a detection circuit,
24 is a power switch and 25 is an application/cutoff circuit. In each reference numeral in the figure, constituent members having the same reference numerals as those in FIG. 2 have the same functions as those described above. As shown in FIG. 3, in the present invention, the power supply is divided into two systems, the first system being connected to the control circuit 2.
The group includes the H _R drive circuit 21, the function drive circuit 22, the detection circuit 23, and the timing circuit 20b, which are supplied with power via the application/cutoff circuit that operates according to the control of the power switch 0a. The control circuit 20a and the cutting/applying circuit 2 are directly supplied with power by opening and closing 24.
There are 5 groups. Here, when powering on the magnetic bubble memory device, as in the conventional case, power is initially supplied to all circuits and the control circuit 20a performs an initial operation.
Thereafter, in the standby state, the control circuit 20a operates the application/cutoff circuit 25 to cut off the power supply. Then, each time an access is made from the outside, the control circuit 20a applies
The disconnection circuit 25 supplies power to each circuit that is inactive, and supplies power to all circuits to perform write and read operations as in the conventional case. In this way, in the standby state, the power consumption of each circuit in the first series is reduced to 0, and when power is turned on for all circuits under the control of the control circuit 20a, the control circuit 20a
At 0a, the position information of the magnetic bubble and the defect information of the minor loop are retained and all functions are activated, so after power supply starts up, write as before.
Read operations can be performed.

(g) Effects of the Invention As explained above, according to the present invention, in addition to the feature that the magnetic bubble memory device does not require power for data retention when it is not in use, it also has the feature that the magnetic bubble memory device does not require any power for data retention when the device is not in use. This is useful because it provides a power control scheme that can reduce the power consumption of the circuit during standby without impairing write and read operations for accesses from.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a conventional magnetic bubble memory device and an embodiment of the present invention, FIG. 2 is a block diagram of a conventional magnetic bubble memory device, and FIG. 3 is a magnetic bubble memory device according to an embodiment of the present invention. A block diagram of the power supply control method is shown. In the figure, 10 is a magnetic bubble memory element, 20
a is a control circuit, 20b is a timing circuit, 21 is a rotating magnetic field drive circuit, 22 is a function drive circuit, 23 is a detection circuit, 24 is a power switch, and 25 is an application/cutoff circuit.

Claims (1)

[Claims] 1. In a magnetic bubble memory device comprising one or more magnetic bubble memory elements, peripheral circuits for driving the elements, and a control circuit, a rotating magnetic field drive circuit, a function drive circuit, and a magnetic bubble detection circuit for the magnetic bubble memory element are provided. and a timing circuit of the control section and one or more first power supply means required for each circuit, and a control circuit of the remaining control section and one or more second power supply means required for the control circuit. 1. A power control system for a magnetic bubble memory device, characterized in that the control circuit is provided with means for sequentially or simultaneously controlling application and disconnection of power for each power supply series in accordance with external access.