GB2117947A - Magnetic bubble memory device - Google Patents
Magnetic bubble memory device Download PDFInfo
- Publication number
- GB2117947A GB2117947A GB08308940A GB8308940A GB2117947A GB 2117947 A GB2117947 A GB 2117947A GB 08308940 A GB08308940 A GB 08308940A GB 8308940 A GB8308940 A GB 8308940A GB 2117947 A GB2117947 A GB 2117947A
- Authority
- GB
- United Kingdom
- Prior art keywords
- magnetic bubble
- bubble memory
- information
- memory element
- memory device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C19/00—Digital stores in which the information is moved stepwise, e.g. shift registers
- G11C19/02—Digital stores in which the information is moved stepwise, e.g. shift registers using magnetic elements
- G11C19/08—Digital stores in which the information is moved stepwise, e.g. shift registers using magnetic elements using thin films in plane structure
- G11C19/0875—Organisation of a plurality of magnetic shift registers
Landscapes
- For Increasing The Reliability Of Semiconductor Memories (AREA)
Abstract
In a magnetic bubble memory device having in combination a magnetic bubble memory element 11 having a specific loop 14 within a minor loop group 13 for storing magnetic bubble reference information and a control circuit 12 for controlling the magnetic bubble memory element, there is stored in the specific loop information specifying e.g. the memory capacity or configuration or identifying the magnetic bubble memory element and for controlling its operation. The control circuit reads out the information to input it into an information setting circuit (e.g. RAM) immediately after the operation of the magnetic bubble memory device is started. <IMAGE>
Description
SPECIFICATION
Magnetic bubble memory device
This invention relates to a magnetic bubble memory device and, more particularly, to a magnetic bubble memory device, in which information specifying a magnetic bubble memory element of the device is stored in the magnetic bubble memory element and the information is read out into an information setting circuit, for instance, a random access memory, provided in a control circuit, thereby permitting the control circuit to control magnetic bubble memory elements having different capacities.
In a prior art magnetic bubble memory device, information specifying a magnetic bubble memory element of the device and necessary for controlling the magnetic bubble memory element, i.e., the number of minor loops, the number of bits in each minor loop, the number of read line bits, the number of write line bits, etc., are stored or set in a predetermined circuit of a control circuit. The element is controlled on the basis of the information so as to read or write magnetic bubbles. Therefore, the control circuit is dedicated to the element and only a particular kind of magnetic bubble memory element can be controlled by the control circuit. In other words, individual magnetic bubble memory elements must be combined with individual corresponding control circuits. Therefore, the magnetic bubble memory device becomes costly and flexibility of use of the control circuit is impaired.
An object of this invention is to provide a
magnetic bubble memory element capable of improving flexibility of use of a control circuit to be
used in combination therewith.
Another object of this invention is to provide a
magnetic bubble memory device having a control circuit adaptable for magnetic bubble memory elements of different capacities.
According to one aspect of the present invention, a magnetic bubble memory element
having a specific loop within a minor loop group for storing magnetic bubble information has information stored in the specific loop and used for identifying the magnetic bubble memory element and controlling its operation.
According to another aspect of the invention, in a magnetic bubble memory device having in combination a magnetic bubble memory element having a specific loop within a minor loop group for storing specification of magnetic bubble and a control circuit for controlling the magnetic bubble memory element, the element has information stored in the specific loop and used for specifying or identifying the magnetic bubble memory element and controlling its operation, and the control circuit reads out the specifying or identifying and controlling information to input it into an information setting circuit immediately after the operation of the magnetic bubble memory device is started.
Fig. 1 is a schematic diagram showing a magnetic bubble memory device according to the present invention; and
Fig. 2 is a diagrammatic representation of a specific loop according to the present invention.
Referring now to Fig. 1, there is shown a
magnetic bubble memory device 10 of the present
invention which comprises a magnetic bubble
memory element 1 1, a control circuit 12, an
amplifier 19 and a driver circuit 20. Magnetic
bubbles generated at a bubble generator 15 are
propagated through a write line 16 and transferred into a minor loop group 13 including a
number of minor loops 13-1, 13-2, 13-3,... and
1 3-n for storing information represented by the
magnetic bubbles. When reading bubble
information, the stored information is transferred to read line 17 so as to be detected by a detector
18 and a detected signal from the detector 18 is
amplified by an amplifier 19 and supplied to a
controller.As far as a specific loop 14 is
concerned, an independent swap gate for
exchange of information on the write line 16 with
information on the minor loop and an independent
replicate gate for replication of information on the
minor loop into information on the read line 17 are
employed so that read/write can be performed
independently of the loops 13-1 to 1 3-n.
Information from the loops 13-1 to 1 3-n is fed to
an external circuit 21 via a transfer switch. The
driver circuit 20 is adapted to generate a rotating
magnetic field necessary for the bubble memory
element and to supply pulse current thereto. This
drive circuit 20 is controlled by the controller 12 in
compliance with the operation of the magnetic
bubble memory element. Usually, position
information representative of a defective loop is
stored in a specific loop 14 in the minor loop
group 13. To be more specific, as shown in Fig. 2,
index information 1 4a indicative of a start, zero
address and defective loop position information
1 4b immediately following the index information
1 4a are stored in the specific loop 14.
According to the present invention, the specific
loop 14 has additional information 1 4d used for
specifying or identifying the magnetic bubble
memory element, particularly capacity thereof,
and controlling its operation. More particularly,
immediately after the index information 1 4a and
the defective loop position information 1 4b, index
information 1 4c indicative of the fact that the
following information 1 4d is data for specifying or
identifying and controlling the magnetic bubble
memory element and the data 1 4d is stored. The
data 1 4d must be stored in a predetermined order.
For example, the number of minor loops, the
number of bits in each loop, the number of read
line bits and the number of write line bits may be
stored in the mentioned order. Alternatively, it is
possible to store a predetermined constant
subsequent to the index 1 4c to permit detection constant subsequent to the index 1 4c to permit detection as to whether the relevant data
represents the number of loops or the number of
bits in the loop. As a further modification, it is
possible to permit only different memory capacity
data to be stored in the magnetic bubble memory element. To be more specific, a data identifying a magnetic bubble memory element, figure 1, for instance, may be stored for a 1 -Mb magnetic bubble memory element, figure 4 for a 4-Mb magnetic bubble memory element, and so forth.In this case, data such as the number of minor loops and the number of bits in each loop for each of the 1-Mb and 4-Mb magnetic bubble memory elements is stored in a memory such as a read only memory and read out to select from a ROM the data corresponding to the 1-Mb or 4-Mb memory capacity. In this manner, read operation of the magnetic bubble memory element is carried out. Thus, magnetic bubble memory elements having different capacities can be controlled automatically.
The constant data read out of the specific loop 14 of the magnetic bubble memory element 1 1 is inputted to an information setting circuit, for example, in the form of a random access memory (RAM) of the control circuit 1 2. Thus, the control circuit 12, in accordance with specifying or identifying data for the magnetic bubble memory element 11, controls its operation on the basis of the data immediately after the operation of the magnetic bubble memory device is started. For example, when the read-out data conicides with the information stored in the RAM, the control circuit 12 controls the magnetic bubble memory element 11 in accordance with information corresponding to the read-out data and necessary for the operation of the element.
As has been described in the foregoing, according to the invention where magnetic bubble memory elements having different memory capacities are used as in a magnetic bubble memory cassette, they can be controlled by a single common magnetic bubble memory element control circuit, and flexibility of use of the control circuit can be improved.
Claims (7)
1. A magnetic bubble memory element having a specific loop within a minor loop group for storing magnetic bubble information, said elements having information stored in the specific loop and used for specifying or identifying the magnetic bubble memory element and controlling its operation.
2. A magnetic bubble memory element according to Claim 1 wherein said specifying or identifying and controlling information comprises data which includes the number of loops, the number of bits in the loop, the number of read line bits and the number of write line bits for said element.
3. A magnetic bubble memory device having in combination a magnetic bubble memory element having a specific loop within a minor loop group for storing magnetic bubble information and a control circuit for controlling the magnetic bubble memory element, said element having information stored in the specific loop and used for specifying or identifying the magnetic bubble memory element and controlling its operation, and said control circuit reading out the specifying or identifying and controlling information to input it into an information setting circuit immediately after the operation of the magnetic bubble memory device is started.
4. A magnetic bubble memory device according to Claim 3 wherein said specifying or identifying and controlling information comprises data which includes the number of loops, the number of bits in the loops, the number of read line bits and the number of write line bits for said element.
5. A magnetic bubble memory device according to Claim 3 wherein said information setting circuit comprises a random access memory.
6. A magnetic bubble memory element substantially as described herein with reference to the accompanying drawings.
7. A magnetic bubble memory device substantially as described herein with reference to the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57053856A JPS58171782A (en) | 1982-04-02 | 1982-04-02 | Magnetic bubble memory device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB8308940D0 GB8308940D0 (en) | 1983-05-11 |
| GB2117947A true GB2117947A (en) | 1983-10-19 |
Family
ID=12954411
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08308940A Withdrawn GB2117947A (en) | 1982-04-02 | 1983-03-31 | Magnetic bubble memory device |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPS58171782A (en) |
| GB (1) | GB2117947A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2014767A (en) * | 1978-02-17 | 1979-08-30 | Hitachi Ltd | Memory devices |
| GB2017983A (en) * | 1978-03-27 | 1979-10-10 | Ibm | Magnetic bubble domain memory system |
| GB1594250A (en) * | 1977-02-11 | 1981-07-30 | Texas Instruments Inc | Magentic bubble memory chip synchronization and redundancy |
-
1982
- 1982-04-02 JP JP57053856A patent/JPS58171782A/en active Pending
-
1983
- 1983-03-31 GB GB08308940A patent/GB2117947A/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1594250A (en) * | 1977-02-11 | 1981-07-30 | Texas Instruments Inc | Magentic bubble memory chip synchronization and redundancy |
| GB2014767A (en) * | 1978-02-17 | 1979-08-30 | Hitachi Ltd | Memory devices |
| GB2017983A (en) * | 1978-03-27 | 1979-10-10 | Ibm | Magnetic bubble domain memory system |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58171782A (en) | 1983-10-08 |
| GB8308940D0 (en) | 1983-05-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |