JPS62200594A - Magnetic bubble memory controller - Google Patents

Abstract

PURPOSE:To set a page interval freely and to operate an equipment efficiently by generating a constant table by using the total-bit number of respective miner loops inputted from a host computer and the page interval. CONSTITUTION:A magnetic bubble memory element 10 has plural pieces of miner loops and a major loop for read and write, and stores the information that are present at the same position in respective miner loops as pages. A bit weight calculating means 15 receives the information of the total-bit number (M) of the miner loops and that of the page interval (m) inputted from the host computer through a control means 11, and generates the constant table that shows the correspondence between respective bits and weight values, and stores it in a bit weight table 14. An absolute page address calculating means 13 converts a relative page address to an absolute page address by using the values in the table. As a result, the page interval is made able to be freely set, and the operation of the equipment is made efficient.

Description

DETAILED DESCRIPTION OF THE INVENTION [Overview] A magnetic bubble memory element of a magnetic bubble memory device is composed of a plurality of minor loops and a major loop for reading and writing connected to the minor loops via a swap gate. Each magnetic bubble is generated at one point in each minor loop, and the data in the magnetic bubble memory element is stored as one page of data in the same row of multiple minor loops. All the magnetic bubbles in one row are shifted simultaneously, and data is read and written by being transferred out onto the major loop or transferred in from the major loop. In such a magnetic bubble memory device, the addresses of magnetic bubbles on the minor loop are not consecutive addresses, but absolute addresses are assigned at certain page intervals.

That is, an absolute page address is given for each page of one line.

The present invention creates a constant table for converting relative pages to absolute pages based on the total number of bits of each minor loop and the page spacing information in absolute addresses, only by adding and subtracting the bit weight information attached to each bit of the relative page address. To provide a control device that allows free and dynamic setting of page intervals.

According to the present invention, the interval between successive pages can be freely set on the host computer side, and the magnetic bubble memory device can be operated efficiently in terms of application.

[Industrial application field]

The present invention relates to a control device for a magnetic bubble memory device that stores the presence or absence of magnetic bubbles in correspondence with 1 and O, and particularly relates to an address when reading and writing stored data on a minor loop where each magnetic bubble is generated as a page. Regarding the method,
Magnetic bubble memory control that allows page allocation to be changed, allowing the page spacing of absolute pages to be freely set from the host computer when converting relative pages, which are continuous page addresses, to absolute pages, which are given as jump addresses on minor loops. Regarding equipment.

[Conventional technology]

A magnetic bubble memory element is a circuit in which a cylindrical axis called a magnetic bubble appears when a bias magnetic field is applied in a direction perpendicular to the film surface, and the presence or absence of this magnetic bubble is stored in correspondence with 1 and O. As shown in FIG. 2, the chip of the magnetic bubble memory element is composed of a plurality of minor loops 20 as storage areas and a major loop 22 for reading and writing connected to the minor loops 20 through swap gates 21. Each magnetic bubble is generated at one point a1 on each minor loop 20, and the data in the bubble memory is at one line a1 in the minor loop 20.
The data of Q ”-a n-t is stored as one page.
By passing triangular wave currents with different degrees and phases, a rotating magnetic field is generated in the horizontal direction on the surface.

Due to this rotating magnetic field, all the bubbles ao"'a in one row are simultaneously shifted to the upper row b o "b, . One row of bubbles accessed by the rotating magnetic field is transferred to the position of the swap gate 21 and transferred onto the major loop 22 via this.

The bubbles transferred to the major loop 22 continue to circulate. When reading data, it is divided into two bubbles by the replicate gate 24, one is transferred as is on the measure loop 22, and the other bubble is sent to a detector (not shown) and output as an electrical signal. It is thrown away outside the chip.

On the other hand, when writing data, the generator 25 erases old bubbles and generates new bubbles. Bubbles left on the major loop 22 during reading and bubbles generated during writing circulate on the major loop 22, reach the swap gate 21 again, and are transferred to the minor loop 20 for rewriting or new writing. executed. Compared to MOS memory and COD, this type of magnetic bubble memory device is easy to manufacture because the information is nonvolatile and requires fewer masks, and there is no mechanical movement, so it is attracting attention as a paging device in computer systems. There is. However, due to chip manufacturing, there are some cases where defects occur in the minor loop 20.
Among the minor loops 20, there is a dedicated boot loop 26 that stores identification of usable or unusable loops, ie, bad loop information so that only non-defective loops are used. Bad loop information on this boot loop can be called independently from the minor loop,
Once written to a storage medium in a control circuit installed outside the memory, defective loop information is read from the medium to ensure accurate data transfer between a normal minor loop and the outside.

In such a magnetic bubble element, bubbles aQ in one row
All the addresses from A to A are the same, and the addresses are given in accordance with the number of bubbles on each minor loop. These addresses are not given consecutive addresses to adjacent bubbles, but addresses are assigned at certain bit intervals. In other words, if consecutive addresses are assigned to adjacent bubbles and read from a minor loop to a major loop, one adjacent magnetic bubble will have the minimum read operation for the address of the adjacent bubble, but the read operation of the other adjacent bubble will be minimal. When adjacent bubbles are read one after another, reading is performed only after going around the loop once, resulting in a very slow speed. Therefore, absolute addresses are generally assigned at specific bit intervals so that magnetic bubble addresses can be read and written in an average access time. That is, bubble a in one line.

Absolute page addresses are also assigned to a+1-1 at a certain page interval. Therefore, when accessing each page, the host computer uses successive relative page addresses, so it is necessary to convert the relative page address to an absolute page address, and address conversion is performed by page allocation.

The conventional magnetic bubble memory control device, as shown in FIG. Performing a conversion. In this case, the page allocation for determining the page spacing is either fixed to a certain value, or it is provided with bit weight information necessary for converting the relative page address into each bit of binary information. A bit weight table 14 is fixedly provided, and by switching the bit weight table 14 using a setting pin or the like, a desired bit interval, that is, a page interval can be selected.

[Problem that the invention seeks to solve]

This conventional method reads pages continuously,
When manipulating read data or performing other processing between pages, the interval cannot be freely set, which has the disadvantage of poor efficiency. In other words, since the time interval between pages is fixed to a short time for continuous reading of all pages, when manipulating the read data or performing other processing using the page interval time, the If the processing time is long and the page interval is exceeded, continuous pages cannot be read. And at this time 1
It is necessary to give read commands for each page and control information transmission for each page using the software of the host computer, which has the drawback of increasing the burden on the software of the host computer.

The present invention eliminates such conventional drawbacks, inputs the total number of bits in the minor loop of the magnetic bubble memory element and page spacing information from the host computer, and inputs each bit of the relative address and bit weight information. By automatically creating a constant table that corresponds to the page address and storing it in a rewritable memory circuit, and converting a relative page address into an absolute page address using this constant table, the interval between consecutive pages can be calculated automatically. An object of the present invention is to provide a magnetic bubble memory control device that can freely set and change the page layout with high efficiency.

[Means for solving problems]

According to the present invention, the above object includes a plurality of minor loops and a major loop or major line for reading and writing connected to the minor loops through gates, and information on magnetic bubbles at the same position of each minor loop is stored as a page. a magnetic bubble memory device connected to the magnetic bubble memory device and controlling reading and writing of data in the magnetic bubble memory device; a rewritable storage means for inputting information regarding page spacing and storing a constant table in which address values of relative page addresses are associated with constant values necessary for converting from relative page addresses to absolute page addresses; This is achieved by providing a magnetic bubble memory control device capable of changing page layout, characterized in that it has means for calculating an absolute page address from the relative page address using the values of the constant table from the storage means.

[For production]

The present invention inputs the total number of bits of the minor loop and the relative page bit interval from the host computer, and based on these,
The bit weight corresponding to each bit of binary information of the relative page address is calculated, and the bit weight is set in the rewritable constant table.

Then, using this bit weight constant table, an absolute page address is calculated from the given relative page address. In this case, the logic 1 of each bit of the relative page address
The absolute page address is obtained by adding a bit weight corresponding to the total number of bits, and if the total number of bits is larger than the input total number of bits, the total number of bits is decreased until it becomes smaller.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of a magnetic bubble memory device including a magnetic bubble memory control device capable of changing page layout according to the present invention. As shown in FIG. 4, the magnetic bubble memory element 10 has a plurality of minor loops 3 as storage areas.
0 and a reading/writing major loop connected thereto via a swap gate 31, there is a write major line 32 at the top and a read major line 33 at the bottom. Reading and writing are performed by transmitting magnetic bubbles to these lines. Each magnetic bubble is generated at one point a1 of each minor loop 30, and the data in the bubble memory is stored as one page of data from rows ao to a□ in the minor loop 30. Let this be the nth page. All the bubbles ao to a n-t in one line are simultaneously shifted and transmitted to the upper row, and when reading, they are transmitted to the reading major line 33 via the replicator 34, and when writing, they are transmitted to the reading major line 33.
5, the newly generated magnetic bubble is transmitted to the minor loop 30 via the write major line 32. One line of the minor loop 30 corresponds to one page, but the addresses of each page are not consecutive addresses, and the n+1st page is at a position that is skipped by m from the nth page minor loop, assuming the page interval is m. be. When the number of minor loops is Ll and the total number of vias in one loop is M, the m, that is, the page interval, is generally selected to be larger than the number of minor loops L1. The magnetic bubble memory element 10 configured as described above communicates information with the host computer via the control means 11. That is, the control means 11 is connected to the host computer via the host interface 12. Bad loop information for each minor loop of the magnetic bubble memory element is stored in a read only memory (ROM) included in the control means 11. Control means 11
reads the defective loop information from the ROM, writes the information only to the normal minor loop of the magnetic bubble memory element 1α according to its contents, or reads the information from the normal minor loop, and transmits the data to the host interface 12. do.

In such a configuration relationship of the host computer, the control means 11, and the magnetic bubble memory element 10, the page allocation of the minor loop of the magnetic bubble memory element 10, that is, the value of the page interval m, is determined depending on the value between pages. It varies depending on the operation of the data read out and other processing methods. When the page interval m is set, an absolute page address is determined corresponding to each position on the minor loop. For example, if the total number of bits of the minor loop is 19 in decimal notation,
When the page spacing is set to 7 in decimal notation, the absolute page address is 1 as shown in the correspondence table in Figure 5 (al.
Expressed in hexadecimal. In other words, 00 is 01 in decimal notation.
07 corresponds to 7 in decimal notation, and OE corresponds to 14 in decimal notation. Below 02 is 2.09 is 9.10 is 16.04 is 4, O
B is 11.12 is 18.06 is 6, OD is 13.01 is 1.08 is 8, OF is 15.03 is 3, OA is 10,1
1 is 17.05 is 5, OC is 12, 0 in decimal system
A total of 19 addresses from 1 to 18 are specified with a page interval of 7. On the other hand, the address given by the host computer is a relative page address and is a continuous address. Assuming that the total number of bits in the minor loop is 19, the relative page addresses will be assigned consecutive addresses from OO to 12 in hexadecimal notation, as shown on the left side of the correspondence table (a) in FIG. Therefore, it is necessary to convert the relative page address given by the host computer to the absolute page address set on the minor loop. For example, as shown in the correspondence table (a) in Figure 5, the relative page address of each row is corresponded. Must be converted to an absolute page address. For example, if the page spacing is 07, the relative page address OO is converted to the absolute page address 00, the relative page address 0L (hexadecimal) is converted to the absolute page address 07 (hexadecimal), and OB is 01. needs to be converted to

In conventional magnetic bubble memory control devices, this page allocation, that is, page spacing, is fixed at a value of 07, for example, or when changing the page spacing, there are 2.3 types of correspondence tables, which can be switched using a setting pin etc. was.

The present invention does not use such a fixed page layout, but the first page layout.
As shown in the configuration block diagram in the figure, the total number of bits M and the page interval m of each minor loop given by the host computer via the control means 11 are given to the bit weight calculation means 15, and these values are used to calculate the bit weight. The weight calculating means 15 calculates the bit weight value corresponding to the logic 1 of each bit of the relative page address converted from hexadecimal to binary. Then, a constant table indicating the correspondence between each bit and a bit weight value is created, and a bit weight table 1 is constructed from a rewritable storage circuit, that is, a random access memory (RAM).
Store in 4. Using this bit weight table 14, the absolute page address calculator YBt13 adds the bit weight of each bit of the relative page address, and if it is larger than the total number of bits, reduces the total number of bits until it becomes smaller. The absolute page address calculation means 13 converts the relative page address into an absolute page address and supplies it to the control means 11. In this way, in the present invention, the total number of bits M and the page spacing m are freely given by the host computer, so that the spacing between pages can be freely set. For example, as shown in Figure 6 (al), the page spacing ml is narrow (, m+ is the sum of the number of minor loops L1 and the distance from the minor loop to the detector (, L
l+L2) and the number of minor loops L+, the speed becomes very high for continuous reading. That is, Fig. 7 (
As shown in a), the nth page, fi+l page, n+
When reading each page consecutively, such as the second page and the (n+3)th page, the page intervals are set narrowly, so that high-speed reading is possible. Therefore, in this case, no other processing is performed between pages, or processing that allows each page to be processed very quickly is performed. In this way, according to the present invention, the host computer can be set to narrow the page interval.

Furthermore, as shown in FIG. 6(b), the page spacing m2 is wide (,
If Ll+L2 or more, the data transfer is as shown in FIG. 7(b). That is, the interval between each page is m2
-The processing time is proportional to L+. By widening the intervals between pages in this way, it is possible to increase the processing time of the host computer between each page. In other words, increase the page spacing (if you set it, after the host processing is finished,
Data transfer methods such as reading the next page can also be executed. According to the present invention, the host computer side can freely set the interval between successive pages, and by optimizing and setting the page interval throughout the application, efficient operation of the magnetic bubble memory device becomes possible. . The present invention thus has means for inputting the total number of bits M and the page interval m, and rewriting the constant table to convert from a relative page address to an absolute table address. To explain the execution process of this means in detail, FIG. 5(a),
(bl, (C1°(d)) will be explained using an example.

The input data given from the host computer is shown in Figure 5 (C1
As shown in , the total number of bits M and the page spacing m, and in the example, the total number of bits is 19 in decimal (13 in hexadecimal).
and the page spacing is 07 in hexadecimal. In this case the fifth
As shown in FIG. 1
3 executes. The bit weight calculation means 15 is the control means 11
Figure 5 (C
The total number of bits as shown in 1 is input in hexadecimal 13 and the page interval is 07, a constant table as shown in FIG. 5(b) is created and written in the bit weight table 14.

The constant table 14 stores, as a table value, a value determined for each bit of the relative page address as a bit weight value calculated from the total number of bits 13 and the page interval 07. If the total number of bits is 13 in hexadecimal and the page interval is 07, it will be as shown in Figure 5 (bl).The bit weight of the Oth bit from the lower bit of each hexadecimal bit of the relative page is 07. Then, the 1st bit is set to OE, the 2nd bit is set to 9.3rd bit is set to 12.4th bit is set to 11. In other words, the bit weight is set to 7 in decimal from the lower bit.
．． Set the value to 13.9.18.11. Using a constant table as shown in FIG. 5 (bl) stored in the bit weight table 14, the absolute page address calculation means 13 calculates the hexadecimal value of the relative page into a constant table corresponding to the logical 1 of each bit expressed in binary. The indicated bit weight values are first added. Then, as shown in Figure 5 (d>), if the total number of bits exceeds 13 (hexadecimal), the total number of bits 13 is subtracted until it becomes smaller. Calculate, that is, multiply the given relative page address value by 7 to get 19 in decimal.
The absolute page address is calculated using the remainder calculated by 19 as the answer. This remainder calculation is performed by storing the bit weights in a constant table, summing the bit weights, and subtracting the total number of bits if the sum exceeds the total number of bits. It is designed to be easily executed without involving any calculations. For example, as shown in FIG. 5(d), the relative page address is 1.
If it is OB in hexadecimal, the lower 4 bits become 1011 when converted to binary information. In the constant table, each bit of the weight of bit 3.2.1.0 is 1011 from the upper bit. Therefore bit 3.1 corresponding to logic 1
．． The bit weight values shown in constant table (b) corresponding to 0 are 12, OE, and 07. The sum of these is 27 in hexadecimal.

Since this exceeds the total number of bits of 13 (hexadecimal), 13 is subtracted, and since the subtracted value exceeds 13, 1 is added.
Subtract 3. The result is a hexadecimal value of 01. This is a correct value because it is the absolute page address 01 corresponding to the relative page address OB as shown in the correspondence table in FIG. 5 (al).

Based on the calculation method explained above, the relative page address is converted into an absolute page address, which is given to the magnetic bubble memory element via the control means 11, so that information can be read or written from the page of the correct absolute page address. It becomes possible.

〔Effect of the invention〕

As explained above, the present invention creates a constant table from the host computer using the total number of bits of each minor loop and the page spacing, so that the spacing between pages can be freely set, and the spacing between pages can be freely set. This has the effect of allowing the optimum page spacing to be set according to the application, and enables efficient operation of the magnetic bubble memory device.

[Brief explanation of drawings]

FIG. 1 is a configuration block diagram of a magnetic bubble memory control device capable of changing page layout according to the present invention, FIG. 2 is a configuration diagram of a magnetic bubble memory element, and FIG. 3 is a configuration block diagram of a conventional magnetic bubble memory control device. FIG. 4 is a block diagram of a magnetic bubble memory element, FIG. 5 is a diagram for explaining an embodiment of the present invention, and FIG.
bl is a diagram showing the correspondence between the minor loop and the page interval to fully explain the page layout of the minor loop, and Figures 7 (al and 7) are diagrams showing the data transfer and host computer correspondence corresponding to the page layout shown in Figure 4. It is a timing chart showing processing time. 10... Magnetic bubble memory element, 11... Control means, 12... Interface with host computer, 13.
... Absolute page allocation address calculation means, 14 ... Bit weight table, 15 ... Bin) illi calculation means. Patent Applicant: Fujitsu Limited The present invention's #7"#7" of the present invention; Figure 2 Figure 2: Conventional measuring baffle memory # of single-line device #!Bottom mouth 0
9712 m3 diagram

Claims (3)

[Claims] (1) A control means (11) for controlling reading and writing of data in the magnetic bubble memory device; and inputting information regarding the total number of bits of the minor loop and page spacing through the control means, and controlling the address value of the relative page address. and a rewritable storage means (14) for storing a constant table that associates constant values necessary for converting from a relative page address to an absolute page address, and using the values of the constant table of the rewritable storage means. A magnetic bubble memory control device characterized in that it comprises means (13) for calculating an absolute page address from the relative page address. (2) The rewritable storage means has a bit weight calculation means for creating a constant table by associating each bit of the relative page address with a bit weight value corresponding to the page interval. A magnetic bubble memory control device according to claim 1. (3) Information regarding the total number of bits of the minor loop and the page interval is inputted to the bit weight calculation means from the host computer.
The magnetic bubble memory control device described in Section 1.