JPS597147B2 - magnetic bubble storage device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic bubble storage device, and more particularly to an improvement of a magnetic bubble storage device in which access requests are regular and the number of words transferred for each access is constant.

Conventional magnetic bubble storage devices are generally configured as random access memories. Therefore, a rotating magnetic field is constantly generated to move the magnetic bubble, and when an access request is made, the zeta address and number of transfer words are received, and the specified information group is transferred from the minor loop to the major loop on the magnetic bubble chip. After transferring out a plurality of times and performing a read or write operation, the information group on the major loop is transferred in to the minor loop, and the access is completed. However, depending on the application, access requests to the storage device may be regular and the number of transferred words may be constant.

It is extremely uneconomical to use a magnetic bubble storage device configured as a random access memory as described above as a storage device for such a purpose (hereinafter referred to as a block access memory). SUMMARY OF THE INVENTION In view of the above, an object of the present invention is to provide a magnetic bubble storage device that is optimal for applications where access requests are regular and the number of transferred words is constant.

The present invention will be explained in detail below. In magnetic bubble storage devices, words are generally organized as bits/chips.

Further, the number of bits transferred out from the minor loop to the major loop in one transfer out matches the number of effective minor loops. Therefore, if n is the number of bits required for one access, n is the effective number of minor loops, and is m is the number of chips transferred out at the same time, then the magnetic bubble storage device transfers out n/Mt times for each access request. It would be a good idea to control it. In addition, as long as the magnetic bubble starts and stops the rotating magnetic field correctly, the information will not be destroyed even in the absence of the rotating magnetic field.
It is also possible to stop the rotating magnetic field after reading or writing is completed and the information group has been transferred from the major loop to the minor loop. The present invention was realized by focusing on the characteristics of the magnetic bubble storage device described above. That is, the characteristics of the magnetic bubble storage device according to the present invention are as follows.
Only when a read or write access is requested, a rotating magnetic field is generated to advance the magnetic bubble, and the transfer-out is performed a specific number of times, so that all the transferred information is transferred in. The purpose is to configure the rotating magnetic field to be stopped later. Next, an example of a magnetic bubble storage device according to the present invention will be explained with reference to the accompanying drawings.

1 is an interface circuit with the processing device; 2 is a read/write designation circuit that accepts read or write requests;
3 is an address register; 4 is an address match circuit that compares the contents of the minor loop counter 5 and the minor address register 3; 5 is a minor loop counter that counts the number of bits that the magnetic bubble advances through the minor loop in the chip; A major loop counter that counts the number of bits that the transferred out magnetic bubble advances in the major loop; 7 is a data register; 8 is a timing creation circuit that creates timing; 9 is a rotating magnetic field control that controls the rotating magnetic field. The circuit includes a transfer out counter 10 for counting the number of transfer outs, 11 a chip drive circuit, 12 a coil drive circuit, 13 a bubble memory module, and 14 a sense amplifier circuit.

Explain the operation.

When a read or write access request is received from the processing device, the read/write designation circuit 2 controls the rotating magnetic field control circuit 9.
This activates the minor loop counter 5 and transmits the contents of the access request to the chip drive circuit 11. As a result, the coil drive circuit 12 starts operating, a rotating magnetic field is generated, and the minor loop counter 5 starts counting. Note that the minor address register 3 stores a minor address from the processing device. When the designated storage information group on the minor loop advances to the position where it is transferred out, the minor address match circuit 4
A match is broken and a transfer out signal is issued.

In response to this transfer out signal, the chip drive circuit 11 is activated, and the stored information group is transferred out from the minor loop to the major loop. At the same time,
The transfer out counter 10 counts up by one, and the medium loop counter 6 starts counting. When the major loop counter counts up to a specific position, the chip drive circuit 11 is activated and the information on the major loop is accessed for reading or writing.

After the transferred out information goes around the major loop once, it is transferred into the minor loop. Thereafter, the transfer-out operation described above is resumed. Transfer-out is repeated a predetermined number of times, and when processing corresponding to a predetermined number of transferred words is completed, a signal is output from the transfer-out counter 10.

This signal clears the minor address register 3 and stops the counting of the major loop counter 6.
The rotating magnetic field control circuit 9 includes a transfer out counter 1
When a signal from 0 is received, the information on the major loop is completely transferred to the minor loop while referring to the contents of the minor loop counter 5, and then,
The operation of the coil drive circuit 12 is stopped, and the generation of the rotating magnetic field is stopped.

In practice, the rotating magnetic field is stopped when the transferred information advances in the minor loop by, for example, 1 to 10 bits. As described above, in the magnetic bubble storage device according to the present invention, data addresses correspond to bits in the minor loop, so the number of address registers and address comparison circuits can be reduced, and the number of transferred words (number of transferred bits) can be reduced.
Since it is fixed, the register for specifying the transfer word and the interface with the processing device are simple, so a small and inexpensive magnetic bubble storage device can be constructed.

Furthermore, since the rotating magnetic field is stopped after access is completed, power consumption is also reduced. Although the above embodiment has been described as a storage device using magnetic bubble memory chips with a major and minor loop configuration, the present invention can also be applied to storage devices using chips with a two-major line configuration or other modified configurations. Of course, it is effective.

[Brief explanation of the drawing]

The figure is a block diagram showing an example of a magnetic bubble storage device according to the present invention. 2...Read/write designation circuit, 3...
Minor address register, 4...address match circuit, 5...minor loop counter, 6...
...Measure loop counter, 9...Rotating magnetic field control circuit, 10...Transfer out counter, 11...Chip drive circuit, 12...
...Coil drive circuit, 13...Bubble memory module.

Claims (1)

[Claims] 1. In a magnetic bubble storage device that uses a magnetic bubble chip composed of a major loop and a minor loop, and generates and stops a rotating magnetic field for stepping the magnetic bubble, information stored on the minor loop is generated by the rotating magnetic field. a first means for monitoring the progress and deriving a transfer out signal for transferring the stored information from the minor loop to the major loop when it is detected that the designated stored information on the minor loop has stepped to a predetermined position; a second means for counting the number of transfer outs and detecting the end of the final transfer out of the set number of times; and third means for stopping the generation of the rotating magnetic field after the information placed on the magnetic bubble or the written information corresponding thereto is transferred into the minor loop.