JPS6333237B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic bubble memory device, and more particularly to a magnetic bubble memory device that uses a combination of fixed magnetic bubble memory elements and removable magnetic bubble memory elements.

As is already known, a general magnetic bubble memory element has a minor loop 1 as shown in Figure 1.
a, 1b, ......, 1n, gate 2, major line 3, minor loop 1a,
The bit information contained in 1b, . In this case each minor loop 1a, 1
It has a defective bit information storage page 4 that stores bit information indicating whether or not b, ......, 1n is a defective loop, and checks whether each minor loop is a defective loop during operation. There is.

Conventional magnetic bubble memory devices have used only fixed magnetic bubble memory elements, but with the development of magnetic bubble memory devices, there is an opportunity for the use of removable magnetic bubble memory elements to be developed. When a magnetic bubble memory element in which defective loop information is stored in a specific page as shown in FIG. 1 is used as a removable device, the defective loop information must be read out when power is turned on, when switching elements, and when attaching or detaching the element. In this case, if the defective loop information page is at the farthest position in terms of time from gate 2, it will take time to access it, so in order to read the defective loop information in the shortest time, defective information page 4 is
It must be in the position shown in the diagram.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for accessing a magnetic bubble memory device that reduces the access time of a removable magnetic bubble memory element in the magnetic bubble memory device.

According to the present invention, there is provided a magnetic bubble memory device in which a fixed magnetic bubble memory element and a removable magnetic bubble memory element are driven and controlled by a common control means, wherein the control means determines read/write access to the memory element. and when the selection means selects read/write access to the removable magnetic bubble memory element, the control means selects the removable magnetic bubble memory element when the read/write access is completed. An access method for a magnetic bubble memory device is proposed, which is characterized by driving and controlling a page that stores information regarding the presence or absence of a defective loop in a minor loop to a position closest to a major line gate. .

Embodiments of the magnetic bubble memory device according to the present invention will be described in detail below.

FIG. 2 shows one embodiment of the device according to the present invention, in which 11 is a CPU, 12 is an interface, 13 is a bubble control register, 14 is an element selection device, 15 is a drive circuit, 16a,... ，
16n is a fixed magnetic bubble memory element (hereinafter abbreviated as fixed element), 17a, .

In FIG. 2, information from the host is transmitted via the interface 12, bubble control register 13, and drive circuit 15 to the fixed elements 16a, . . . , 16n,
The output signal is being supplied to the cassettes 17a, . be done. By the way, when one of the cassettes 17a, . . . , 17n is selected, a selection signal is supplied to one of the cassettes 17a, . Reported.

The CPU 11 has a control flow as shown in Fig. 3 to control the fixed element and the cassette, and after a read/write operation, it is determined whether it is a fixed element or a cassette, and if it is a fixed element, it moves on to the next read/write operation. In the case of a cassette, by shifting the defective loop information page to the position shown in FIG. 1 based on the report from the cassette selection detection circuit 18, the defective loop information can be read out in the shortest possible time during attachment/detachment.

According to the present invention, even in a device in which two types of magnetic bubble memory elements, removable and fixed, are mixed, it has become possible to access the removable element, which takes about 3 seconds at most, in about 14 ms.

[Brief explanation of the drawing]

Figure 1 shows a general magnetic bubble memory element, Figure 2
The figure shows one of the magnetic bubble memory devices according to the present invention.
The block diagram of the embodiment, Fig. 3, is the same as that in Fig. 2.
This is a CPU control flowchart. In the figure, 11 is a CPU, 12 is an interface, 13 is a bubble control register, 14 is an element selection device, 14 is a drive circuit, 16a,...16n are fixed magnetic bubble memory elements (fixed elements), 17
17n is a removable magnetic bubble memory element (cassette), and 18 is a cassette selection detection circuit.

Claims (1)

[Claims] 1. A magnetic bubble memory device in which a fixed magnetic bubble memory element and a removable magnetic bubble memory element are driven and controlled by a common control means, wherein the control means controls the lead/removable magnetic bubble memory element to the memory element.
The device includes element selection means for determining write access, and when the selection means selects read/write access to the removable magnetic bubble memory element, the control means controls the removable magnetic bubble memory element when the read/write access is completed. An access method for a magnetic bubble memory device characterized by driving and controlling a page storing information regarding the presence or absence of a defective loop in a minor loop of a bubble memory element to forcibly change its position to a position closest to a gate of a major line. .