JPS5846792B2 - magnetic bubble cassette memory - Google Patents

Description

[Detailed description of the invention] field of invention The present invention relates to magnetic bubble cassette memory.

2. Description of the Related Art Magnetic storage devices such as magnetic drums, magnetic disks, and floppy disks have been known as devices for storing data processed by electronic computers or terminal devices.

Recently, a magnetic bubble memory is being developed as one of this type of memory.

Magnetic bubble memory has advantages over conventional magnetic storage devices such as those described above, such as higher storage density and higher reliability since there are no mechanically moving parts.

Taking advantage of these advantages, it is being considered to use magnetic bubble memory in the form of a cassette.

However, although magnetic drums and magnetic disks each have a built-in clock track for synchronizing writing and reading, when a magnetic bubble memory is made into a cassette, the problem is how to generate a clock.

Purpose of the Invention The object of the present invention is to provide a magnetic bubble cassette memory that can be easily used and that can be operated at the standardized optimum frequency of the cassette memory without being influenced by the clock used in an external circuit. Our purpose is to provide magnetic bubble cassette memory.

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention incorporates an oscillator with an optimum frequency into a magnetic bubble memory formed into a cassette, thereby facilitating the standardization of the cassette and its usage.

Embodiment of the Invention In an embodiment of the present invention, a magnetic baffle memory is made into a cassette.

A circuit block diagram thereof is illustrated.

In the drawing, the bubble transfer roof 10 is made by depositing ferrite on garnet, for example, and forming a T-bar (
T1) A loop is formed by a series of patterns.

The magnetic bubble moves on the pattern by applying a rotating magnetic field according to this pattern.

In other words, just like a shift register, this T-bar pattern corresponds to 1 bit of the shift register, and 1 bit of data is displayed as ``1'' or ``O'' depending on whether or not there is a bubble in this pattern.

Permanent magnets 9 and 11 sandwich the bubble transfer loop 10 on the garnet from both upper and lower surfaces, and shade the bias magnetic field for holding the magnetic bubbles in the bubble transfer loop 10.

The baffle detector 6 is a detector that detects bubbles that are data on the bubble transfer loop 10. If there is a bubble (information), it expands the bubble and converts the magnetism into an electric signal.

The bubble extinguisher 7 extinguishes bubbles on the loop when new information is written onto the bubble transfer loop 10 or when all data is erased.

Bubble generator 8 applies current to generate baffles in order to write information onto bubble transfer loop 10 .

The read amplifier 3 detects the presence or absence of a bubble by expanding the bubble on the bubble transfer roof 10 and converting magnetism into electricity.

In the read amplifier 3, the detected weak signal is amplified and converted into a digital signal.

The erasing amplifier 4 drives a bubble extinguisher 7 for erasing bubble information on the bubble transfer roof 10.

The write amplifier 5 drives a bubble generator 8 for writing data, ie, bubbles, onto the bubble transfer loop 10.

The oscillator 21 generates a clock with a constant period, and this clock is given to the timing generator 14.

The timing generator 14 generates a timing signal based on the clock from the oscillator 21, and this timing signal is supplied internally, ie, to the control unit 13, the read amplifier 3, the write amplifier 5, the erase amplifier 4, the read register 2, etc. Ru.

Further, this timing signal is supplied to a rotating magnetic field drive circuit 12 in order to supply a rotating magnetic field to the magnetic bubble transfer loop 10.

Further, for synchronization of the write/read control signal 16, a signal synchronized with the rotating magnetic field is supplied to the outside as a clock 18.

The control unit 13 writes a head signal (code) and a sector signal on the bubble transfer loop 10, and controls writing and reading of data on this loop 10.

The status signal 15 is used for setting the off period, and is sent to the magnetic bubble transfer loop 10 as a head signal 19 or a sector signal 22.
This is a signal that sets the state when writing data, etc., and distinguishes it from the normal data reading and writing state.

Write data for the write data signal 16 is input from this terminal.

The write/read control signal 17 controls whether writing or reading is performed by the state of this signal, ie, "011" or "1".

The rotating magnetic field driving circuit 12 includes a coil that applies a rotating magnetic field to the horizontal plane of the magnetic bubble transfer loop 10, and a rotating magnetic field driving current is passed through this coil to generate a rotating magnetic field.

One rotation shifts one pattern of T or ■.

The read register 2 is a multi-bit register from which data stored in the bubble transfer roof 10 is read and temporarily stored, and this data is output as read data 20.

Special pattern detector 1 is bubble transfer loop 1
Among the data stored in 0, special patterns such as a start signal indicating the start of data or a sector signal indicating a sector, i.e., a special code consisting of multiple bits, such as 2 bytes all II 11+, are detected. do.

This is detected when the read data comes to the read register 2, and when the first signal is detected, the first signal becomes "1'', and when the sector signal is detected, the sector signal 22 becomes 1".
1 I+.

There are frequency characteristics of rotating magnetic field generation circuits, magnetic bubble transfer loops, and other frequency characteristics, and when these are used, it is better to have them built as a single ruler, and the person who makes it and uses it. It's also easy to use.

Furthermore, when considering a wide range of uses as a cassette, it is most important to standardize the memory device, and it is necessary to create a system that is easy to do this.

As explained above, this invention has a structure in which an oscillator and a timing generation circuit are built in, and an internal electric signal is taken out to the outside, so that a clock signal synchronized with the outside can be obtained in a simple manner. .

[Brief explanation of drawings]

The drawing is a conceptual explanatory diagram of a magnetic bubble cassette memory to which the present invention is applied. Explanation of the symbols: 1 is a special pattern detector, 2 is a read register, 3 is a read amplifier, 4 is an erase amplifier, 5 is a write amplifier, 6 is a bubble detector, 7 is a bubble extinguisher, 8 is a bubble generator, 9 is a permanent magnet, 10 is a bubble transfer loop, 11 is a permanent magnet, 12 is a rotating magnetic field drive circuit, 13 is a control unit, 14 is a timing generator, 15 is a status signal, 16
17 is a write data signal, 17 is a write/read control signal, 18 is a clock, 19 is a start signal, 20 is read data, 21 is an oscillator, and 22 is a sector signal.

Claims (1)

[Claims] 1. A magnetic bubble chip, a permanent magnet that applies a bias magnetic field to hold magnetic bubbles in a magnetic bubble transfer loop of the magnetic bubble chip, and a rotating magnetic field driving means that generates a rotating magnetic field to transfer the magnetic bubbles. It includes an amplifier for driving the magnetic bubble chip, an oscillation means for generating a clock to generate synchronization timing supplied to the amplifier and the rotating magnetic field drive means, and has a terminal for connection with the outside. Magnetic bubble cassette memory characterized by: