JPS633040Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic bubble memory module, and more particularly to a magnetic bubble memory module having positive and negative terminals for writing to a boot loop.

Generally, in a magnetic bubble memory, a module containing a certain number or less of defective loops can be saved by performing redundancy processing. In order to perform redundant processing, it is necessary to retain defective loop information by some means, but recently, many methods have been adopted for storing defective loop information directly in the magnetic bubble memory itself. At that time, defective loop information is stored in a specific loop called a boot loop. The boot loop is provided with a write gate for writing defective loop information and a read gate for reading it.

Since defective loop information is written to and read from the boot loop in the module state, terminals for driving these gates must be provided in the module. FIG. 1 shows an external view of a conventional magnetic bubble memory module. terminal 1,
2 is the gate positive/negative terminal for writing to the boot loop,
Terminals 3 and 4 are gate positive and negative terminals for reading from the boot loop. The other terminals are used for functional parts such as a generator and a detector, a coil for applying a rotating magnetic field, and the like. By the way, since information on defective loops extracted by the manufacturer is written in the boot loop, the user only uses the boot loop read gate terminals 3 and 4, and there is no need to normally use the write gate terminals 1 and 2. do not have. However, as shown in FIG. 1, if the boot loop write terminals 1 and 2 are provided in the module in the same shape as other terminals, there is a risk that an unintended voltage will be applied and the boot loop data will be rewritten.

One possible solution is for the manufacturer to cut out the write terminals 1 and 2 after writing to the boot loop, but this method is not preferred for the following reasons. If the module is accidentally exposed to an environment that exceeds the information retention limit, such as abnormally high or low temperatures, or an excessive external magnetic field, the boot loop data will of course be destroyed, but if the module is returned to a normal environment, it will be destroyed. , by rewriting the bootloop,
The module can then be used again. Therefore, in consideration of such a case, it is necessary to leave the write function even after writing to the boot loop during manufacturing, and terminals 1 and 2 cannot be cut off.

An object of the present invention is to provide a magnetic bubble memory module in which write protection to the boot loop can be sufficiently achieved and the write protection can be canceled when unavoidably necessary.

The present invention is achieved by electrically shorting the positive and negative terminals of the boot loop write gate.

Next, embodiments of the present invention will be described using the drawings. FIGS. 2 and 3 are external views of the magnetic bubble memory module according to this embodiment. As shown in FIG. 2, the boot loop write gate terminals 1 and 2 of this module are provided with projections 11 and 12 at positions where both terminals face each other. Projection 11,1
Since the tips of 2 are not in contact with each other, it is possible to write to the boot loop in this state. After writing predetermined defective loop information, the gap between both protrusions is electrically shorted via solder 13, as shown in FIG. By doing so, even if an unintended voltage is subsequently applied between terminals 1 and 2, no current will flow to the write gate for go-to loop and the boot loop data will not change.

Furthermore, even if the module is exposed to an abnormal environment as described above and the boot loop data is destroyed, it can be rewritten by removing the solder 13. After writing is completed, press the protrusion 1 again.
By electrically shorting between 1 and 12 with solder, subsequent retention of boot loop data is guaranteed.

In this example, the electrical short state was ensured by placing the protrusion on the terminal and soldering it. However, the protrusion is not necessarily necessary, and the present invention can also be achieved by soldering via other metal wires. It is clear that this objective will be achieved.

As explained above, according to the present invention, the reliability of boot loop data retention is increased, and it is extremely useful industrially.

[Brief explanation of the drawing]

FIG. 1 is an external view of a conventional magnetic bubble memory module, and FIGS. 2 and 3 are external views of a magnetic bubble memory module according to an embodiment of the present invention. In the figure, 1, 2... write gate terminal for boot loop, 3, 4... read gate terminal for boot loop, 11, 12... terminal protrusion, 13
...Solder connection.

Claims (1)

[Scope of utility model registration request] A plurality of external lead-out terminals connected to the input part of the boot loop in which defect information of the magnetic bubble memory is written are connected between the plurality of external lead-out terminals outside the container containing the magnetic bubble memory and in the vicinity of the container. 1. A magnetic bubble memory module comprising a short-circuiting solder.