JPS59171096A - Magnetic bubble memory device - Google Patents

Abstract

PURPOSE:To execute simply and easily the inspection of a magnetic bubble memory device by providing the inside of a device with an inspecting function. CONSTITUTION:A specified data pattern is generated from a write data generating part 213 responding to a controlling circuit 202, and written directly in a magnetic bubble memory module 204 and 205 through a peripheral circuit 203. This pattern is read out, stored in a read data buffer 214, a stored data and a pattern from the generating part 213 are compared by an error detecting part 215, and at the time of dissidence, an error signal is generated. By an inspecting function provided in the inside of this device, an inspection of a magnetic bubble memory device is executed simply and easily.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a magnetic bubble memory device, and particularly to a magnetic bubble memory device having a magnetic bubble module testing function.

FIG. 1 shows the configuration of a general magnetic bubble memory device.

In general, the magnetic bubble memory device 100 includes one or more (two in FIG. 1) magnetic bubble modules 104, 105 and a direct converter that generates various current waveforms to operate the magnetic bubble modules and converts bubble signals into digital signals. Peripheral circuit 103, current waveform generation timing, read data,
Control circuit 1 that controls transfer of write data, etc.
Consists of 02.

The general operation of the magnetic bubble memory device will be described below. Magnetic bubble memory devices are commonly used as external storage in some systems. When writing data from the main unit 101 of the system to the magnetic bubble modules 104 and 105, the main unit 101 sends a signal 107 for selecting a magnetic bubble memory device to a specific magnetic bubble memory device 10.
After selecting 0, the command, bubble address, data size, etc. are sent to the control circuit 102 via the data bus 106.

The control circuit has means for temporarily storing this information, and the information sent from the main device 101 is stored in the temporary storage section. When the control circuit 102 determines that the command sent from the main device is a write command, it receives write data from the main device v101 via the data bus 106. The control circuit 102 directly transmits the timing of the current pulse necessary to operate the bubble to the peripheral circuit 103 via the signal line 1.
Send via 08.111. The direct peripheral circuit 103 generates a current pulse for a pull-in operation at the timing sent from the control circuit 102, and writes data into the magnetic bubble modules 104 and 105 through the signal line 110.

Further, when reading data from a magnetic bubble module from a magnetic bubble memory device to the main device, a signal for selecting a magnetic bubble memory device is sent from the main device 101 through 107, and after selecting a specific magnetic bubble memory device 100, a signal is sent via the data bus 106. The command, bubble address, data size, etc. are stored in the temporary storage section of the control circuit 102. When the control circuit 102 determines that the command sent from the main device 101 is a read command, the control circuit 102 directly sends the timing of the current pulse to the peripheral circuit through the signal line 108. The direct peripheral circuit 103 generates a current pulse for the read operation at the timing sent from the control circuit 102 and sends it to the magnetic bubble module 10 through the signal line 110.
4,105 is driven. At this time, magnetic bubble module 1
The bubble signal generated at 04 and 105 is directly sent to the peripheral circuit 103 through the signal line 112, amplified, and converted into a digital signal. The bubble signal is sent to the control circuit 02 through a signal line 109 and sent to the main device 101 at an appropriate timing.

The conventional magnetic bubble memory device described above has the following drawbacks. If there is an error in the data read from the magnetic bubble memory device, the user of the magnetic bubble memory device will need to inspect the magnetic bubble memory module. If the user has a dedicated magnetic bubble memory module inspection device, the user can remove the magnetic bubble memory module from the magnetic bubble memory device and inspect the bubble module to determine if it is a defective module. can do. If the user does not have a dedicated testing device, it is necessary to provide testing means for the magnetic bubble memory module in the main device. In any case, the user must have inspection means, which places a heavy economic burden on the user and makes maintenance of the device difficult.

The present invention has been made to solve the above-mentioned drawbacks.

The magnetic bubble memory device according to the present invention has a function to test the magnetic bubble memory module within the magnetic bubble memory device.

Therefore, in the magnetic bubble memory device according to the present invention, the magnetic bubble memory module can be tested by simply sending a test command via the data bus in the same way as injection commands and read commands while connected to the main device.

The present invention will be explained in detail using specific examples.

One specific example of the magnetic bubble memory device according to the present invention is shown in FIG. 1 The magnetic bubble memory device according to the present invention is 1
or more magnetic bubble memory modules 204, 205 (
(Figure 2 shows the case of two) and a direct peripheral circuit 203 that generates various current waveforms to operate the magnetic bubble memory module and converts the bubble signal into a digital signal.
and a control circuit 202 that controls the generation timing of current waveforms and the transfer of read, read data, write data, etc.
and a write data stamp generation means 213 that generates a specific data pattern for inspection; a read data buffer 2]4 that temporarily stores read data; and an error detection means for generating a time error signal.

The 1-ta pattern generating means needs to be generated also during reading in order to compare with read data.

The simplest example is a method in which a specific pattern for testing is written in advance in a memory, and the pattern is generated in synchronization with a write pulse or a read pulse. Another specific example is 1.・There is a method using Jista and Ensho 4 instruments. Initial data, for example, 00 in hexadecimal (afterwards, 7 is displayed in hexadecimal and H is added to the end of the value) is set in the register, and OIH is added every 8 write pulses to obtain 00H.

01) 1.02) (...... FEH, ppH data patterns can be generated. This can also be done in the read operation by using the same procedure to generate the same pattern sequence as the write data. If a microcomputer is used in the control circuit 202, it is possible to use registers and arithmetic units inside the microcomputer.The read data buffer temporarily stores the data read from the bubble. In the buffer, for example R
Consists of A.M.

As the error detecting means, for example, a data comparator of a normal logic gate can be used. Furthermore, if a microcomputer is used for the control circuit 202, this can be easily achieved using registers and comparison instructions inside the microcomputer.

The operation of the magnetic bubble memory device according to the present invention will be described below.

Since reading and writing operations to a normal bubble memory module can be performed in the same manner as before, the explanations will be omitted.

The user can test the magnetic bubble memory device in the mounted state as soon as the bubble module is tested.

The main device sends a signal to select the magnetic bubble memory device to be tested through the signal line 207, and selects the magnetic bubble memory device to be judged. Commands, addresses of bubbles to be inspected, etc. are sent via the data bus 206. When the magnetic bubble memory device receives the command and determines that the command is a test command, it begins a write operation. The omitted data at this time is
A specific pattern for inspection generated by the data pattern generation means 213 is used. The write operation is no different from a normal write operation except that the data button is a specific one. 1. When a specific data button is written to the bubble address to be inspected, the read operation is automatically performed. Move to. The read operation is also the same as the normal read operation, but in parallel, a write data stamp is generated from the data stamp generating means 213. This is the same data that has already been written to the bubble. The read data is stored in the temporary storage means 214 and the error detection means 21
5 via signal line 218. On the other hand, the input data button is sent to the error detecting means 215 via the signal line 216.
The data stamp sent and written is compared with the read data to determine whether they match. When they do not match, a mismatch flag is generated on the signal line 216. The test instruction ends when all the bubble addresses to be tested have been tested. The user checks the status of the signal line 216 via the main device, and if 7 lags of inconsistency are present, it can be determined that the inspected module is defective.

As explained above, according to the magnetic bubble memory chain according to the present invention, since the magnetic bubble memory device itself has the inspection function of the magnetic bubble memory module, it is possible to realize a system that is easy to maintain. In a bubble memory device, the amount of metal required for the inspection function is not so large. If a microcomputer is used for the control circuit, the specific data stamp generation means and error detection means for the test can be realized using registers and arithmetic units inside the microcomputer. For the deep read data buffer, it is sufficient to use the same one that stores normal read data or to increase it slightly.

In the magnetic bubble memory device according to the present invention, since the magnetic bubble memory device itself has a testing function, the testing device for production can be simplified, and a low-cost magnetic bubble memory device can be realized.

As explained above, according to the present invention, it is possible to realize a magnetic bubble memory device that is low in cost and easy to maintain, and therefore has great effects.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an example of a conventional magnetic pull memory device, and FIG. 2 is a block diagram showing an example of a magnetic bubble memory device according to the present invention. 101...Main device, 102, 202...
・Control circuit, 1.03, 203... Direct peripheral circuit, 104, 105, 204° 205... Magnetic bubble memory module, 214... Read data buffer, 219. ...Write data generation section, 215...Error detection section, 106゜107
．． 108, 109, 111, 112, 206, 207,
208°209.210,211,212,216,2
17,218...Signal line.

Claims (1)

[Claims] In a magnetic bubble memory device having one or more air bubble memory modules, a drive circuit for operating the magnetic bubble memory module, and a control circuit for controlling the timing of drive pulses applied to the drive circuit and data transfer, Comparing a means for generating a specific data stamp, a means for temporarily storing data read from a magnetic bubble memory module, the small number of read data, and a write data stamp generated by the data stamp generating means. 1. A magnetic bubble memory device comprising an erroneous error detection means for generating an erroneous error signal if there is a mismatch.