JPS592113B2 - Magnetic bubble memory control method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control method for a magnetic bubble memory, and particularly to a method for controlling information writing to a magnetic bubble memory.

Methods for specifying the start address for reading and writing information from an information processing device to a file storage device can be broadly classified into the following two methods.

That is, in the first method, the higher-level processing unit first gives a command to the file storage device to send the start address to read or write to the file storage device, and then when it sends the read or write command, the file storage device The second method is to execute a read or write operation from the received start address.
First, the higher-level processing device gives a command to send search information to the file storage device, and then sends a read or write command, and the file storage device starts searching for stored information based on the search information received in advance. This method executes a read or write operation when a specific condition specified by a command between information and stored information is detected. Here, when using a magnetic bubble memory as a file storage device, the first method is generally used.

That is, based on the start address in the magnetic bubble memory and a read or write command, transfer out control is performed to transfer information from the minor loop to the major loop based on the start address information, and then read control is performed to read information corresponding to the start address from the major loop. Performs sense control or write generation rate control for writing to the major loop. After that, a method is used in which transfer control or the like is performed to return information from the major loop to the minor loop. These controls are executed based on the start address information, but in this case, the control information for each control is stored in a control memory, and the control information is sequentially read and updated while performing a series of controls. . Now, in such a magnetic bubble memory control method, when an attempt is made to add a function of executing a read or write operation based on search information as in the second method described above, the following problem occurs. In other words, in the magnetic bubble memory currently in common use, the physical positions of the read gate and write gate are different due to the structure of the chip. A circuit is required to detect the time when the condition is satisfied, and further monitor the time from when the storage area moves from the read gate to the write gate to when the write operation starts. Such a circuit mainly requires a counter that starts counting when a specific condition is met and counts the time until the storage area moves from the read gate to the write gate, and a control circuit that controls the counter. There is a problem that many hardware items are increasing due to the pursuit of functionality, which impairs economic efficiency. Further, since the read operation is shifted to the write operation, control means for changing these operations is also required, and there are problems such as requiring a large amount of changes to each control circuit for read and write. SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned drawbacks of the prior art and to provide a magnetic bubble memory control system that is economical and easy to control.

For this purpose, the present invention provides a means for storing various control information for controlling the magnetic bubble memory, a means for searching the contents of information read from the magnetic bubble memory and determining a specific condition, and a means for determining a specific condition. Means for rewriting the control information of the storage means based on the output information is provided, information is read from the magnetic bubble memory using the read control information of the storage means at the time of a specific command, and based on the read content, the determination means determines a specific condition. The control information stored in the storage means is rewritten by the rewriting means into control information based on a specific condition when the above is established.

Hereinafter, the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a diagram showing one embodiment of the control method according to the present invention, FIG. 2 is a schematic diagram of a memory chip for explaining the number of steps in a magnetic bubble memory, and FIG. 3 is a diagram showing control operations for the number of steps. It is a time chart. In FIG. 1, 100 is a command register, 101 is a data register, 102 is a command decoder, 103 is a control information generation circuit,
104 is a control memory, 105 is a timing generation circuit, 1
06 is a write driver, 107 is a peripheral control circuit, 108
1 is a magnetic bubble memory, 109 is a lead sensor, 110 is a specific condition determination circuit, 200 and 201 are gate groups, 301
-318 are signal lines. Also, in Figure 2, 401
is a minor loop, 402 is a major loop, 403 is a sensor, 404 is a generator, and G, h, k, l, m
, n, and p are each less than or equal to 0 and indicate the number of steps.The operation will be explained using a write operation as an example. First, an address instruction command indicating a position in the magnetic bubble memory 108 is set in the command register 100 via the input line 301 along with a startup command from the host processing device.

At the same time, address data is set in data register 101 via input line 302. Command register 10
A command set to 0 causes a signal on output line 305 by command decoder 102 via output line 303 to open the gate of gate group 201. On the other hand, data register 1
The address information set to 01 is input to the gate group 201 via the output line 304, and is input to the control information generation circuit 103 via the signal line 308. Although only one bit of gate group 201 is shown here, it is usually composed of a plurality of gates. The same applies to the gate group 200. Now, the control information generation circuit 103 that has received the address information creates control information according to the address information, and writes the control information into the control memory 104 via the output line 309. For example, if the address information received by the address instruction command at this time specifies the address of point A shown in FIG.
Write the number of steps / up to ) in the control memo J month 04. At the same time, "O" is written as status information to indicate that the information Z is information for transfer out.Subsequently, a specification for reading specific condition data of the magnetic bubble memory 108 from the upper processing unit is written. A command is received by the command register 100, and specified specific condition data is received by the data register 101.

The output of the command register 100 at this time is the decoder 102
The specific condition data generated on the decoder output line 307 and stored in the data register 101 is sent to the gate group 200.
The data is transferred to the specific condition determination circuit 110 via. At the same time, the decoder output line 307 activates the control information generation circuit 103 to write control information associated with a specific condition into the control memory 104. Next, the command register 100 receives a write command specifying a write operation as an operation specifying command from the host processing device, and the data register 101 receives write data.

This generates a signal on the output line 306 of the command decoder 102, and based on this signal, the control memory 1 storing the control information created by the previous address instruction command
The control information is read from 04, and the peripheral control circuit 107 executes control of the magnetic bubble memory 108. at the same time,
Activate a counter not shown. On the other hand, the operation designation command at this time is a write command, but since the preceding command is a specific command, that is, a command requesting a search, a pseudo read command signal is sent to the control information generation circuit 103. . Now, as shown in FIG. 3, the magnetic bubble memory 108 is driven 1 (ST),
When the control information written in the control memory 104, that is, the number of steps XZl' and the status report O'', is read out, the number of steps XZl' and the value of a counter (not shown) that increments at each step are first read out. See the match.

When a match is detected, transfer out (T
Out) signal is sent. As a result, the data group including points A and B in FIG. 2 is transferred from the minor loop 401 to the major loop 402. When transfer out is executed, the operation designation command is pseudo-read by the specific command requesting the search, so the control information generation circuit 103 sets the number of steps as control information in the control memory 104 to A on the minor loop. The number of steps from the point to the sensor 403 is rewritten as ``l+m+n''. Also, in order to indicate that this information is the transfer start timing, the status information is rewritten from ``0'' to 11''. In the same manner, the control memory 104 When the control information Z+m+n// indicating the number of steps read out matches the value of the counter that counts the number of steps, that is, when the information at point A in FIG. Data including information on point A in I river 08 is read (R) via signal line 315.

Also, the control information in the control memory 104 at this time is
+G7 (g is the number of steps in one rotation on the major loop 402), that is, the information of point A in the minor loop 401 is transferred in one rotation on the major loop 402 (
Tln), and the status information changes from ``1'' to ``2'' indicating the transfer timing.
'5. On the other hand, data read by the read sensor 109 is transferred to the specific condition determination circuit 110 via the signal line 316. This determination circuit 110 checks the match between the specific condition data transferred by the previous specific command and the data transferred by the read sensor 109, and when a match is detected, activates the control information generation circuit 103 via the output line 317. . The activated control information generation circuit 103 outputs the detected data to the generator 40.
4, the control information in the control memo I month 04 is rewritten to the number of steps (counter value)+p'/ at the time when the X match is detected. For example, if a match is detected k steps after the information at point A in FIG. The information is rewritten from ゜27 indicating the transfer timing to 81'' indicating the transfer start timing. By performing this control, the value of the counter (not shown) and the content of the control memory 104 match again after timing p from the time when the specific condition was determined, and the peripheral control circuit 107 is activated from that point on. .

Also, the write driver 106 is started based on the timing of the timing generation circuit 105, and the write data set in the data register 101 is transferred to the magnetic bubble memory 1.
Write to 08 (W). After reaching the transfer start timing (write timing), the number of steps until the content of the control memory 104 is transferred (Tin) again is ゞZ+g'', and the status information is rewritten from ゜11 to も2''. When the transfer timing is reached, the contents of the control memo I river 04 are rewritten to the number of steps Sg+H2 (h is the number of steps for one rotation on the minor loop 401) and the status information is rewritten from X2 to X3.

When the stop timing is reached, the control operation is completed and the drive of the magnetic bubble memo I river 08 is stopped (SP). In addition,
In the above explanation, timing monitoring is performed by a counter (not shown) that advances in synchronization with the rotation of the bubble, and a circuit that detects a match between the value of this counter and control information indicating the number of steps in the control memory 104. be done. Above, we have described the case where the third command, the operation specification command, is a write command, but if the command at this time is a read command, the control memo 1 river 0
The control information of No. 4 is configured in advance so that it continues with the read operation of specific condition data without being rewritten into control information for the write operation.

As explained in detail above, according to the present invention, since the control circuit is made to depend on the information in the control memory at the time of one specific command to the magnetic bubble memory, the control information stored in the control memory cannot be rewritten. This allows for easy function changes.

In addition, only a small amount of dedicated hardware is required to implement the search function, and a control circuit that integrates control during reading and writing can be implemented, making it possible to realize an economical and easy-to-control device.

[Brief explanation of the drawing]

FIG. 1 shows one of the magnetic bubble memory control methods according to the present invention.
Figure 2 is a schematic diagram of a memory chip to explain the number of steps of the magnetic bubble memory, and Figure 3 is a time chart showing control operations for the number of steps. Register, 101...
・Data register, 102...command decoder,
103... Control information generation circuit, 104...
...Control memory, 105...Timing generation circuit, 106...Write driver, 107...
... Peripheral control circuit, 108 ... Magnetic bubble memory, 109 ... Read sensor, 110 ...
...Specific condition judgment circuit, 200, 201...
Gate group, 301-318...Signal line, 401
...minor loop, 402...major loop, 403...sensor, 404...
・Generator, G, h, k, l, m, n, p...
...Number of steps.

Claims (1)

[Claims] 1. In a control device for a magnetic bubble memory, a means for storing control information for controlling the magnetic bubble memory, a means for searching information read from the magnetic bubble memory and determining a specific condition, and a result of the determination means. means for changing the control information of the storage means based on the control information of the storage means, reads information from the magnetic bubble memory according to the control information of the storage means at the time of a certain command, and determines a specific condition from the read information by the determination means. 1. A magnetic bubble memory control method, characterized in that when the determination is made, the change means changes the control information in the storage means to control information based on the determination result.