JPS6052515B2 - Processing method for magnetic bubble memory defective loop information - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for processing defective loop information in a magnetic bubble memory, and more particularly to a method for processing defective loop information in a magnetic bubble memory that stores defective loop data of a plurality of blocks having the same content.

Generally, in magnetic bubble memory, the occurrence of unusable defective loops due to manufacturing reasons is unavoidable.
A boot loop in which information about defective loops is stored is provided separately from a data loop, and based on the data stored in this boot loop, defective loops are avoided and used. In this case, since each bit of the boot loop rotates in the loop in synchronization with the bit of the data loop, page management of the data loop is performed based on the first bit position where the defective loop data is written.
By the way, in the conventional magnetic bubble, since only one block of defective loop data is stored, in the worst case, the boot It is necessary to read all bits of the loop, reading bad loop information,
There was a problem that it took a long time to write.

The main object of the present invention is to take into account the problems of the conventional method, and to process defective loops quickly and correctly based on the idea of writing multiple blocks of defective loop data with the same content. An object of the present invention is to provide a method for processing defective loop information in a magnetic bubble memory, which can ensure page management by providing addresses in blocks.

In the present invention, in a magnetic bubble memory equipped with a boot loop, defective loop data of a plurality of blocks having the same content is stored in the boot loop, and each block is marked with a mark indicating that it is defective loop data. A method for processing defective loop information of a defective loop in a magnetic bubble memory is provided, which is characterized in that an address indicating the block number of the loop data is provided.

A method for processing defective loop information in a magnetic bubble memory as an embodiment of the present invention will be explained below with reference to FIGS. 1, 2, and 3.

FIG. 1 is a diagram showing one side of a magnetic bubble memory with a boot loop BL.

FIG. 2 shows a processing circuit for defective loop information, and FIG. 3 shows the format of the defective loop data. In FIG. 1, one boot loop BL and 598 data loops DL are provided, and 2052 bits of data are written in each loop.

In the boot loop and all data loops, all bit loops are rotated synchronously, and page management is performed according to the bit position of the boot loop. The boot loop shown in Fig. 1 has data written by the circuit shown in Fig. 2,
Reading is performed. In the circuit shown in Fig. 2, a controller 1, a defective loop data storage RAM 2, an R/W switching circuit 3, a shift register 4, a 4-byte FF collation circuit 5, an 8-bit counter 6, a sense circuit 7, a generator 8, a boot A loop 9 is provided.The format shown in Fig. 3 is used as the defective loop data written to the boot loop.The mark indicating defective loop data is 2 bytes of defective loop data. 66FF1 (11111
111) cannot continue four times, so FFFFFFFF
F is selected. Therefore, other data will not be mistakenly determined to be a mark. During a boot loop, multiple blocks of defective loop data with the same data content are written, so a block number (address) is written after the mark to indicate the number of the block. .

Next, the numbers of defective loops are written in order up to a maximum of several m. In FIG. 2, n is the number of bytes required to represent the address of a defective loop, k is the number of bytes required to represent the block number, and m is the maximum number of defective loops. When writing the data of the defective loop mentioned above,
The controller 1 first writes information into the defective loop data storage RAM 2, and the 8-bit counter 6 transfers the data in units of 8 bits to the shift register 4, where it is converted into serial data. This serial data is transmitted to the generator and written into the boot loop. When reading defective loop data, the serial data sent from the sense circuit 7 is converted into parallel data in the shift register 4, and checked in the 4-byte FF collation circuit until it matches the mark.

When it matches the mark, the 8-bit counter 6 is activated and data is sent from the shift register 4 to the defective loop data storage RAM 2 every 8 bits. In this case, it is possible to know the bit position where the block is written based on the block number, and thereby the page management of the loop can be performed reliably. Furthermore, since the defective loop data of a plurality of procs are written in the boot loop, the defective loop data can be found more quickly in the loop, and the time required to read the defective loop data can be shortened. According to the present invention, it is possible to provide a defective loop information processing method for a magnetic bubble memory that can quickly process defective loops and ensure page management. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a general configuration diagram of a magnetic bubble memory with a boot loop, and FIG. 2 is a diagram of a magnetic bubble memory using a defective loop information processing method as an embodiment of the present invention. Circuit diagram of data processing circuit, Figure 3,
FIG. 3 is a diagram showing a format of defective loop data used in the circuit of FIG. 2;

Explanation of symbols, 1: Controller, 2: Defective loop data storage, 3: R/W switching circuit, 4: Shift register,
54 bytes "FF" verification circuit, 6: 8-bit counter, 7 license circuit, 8: generator, 9: boot loop.

Claims (1)

[Claims] 1 In magnetic bubble memory with boot loop,
A plurality of blocks of defective loop data having the same content are stored in the boot loop, and each block is provided with a mark indicating that it is defective loop data and an address indicating the block number of the defective loop data. A method for processing defective loop information in a magnetic bubble memory, characterized by: