JPS5856281A - Processing system for defective loop information of magnetic bubble memory - Google Patents

Abstract

PURPOSE:To assure the process of a defective loop and the page control, by storing the defective loop data of plural blocks of the same contents into a boot loop and adding an address and a mark showing the defective loop data to each block. CONSTITUTION:A format is used as a defective loop data which is written into a boot loop BL storing the information on the defective loop. At the same time, FFFFFFFF of 4 times of an FF is selected as a mark showing a defective loop data. Then plural defective loop data of the same contents are written in plural blocks, and the number (address) showing the order of the relevant block and the defective loop data are written. In such way, a defective loop is processed quickly to attain the assured page control.

Description

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

- Generally, in magnetic bubble memory, the occurrence of unusable defective loops due to manufacturing reasons is unavoidable.
A boot loop that stores all the information about the bad loop is provided separately from the entire data loop, and based on the data stored in this boot loose, the bad loop is detected. (Z)

In this case, each bit of the boot loop &:t loop rotates in synchronization with all data loose bits, so there is no defective loop data! 4i1 is inserted in the first bit position.'': Page management of liter loose is performed.

By the way, in the conventional magnetic bubble, only 20 pieces of bad loop data are stored in one block, so the leading bit polarization of the bad loop data in the boot loop is 1tl. In the worst 15th case, there is peace of mind to read all the boot loops.
There was a problem that #tl was required.

The main purpose of the present invention is to quickly correct defective loops based on the idea of storing multiple blocks of defective loop data with the same content in view of the problem 1 of the conventional method. Can you handle the force-one address on the block? It is an object of the present invention to provide a method for processing defective loop information in a magnetic bubble memory, which can ensure complete page management.

In the present invention, in a magnetic bubble memory having a complete boot loop, defective loop data of a plurality of blocks having the same contents are stored in the boot loop, and each block is marked with a mark indicating that it is defective loop data. Have you set up an address field that indicates whether the data is in the next block? A method for processing defective loop information of a defective loop in a magnetic bubble memory is provided.

FIGS. 1 and 2 show a method for processing defective loop information in a magnetic bubble memory as an embodiment of the present invention.

This will be explained below with reference to FIG.

FIG. 1 is a diagram showing an example of a magnetic bubble memory equipped with a boot loop BLi. FIG. 2 shows a processing circuit for defective loop information, and FIG. 3 shows a format H- for defective loop data.

In FIG. 1, one boot loop BL and 598 ty>data loops are provided, and each loop is filled with 2052 bits of data. In the boot loop and all data loops, all bits rotate synchronously throughout the loop, and page management is performed by the bit position of the putrouse.

In the boot loop shown in Fig. 1, data is loaded and read by the circuit shown in Fig. 2. In the circuit shown in Fig. 2, the controller 1, faulty lube data storage RAM 2, Circuit 3, shift register 4.4
A bart "FJ-" verification circuit 5, an 8-bit counter 6, a sense circuit 7, a generator 8, and a footloop 9 are provided. If a defective loop data is inserted into the boot loop, the format shown in the figure "K1ft" is used. ""Fi"' (11111111) is 4 in the data
1i”F FFFF B'l
The selection is 7I.

Therefore, other Cheetah mushrooms may not be mistakenly marked.

Since multiple blocks of bad loop data with the same data content are written during a put loop, is the block the current block? The block number (address) is placed after the mark to indicate the address. Next, the number of defective loops is sequentially written up to a maximum of several m.

In Figure 2, is n the address of the defective loop? Number of bytes required to represent, k block) No. 6? The number of bytes required for a hailstorm, m is the maximum number of bad loops.

When writing the data of the defective loop described above, the controller 1 stores information on the defective loop f - evening storage R
The data is written to AM2, and the data is transferred to the shift register 4vC every 8 bits by the 8-bit counter 6, and converted into serial data. This serial data is transmitted to the generator and the boot loop VC is omitted.

Bad loop data? When reading, the serial data sent from the sense circuit 7 is converted into parallel data in the full shift register 4, and checked by a 4-byte "FF" verification circuit for a trench that matches the mark. When it matches the mark, the 8-bit counter 6 is activated and the data is sent from the shift register 4 to the defective loop data storage AM2 every 8 bits. In this case, depending on the block number, if the bit position of that block is off, If w
This allows for reliable page management of the loop. Moreover, since a plurality of blocks of defective loop data are written in the loop, the defective loop data r missing in the loop can be found more quickly, and the time required to read the defective loop data can be shortened.

According to the present invention, all bad loops can be quickly handled, and page management? A method for processing bad loop information in magnetic bubble memory that can perform reliable VC can be provided.

[Brief explanation of drawings]

Fig. 1 is a general configuration diagram of a magnetic bubble memory equipped with loops, and Fig. 2 is a data processing circuit using a defective loop information processing method of a magnetic bubble memory as an embodiment of the present invention. Circuit diagram, J! , 31] is a diagram showing the format of defective loop data used in the circuit of FIG. 2. (Explanation of symbols) 1: Hunt roller, 2: Defective roof data storage RA
M, Self: R/W switching circuit, 4: Shift register, 5: 4-byte "PF"" verification circuit, 6: 8-bit counter, 7: Sense circuit, 8 Nigenerator, 9 Nib-Droop. Patent applicant Fujitsu % Patent Attorney Patent Attorney Akira Aoki Patent Attorney Kazuyuki Nishidate (1) Yukio Patent Attorney Akiyuki Yamaguchi (7)

Claims (1)

[Claims] In a magnetic bubble memory equipped with a footloop, defective loop data of multiple blocks with the same contents are assigned to the bootloose, and each block is marked with a purple mark indicating that it is defective loop data, and the number of the defective loop data is indicated. A method for processing defective loop information in a magnetic bubble memory, characterized in that an address is provided that indicates whether the block is a block or not.