Browse Prior Art Database

On Chip Bad Bit Handling for Bubble Devices

IP.com Disclosure Number: IPCOM000050712D
Original Publication Date: 1982-Dec-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 2 page(s) / 43K

Publishing Venue

IBM

Related People

Tao, LJ: AUTHOR

Abstract

A bubble device design utilizes a bad-bit deleting switch or annihilator and a series of delay gates to delete bad bits from a string of data bits and to compress the data into all good bits.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 87% of the total text.

Page 1 of 2

On Chip Bad Bit Handling for Bubble Devices

A bubble device design utilizes a bad-bit deleting switch or annihilator and a series of delay gates to delete bad bits from a string of data bits and to compress the data into all good bits.

As shown in Fig. 1, bubbles or data transferred from a minor loop (not shown) propagate along the output channel 10 to bad-bit deleting switch 12. If the data is a bad bit, the switch 12 is activated by pulsing a current through the conductor 16 which causes the bubble to be switched into annihilation channel 18 which leads to an annihilator (not shown). Next to the switch 12 is a series of m delay gates 20. The current will also transfer the good bits on the delay gates 20 from the switch 21 onto the I-bar 22A. Each bit will propagate along the I-bars 22 and return to the original switch 21 in one cycle of rotating field. In the meantime, unprocessed bits following the bad bit continue to propagate forward one step. Thus the bad bit is deleted, and the gap vacated by the bad bit is compressed. This procedure is repeated when a bad bit reaches the deleting switch 12.

The reverse process of decompressing all good-bit data before transferring into the minor loops can be done with the design shown in Fig. 2. The process starts with all the good bits residing on the m delay gates 30. The bits are propagating into input channel element 32. When a gap is desired between the two bits at delay gate 1 and propagation element 32, the conduct...