Browse Prior Art Database

Magnetic Core Memory

IP.com Disclosure Number: IPCOM000090807D
Original Publication Date: 1969-Jul-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 49K

Publishing Venue

IBM

Related People

Counihan, RG: AUTHOR [+2]

Abstract

A critical factor in the operation of large capacity magnetic core memories is noise in sense lines. Prior solutions to sense line noise include the segmenting of such sense lines. This method segments the drive lines in mutually exclusively operated portions of the memory. A single sense line threads all portions of the memory in such mutually exclusively operated portions, one sense line for each digit in the memory system. The method also reduces the number of sense amplifiers required to operate the magnetic core memory.

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Magnetic Core Memory

A critical factor in the operation of large capacity magnetic core memories is noise in sense lines. Prior solutions to sense line noise include the segmenting of such sense lines. This method segments the drive lines in mutually exclusively operated portions of the memory. A single sense line threads all portions of the memory in such mutually exclusively operated portions, one sense line for each digit in the memory system. The method also reduces the number of sense amplifiers required to operate the magnetic core memory.

Two mutually exclusively operated memory array portions 10 and 11 are shown as having six bit planes representing storage of six-bit words. The internal wiring of portions 10 and 11 is conventional. Portion 10 has a set of six Y1 drivers for driving the cores in the Y direction through a set of six Y1 drive lines constructed in accordance with known techniques and terminating, for example, in ground bus 12. Portion 11 has a set of six Y2 drivers respectively driving a set of six Y2 drive lines which terminate in ground bus 13.

The operation is such that Y1 drivers are activated to the mutual exclusion of the activation of the Y2 drivers and vice versa. The X1 and X2 drive lines and drivers, respectively for memory portions 10 and 11 are operated in a similar manner and are not shown.

A set of six sense lines 14 is threaded through memory portion 10 with one end grounded, for example. Sense lines 14 are connected to a simi...