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Interlocking Segmentation of Large Memories

IP.com Disclosure Number: IPCOM000098588D
Original Publication Date: 1959-Apr-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Booth, RR: AUTHOR

Abstract

In a standard magnetic core memory array, each plane of cores is provided with a single sense line and a single inhibit line, common to all cores in the plane. When an inhibit line is activated, all cores in its plane experience a half select current, and noise from each core is induced in the common sense line. In large memories, the combined noise of the several cores is great enough to drive the associated sense amplifier well into saturation, necessitating a substantial time delay between writing and reading to permit the amplifier to recover. This noise has been reduced and recovery time shortened by segmenting either the sense or the inhibit lines, or both.

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Interlocking Segmentation of Large Memories

In a standard magnetic core memory array, each plane of cores is provided with a single sense line and a single inhibit line, common to all cores in the plane. When an inhibit line is activated, all cores in its plane experience a half select current, and noise from each core is induced in the common sense line. In large memories, the combined noise of the several cores is great enough to drive the associated sense amplifier well into saturation, necessitating a substantial time delay between writing and reading to permit the amplifier to recover. This noise has been reduced and recovery time shortened by segmenting either the sense or the inhibit lines, or both.

The drawing illustrates an interlocking type of segmentation, which provides maximum noise reduction for a given number of segments. In an interlocking system, several separate sense and inhibit segments are provided for each plane. If four segments are used, each sense line is, threaded through the cores of one fourth the total number of rows and each inhibit line is threaded through the cores of one fourth the total number of columns, at right angles to the sense lines. Thus, only one sixteenth of the cores in a plane are common to one sense segment and one inhibit segment. A greater or lesser number of segments may be employed as required for a specific application.

Splitting the sense lines into side by side rectangular segments also serves to enhance the e...