Browse Prior Art Database

Sense Line Gating

IP.com Disclosure Number: IPCOM000097402D
Original Publication Date: 1962-Nov-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 3 page(s) / 35K

Publishing Venue

IBM

Related People

Mahrous, H: AUTHOR

Abstract

Sense line gating allows a single sense amplifier to service the several sense line segments within a memory plane. During any memory reference, all gates but one are inhibited. The gate which is not inhibited connects its related sense line segment to the sense amplifier.

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Sense Line Gating

Sense line gating allows a single sense amplifier to service the several sense line segments within a memory plane. During any memory reference, all gates but one are inhibited. The gate which is not inhibited connects its related sense line segment to the sense amplifier.

The drawing shows the general layout of a memory plane with segmented sense lines and sense line gating. The left half of the drawing is diagrammatic, illustrating the superconductive film layers required to implement gating of two sense line segments. The right half of the drawing is a schematic representation of two more sense line segments and the sense amplifier.

High speed operation of a superconductor memory requires that sense lines be kept quite short so that the nanosecond-per-foot speed limitation of electrical signals along the sense line does not become a limiting factor. All the storage cells in a particular plane might have identical significance, such as the low-order bit of their respective words, and thus, if time allowed, could all share a single sense line and common sense amplifier. To keep the sense lines short, however, the plane is divided into several arbitrary groups of cells. Separate sense line segments are used for each group, Segmenting of the sense lines usually requires a sense amplifier for each segment. Since sense amplifiers presently are expensive in relation to the other circuits involved in memory, this approach can be costly.

A single sense amplifier can be used for all the sense line segments within the plane by paralleling the sense line segments 1...4 through gates 5...8. Gate 7 thus connects segment 3 to sense amplifier 9. Segments 1...4 connect to sense amplifier bus 10 and via gates 5...8 to sense amplifier bus 11. Y drive lines (only 12 and 13 shown) connect to drive return 14. X drive lines are not shown but are conventional.

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