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Core Memory Plane Wiring Patterns

IP.com Disclosure Number: IPCOM000090162D
Original Publication Date: 1969-Feb-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Bosch, LJ: AUTHOR [+3]

Abstract

Memory core plane wiring configurations are shown in drawings A...E. Each core 2 is threaded by three wires, an X and a Y drive wire and a sense wire. A pair of sense wires is connected to the inputs of a differential sense amplifier SA. The single Y wire and the two X wires in each drawing illustrate the wiring pattern for an array of many X and Y wires.

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Core Memory Plane Wiring Patterns

Memory core plane wiring configurations are shown in drawings A...E. Each core 2 is threaded by three wires, an X and a Y drive wire and a sense wire. A pair of sense wires is connected to the inputs of a differential sense amplifier SA. The single Y wire and the two X wires in each drawing illustrate the wiring pattern for an array of many X and Y wires.

The selection currents on the X and Y wires produce undesirable noise on the sense wires. The coupling of the two sense wires to the drive wires is arranged so that the noise appears at both inputs of the SA and is thus cancelled. Each Y wire is equally coupled to each sense wire and the noise associated with the Y selection currents is substantially cancelled. X drive wires are customarily transposed so that each X wire is coupled along half its length to one sense wire and along the other half of its length to the other sense wire. In these wiring patterns, the transpositions between the X wires and sense wires are made only along the edge of the array. The wires all extend straight through a row of cores without transpositions within the array. The connections between row wires at the edge of the array are formed by connectors supported by a core frame.

In drawing A, drive wire X1 has a portion 3 coupled to a sense wire 4 and a portion 5 coupled to a sense wire 6. As the X selection current propagates along portion 3, a corresponding noise voltage propagates toward the SA on...