Browse Prior Art Database

Matrix Switch

IP.com Disclosure Number: IPCOM000095705D
Original Publication Date: 1964-May-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 56K

Publishing Venue

IBM

Related People

Bruce, GD: AUTHOR [+2]

Abstract

The word lines in a store matrix are selected and operated by the appropriate combination of separate matrix switch core secondary windings. These act as read drive, read gate, write drive and write gate. The word line, such as line 1, is selected to read or write by the respective windings of switch cores, such as cores 11 and 21. The current path is determined by selectively operated diodes and presents a low impedance by virtue of a clamp diode, such as diode 35 for reading and 37 for writing. The word drive current partially replaces the current in the gate circuit.

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Matrix Switch

The word lines in a store matrix are selected and operated by the appropriate combination of separate matrix switch core secondary windings. These act as read drive, read gate, write drive and write gate. The word line, such as line 1, is selected to read or write by the respective windings of switch cores, such as cores 11 and 21. The current path is determined by selectively operated diodes and presents a low impedance by virtue of a clamp diode, such as diode 35 for reading and 37 for writing. The word drive current partially replaces the current in the gate circuit.

The stray capacitance 5 between each word line and ground is used to keep the gate bus at ground potential during change-over from read gate to write gate condition, thus permitting fast action. As the write gate pulse ends, the stray capacitance is discharged by a transistor pump, such as that incorporating transistors 49.

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