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Strobe Generator For Magnetic Memory

IP.com Disclosure Number: IPCOM000098401D
Original Publication Date: 1960-Sep-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Councill, ED: AUTHOR [+5]

Abstract

Conventional magnetic core memory systems provide for gating or strobing the sense amplifiers to prevent spurious noise from passing into the memory data register. In high speed systems difficulty is experienced in timing the strobe signal to match it with information signals appearing on the sense lines during readout. This difficulty is solved by generating the strobe signal from the matrix switches employed to address the memory. The strobe signal, being generated as a function of the device which reads the memory cores, is always properly timed for each individual operation.

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Strobe Generator For Magnetic Memory

Conventional magnetic core memory systems provide for gating or strobing the sense amplifiers to prevent spurious noise from passing into the memory data register. In high speed systems difficulty is experienced in timing the strobe signal to match it with information signals appearing on the sense lines during readout. This difficulty is solved by generating the strobe signal from the matrix switches employed to address the memory. The strobe signal, being generated as a function of the device which reads the memory cores, is always properly timed for each individual operation.

A pair of matrix switches 10 and 11 is employed to address the memory 12. A staggered read system is employed during readout, the switch 11 being activated slightly ahead of the switch 10 to reduce the amount of half select noise accompanying the information signal. The strobe signal generator comprises a winding 13 coupled to each core of the matrix switch 10. When any core of switch 10 is activated, a voltage pulse is induced in winding 13. Because switch 10 is activated later than switch 11, the strobe pulse is developed at the same time the selected core is read out.

Shaping and delay circuitry 14 is provided to shape the strobe pulse and to delay it for the time required for an information pulse to reach the sense amplifier
15. A gate 16 is also provided to block passage of the strobe signal under control of instructions from the computer.

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