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Browse Prior Art Database

Immediate-Resetting Decoder

IP.com Disclosure Number: IPCOM000041697D
Original Publication Date: 1984-Mar-01
Included in the Prior Art Database: 2005-Feb-02

Publishing Venue

IBM

Related People

Authors:
Chang, WH Geppert, LM [+details]

Abstract

Firing a decoder reset pulse generator with the same signal that is used to initiate decoding, delaying the reset pulse sufficiently to ensure that the decoder has completed the decode operation, and using the delayed pulse to reset the decoder eliminates the multiple switching event problem. Fig. 1 shows a decoder from a Josephson junction memory. In a multiple switching event, a decoder gate fires two or more times, delivering a series of pulses to its load (the control line of the succeeding decoder stage or an array driver). Multiple switching is a serious problem for two reasons: First, it causes latchup of the sense line. During correct operation, the sense line driver has reset before a sense gate is fired.