Browse Prior Art Database

Array Structured Decoder With Complementary Programmable Crosspoint Switching

IP.com Disclosure Number: IPCOM000081837D
Original Publication Date: 1974-Aug-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Wu, WW: AUTHOR

Abstract

Externally programmable array-structured logic characteristically employs a single switching cell per each array crosspoint in which the cell comprises a bistable-circuit element and a gating-circuit element. However, when the array is dedicated to decoding, economies may be effected by utilizing single bistable circuits to control the complementary conditioning of pairs of crosspoint gating elements associated with pairs of complementary (phase-split) input functions.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 2

Array Structured Decoder With Complementary Programmable Crosspoint Switching

Externally programmable array-structured logic characteristically employs a single switching cell per each array crosspoint in which the cell comprises a bistable-circuit element and a gating-circuit element. However, when the array is dedicated to decoding, economies may be effected by utilizing single bistable circuits to control the complementary conditioning of pairs of crosspoint gating elements associated with pairs of complementary (phase-split) input functions.

As shown in the figure, bistable memory-cell element MC-XY provides complementary conditioning (Q,Q) to paired crosspoint switch elements XPS(1) and XPS(2), which span the intersections of output line Y and paired input lines associated with complementary signal functions X and X. Write conditioning of MC-XY is provided by coincident selective excitation of the X word write line and one of the two Y bit write lines.

1

Page 2 of 2

2

[This page contains 3 pictures or other non-text objects]