Browse Prior Art Database

Bidirectional Switching Arrays

IP.com Disclosure Number: IPCOM000083933D
Original Publication Date: 1975-Aug-01
Included in the Prior Art Database: 2005-Mar-01
Document File: 3 page(s) / 91K

Publishing Venue

IBM

Related People

Wu, WW: AUTHOR

Abstract

Array structured encoders and decoders described in IBM Technical Disclosure Bulletins Vol. 17, No. 3, August 1974, page 813 and Vol. 18, No. 3, August 1975, pages 817 to 819, provide for duplex (bidirectional) signalling with privacy in each direction.

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Bidirectional Switching Arrays

Array structured encoders and decoders described in IBM Technical Disclosure Bulletins Vol. 17, No. 3, August 1974, page 813 and Vol. 18, No. 3, August 1975, pages 817 to 819, provide for duplex (bidirectional) signalling with privacy in each direction.

Fig. 1 shows the schematic organization of such an array. Each row and column has associated receive (R), send (S), input drive (I Dr) and output buffer (0B) circuits. Column to row signal transfer results from enablement of column 1 Dr circuits and row S circuits. Row to column signal flow requires enablement of row I Dr and column S circuits. This article describes details of exemplary circuits for array cross-point cells R, S, I Dr and OB.

Fig. 2 indicates the configuration of a typical cell (one cross-point position) of the array. Fig. 3 indicates typical I Dr and OB circuits. Fig. 4 indicates typical S and R circuits.

In Fig. 2, the word line and associated column select lines (B Phi, B1) provide coincidence selection conditioning of the cell flip-flop (Q, Q), which establishes a relationship of either decoupling or NOR coupling between respective row I Dr and column OB elements, and also between respective column I Dr and row OB elements.

The bidirectional control (Fig. 1) conditions either the row I Dr and column S circuits or the row S and column I Dr circuits, establishing the signal transfer direction relative to all cross-point cells. As a result, parallel signals appearin...