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Multiplexing Apparatus

IP.com Disclosure Number: IPCOM000094374D
Original Publication Date: 1966-Oct-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Drimax, EG: AUTHOR [+3]

Abstract

This apparatus scans a plurality of communication lines 10. The apparatus transfers information to and from units attached to lines 10 to storage 12 which can be part of a processor. Delay line 11 containing bit storage sufficient for the number lines 10 to be scanned is cyclically driven to scan these lines and employs circuit 14 which generates a signal indicative of the line being sensed. This signal, by circuit 16, selects on a cyclic basis an address in storage 12 at which is contained a word of data bits and control bits uniquely associated with each individual line 10. For example, the first several bits in each word, designated generally as 12a, represent control plus a single data bit which is contained in the word for transfer to lines 10 on output operations.

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Multiplexing Apparatus

This apparatus scans a plurality of communication lines 10. The apparatus transfers information to and from units attached to lines 10 to storage 12 which can be part of a processor. Delay line 11 containing bit storage sufficient for the number lines 10 to be scanned is cyclically driven to scan these lines and employs circuit 14 which generates a signal indicative of the line being sensed. This signal, by circuit 16, selects on a cyclic basis an address in storage 12 at which is contained a word of data bits and control bits uniquely associated with each individual line 10. For example, the first several bits in each word, designated generally as 12a, represent control plus a single data bit which is contained in the word for transfer to lines 10 on output operations. Location 12b can contain control for various functions. Location 12c can contain a data byte being accumulated by bits on an input operation or transferred out on an output operation. Locations 12d, etc., contain other information used by a read-only storage control 17 to control the associated lines.

Data between storage 12 and delay 11 is transferred through register 20. In those instances where neither a data transfer nor a control function is required, the control word is restored to storage 12 and no further action initiated. However, when a transfer or control function is detected in register 20 by control 18, the control word is restored to storage and a portion of th...