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Logical Connectives

IP.com Disclosure Number: IPCOM000096467D
Original Publication Date: 1963-Jun-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Schmokler, MS: AUTHOR

Abstract

Logical connective operations are efficiently performed by two registers and a minimum of control circuitry.

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Logical Connectives

Logical connective operations are efficiently performed by two registers and a minimum of control circuitry.

Gates interposed in 36-bit transfer cables control the exchange of 36-bit words between, and within, the storage register SR and sense indicators S1. For example, a signal 2 transfers a S1 word to SR. A signal 4 inverts the SR word. A signal 5 places in SI the And function of the SR and SI words. The circuit which performs the And function is composed of thirty-six separate And's. Each is associated with the feedback path of one storage position of the SI register. Delay-line latches efficiently perform both the storage and the logical connective operations.

Examples of some of the sixteen possible logical connective operations that can be performed are outlined in the following table. Words in SR are designated A, while words in SI are designated B. In each case, the indicated signals are supplied in order from left to right, simultaneous signals being specified by numbers in parenthesis. TABLE Connective Function Title Signals A Load SI 3 A+B OR to SI (1, 2), 3 AB Reset SI 4, 5 AVB Excl. OR to SI (1, 2, S), (2, 3), 4, S or (1, 2, S), (4, 2), 4, 3.

As an illustration, assume that the 36-bit word 00... 011011 in SR is to be OR'd with the 36-bit word 00... 100100 in SI, the result appearing in SI. First, (signals 1, 2) both words are simultaneously entered into SR as 00... 111111. Second, (signal 3) this word, which is the desired result...