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# Crossover Circuit

IP.com Disclosure Number: IPCOM000094716D
Original Publication Date: 1965-May-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 25K

IBM

## Related People

Maley, GA: AUTHOR

## Abstract

This circuit has the effect of physically crossing over two wires between a pair of input terminals and a pair of output terminals but the wires are, in fact, kept in the same plane. In monolithic circuitry, there is the requirement of interconnecting the chips to outside circuitry or one chip to another. This circuit eliminates the necessity of bringing signal leads to edge connectors and back into the logic chip at some other point in order to achieve a signal crossover. The drawing shows the crossover circuit in And Invert logic.

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Crossover Circuit

This circuit has the effect of physically crossing over two wires between a pair of input terminals and a pair of output terminals but the wires are, in fact, kept in the same plane. In monolithic circuitry, there is the requirement of interconnecting the chips to outside circuitry or one chip to another. This circuit eliminates the necessity of bringing signal leads to edge connectors and back into the logic chip at some other point in order to achieve a signal crossover. The drawing shows the crossover circuit in And Invert logic.

And Invert 10 receives both inputs A and 13 and produces a signal A + 13 at its output. This signal is applied to other logic to introduce functions of 13 into the lines associated with the A input and the 13 output and vice versa and then to separate the extraneous terms from the outputs.

And Invert's 11 and 12 are connected to receive the output of And Invert 10 and the signal at an associated input terminal. And Invert' s 11 and 12 produce signals A + 13 and A + 13. Thus, each signal contains the desired output term, A or 13, and an undesired function of the other term, A or 13. And's 13 and 14 are connected to receive these inputs and to receive a second input that is appropriate to form only the desired values A and B at the output terminals.

For the And function of 13 and 14, A + B is an appropriate input to cancel the unwanted term of the inputs A + B and A + B. This input is formed by And Invert 15 that recei...