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# Technique for Determining an Input During a Testing Procedure for a Component Embedded in a Circuit

IP.com Disclosure Number: IPCOM000037662D
Original Publication Date: 1989-May-01
Included in the Prior Art Database: 2005-Jan-29
Document File: 1 page(s) / 11K

IBM

## Related People

Godoy, HC: AUTHOR

## Abstract

In order to test a component that is embedded in a larger circuit, it becomes important to be able to put in any combination of input values and to look at the result at a corresponding output terminal. To obtain correspondence to such an input, a unique function is needed to locate a point where such an input, regardless of the value of the input, the output of the component will go up and down. This, in effect, is analogous to sensitizing a path from an unknown point to the input of the present component.

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Technique for Determining an Input During a Testing Procedure for a Component Embedded in a Circuit

In order to test a component that is embedded in a larger circuit, it becomes important to be able to put in any combination of input values and to look at the result at a corresponding output terminal. To obtain correspondence to such an input, a unique function is needed to locate a point where such an input, regardless of the value of the input, the output of the component will go up and down. This, in effect, is analogous to sensitizing a path from an unknown point to the input of the present component.

The technique involves the following steps:

1.) Determine whether there is redundancy involved.

2.) Sort the request list first to locate correspondence requests.

3.) The input selected on the first backtrace is set to a 1/0 value.

4.) The remaining inputs are stimulated to the required value until the 1/0 or 0/1 value is achieved at the required correspondence output point. 5.) The conflict checker detects when values used to achieve this input to the component also affects another input adversely. 6.) To ensure that the path is sensitized properly, the original input that was selected is stimulated to the opposite value to determine whether the output switches accordingly.

This identifies the input that controls only the required correspondence output point.

Disclosed anonymously.

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