Unformatted text preview: “don’t care” value in the first vector for signal a is a logic 1, the transition on b would still be propagated to d , as the transition on d depends on the later of the two transitions. In short, a delay on a will not prevent the target path from being detected. Given the above discussion, the value criteria for each off-input of P for a robustly testable path are as follows: ± When the corresponding on-input of P has a controlling to noncontrolling transition, the value in the first vector for the off-input can be “don’t care,” with the value for the off-input as a noncontrolling value in the second vector....
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- Spring '08
- Logic, robustly testable path