公开(公告)号：US20080091999A1

公开(公告)日：2008-04-17

申请号：US11956480

申请日：2007-12-14

申请人： Todd BURDINE ,  Donato FORLENZA ,  Orazio FORLENZA ,  William HURLEY ,  Phong TRAN

发明人： Todd BURDINE ,  Donato FORLENZA ,  Orazio FORLENZA ,  William HURLEY ,  Phong TRAN

IPC分类号： G01R31/28 ,  G06F11/25

CPC分类号： G06F11/2215

摘要： A method, apparatus and computer program product are provided implementing a scan chain diagnostics technique. The diagnostics technique includes employing fuses coupled to latches of the scan chain to load a known logic value into the latches at known locations of the scan chain, and then unloading values from the scan chain, and if the scan chain is defective (for example, based on the unloaded logic values), then localizing a defect in the scan chain from the unloaded logic values by comparison thereof with the known locations of the latches of the scan chain loaded with the known logic value via the fuses. The scan chain may be predesigned with fuses spaced periodically across the chain every n latches to facilitate subsequent localization of a detected defect in the scan chain.

摘要翻译： 提供了实现扫描链诊断技术的方法，装置和计算机程序产品。 诊断技术包括使用耦合到扫描链的锁存器的熔丝将已知逻辑值加载到扫描链的已知位置处的锁存器中，然后从扫描链中卸载值，并且如果扫描链有缺陷（例如， 基于卸载的逻辑值），然后通过与已加载逻辑值的扫描链中的缺陷通过经由保险丝加载了已知逻辑值的扫描链的锁存器的已知位置进行比较来定位扫描链中的缺陷。 可以使用每n个锁存器在链上周期性间隔的保险丝对扫描链进行预先设计，以便于扫描链中检测到的缺陷的随后定位。