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Address and data scrambling: causes and impact on memory tests

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2 Author(s)
van de Goor, A.J. ; Dept. of Inf. Technol. & Syst., Delft Univ. of Technol., Netherlands ; Schanstra, I.

The way address sequences and data patterns appear on the outside of a memory may differ from their internal appearance; this effect is referred to as scrambling, which has a large impact on the effectiveness of the used tests. This paper presents an analysis of address and data scrambling for memory chips, at the layout and at the electrical level. A method is presented to determine the data backgrounds to be used for the different memory tests. It will be shown that the required data backgrounds are fault model, and hence, also test specific. Industrial results will show the influence of the used data backgrounds on the fault coverage of the tests

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Electronic Design, Test and Applications, 2002. Proceedings. The First IEEE International Workshop on

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