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Cause effect diagnosis in Java Creator 3 of 9 in Java Cause effect diagnosis




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10.4 Cause effect diagnosis use servlet barcode code39 development tointegrate 3 of 9 barcode with java MSI Plessey as the two faul Code 39 Extended for Java ts (among all the SAFs and TFs) that may be present within the CUT. Two-line NFBFs as dependent on single SAFs: An approach similar to the one above can also be used for two-line NFBFs of type wired-AND, wired-OR, and driverstrength (Chess et al., 1995; Lavo et al.

, 1997; Millman et al., 1990; Narayanan et al., 1997; Waicukauski and Lindbloom, 1989).

A dictionary entry for a wired-AND NFBF between lines b1 and b2 (say, fault f 1 ) can be constructed using the error responses for fault b1 SA0 (say, fault f 2 ) and fault b2 SA0 (say, fault f 3 ), as described in Table 10.4. Second, since a vector that detects one of these SA0 faults may or may not detect the BF (depending on whether it also implies logic 0 at the other line), the response of a CUT with fault f 1 may be covered by the above dictionary entry.

This is re ected by marking the matching criterion on the dictionary entry for fault f 1 as cover . Example 10.22 The above method can be employed to augment the SAF dictionary shown in Table 10.

5 to obtain the dictionary for SAFs (modeled) and two-line wiredAND NFBFs (dependent) as shown in Table 10.13. The approximate values of failing vectors and error responses for a BF described above can be further re ned using additional information provided by the SAF dictionary (Lavo et al.

, 1998a). As described in Table 10.3, only those vectors which detect fault b1 SA0 and imply logic 0 at line b2 or vice versa detect the wired-AND BF between b1 and b2 .

For some vectors, the SAF dictionary provides the information whether the second condition is satis ed. Example 10.23 In the dictionary shown in Table 10.

13, the dictionary entries for faults x1 SA0 and z 2 SA0 are E x1 SA0 = ((1, 0), (0, 0), (0, 0), (1, 0)), and E z 2 SA0 = ((0, 0), (0, 1), (0, 1), (0, 1)). An examination of the above error responses for vector P4 indicates that P4 detects the fault x1 SA0 as well as z 2 SA0. This clearly indicates that P4 implies logic 1 at x1 as well as at z 2 (in the fault-free version of the circuit).

Hence, P4 cannot detect the wired-AND BF between x1 and z 2 . This fact can be used to obtain the following approximate value of the error response for the wired-AND BF between x1 and z 2 : ((1, 0), (0, 1), (0, 1), (0, 0)). This should be compared with the approximate value of the same error response shown in Table 10.

13, namely ((1, 0), (0, 1), (0, 1), (1, 1)).. Fault diagnosis Table 10.13. A fault dictionary for SAFs and two-line wired-AND BFs for the circuit and vectors in Figure 10.

1, derived from the SAF dictionary in Table 10.5 Fault Comparison criterion Match Match Match Match Match Match Match Match Match Match Match Match Match Match Cover Cover Cover Cover Cover Cover Error for vector Pi at output zl P1 P2 P3 P4 z1 z2 z1 z2 z1 z2 z1 z2. x1 SA0 c1 SA0 z jar barcode 3/9 1 SA1 x1 SA1 x2 SA0 x2 SA1 x3 SA0 c2 SA0 z 2 SA1 x3 SA1 c1 SA1 c2 SA1 z 1 SA0 z 2 SA0 x1 x2 AB x1 x3 AB x2 x3 AB x1 z 2 AB x3 z 1 AB z 1 z 2 AB. 1 1 1 1 1 1. 1 1 1 1 1 1 1 1 1 1. 1 1 1 1 1 1 1 1 1 1. Note that the n jvm Code 3 of 9 ew approximate value of the error response of this BF is closer to the actual value of its error response which the reader can derive by explicit simulation of the fault as ((1, 0), (0, 0), (0, 1), (0, 0)). In general, for a wired-AND bridge between b1 and b2 , the approximate value of the error response given in Table 10.13 is modi ed by removing all the error values for any vector Pi for which an error appears in the dictionary entry of b1 SA0 as well as in the entry for b2 SA0.

Similar modi cations can be derived for each of the other types of BFs. The reader is invited to make all such changes to the dictionary shown in Table 10.13.

Once the dictionary is obtained for the SAFs and BFs, the procedure described before can be used to perform diagnosis assuming that a defect may be characterized either by a single SAF or by a two-line BF of the above type..
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