Iterative logic array testing in Java Generating ANSI/AIM Code 39 in Java Iterative logic array testing

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7.3 Iterative logic array testing use java bar code 39 drawer toconnect code 39 full ascii with java Oracle's Java d1 q 0 r i 1, j+1 q i 1 CAS(1,1). CAS(1,2). CAS(1,n). = nn+1 b i, j c i, j 1 r i, j CAS(2,1). CAS(2,2). CAS(2,n). c i, j n2n 1 q n 1 CAS(n,1) CAS(n,2) CAS(n,n). q n rn Figure 7.16 An n n non-restoring array divider and its cell r n+1 r 2n 1 internal cell is guaranteed to propagate to the observable outputs through a chain of XOR gates. Therefore, the carry-save array multiplier is C-testable with eight input vectors under the restricted fault model. In practice, the leftmost diagonal of the array in Figure 7.

13 can be omitted.. Non-restoring array divider A non-restoring array divide r can be implemented as an ILA. The basic cell in such an array is a controlled adder/subtracter (CAS) cell. Each cell has an XOR gate and a full adder as shown in Figure 7.

16. The logic of the CAS(i, j) cell is speci ed by the following equations: ri, j = ri 1, j+1 ci, j bi, j ci, j 1 = ci, j ri 1, j+1 + bi, j ci, j + bi, j ri 1, j+1 where bi, j = qi 1 d j . The cell interconnection for an n n array is shown in the same gure.

The dividend and divisor are represented by N = (n 1 , n 2 , . . .

, n 2n 1 ) and D = (d1 , d2 , . . .

, dn ), respectively, whereas the quotient is represented by Q = (q1 , q2 , . . .

, qn ), and the remainder by R = (rn , rn+1 , . . .

, r2n 1 ). n 1 , d1 , q1 and rn are the respective sign bits. The qi 1 input is used to control the add (qi 1 = 0).

Functional testing V1 P1 = cell 1 C1 P 2 = cell 2 = cell 3 V3 C1 C4 = cell 4 V4 V1 Figure 7.17 Labeling of a block of four cells or subtract (qi 1 = 1) opera Code 3 of 9 for Java tions in the i th row. q0 is held at logic 1 permanently during normal operation, since the initial operation performed in the top row is always subtraction. Consider the data ow graph for a 2 2 block of cells shown in Figure 7.

17 and the corresponding labeling. Notice the similarity with the labeling used earlier for the carry-save array multiplier in Figure 7.15.

This labeling exhaustively tests the full adders in cells 1, 2, 3 and 4. Also, the ri 1, j+1 input labels of cells 1 and 2 are the same as the ri, j output labels of cells 4 and 3, respectively. Thus, the labeling can be repetitively applied to the rows of the array.

Similarly, the ci, j input labels of cells 2 and 4 are the same as ci, j 1 output labels of cells 1 and 3, respectively. Therefore, the labeling can be repetitively applied to the columns of the array as well. The external input d j of cells 1 and 3 is labeled V1 and that of cells 2 and 4 is labeled C4 .

We need to control the external inputs P1 and P2 in such a fashion that we obtain the labels shown at the output of each of the XOR gates. This means that the label for P1 , denoted as L P1 , is given by V1 V3 = C2 C4 = 01011010. Similarly, the label for P2 , denoted as L P2 , is given by V1 C1 = V4 C4 = 01111110.

With these labels, all the XOR gates in the cells are also tested exhaustively. The application of the above labeling to a 3 3 non-restoring array divider is shown in Figure 7.18.

In order to repetitively apply the labeling scheme developed in Figure 7.17, we need some extra logic (two extra XOR gates for most rows, and two extra inputs T1 and T2 ) at the left and right boundaries, as shown. For the left boundary, output labels C1 and V3 need to be transformed to L P2 and L P1 , respectively.

Since C1 L P2 = V3 L P1 = V1 , this means that V1 should be applied to test input T1. Summary.
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