ENC3250 Solutions pg 36

ENC3250 Solutions pg 36 - 8.4 At the conclusion of the data...

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Unformatted text preview: 8.4 At the conclusion of the data transfer, just before the CRC pattern arrives, the shift register should contain the identical CRC result. Now, the bits of the incoming CRC are applied at point C 4 (Figure 8.3). Each 1 bit will merge with a 1 bit (exclusive-or) to produce a 0; each 0 bit will merge with a 0 bit to produce a zero. 8.5 8.6 a. b. Data = 1 0 0 1 1 0 1 1 1 0 0 M(X) = 1 + X3 + X4 + X6 + X7 + X8 X4 M(X) = X 12 + X11 + X10 + X8 + X7 + X4 X 4 M (X ) X2 = X12 + X11 + X10 + X 8 + X 7 + P (X ) P( X) R(X) = X2 T(X) = X 4 M(X) + R(X) = X12 + X11 + X10 + X8 + X7 + X4 + X2 Code = 0 0 1 0 1 0 0 1 1 0 1 1 1 0 0 c. Code = 0 0 1 0 1 0 0 0 1 0 1 1 1 0 0 T (X ) yields a nonzero remainder P (X ) -36- ...
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