Get Built In Test for VLSI: Pseudorandom Techniques now with the O’Reilly learning platform. In an LFSR having a characteristic polynomial with many terms, it is sometimes advantageous to use a different form to reduce the delay that is introduced by. It was noted earlier that the sequences generated by the two circuits are the exact reversal of one another. In Figure 6.1(b), the LFSR implements the reciprocal characteristic polynomial. A standard implementation was used for purposes of illustration. The general properties of LFSRs have been discussed previously, but will be briefly reviewed here. A sampling of those examples that have promise for use as stimulus generators for built-in test are described in the following. However there are many special cases of linear and nonlinear feedback shift-register implementations that have been used in special situations. In Chapter 3 the properties of linear feedback shift registers used as sequence generators were examined in detail. 6 Special Purpose Shift-Register Circuits
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