Table of Contents
Vicente Cavanna VLSI Architect 19 March, 2001
Purpose
Premise for superiority of CRC
Probability of various patterns
Disturbance can cause large local BER
Probability of Any One Given n-bit Pattern with x errors
Probability Distribution of X, the number of errors in n bits, is Binomial
Probability Distribution of the number of errors, X, in 40 bits
Which patterns are more probable depends on BER
Mechanisms in iSCSI favoring few errors
Mechanisms in iSCSI favoring many errors
Performance for few errors
Performance for few errors
Performance for few errors
Performance for many errors
Properties of CCITT-CRC32 for single bit errors
Properties of CCITT-CRC32 for error bursts
Cost of Poly complexity
Recommendation
If time permits ….
Irreducible or Prime Polynomial
Primitive Polynomial
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