Method and apparatus for verifying CRC codes
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United States of America Patent
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Jul 7, 1998
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N/A
app pub date -
Jan 11, 1996
filing date -
Feb 5, 1993
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Abstract
Apparatus for verifying a CRC code of a message transmitted as a succession of sub-blocks comprises dedicated hardware including a linear feedback shift register for deriving a `partial` CRC code for each individual sub-block. These partial CRC codes are held in a store for subsequent combination under software program control. The combination is performed in a iterative manner, each partial CRC code being added modulo 2 to values selected from look-up tables in accordance with the result of the previous step of the iteration. The division of the CRC verification into two operations and the use of precalculated look-up tables facilitate the efficient, simultaneous reception of many messages having interleaved sub-blocks without incurring serious time penalties.
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