Fast cyclic redundancy check (CRC) generation

An apparatus comprising:

• a first plurality of polynomial division circuits to perform a first plurality of different bit lengths polynomial divisions in parallel, including outputting a first plurality of remainder values, for an iteration of a first iterative CRC generation for a first variable length data block;
• a first selector coupled to the first plurality of polynomial division circuits to select one of said first remainder values outputted for the iteration of said first iterative CRC generation;
• a first register coupled to the first selector and the first polynomial division circuits to store the selected remainder value of the iteration, and to output the stored remainder value to the first polynomial division circuits for use by the first polynomial division circuits to form a first plurality of different bit lengths dividends for the first polynomial division circuits for a next iteration of the first iterative CRC generation for the first variable length data block;
• a second plurality of polynomial division circuits to perform a second plurality of different bit lengths polynomial divisions in parallel, including outputting a second plurality of remainder values, for an iteration of a second iterative CRC generation for a second variable length data block immediately following said first variable length data block;
• a second selector coupled to the second plurality of polynomial division circuits to select one of said second remainder values outputted for the iteration of said second iterative CRC generation;
• a second register coupled to the second selector and the second polynomial division circuits to store the selected remainder value of the iteration, and to output the stored remainder value to the second polynomial division circuits for use by the second polynomial division circuits to form a second plurality of different bit lengths dividends for the second polynomial division circuits for a next iteration of the second iterative CRC generation for the second variable length data block.

An apparatus comprising:

• first alignment unit to align a first variable length data block received in first m groups of n-bit groups with the starting bit of the first variable length data block being located in one of the n-bits of the first n-bit group of the first m groups and the ending bit of the first variable length data block being located in one of n-bits of the last n-bit group of the first m groups, where m and n are integers greater than or equal to 1;
• a first CRC generation unit coupled to the first alignment unit to iteratively generate a first CRC value for the first variable length data block, the first CRC generation unit including a first plurality of polynomial division circuits to perform a first plurality of polynomial divisions for a plurality of different length dividends in parallel for each iteration of the first iterative generation of the first CRC value of the first variable length data block;
• second alignment unit to align a second variable length data block immediately following the first variable length data block, received in second m groups of n-bit groups with the starting bit of the second variable length data block being located in one of the n-bits of the first n-bit group of the second m groups and the ending bit of the second variable length data block being located in one of n-bits of the last n-bit group of the second m groups;
• and
• a second CRC generation unit coupled to the second alignment unit to iteratively generate a second CRC value for the second variable length data block, the second CRC generation unit including a second plurality of polynomial division circuits to perform a second plurality of polynomial divisions for a plurality of different length dividends in parallel for each iteration of the second iterative generation of the first CRC value of the second variable length data block.

A method comprising:

• aligning a first variable length data block received in first m groups of n-bit groups with the starting bit of the first variable length data block being located in one of the n-bits of the first n-bit group of the first m groups and the ending bit of the first variable length data block being located in one of n-bits of the last n-bit group of the first m groups, where m and n are integers greater than or equal to 1;
• iteratively generating a first CRC value for the first variable length data block, including for each iteration, performance of a first plurality of polynomial divisions for a plurality of different length dividends in parallel;
• aligning a second variable length data block immediately following the first variable length data block, received in second m groups of n-bit groups with the starting bit of the second variable length data block being located in one of the n-bits of the first n-bit group of the second m groups and the ending bit of the second variable length data block being located in one of n-bits of the last n-bit group of the second m groups;
• and
• iteratively generating a second CRC value for the second variable length data block, including for each iteration, performance of a second plurality of polynomial divisions for a plurality of different length dividends in parallel for each iteration of the second iterative generation of the first CRC value of the second variable length data block.