width that is less than the first parallel data width the last syndrome of the sequence of syndromes corresponds to all of the data in the received sequence of sets application_number US 77886007 A description fig2 diagrammatically illustrates the structure and operation of a crc apparatus according to exemplary embodiments of the invention fig2 illustrates an nsd portion capable of handling multiple data widths received at data input 13 in various embodiments the nsd portion includes a full width nsd 14 see also fig1 one or more partial width nsds such as shown at 14 a and 14 b and a selector 24 having an input coupled to the syndrome output 15 of the full width nsd 14 and also having at least one further input coupled to the syndrome output e g 15 a 15 b of one or more partial width nsds the selector 24 has an output coupled to the input of a feedback register 12 see also fig1 the full width nsd 14 is configured to produce m bit syndromes based on data associated with the full parallel width n of the data input 13 any given partial width nsd is configured to produce m bit syndromes based on data associated with a portion of the full parallel width n of the data input 13 in the example of fig2 a partial width nsd 14 a is coupled at 13 a to receive from data input 13 via a selector a a.