11. A method according to claim 10 , wherein the first word width is an integer multiple of the second word width; wherein the manipulating includes dividing a first data word with the first word width from the first data interface into a plurality of second data words that each have the second word width; wherein the transferring includes supplying the second data words successively to the second data interface; wherein the circuit includes a storage portion having a plurality of independently controlled storage elements; wherein the dividing includes grouping the second data words in a manner so that each group includes a respective positive integer number of the second data words, and storing each group of the second data words in a respective one of the storage elements; wherein the supplying includes supplying the second data words in succession from the storage portion to the second data interface; wherein each group includes the same number of the second data words; including maintaining a first value that is representative of the number of the second data words in each group, and maintaining a second value that is representative of the number of groups; and wherein the supplying includes, as a function of the first and second values, successively enabling in a mutually exclusive manner each of the storage elements having a group of the second data words therein, each of these storage elements, when enabled, transferring the second data words therein to the second interface.
11. A method according to claim 10 , wherein the first word width is an integer multiple of the second word width; wherein the manipulating includes dividing a first data word with the first word width from the first data interface into a plurality of second data words that each have the second word width; wherein the transferring includes supplying the second data words successively to the second data interface; wherein the circuit includes a storage portion having a plurality of independently controlled storage elements; wherein the dividing includes grouping the second data words in a manner so that each group includes a respective positive integer number of the second data words, and storing each group of the second data words in a respective one of the storage elements; wherein the supplying includes supplying the second data words in succession from the storage portion to the second data interface; wherein each group includes the same number of the second data words; including maintaining a first value that is representative of the number of the second data words in each group, and maintaining a second value that is representative of the number of groups; and wherein the supplying includes, as a function of the first and second values, successively enabling in a mutually exclusive manner each of the storage elements having a group of the second data words therein, each of these storage elements, when enabled, transferring the second data words therein to the second interface. 12. A method according to claim 11 , responding to a third value that is representative of a selected number of data words with the first word width that will be arriving at the first data interface, the selected number of data words including the first data word followed by a positive integer number of further data words; and wherein the manipulating and the transferring are carried out for each of the selected number of data words.