Data stored in a first memory are processed by a processing device comprising a processor, a second memory, and an interface device interfacing the processing of data from the first memory. In the interface device, in order to facilitate transfer of data from the first memory where data are stored in a first data format to the second memory where data are stored in a second data format, a first group of data is received from the first memory, with said group ordered into a sequence corresponding to the first data format. Then at least one second group of data is obtained by ordering said data in the first group into a new sequence which is a function of the first and second data formats. The second group of data is stored in the second memory.