In this work we illustrates the strong interaction between the data organisation in background memory and the data format required for sub-word level acceleration. The impact of such interaction is demonstrated on the implementation of a Digital Audio Broadcast Channel Decoder on a TriMedia processor, where data format transformations applied on the background memory data enable a substantially better exploitation of the available Single Instruction Multiple Data instructions. As a result, a factor two reduction for both execution time and data memory energy is achieved.