An embodiment of the invention provides a processing circuit of a telecommunications device. The processing circuit includes a pre-buffer, a de-shuffler, and a processing module. The pre-buffer is configured to receive and buffer a plurality of sets of data of a transport block in a shuffled order. The sets of data correspond to a plurality of code blocks, respectively. The de-shuffler is coupled to the pre-buffer and is configured to retrieve the sets of data from the pre-buffer in a de-shuffled order. The de-shuffled order is different from the shuffled order. The processing module is coupled to the de-shuffler and is configured to receive the sets of data from the de-shuffler in the de-shuffled order to recover the code blocks.