A method of buffering data in a circuit processing data in both a natural address order and a modified address order is described. The method comprises the steps of storing a first block of data according to a first addressing order of a natural address order or a modified address order; reading the first block of data stored in a buffer according to the other addressing order of the natural address order and the modified address order; and simultaneously writing a second block of data to the buffer in the other addressing order while reading the first block of data stored in a buffer according to the other addressing order.