The Big/Little Endian mode switch will affect the word order when read data bus width and write data bus width are set as different values:
- Case 1: write data bus width is 36bits and read data bus width is 18bits
- For the Big Endian mode: if write Data[35:0], you will first read out Data[17:0] and then Data[38:18].
- For the Little Endian mode: if write Data[35:0], you will first read out Data[35:18] and then Data[17:0].
- Case 2: write data bus width is 18bits, and read data bus width is 36bits:
- For the Big Endian mode, first word written into FIFO is shown at Q[17:0] when read out.
- For the Little Endian mode, first word written into FIFO is shown at Q[35:18] when read out.