The second table is determined by dividing the ratio of bits 10 and 11. The bit ratio1 is defined when the bit ratio0 is finished, but I don't care to write code to write 11 on the ratio, just in case anything happens to the printed bit order. The CS4272 Codec features a second mode for external crystals where it is configured to receive the MCLK master clock from the i2S interface and generate a 24576MHz crystal.