Audio Codec相關設定

選擇MCLK當codec SYS_CLK.

1.  播放Sample Rate: 32KHz的設定,
   MCLK: 12.288MHz
   BCLK: 2.048MHz
   Stereo ADC/DAC Filter Clock Select = 384Fs= 384*32KHz = 12.288MHz = MCLK
   Voice I2S Master Mode Clock Relative of BCLK and LRCK = 64Fs = 64*32KHz = 2.048MHz = BCLK 
2. 播放Sample Rate: 44.1KHz的設定,
   MCLK: 11.289MHz (From CPU)
   BCLK: 2.82224MHz (64FS)
   Stereo ADC/DAC Filter Clock Select = 256Fs= 256*44.1KHz = 11.289MHz = MCLK
   Voice I2S Master Mode Clock Relative of BCLK and LRCK = 64Fs = 64*44.1KHz = 2.8224MHz = BCLK
3. 播放Sample Rate: 48KHz的設定,
   MCLK: 12.288MHz (From CPU)
   BCLK: 3.072MHz (64FS)
   Stereo ADC/DAC Filter Clock Select = 256Fs= 256*48KHz = 12.288MHz = MCLK
   Voice I2S Master Mode Clock Relative of BCLK and LRCK = 64Fs = 64*48KHz = 3.072MHz = BCLK