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WM9711 Datasheet(PDF) 36 Page - Wolfson Microelectronics plc |
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WM9711 Datasheet(HTML) 36 Page - Wolfson Microelectronics plc |
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36 / 66 page  WM9711L Production Data w PD Rev 4.1 April 2004 36 VARIABLE RATE AUDIO / SAMPLE RATE CONVERSION By using an AC’97 Rev2.2 compliant audio interface, the WM9711L can record and playback at all commonly used audio sample rates, and offer full split-rate support (i.e. the DAC, ADC and AUXDAC sample rates are completely independent of each other – any combination is possible). The default sample rate is 48kHz. If the VRA bit (register 20h) is set and the appropriate block is enabled, then other sample rates can be selected by writing to registers 2Ch, 32h and 2Eh. The AC- Link continues to run at 48k frames per second irrespective of the sample rate selected. However, if the sample rate is less than 48kHz, then some frames do not carry an audio sample. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION 2Ah Extended Audio Stat/Ctrl 0 VRA 0 (OFF) Variable Rate Audio 0: OFF (DAC and ADC run at 48kHz) 1: ON (sample rates determined by registers 2Ch, 2Eh and 32h) 2Ch Audio DAC Sample Rate 15:0 DACSR BB80h (48kHz) Audio DAC sample rate 1F40h: 8kHz 2B11h: 11.025kHz 2EE0h: 12kHz 3E80h: 16kHz 5622h: 22.05kHz 5DC0h: 24kHz 7D00h: 32kHz AC44h: 44.1kHz BB80h: 48kHz Any other value defaults to the nearest supported sample rate 32h Audio ADC Sample Rate 15:0 ADCSR BB80h (48kHz) Audio ADC sample rate similar to DACSR 2Eh AUXDAC Sample Rate 15:0 AUXDA CSR BB80h (48kHz) AUXDAC sample rate similar to DACSR Table 24 Audio Sample Rate Control |
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