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cn Vendor ID reads back WML4. .. All 6 audio channels are flagged as supported (if I2S enable bit is set). .. Headphone channel flagged as not supported (bit ID4 in register OOh). .. 4 channels of DAC and 2 0f ADC conversion available, with all recommended Audio and modem sample rates supported via the audio sample rate registers 2Ch (front channels; slots 3 and 4), 2Eh (rear channels; slots 7 and 8) and 32h (ADCs) (Note if ID is selected as 11, register 30h is used for sample rate of LFE channel; slot 9). .. GPIO capability supporting Bits 11 t0 13 is flagged as supported. .. Master/slave IDO/1 are supported, with automatic re-mapping of the rear or LFE/centre DAC slot data onto the rear DACs when ID 10 0r 11 are selected (normally surround slots are mapped onto the rear DACs). .. LFE and Center channel data, plus a duplicate of the rear channel data, is sent from the GPIO pins in I2S format, at 48ks/s rate (no variable rates supported by the I2S outputs). .. Headphone/line level outputs are used to output the rear DAC and mixer channel, with volume controlled from register 38h. .. Wolfson 3D stereo enhancement supported. .. Master volume control register maps to the location dependant on selected ID: (ID 00 0r 01 uses master volume at register 02h, ID 10 uses 38h (surround volume) and ID11 uses 36h (LFE, Center volume) In this case, bits 7 and 15 act as left and right mute.). .. DAC mute (reg18h) automatically de-muted, when ID is lx, i.e. used as surround DAC or LFE/center, when surround or LFE/center master volume is de-muted. .. In order to achieve the above functionality, the following changes to the Revision 2.1 compliant defaults are made. .. Revision 2.1 legacy compliance switch is opened (can be closed using REV2SW bit in register 5Ah). .. Rear channel mixer PGA default is now not-muted, OdB gain (same as front channel mixer). .. LNLVL pin volume control is now controlled from 02h unless ID=IO when volume control is from 38h. .. Rear DAC level set by register 70h, default is OdB not-muted. .. Front mixer and rear mixer gains set in registers 72h and 74h.
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