Rainbow Electronics MAX9860 - Manual (Page 19)

Digital Audio Interface
The MAX9860’s digital audio interface supports a wide
range of operating modes to ensure maximum compati-
bility. See Figures 1 through 4 for timing diagrams. In
master mode, the MAX9860 outputs LRCLK and BCLK,
while in slave mode, they are inputs. When operating in
master mode, BCLK can be configured in a number of
ways to ensure compatiblity with other audio devices.
MAX9860
16-Bit Mono Audio Voice Codec
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Table 5. Digital Audio Interface Registers
REGISTER ADDRESS B7 B6 B5 B4 B3 B2 B1 B0
0x06 MAS WCI DBCI DDLY HIZ TDM 0 0
0x07 0 0 ABCI ADLY ST BSEL
BITS FUNCTION
MAS
Master Mode
0 = The MAX9860 operates in slave mode with LRCLK and BCLK configured as inputs.
1 = The MAX9860 operates in master mode with LRCLK and BCLK configured as outputs.
WCI
LRCLK Invert
0 = Left-channel data is input and output while LRCLK is low.
1 = Right-channel data is input and output while LRCLK is low.
WCI is ignored when TDM = 1.
DBCI
DAC BCLK Invert (must be set to ABCI)
In master and slave mode:
0 = SDIN is latched into the part on the rising edge of BCLK.
1 = SDIN is latched into the part on the falling edge of BCLK.
In master mode:
0 = LRCLK changes state following the rising edge of BCLK.
1 = LRCLK changes state following the falling edge of BCLK.
DDLY
DAC Delay Mode
0 = SDIN data is latched on the first BCLK edge following an LRCLK edge.
1 = SDIN data is assumed to be delayed one BCLK cycle so that it is latched on the 2nd BCLK edge
following an LRCLK edge (I 2 S-compatible mode).
DDLY is ignored when TDM = 1.
HIZ
SDOUT High-Impedance Mode
0 = SDOUT is set either high or low after all data bits have been transferred out of the part.
1 = SDOUT goes to a high-impedance state after all data bits have been transferred out of the part,
allowing SDOUT to be shared by other devices.
Use HIZ only when TDM = 1.
TDM
TDM Mode Select
0 = LRCLK signal polarity indicates left and right audio.
1 = LRCLK is a framing pulse which transitions polarity to indicate the start of a frame of audio data
consisting of multiple channels.
W hen op er ati ng i n TD M m od e the l eft channel i s outp ut i m m ed i atel y fol l ow i ng the fr am e sync p ul se. If r i g ht-
channel d ata i s b ei ng tr ansm i tted , the 2nd channel of d ata i m m ed i atel y fol l ow s the 1st channel d ata.
ABCI
ADC BCLK Invert (must be set to DBCI)
0 = SDOUT is valid on the rising edge of BCLK and transitions immediately after the rising edge.
1 = SDOUT is valid on the falling edge of BCLK and transitions immediately after the falling edge.