CS42432 datasheet(32/59 Pages) CIRRUS

32 / 59 page

DS673F1

CS42432

FS is sampled as valid on the rising SCLK edge preceding the most significant bit of the first data sample

and must be held valid for at least 1 SCLK period.

Note:

The ADC does not meet the timing requirements for proper operation in Quad-Speed Mode.

5.5.2

I/O Channel Allocation

5.6

AUX Port Digital Interface Formats

These serial data lines are used when supporting the TDM Mode of operation with an external ADC or

S/PDIF receiver attached. The AUX serial port operates only as a clock master. The AUX_SCLK will operate

at 64xFs, where Fs is equal to the ADC sample rate (FS on the TDM interface). If the AUX_SDIN signal is

not being used, it should be tied to AGND via a pull-down resistor.

5.6.1

Hardware Mode

The AUX port will only operate in the Left-Justified digital interface format and supports bit depths ranging

from 16 to 24 bits (see Figure 17 on page 34 for timing relationship between AUX_LRCK and

AUX_SCLK).

5.6.2

Software Mode

The AUX port will operate in either the Left-Justified or I²S digital interface format with bit depths ranging

from 16 to 24 bits. Settings for the AUX port are made through the register “Miscellaneous Control (Ad-

dress 04h)” on page 41.

5.6.3

I²S

Digital Input/Output

Interface

Format

Analog Output/Input Channel Allocation

from/to Digital I/O

DAC_SDIN

TDM

AOUT 1,2,3,4,5,6

ADC_SDOUT

TDM

AIN 1,2,3,4 (2 additional channels from AUX_SDIN)

Table 4. Serial Audio Interface Channel Allocations

SCLK

256 clks

Bit or Word Wide

AOUT6

LSB

MSB

LSB

MSB

LSB

MSB

LSB

MSB

LSB

MSB

LSB

MSB

DAC_SDIN

AOUT1

AOUT4

AOUT2

AOUT5

AOUT3

32 clks

LSB

MSB

LSB

MSB

32 clks

MSB

LSB

MSB

LSB

MSB

LSB

MSB

LSB

MSB

LSB

MSB

LSB

MSB

ADC_SDOUT

AIN1

AIN4

AIN2

AIN3

32 clks

AUX2

LSB

MSB

LSB

MSB

AUX1

32 clks

MSB

Figure 13. TDM Serial Audio Format

AUX_LRCK

AUX_SCLK

MS B

LS B

MS B

LS B

AUX1

L e ft C h an ne l

R ig h t C h an ne l

AUX_SDIN

AUX2

MSB

Figure 14. AUX I²S Format

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