CS42432 datasheet(33/62 Pages) CIRRUS

33 / 62 page

DS673PP2

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 op-

erate 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.

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 15 on page 33 for timing relationship between AUX_LRCK and AUX_SCLK).

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 42.

5.6.1 I²S

5.6.2 Left Justified

AUX_LRCK

AUX_SCLK

MS B

LS B

MS B

LS B

AUX1

Left C h an ne l

R ig h t C h an n e l

AUX_SDIN

AUX2

MSB

Figure 14. AUX I²S Format

AUX_LRCK

AUX_SCLK

MS B

LS B

MS B

LS B

AUX1

L e ft C hanne l

R ig h t C han ne l

AUX_SDIN

AUX2

MSB

Figure 15. AUX Left Justified Format

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