CS42448 datasheet(34/64 Pages) CIRRUS

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DS648F2

CS42448

4.5.7

I/O Channel Allocation

4.6

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 (ADC_LRCK). If the AUX_SDIN signal is not being

used, it should be tied to AGND via a pull-down resistor.

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 “Interface Formats (Address

04h)” on page 44.

4.6.1

I²S

4.6.2

Left-Justified

Digital Input/Output

Interface

Format

Analog Output/Input Channel Allocation

from/to Digital I/O

DAC_SDIN1

I²S, LJ, RJ

OLM

TDM

AOUT 1,2

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

AOUT 1,2,3,4,5,6,7,8

DAC_SDIN2

I²S, LJ, RJ

OLM

TDM

AOUT 3,4

Not Used

DAC_SDIN3

I²S, LJ, RJ

OLM

TDM

AOUT 5,6

Not Used

DAC_SDIN4

I²S, LJ, RJ

OLM

TDM

AOUT 7,8

Not Used

ADC_SDOUT1

I²S, LJ, RJ

OLM

TDM

AIN 1,2

AIN 1,2,3,4,5,6

AIN 1,2,3,4,5,6; (2 additional channels from AUX_SDIN)

ADC_SDOUT2

I²S, LJ, RJ

OLM

TDM

AIN 3,4

Not Used

ADC_SDOUT3

I²S, LJ, RJ

OLM

TDM

AIN 5,6

Not Used

Table 9. Serial Audio Interface Channel Allocations

AUX_LRCK

AUX_SCLK

MS B

LS B

MS B

LS B

AUX1

L eft C h an nel

R ig ht C h an nel

AUX_SDIN

AUX2

MSB

Figure 21. AUX I²S Format

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