WM8994ECSSLASHR datasheet(196/363 Pages) CIRRUS

196 / 363 page

WM8994

196

Rev 4.6

Note that the audio interface cannot support every possible combination of input and output sample

rate simultaneously, but only where the ratio of the sample rates matches the available AIF2ADC_DIV

or AIF2DAC_DIV divider settings.

Note that the WM8994 performs sample rate conversion, where necessary, to provide digital mixing

and interconnectivity between the Audio Interfaces and the DSP Core functions. One stereo Sample

Rate Converter (SRC) is provided for audio input; a second stereo SRC is provided for audio output.

Each SRC is automatically configured on AIF1 or AIF2, depending on the selected Clocking and

Sample Rate settings. The WM8994 cannot support configurations that would require SRC on the

input or output paths of both interfaces si

multaneously. See “Sample Rate Conversion” for further

details.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R517

(0205h)

AIF 2

Clocking

(2)

5:3

AIF2DAC_DIV

000

Selects the AIF2 input path sample rate relative

to the AIF2 output path sample rate.

This field should only be changed from default in

modes where the AIF2 input path sample rate is

slower than the AIF2 output path sample rate.

000 = Divide by 1

001 = Divide by 1.5

010 = Divide by 2

011 = Divide by 3

100 = Divide by 4

101 = Divide by 5.5

110 = Divide by 6

111 = Reserved

2:0

AIF2ADC_DIV

000

Selects the AIF2 output path sample rate

relative to the AIF2 input path sample rate.

This field should only be changed from default in

modes where the AIF2 output path sample rate

is slower than the AIF2 input path sample rate.

000 = Divide by 1

001 = Divide by 1.5

010 = Divide by 2

011 = Divide by 3

100 = Divide by 4

101 = Divide by 5.5

110 = Divide by 6

111 = Reserved

R529

(0211h)

AIF2

Rate

7:4

AIF2_SR

1000

Selects the AIF2 Sample Rate (fs)

0000 = 8kHz

0001 = 11.025kHz

0010 = 12kHz

0011 = 16kHz

0100 = 22.05kHz

0101 = 24kHz

0110 = 32kHz

0111 = 44.1kHz

1000 = 48kHz

1001 = 88.2kHz

1010 = 96kHz

All other codes = Reserved

Note that 88.2kHz and 96kHz modes are

supported for AIF2 input (DAC playback) only.

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