WM8281ECSSLASHR datasheet(105/392 Pages) CIRRUS

105 / 392 page

WM8281

Rev 4.0

105

The EQ, LHPF and DRC functions can be enabled in any signal path within the digital core. The

sample rate for these functions is configured using the FX_RATE register. Note that the EQ, DRC and

LHPF functions must all be configured for the same sample rate.

The DSPn functions can be enabled in any signal path within the digital core. The applicable sample

rates are configured using the DSP1_RATE, DSP2_RATE, DSP3_RATE and DSP4_RATE registers.

The tone generators and noise generator can be selected as input to any of the digital mixers or

signal processing functions. The sample rates for these sources are configured using the

TONE_RATE and NOISE_GEN_RATE registers respectively.

The haptic signal generator can be used to control an external vibe actuator, which can be driven

directly by the Class D speaker output. The sample rate for the haptic signal generator is configured

using the HAP_RATE register.

The PWM signal generators can be modulated by an audio source, derived from the associated signal

mixers. The sample rate (cycle time) for the PWM signal generators is configured using the

PWM_RATE register.

The sample rate control registers are described in Table 23. Refer to the register descriptions for

details of the valid selections in each case. Note that the input (ADC) and output (DAC) signal paths

must always be associated with the SYSCLK clocking domain; different sample rates may be selected

concurrently, but both these rates must be synchronised to SYSCLK.

The control registers associated with the ASRC and ISRCs are described in Table 24 and Table 25

respectively within the following sections.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R32

(0020h)

Tone

Generator

14:11

TONE_RATE

[3:0]

0000

Tone Generator Sample Rate

0000 = SAMPLE_RATE_1

0001 = SAMPLE_RATE_2

0010 = SAMPLE_RATE_3

1000 = ASYNC_SAMPLE_RATE_1

1001 = ASYNC_SAMPLE_RATE_2

All other codes are Reserved.

The selected sample rate is valid in the

range 8kHz to 192kHz.

R48

(0030h)

PWM

Drive 1

14:11

PWM_RATE [3:0]

0000

PWM Frequency (sample rate)

0000 = SAMPLE_RATE_1

0001 = SAMPLE_RATE_2

0010 = SAMPLE_RATE_3

1000 = ASYNC_SAMPLE_RATE_1

1001 = ASYNC_SAMPLE_RATE_2

All other codes are Reserved.

The selected sample rate is valid in the

range 4kHz to 192kHz.

All PWMnMIX_SRCm registers should be

set to 00h before changing PWM_RATE.

R112

0070h)

Comfort

Noise

Generator

14:11

NOISE_GEN_RA

TE [3:0]

0000

Noise Generator Sample Rate

0000 = SAMPLE_RATE_1

0001 = SAMPLE_RATE_2

0010 = SAMPLE_RATE_3

1000 = ASYNC_SAMPLE_RATE_1

1001 = ASYNC_SAMPLE_RATE_2

All other codes are Reserved.

The selected sample rate is valid in the

range 4kHz to 192kHz.

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