CS47L24 datasheet(83/256 Pages) CIRRUS

83 / 256 page

CS47L24

Rev 4.1

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 DSP2_RATE and DSP3_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 21. Refer to the register descriptions for details of the valid

selections in each case. Note that the input (DMIC) 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 22 and Table 23 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.

R144

0090h)

Haptics

Control 1

14:11

HAP_RATE [3:0]

0000

Haptic Signal 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.

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