CS43131 datasheet(91/156 Pages) CIRRUS

91 / 156 page

DS1155F1

CS43131

5.13 Example Sequences

Set ASP sample bit size. XSP is

don't care

Serial Port Sample Bit Size. 0x1000C

0x04

Reserved

XSP_SPSIZE

ASP_SPSIZE

0000

XSP sample bit size is don't care

ASP sample bit size set to 32 bits

Set ASP numerator

ASP Numerator 1. 0x40010

0x01

ASP_N_LSB

0x01

LSB of ASP sample rate fractional divide numerator

ASP Numerator 2. 0x40011

0x00

ASP_N_MSB

0x00

MSB of ASP sample rate fractional divide numerator

Set ASP denominator

ASP Denominator 1. 0x40012

0x08

ASP_M_LSB

0x08

LSB of ASP sample rate fractional divide denominator

ASP Denominator 2. 0x40013

0x00

ASP_M_MSB

0x00

MSB of ASP sample rate fractional divide denominator

Set ASP LRCK high time

ASP LRCK High Time 1. 0x40014

0x1F

ASP_LCHI_LSB

0x1F

LSB of ASP LRCK high time duration

ASP LRCK High Time 2. 0x40015

0x00

ASP_LCHI_MSB

0x00

MSB of ASP LRCK high time duration

Set ASP LRCK period

ASP LRCK Period 1. 0x40016

0x3F

ASP_LCPR_LSB

0x3F

LSB of ASP LRCK period

ASP LRCK Period 2. 0x40017

0x00

ASP_LCPR_MSB

0x00

MSB of ASP LRCK period

Configure ASP clock

ASP Clock Configuration. 0x40018

0x0C

Reserved

ASP_M/SB

ASP_SCPOL_OUT

ASP_SCPOL_IN

ASP_LCPOL_OUT

ASP_LCPOL_IN

000

Set ASP port to be Slave

Configure clock polarity for I2S input

Configure ASP frame

ASP Frame Configuration. 0x40019

0x0A

Reserved

ASP_STP

ASP_5050

ASP_FSD

000

010

Configure ASP port to accept I2S input

Set ASP channel location

ASP Channel 1 Location. 0x50000

0x00

ASP_RX_CH1

0x00

ASP Channel 1 starts on SCLK0

ASP Channel 2 Location. 0x50001

0x00

ASP_RX_CH2

0x00

ASP Channel 2 starts on SCLK0

Set ASP channel size and enableASP Channel 1 Size and Enable.

0x5000A

0x07

Reserved

ASP_RX_CH1_AP

ASP_RX_CH1_EN

ASP_RX_CH1_RES

0000

ASP Channel 1 active phase

ASP Channel 1 enable

ASP Channel 1 size is 32 bits

ASP Channel 2 Size and Enable.

0x5000B

0x0F

Reserved

ASP_RX_CH2_AP

ASP_RX_CH2_EN

ASP_RX_CH2_RES

0000

ASP Channel 2 active phase

ASP Channel 2 enable

ASP Channel 2 size is 32 bits

Configure PCM interface. HPF filter is used. Deemphasis off.

Configure PCM Filter

PCM Filter Option. 0x90000

0x02

FILTER_SLOW_FASTB

PHCOMP_LOWLATB

NOS

Reserved

PCM_WBF_EN

HIGH_PASS

DEEMP_ON

0 0

High Pass Filter is selected

Set Volume for Channel B

PCM Volume B. 0x90001

0x00

PCM_VOLUME_B

0x00

Set volume to 0 dB

Set Volume for Channel A

PCM Volume A. 0x90002

0x00

PCM_VOLUME_A

0x00

Set volume to 0 dB

Example 5-14. Switching from Analog-In to PCM Playback (Cont.)

STEP

TASK

VALUE

DESCRIPTION

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