CS49400 datasheet(84/100 Pages) CIRRUS

84 / 100 page

11.8 Creating Hardware Configuration

Messages

The single hardware configuration message that

must be sent to the CS49400 after download or soft

reset should be a concatenation of the messages in

the previous sections. The complete hardware

configuration message should be created by taking

a message for each parameter (where the default is

not acceptable) and concatenating the messages

together. No messages need to be sent if the default

configuration

for

particular

parameter

acceptable. This example can be easily expanded to

fit other system requirements.

E.g. if the host system has this configuration:

Address Checking: Disabled

This

the

default

configuration

configuration message is required.

DAI:Left Justified

PCM and Compressed data

CDI:Not used

The above configuration corresponds to

INPUT A1 B1

which corresponds to a configuration message of:

0x800210

0x3FBFC0

0x800110

0xC0002C

0x800217

0x8080FF

0x80021A

0x8080FF

0x800117

0x001000

0x80011A

0x001800

DAO:Left Justified slave mode (LRCLK,

SCLK inputs)

MCLK @ 256Fs

SCLK @ 64Fs

The above configuration corresponds to

OUTPUT A0B1C0D0

which has a configuration message of:

0x81800003

0xFFFE3FFF

0x81400003

0x0000C000

0x81000005

0x00101701

0x81000006

0x00100000

0x81000007

MCLK = 256 FS

SCLK = MCLK / 1 = 256 FS

LRCLK = SCLK / 256 = FS

0x81800003

0xFFFFFC7F

0x81400003

0x00000300

0x81000009

0x00377000

MCLK = 512 FS

SCLK = MCLK / 8 = 64 FS

LRCLK = SCLK / 64 = FS

0x81800003

0xFFFFFC7F

0x81400003

0x00000100

0x81000009

0x00077070

MCLK = 128FS

SCLK = MCLK / 2 = 64FS

LRCLK = SCLK / 64 = FS

0x81800003

0xFFFFFC7F

0x81400003

0x00000100

0x81000009

0x00077010

DValue

SCLK Polarity

Hex

Message

(default)

Data Valid on Rising Edge

(clocked out on falling)

0x81800003

0xFFFBFFFF

Data Valid on Falling Edge

(clocked out on rising)

0x81400003

0x00040000

Table 30. Output SCLK Polarity Configuration

(Parameter D)

C Value

SCLK/LRCLK Frequency

Hex

Message

Table 29. Output SCLK/LRCLK Configuration

(Parameter C)

CS49400 Datasheet(PDF) 84 Page - Cirrus Logic

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