STW5095 datasheet(32/69 Pages) STMICROELECTRONICS

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4 Control Registers

STw5095

32/69

4.6

Digital audio interfaces master mode and clock generators

CR#

(hex)

Description

D6D5

D3D2

D1D0

Def.

CR20 (14h)

DAOCK Frequency Ls byte

DAOCKF(7:0)

0000 0000

CR21 (15h)

DAOCK Frequency Ms byte

DAOCKF(15:8)

0000 0000

CR22 (16h)

DA Clock Generator Control

DAMAST

DAMASTGEN

ENDAOCK

DAOCK512

DAPCMF(1:0)

0000 0000

CR23 (17h)

ADOCK Frequency Ls byte

ADOCKF(7:0)

0000 0000

CR24 (18h)

ADOCK Frequency Ms byte

ADOCKF(15:8)

0000 0000

CR25 (19h)

AD Clock Generator

Control

ADMAST

ADMASTGEN

ENADOCK

ADOCK512

ADPCMF(1:0)

0000 0000

Bits

Name CR21-20

Name CR24-23

Value

CR21-20 and CR24-23 Description

Def.

15-0

DAOCKF(15:0)

ADOCKF(15:0)

The following formulas can be used to obtain the value of K for the

desired FS or OCK respectively in the clock generator

0000h

Note: CR21-20 and CR24-23 are meaningful in Master Mode Only.

KFS

()

round 2

AMCK

MCKCOEFF

⋅

--------------------------------------------------------------

⎝⎠

⎛⎞

KOCK

()

roun d 2

OC K

AMCK

MCKCOEFF

OSR

⋅

------------------------------------------------------------------------------------

⎝⎠

⎛⎞

FS:

Data Rate (DA_SYNC or AD_SYNC frequency in

Master Mode)

OCK:

Oversampled Clock Frequency

(DA_OCK or AD_OCK)

AMCK:

Input Master Clock Frequency

MCKCOEFF:

See CR30 for definition

OSR:

See bit 2 in CR22 and CR25

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