CS4294SLASHCS4298 datasheet(38/81 Pages) CIRRUS

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CS4205

DS489PP4

5.17

Audio Sample Rate Control Registers (Index 2Ch - 34h)

SR[15:0]

Sample Rate Select. The Audio Sample Rate Control Registers (Index 2Ch - 34h) control

playback and capture sample rates. The PCM Front DAC Rate Register (Index 2Ch) controls

the Front Left and Front Right DAC sample rates. The PCM L/R ADC Rate Register

(Index 32h) controls the Left and Right ADC sample rates. The Mic ADC Rate Register (Index

34h) controls the Microphone ADC sample rate. There are ten sample rates directly support-

ed by this register, shown in Table 12. Any value written to this register not contained in

Table 12 is not directly supported and will be decoded according to the ranges indicated in

the table. The range boundaries have been chosen so that only bits SR[15:11] of each regis-

ter will have to be considered. All register read transactions will reflect the actual value stored

(column 2 in Table 12) and not the one attempted to be written.

Default

BB80h. This value corresponds to 48 kHz sample rate.

Writes to the PCM Front DAC Rate Register (Index 2Ch) and the PCM L/R ADC Rate Register (Index 32h) are only

available in Variable Rate PCM Audio mode when the VRA bit in the Extended Audio Status/Control Register

(Index 2Ah) is ‘set’. If VRA = 0, writes to the register are ignored and the register will always read BB80h. Writes to

the Mic ADC Rate Register (Index 34h) are only available in Variable Rate Mic Audio mode when the VRM bit in the

Extended Audio Status/Control Register (Index 2Ah) is ‘set’. If VRM = 0, writes to the register are ignored and the

D15

D14

D13

D12

D11

D10

SR15

SR14

SR13

SR12

SR11

SR10

SR9

SR8

SR7

SR6

SR5

SR4

SR3

SR2

SR1

SR0

Index

SRC

SRC Enable Bit

(Index 2Ah)

2Ch

PCM Front DAC Rate

VRA

32h

PCM L/R ADC Rate

VRA

34h

Mic ADC Rate

VRM

Table 11. Audio Sample Rate Control Register Index

Sample Rate

(Hz)

SR[15:0], register

content (hex value)

SR[15:0], decode

range (hex value)

SR[15:11], decode

range (bin value)

8,000

1F40

0000 - 1FFF

00000 - 00011

9,600

2580

2000 - 27FF

00100 - 00100

11,025

2B11

2800 - 2FFF

00101 - 00101

13,714

3592

3000 - 37FF

00110 - 00110

16,000

3E80

3800 - 47FF

00111 - 01000

22,050

5622

4800 - 57FF

01001 - 01010

24,000

5DC0

5800 - 6FFF

01011 - 01101

32,000

7D00

7000 - 8FFF

01110 - 10001

44,100

AC44

9000 - AFFF

10010 - 10101

48,000

BB80

B000 - FFFF

10110 - 11111

Table 12. Directly Supported SRC Sample Rates for the CS4205

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