CS4297A datasheet(28/52 Pages) CIRRUS

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CS4297A

4.14

Extended Audio ID Register (Index 28h)

ID[1:0]

Codec Configuration ID. When ID[1:0] = 00, the CS4297A is the primary audio codec. When

ID[1:0] = 01, 10, or 11, the CS4297A is a secondary audio codec. The state of the ID[1:0] bits

is determined at power-up from the ID[1:0]# pins.

AMAP

Audio Slot Mapping. The AMAP bit indicates whether the optional AC ’97 2.1 compliant AC-link

slot to audio DAC mapping is supported. This bit is a shadow of the AMAP bit in the AC Mode

Control Register (Index 5Eh). The PCM playback and capture slots are mapped according to

Table 7 on page 29.

VRA

Variable Rate PCM Audio. The VRA bit indicates whether variable rate PCM audio is supported.

This bit always returns ‘0’, indicating that variable rate PCM audio is not available.

Default

x200h. Where x is determined by the state of ID[1:0]# input pins. The Extended Audio ID Reg-

ister (Index 28h) is a read only register.

4.15

PCM Front DAC Rate Register (Index 2Ch)

SR[15:0]

Front DAC Sample Rate. The SR[15:0] bits are read-only bits, and always read BB80h indicat-

ing 48 kHz sample rate.

Default

BB80h. This value corresponds to 48 kHz sample rate.

4.16

PCM L/R ADC Rate Register (Index 32h)

SR[15:0]

Left/Right ADC Sample Rate. The SR[15:0] bits are read-only bits, and always read BB80h in-

dicating 48 kHz sample rate.

Default

BB80h. This value corresponds to 48 kHz sample rate.

D15

D14

D13

D12

D11

D10

ID1

ID0

AMAP

VRA

D15

D14

D13

D12

D11

D10

SR15

SR14

SR13

SR12

SR11

SR10

SR9

SR8

SR7

SR6

SR5

SR4

SR3

SR2

SR1

SR0

D15

D14

D13

D12

D11

D10

SR15

SR14

SR13

SR12

SR11

SR10

SR9

SR8

SR7

SR6

SR5

SR4

SR3

SR2

SR1

SR0

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