CS4297 datasheet(27/46 Pages) CIRRUS

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DS242F5

CS4297

CrystalClear™ SoundFusion™ Audio Codec ’97

Powerdown Control/Status Register (Index 26h)

The bits in this register correspond to the AC’97 defined powerdown and status functions. See the follow-

ing tables for the definitions of the individual bits which the CS4297 supports.

Reserved Registers (Index 28h - 58h)

These registers are reserved for future use by the AC’97 specification. The CS4297 ignores writes to these

registers.

Crystal Revision and Fab ID Register (Index 5Ah)

This vendor reserved register is being used by the CS4297 to indicate the revision level of the CS4297 as

well as the Fab ID where the part was manufactured. This is in addition to the Vendor ID registers located

below. The revision level is indicated in bits D11:8 and will be 03h for the release revision of the chip.

The Fab ID is indicated in bits D3:0 and will be 01h.

D15

D14

D13

D12

D11

D10

PR6

PR5

PR4

PR3

PR2

PR1

PR0

REF

ANL

DAC

ADC

Bit Name

Function

REF

Vref at nominal levels

ANL

Analog Mixers, Mux, and Vol-

ume Controls ready

DAC

DAC ready to accept data

ADC

ADC ready to transmit data

Table 6. Codec Powerdown Status Bits

D15

D14

D13

D12

D11

D10

Bit Name

Function

PR0

ADCs and Input Mux Powerdown

PR1

DACs Powerdown

PR2

Analog Mixer Powerdown (Vref still on)

PR3

Analog Mixer Powerdown (Vref off)

PR4

AC-Link Powerdown (BIT_CLK off)

PR5

Internal Clock Disable

PR6

Alternate Line Output Buffer Powerdown

Table 7. Codec Powerdown Control Bits

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