CS4297 datasheet(18/46 Pages) CIRRUS

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DS242F5

CS4297

CrystalClear™ SoundFusion™ Audio Codec ’97

AC-Link Audio Input Frame

An AC-Link serial data input frame uses the

SYNC, BIT_CLK, and SDATA_IN signals are

used. In the serial data input frame, data is passed

on the SDATA_IN pin FROM the CS4297 TO the

AC’97 Controller. The data format for the input

frame is very similar to the output frame. Synchro-

nization of the CS4297 to the AC’97 Controller is

performed in the same manner. Please refer to Fig-

ure 3 for the serial port timing waveform.

Slot 0: Serial Data Input Slot Tag Bits

The first slot, Slot 0, is a 16-bit slot which contains information about the validity of data for the remaining

12 slots. The 16 bits of this slot are defined as:

Codec Ready - Bit 15 indicates the readiness of the CS4297’s AC-Link and the AC’97 Control and Status

Registers. Immediately after a Cold Reset this bit will be returned to the AC’97 Controller ‘cleared’. Once

the CS4297’s clocks and voltages are stable, this bit will be set. Until the Codec Ready bit is ‘set’, no AC-

Link transactions should be attempted by the AC’97 Controller.

NOTE: This Codec Ready bit does not indicate readiness of the DACs, ADCs, Vref, or any other analog

function. Those must be checked in the Powerdown/Status Register by the AC’97 Controller. Any accesses

to the CS4297 while this bit is ‘cleared’ will be ignored.

Slot 1 Valid - Bit 14 indicates the validity of data in the serial data input Slot 1. If this bit is ‘set’, Slot 1

contains valid data. If this bit is ‘cleared’, Slot 1 should be ignored by the AC’97 Controller.

Slot 2 Valid - Bit 13 indicates the validity of data in the serial data input Slot 2. If this bit is ‘set’, Slot 2

contains valid data. If this bit is ‘cleared’, Slot 2 should be ignored by the AC’97 Controller.

Slot 3 Valid - Bit 12 indicates the validity of data in the serial data input Slot 3. If this bit is ‘set’, Slot 3

contains valid data. If this bit is ‘cleared’, Slot 3 should be ignored by the AC’97 Controller.

Slot 4 Valid - Bit 11 indicates the validity of data in the serial data input Slot 4. If this bit is ‘set’, Slot 4

contains valid data. If this bit is ‘cleared’, Slot 4 should be ignored by the AC’97 Controller.

Slot 0 bits 10 through 0 represent unimplemented data slots in the CS4297 and should be ignored by the

AC’97 Controller.

F10

F11

F12

F13

F14

F15

Bit 15

765

43210

Codec

Ready

Slot 1

Valid

Slot 2

Valid

Slot 3

Valid

Slot 4

Valid

Not Used

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