CS4297 datasheet(2/46 Pages) CIRRUS

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DS242F5

CS4297

CrystalClear™ SoundFusion™ Audio Codec ’97

TABLE OF CONTENTS

CHARACTERISTICS AND SPECIFICATIONS.....................................................4

Analog Characteristics .................................................................................4

Mixer Characteristics....................................................................................5

Absolute Maximum Ratings .........................................................................5

Recommended Operating Conditions ..........................................................5

Power Down States......................................................................................6

Digital Filter Characteristics .........................................................................6

Digital Characteristics ..................................................................................7

Serial Port Timing.........................................................................................7

Serial Port Timing.........................................................................................8

PARAMETER AND TERM DEFINITIONS ..........................................................10

GENERAL DESCRIPTION .................................................................................12

Overview ...................................................................................................12

Digital Section ...........................................................................................12

AC-Link ...............................................................................................12

AC’97 Register Interface .....................................................................12

Power Management ............................................................................12

Analog Section ..........................................................................................12

Output Mixer .......................................................................................12

Input Mux ............................................................................................12

Volume Control ...................................................................................12

AC’97 IMPLEMENTATION ................................................................................13

DIGITAL HARDWARE DESCRIPTION ..............................................................15

AC’97 AC-Link ...........................................................................................15

AC-Link Protocol .................................................................................15

AC-Link Serial Data Output Frame ...........................................................15

Slot 0: Serial Data Output Slot Tags ...................................................16

Slot 1: AC’97 Register Address ..........................................................16

Slot 2: AC’97 Register Write Data ......................................................17

Slot 3: Left Channel PCM Playback Data ...........................................17

Slot 4: Right Channel PCM Playback Data .........................................17

AC-Link Audio Input Frame .......................................................................18

Slot 0: Serial Data Input Slot Tag Bits ................................................18

Slot 1: Read-Back Address Port .........................................................19

Slot 2: Read-Back Data Port ...............................................................19

Slot 3: Left Channel PCM Capture Data .............................................19

Slot 4: Right Channel PCM Capture Data ..........................................20

AC-Link Reset Modes ...............................................................................21

Cold AC’97 Reset ...............................................................................21

Warm AC’97 Reset .............................................................................21

AC’97 Register Reset .........................................................................21

AC-Link Protocol Violation - Loss of SYNC ...............................................21

Reset Register (Index 00h) .................................................................23

Master Volume (Index 02h) ................................................................23

Alternate Volume (Index 04h) .............................................................23

Master Mono Volume (Index 06h) ......................................................23

PC_BEEP Volume (Index 0Ah) ..........................................................24

Phone_In Volume (Index 0Ch) ...........................................................24

Microphone Volume (Index 0Eh) ........................................................24

Stereo Analog Mixer Input Gain Registers (Index 10 - 18h) ...............25

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