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
REGISTER INTERFACE.....................................................................................22
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
2
DS242F5
CIRRUS [ CIRRUS LOGIC ]
