Audio Codec '97 Revision 2.1

AC ‘97 Component Specification Revision 2.1
6.1.1 PCM out path and optional 3D bypass............................................................................................... 37
6.2 MIXER INPUT......................................................................................................................................... 37
6.3 MIXER REGISTERS ................................................................................................................................. 38
6.3.1 Reset Register (Index 00h)................................................................................................................. 39
6.3.2 Play Master Volume Registers (Index 02h, 04h and 06h).................................................................... 40
6.3.3 Master Tone Control Registers (Index 08h)........................................................................................ 41
6.3.4 PC Beep Register (Index 0Ah) ........................................................................................................... 41
6.3.5 Analog Mixer Input Gain Registers (Index 0Ch - 18h)........................................................................ 42
6.3.6 Record Select Control Register (Index 1Ah)....................................................................................... 42
6.3.7 Record Gain Registers (Index 1Ch and 1Eh)...................................................................................... 43
6.3.8 General Purpose Register (Index 20h) ............................................................................................... 44
6.3.9 3D Control Register (Index 22h)........................................................................................................ 44
6.3.10 Reserved (was Modem Sample Rate Register) (Index 24h).............................................................. 45
6.3.11 Powerdown Control/Status Register (Index 26h) ............................................................................ 45
6.3.12 Extended Audio Registers (Index 28h – 3Ah).................................................................................. 46
6.3.13 Extended Modem Registers (Index 3Ch – 58h) ............................................................................... 46
6.3.14 Vendor Reserved Registers (Index 5Ah - 7Ah) ................................................................................ 46
6.3.15 Vendor ID Registers (Index 7Ch - 7Eh).......................................................................................... 46
7. LOW POWER MODES ............................................................................................................................. 47
8. TESTABILITY........................................................................................................................................... 49
8.1 ACTIVATING THE TEST MODES............................................................................................................... 49
8.2 TEST MODE FUNCTIONS......................................................................................................................... 49
8.2.1 ATE in circuit test mode .................................................................................................................... 49
8.2.2 Vendor-specific test mode.................................................................................................................. 49
9. AC-LINK DIGITAL DC AND AC CHARACTERISTICS....................................................................... 50
9.1 DC CHARACTERISTICS........................................................................................................................... 50
9.2 AC TIMING CHARACTERISTICS............................................................................................................... 51
9.2.1 Reset................................................................................................................................................. 51
9.2.1.1 Cold Reset ................................................................................................................................................ 51
9.2.1.2 Warm Reset .............................................................................................................................................. 51
9.2.2 Clocks............................................................................................................................................... 52
9.2.3 Data Setup And Hold......................................................................................................................... 53
9.2.4 Signal Rise and Fall Times ................................................................................................................ 53
9.2.5 AC-link Low Power Mode Timing...................................................................................................... 54
9.2.6 ATE Test Mode.................................................................................................................................. 54
10. ANALOG PERFORMANCE CHARACTERISTICS ........................................................................... 55
11. AC ’97 2.0 EXTENSIONS ...................................................................................................................... 56
11.1 INTRODUCTION...................................................................................................................................... 56
11.2 OVERVIEW OF EXTENDED AC ’97 2.0 FUNCTIONALITY........................................................................... 56
11.2.1 AC ’97 2.0 Audio........................................................................................................................... 56
11.2.2 AMC ’97 2.0 Combined Audio and Modem AFE ............................................................................ 57
11.2.3 MC ’97 2.0 Modem AFE................................................................................................................ 58
11.3 EXTENDED AC ’97 2.0 REGISTER SUMMARY.......................................................................................... 59
APPENDIX A. AC ’97 2.0 VARIABLE SAMPLE RATE EXTENSION ......................................................... 60
A.1 INTRODUCTION...................................................................................................................................... 60
A.2 EXTENDED AUDIO REGISTER DEFINITIONS ............................................................................................. 60
A.2.1 Extended Audio ID Register (Index 28h) ........................................................................................ 60
A.2.2 Extended Audio Status and Control Register (Index 2Ah) ............................................................... 61
A.2.3 Audio Sample Rate Control Registers (Index 2Ch - 34h)................................................................. 61
A.2.4 6-Channel Volume Control Register (Index 36h and 38h)............................................................... 62
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May 22, 1998