
User’s Manual U14579EJ2V0UM
19
15.3.20
ADC1_CTRL (offset address: 0x54)....................................................................................... 370
15.3.21
ADC1L (offset address: 0x58) ................................................................................................ 371
15.3.22
ADC1_BADDR (offset address: 0x5C)................................................................................... 372
15.3.23
ADC2_CTRL (offset address: 0x60)....................................................................................... 373
15.3.24
ADC2L (offset address: 0x64) ................................................................................................ 374
15.3.25
ADC2_BADDR (offset address: 0x68) ................................................................................... 375
15.3.26
ADC3_CTRL (offset address: 0x6C) ...................................................................................... 376
15.3.27
ADC3L (offset address: 0x70) ................................................................................................ 377
15.3.28
ADC3_BADDR (offset address: 0x74) ................................................................................... 378
15.4
AC97 Interface Configuration................................................................................................379
15.5
AC97U Function Overview.....................................................................................................380
15.5.1
Block diagram ........................................................................................................................ 380
15.5.2
AC-Link interface support format ........................................................................................... 381
15.5.3
Cache buffer........................................................................................................................... 381
15.5.4
DMA control ........................................................................................................................... 382
15.5.5
Interrupt control ...................................................................................................................... 383
15.5.6
SRC (sample rate converter).................................................................................................. 383
15.6
AC-Link Interface Data Transfer Format ..............................................................................386
15.7
Data Output to Codec.............................................................................................................392
15.8
Data Input from Codec ...........................................................................................................393
15.9
DMA Transfer ..........................................................................................................................394
15.10 Special Interrupts ...................................................................................................................399
15.11 AC97U Suspend Transition Procedure ................................................................................400
15.12 Filter RAM................................................................................................................................401
APPENDIX A CAUTIONS.......................................................................................................................402
A.1
Adjusting Skew of PCI Clock.................................................................................................402
APPENDIX B RESTRICTIONS...............................................................................................................403
B.1
Noise During Operation of AC97...........................................................................................403
B.1.1
Phenomenon .......................................................................................................................... 403
B.1.2
Preventive measures ............................................................................................................. 403
B.2
Erroneous Recognition of PC Card ......................................................................................404
B.2.1
Phenomenon .......................................................................................................................... 404
B.2.2
Preventive measures ............................................................................................................. 405
B.3
Pulling up PC Card Pins ........................................................................................................406
B.3.1
Phenomenon .......................................................................................................................... 406
B.3.2
Preventive measures ............................................................................................................. 406
B.4
Incorrect Playback with AIU ..................................................................................................407
B.4.1
Phenomenon .......................................................................................................................... 407
B.4.2
Preventive measures ............................................................................................................. 407
APPENDIX C INDEX...............................................................................................................................408