© 2004 Microchip Technology Inc. DS70074C-page 26-29
Section 26. Appendix
Appendix
26
C.4.6 Slot #5 (Modem Line 1)
Slot #5 in the SDATA_OUT signal is used for modem DAC data. The default resolution for
modem compatible AC ‘97 codecs is 16 bits. As in all time slots, the unused bits in the slot are
set to ‘0’.
Slot #5 in the SDATA_IN signal is used for the modem ADC data.
C.4.7 Slot #6
Slot #6 in the SDATA_OUT signal is used for PCM Center Channel DAC data in 4 or 6-channel
sound configurations.
Slot #6 in the SDATA_IN signal is used for dedicated microphone record data. The data in this
slot allows echo cancellation algorithms to be used for speakerphone applications.
C.4.8 Slot #7
Slot #7 in the SDATA_OUT signal is used for PCM Left Channel DAC data in 4 or 6-channel
sound configurations.
Slot #7 in the SDATA_IN signal is reserved for future use in the AC ‘97 Component
Specification.
C.4.9 Slot #8
Slot #8 in the SDATA_OUT signal is used for PCM Right Channel DAC data in 4 or 6-channel
sound configurations.
Slot #8 in the SDATA_IN signal is reserved for future use in the AC ‘97 Component
Specification.
C.4.10 Slot #9
Slot #9 in the SDATA_OUT signal is used for PCM LFE DAC data in 6-channel sound
configurations.
Slot #9 in the SDATA_IN signal is reserved for future use in the AC ‘97 Component
Specification.
C.4.11 Slot #10 (Modem Line 2)
Slot #10 is used for the modem line 2 ADC and DAC data in modem compatible devices.
C.4.12 Slot #11 (Modem Handset)
Slot #11 is used for the modem handset ADC and DAC data in modem compatible devices.
C.4.13 Slot #12 (GPIO Control/Status)
The bits in Slot #12 are used for reading and writing GPIO pins in the AC ‘97 codec. The GPIO
pins are provided for modem control functions on modem compatible devices.
Figure C-3: AC-Link Signal Connections
AC ‘97
Controller
AC
‘97
Codec
24.576
MHz
BIT_CLK
SYNC
SDATA_OUT
SDATA_IN
/RESET
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