STAC9750 Datasheet, PDF (52/73 Pages) Integrated Device Technology – VALUE-LINE TWO-CHANNEL AC’97 CODECS

STAC9750/9751
VALUE-LINE TWO-CHANNEL AC’97 CODECS
PC AUDIO
6.5.25.2. ADC Data on AC LINK
Bits D5-D4 select slots for ADC data on ACLINK.
Value
00
01
10
11
Table 36. ADC data on AC LINK
Function
left slot 3, right slot 4
left slot 7, right slot 8
left slot 6, right slot 9
left slot 10, right slot 11
6.5.25.3. MuteFix Disable
Bit D6 controls the enable and disable of the MuteFix functions.
• 0 = MUTE FIX Enabled
• 1 = MUTE FIX Disabled
When this bit is zero, and either channel is set to -46.5dB attenuation (1Fh), then that channel is fully
muted. When this bit is one, then operation is per AC’97 specification.
This bit is reserved in revisions prior to CC1.
6.5.25.4. Mic Boost Select
The Mic boost value can be selected with bit D2, which in enabled by Register 0Eh, bit D6. Writing a
zero to bit D2 will provide 20dB of Mic Boost. Writing a one will provide 30dB of Mic Boost.
Value
0
1
Table 37. Mic Boost Select
Function
20dB
30dB
6.5.25.5. Supply Override Select
The Supply Override bit, D1, allows override of the supply detect. Writing a zero disables the over-
ride on supply detect. Writing a one, overrides supply detect with bit D0. Bit D0 provides the supply
override value. A zero forces 3.3 V analog operation and one forces 5 V analog operation.
IDT™
VALUE-LINE TWO-CHANNEL AC’97 CODECS
52
STAC9750/9751
V 5.8 103106