AD1986A Datasheet, PDF (44/56 Pages) Analog Devices – AC ’97 and HD Audio SoundMAX Codec

AD1986A
Register
DMIX [1:0]
(DOWN MIX Mode
Select)
SODIS
(Surround Output
Enable)
MSPLT (RO)
(Mute Split)
AC ‘97NC (RO)
(AC ‘97 No Compatibility
Mode)
DACZ
(DAC Zero-Fill)
x
Function
Provides analog down-mixing of the center, LFE, and/or surround channels into the mixer channels. This allows
the full content of 5.1 or quad media to be played through stereo headphones or speakers. The jack sense pins
can also be set up to control (gate) this function depending on the JS0DMx and JS1DMx Bits (0x72 D [14:13]).
DMIX [1:0]
Down-Mix State
Default
0x
No down-mix unless activated by jack sense
Default
10
Selects 6-to-4 down mix. The center and LFE channels are
summed equally into the Mixer L/R channels
11
Selects 6-to-2 down mix. In addition to the center and LFE
channels, the SURROUND channels are summed into the
mixer L/R channels
Controls the Hi-Z state of the SURROUND output pins. Pins are placed into a Hi-Z mode by software control or
when they are selected as inputs to the LINE_IN selector (see the LISEL [1:0] bits 0x76 D [03:02]).
CLDIS
SURROUND_OUT State
0
Outputs enabled
Default
1
Outputs three-stated (Hi-Z)
Separates the left and right mutes on all volume registers. This bit is read-only 1 (one) on the AD1986A,
indicating that mute split is always enabled.
Changes addressing to ADI model (vs. true AC ’97 definition). This bit is read-only 1 (one) on the AD1986A,
indicating that ADI addressing is always enabled.
Determines DAC data fill under starved condition.
DACZ
DAC Fill State
0
DAC data is repeated when DACs are starved for data
1
DAC data is zero-filled when DACs are starved for data
Reserved.
Default
Default: 0
Rev. 0 | Page 44 of 56