AD1986A Analog Devices, AD1986A Datasheet - Page 44

• Manufacturer Part Number: AD1986A
• Description: HD Audio SoundMAX Codec
• Manufacturer: Analog Devices

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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
4
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]
0x
10
11
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
0
1
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
0
1
Reserved.
Function
Down-Mix State
No down-mix unless activated by jack sense
Selects 6-to-4 down mix. The center and LFE channels are
summed equally into the Mixer L/R channels
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
SURROUND_OUT State
Outputs enabled
Outputs three-stated (Hi-Z)
DAC Fill State
DAC data is repeated when DACs are starved for data
DAC data is zero-filled when DACs are starved for data
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