VT1616 6-Channel AC97 Codec with S/PDIF
Revision 1.5, October 11, 2002
8
Data Sheet
Register Descriptions
Reset Register (Index 00h)
The Reset register is used to configure the hardware to a known state or to read the ID code of the part. A code was
assignedto VIA Technologies (27 = 11011h) for 3D Stereo Enhancement reflectedin SE[4:0]. ID8 andID6 are set to 1b
to report that the ADC andDAC are 20-bit resolution respectively. The VT1616 supports an alternate line level out with
independent volume control as reflectedby ID4=1b. However, since pins 39 and41 are sharedwith the SurroundDAC
outputs, register 5Ah, bit 15, LVL has to be set to “1”. Writing data to this register will set all the mixer registers to their
default values. For description of the bits set to 0b, refer to AC’97 Rev. 2.2 spec.
Stereo Output Control Register (Index 02h)
Mute
Stereo Output Mute Control
“1” :
Mute enabled
“0” :
Mute disabled
ML[4:0]
Master Output (Left Channel) Volume Control
These five bits select the level of attenuation appliedto the Left channel of the Stereo Output
signal. The level of attenuation is programmable from 0dB to -46.5dB in 1.5dB increments,
providing a total of 32 programmable levels. Please refer to Table 2 on page 10 for details.
MR[4:0]
Master Output (Right Channel) Volume Control
These five bits select the level of attenuation appliedto the Right channel of the Stereo Output
signal. The level of attenuation is programmable from 0dB to -46.5dB in 1.5dB increments,
providing a total of 32 programmable levels. Please refer to Table 2 on page 10 for details.
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
Default
–
SE4
SE3
SE2
SE1
SE0
ID9
ID8
ID7
ID6
ID5
ID4
ID3
ID2
ID1
ID0
6D50h
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
Default
Mute
–
–
ML4
ML3
ML2
ML1
ML0
–
–
–
MR4
MR3
MR2
MR1
MR0
8000h
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