Revision 1.5, October 11, 2002
19
Data Sheet
VT1616 6-Channel AC97 Codec with S/PDIF
Extended Audio ID Register (Index 28h)
The Extended Audio ID is a read only register that indicates the capabilities of the VT1616.
ID[1:0]
(See Table below)
One primary and an additional codec may be supported as an option. Since the VT1616 codec has
all six outputs implemented, the ID pin setting affects only the BIT_CLK direction and the register
decoding. BIT_CLK output the power-up default. Setting the codec besides default changes
BIT_CLK to input mode. As indicated by D9, AMAP=0, there is no need to change slot mappings.
Table 5.Multiple Codec Mode Status Bits
Note:
The state of the ID pins is reportedin reverse polarity on register 28h, bits D15 andD14. If you use this table to configure the codec via
pins 45 and46, use the inverse values. Please, refer to Figure 4 on page 27. BIT_CLK is an output for the primary codec and an input
pin for the controller and secondary codecs. ID[1:0] pins with internal pull-up resistors defaults codec as primary codec
.
AMAP
Slot/DAC mapping based on Codec ID
“0” :
Feature not applicable since all possible channels are available on VT1616.
xDAC
Multi-channel Output Capabilities
“1”:
LDAC, SDAC, CDAC report to the querying host that the codec has all six outputs
implemented.
SPDIF
Sony/Philips Digital Audio Interface
“1” :
Feature implementedin compliance to “S/PDIF Output for AC ‘97, Rev 1.0”
“0” :
Indicates that SPDIF_OUT pin 48 is left floating or pulled-high. It reflects the lack of
external S/PDIF application circuitry.
VRA
Variable Sampling Rate PCM Audio
“1” :
Feature implementedin compliance to AC ‘97 2.2 Appendix A
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
Default
ID1
ID0
–
–
–
–
AMAP LDAC SDAC CDAC
–
–
–
SPDIF
–
VRA
01Exh
ID1
ID0
Codec Mode
0
0
Primary Codec (default)
0
1
Secondary Codec
1
0
Invalid
1
1
Invalid
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