AD1980 Analog Devices, AD1980 Datasheet - Page 18

• Manufacturer Part Number: AD1980
• Description: AD1980 AC'97 SoundMAX® Codec W/spdif W/eq
• Manufacturer: Analog Devices

AD1980
The extended audio ID register identifies which extended audio features are supported. A nonzero extended audio ID value indicates one or more of the extended
audio features are supported. All registers not shown and bits containing an X are assumed to be reserved.
VRA
DRA
SPDIF
DSA[1,0]
CDAC
SDAC
LDAC
AMAP
REV[1,0]
ID[1:0]
Reg
No. Name
28h Ext’d Audio
Variable Rate PCM Audio Support (Read Only).
This bit returns a “1” when read to indicate that the Variable Rate PCM Audio is supported.
Double Rate Audio (Read Only).
This bit returns a “1” when read to indicate that the optional Double Rate RCM Audio is supported for PCM L
and PCM R.
SPDIF Support (Read Only). This bit returns a “1” when read to indicate that the SPDIF transmitter is supported
(IEC958).
This bit is also used to validate that the SPDIF transmitter output is actually enabled. The SPDIF bit is only
allowed to be set high if the SPDIF pin (48) is pulled down at power-up, enabling the codec transmitter logic. If the
SPDIF pin is floating or pulled high at power-up, the transmitter logic is disabled and therefore this bit returns a
low, indicating that the SPDIF transmitter is not available. This bit must always be read back to verify that the
SPDIF transmitter is actually enabled.
DAC Slot Assignments (Read/Write) (Reset Default = 00)
00
01
10
11
PCM CENTER DAC Support (Read Only).
This bit returns a “1” when read to indicate that PCM center DAC is supported.
PCM Surround DAC Support (Read Only).
This bit returns a “1” when read to indicate that PCM surround left and right DACs are supported.
PCM LFE DAC Support (Read Only),
This bit returns a “1” when read to indicate that PCM LFE DAC is supported.
Slot DAC Mappings Based on Codec ID (Read Only).
This bit returns a “1” when read to indicate that slot/DAC mappings based on codec ID are supported.
REV[1,0] = 01 indicates codec is AC ’97 revision 2.2 compliant (Read Only).
Indicates Codec Configuration (Read Only).
00 = Primary
01, 10, 11 = Secondary
D15 D14 D13 D12 D11
ID1 ID0 X
DACs 1, 2 = 3 and 4
DACs 1, 2 = 7 and 8
DACs 1, 2 = 6 and 9
Reserved
NORMAL
Figure 8. One Example of AC ‘97 Power-Down/Power-Up Flow
PR0 = 1
ADC = 1
READY = 1
PR0 = 0
X
AND
ADCs OFF
REV1 REV0 AMAP LDAC SDAC CDAC
PR0
Extended Audio ID Register (Index 28h)
DACs 3, 4 = 7 and 8
DACs 3, 4 = 6 and 9
DACs 3, 4 = disabled
D10
PR1 = 1
DAC = 1
PR1 = 0
AND
D9
DACs OFF
PR1
D8
DEFAULT
PR2 = 1
–18–
ANL = 1
PR2 = 0
AND
D7
ANALOG
PR2 OR
OFF
PR3
DACs 5, 6 = 6 and 9
DACs 5, 6 = disabled
DACs 5, 6 = disabled
D6
PR4 = 1
RESET
RESET
WARM
COLD
D5
DSA1
DIGITAL I/F
OFF
PR4
DSA0
D4
D3 D2
X
SHUT OFF
AC-LINK
SPDIF DRA VRA
D1
D0
REV. 0
Default
X3C7h