alc850 Realtek Semiconductor Corporation, alc850 Datasheet - Page 26

• Manufacturer Part Number: alc850
• Description: Eight Channel Ac?97 2.3 Audio Codec
• Manufacturer: Realtek Semiconductor Corporation

7.1.16.
Default: 09C4H
The Extended Audio ID register is a read-only register used to communicate information to the digital
controller.
7.1.17.
Default: 05F0H
This register contains two active bits for power-down and status of the surrounding DACs. Bits 1 & 2 are
read/write bits that are used to enable or disable DRA and S/PDIF respectively. Bits 4 & 5 are read/write
bits used to determine the AC-LINK slot assignment of the S/PDIF. Bits 6, 7, & 8 are read-only bits that
tell the controller when the Center, Surround, and LFE DACs are ready to receive data. Bit 10 is a read-
only bit that tells the controller if the S/PDIF configuration is valid. Bits 11, 12, & 13 are read/write bits
that are used to power down the Center, Surround, and LFE DACs respectively.
Eight Channel AC’97 2.3 Audio Codec
15:14
13:12
11:10
5:3
Bit
Bit
15
14
13
12
10
11
9
8
7
6
2
1
0
MX28 Extended Audio ID
MX2A Extended Audio Status and Control Register
Type
Type
R/W
R/W
R/W
R/W
R
R
R
R
R
R
R
R
R
R
-
-
-
Function
ID[1:0]. Always read as 0 (Only primary ID is supported)
Reserved. Read as 0
REV [1:0]=10 to indicate that the ALC850 is AC’97 rev. 2.3 compliant
AMAP. Read as 0
LDAC. Read as 1 (LFE DAC is supported, in compliance with AC’97 rev. 2.3)
SDAC. Read as 1 (Surround DAC is supported, in compliance with AC’97 rev. 2.3)
CDAC. Read as 1 (Center DAC is supported, in compliance with AC’97 rev. 2.3)
Reserved. Read as 0
S/PDIF. Read as 1 (S/PDIF output is supported)
DRA. Read as 0 (Double Rate Audio is not supported)
VRA. Read as 0 (Variable Rate Audio is not supported)
Function
Validity Configuration of S/PDIF Output (VCFG)
Combines with MX3A.15 to decide validity control in S/PDIF output signal
Reserved
Power Down LFE DAC (PRK)
0: Normal
1: Power down LFE DAC
Power Down Surround DAC (PRJ)
0: Normal
1: Power down Surround DAC
Power Down Center DAC (PRI)
0: Normal
1: Power down Center DAC
SPCV (S/PDIF Configuration Valid)
0: Current S/PDIF configuration (SPSA, SPSR, DAC/slot rate) is not valid
1: Current S/PDIF configuration (SPSA, SPSR, DAC/slot rate) is valid
Table 22. MX2A Extended Audio Status and Control Register
Table 21. MX28 Extended Audio ID
18
Track ID: JATR-1076-21 Rev. 1.4
Datasheet
ALC850