ALC202 Просмотр технического описания (PDF) - Realtek Semiconductor

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ALC202

TWO CHANNEL AC97 AUDIO CODEC

Realtek Semiconductor 

ALC202/ALC202A

6.1.18 MX28 Extended Audio ID

Default: 0605h

The Extended Audio ID register is a read only register used to communicate information to the digital controller on two functions. ID1

and ID0 echo the configuration of the CODEC as defined by the programming of pins 45 and 46 externally. “00” returned defines the

CODEC as the primary CODEC, while any other code identifies the CODEC as one of three secondary CODEC possibilities.

Bit Type

Function

15

14

13:12

11:10

9

8:6

5:4

3

2

1

0

R ID1

R ID0

Reserved, Read as 0

R REV[1:0]=01 to indicate that the ALC202 is AC’97 rev2.2 compliant

R AMAP read as 1 (DAC mapping based on ID)

Reserved, Read as 0

R/W DAC Slot Assignment DSA[1:0] (Default value depends on ID[1:0])

DSA[1:0] Controls the DAC slot assignment, as described in AC’97 rev2.2.

Reserved, Read as 0

R SPDIF Read as 1 (S/PDIF is supported)

R DRA Read as 1

R VRA Read as 1 (Variable Rate Audio is supported)

ID[1:0] depend on the states of pins 46, 45, 44, and 43 when power-on reset or AC97_RESET# is active. Refer to

section 9.1 for detailed information on configuration of ID[1:0].

The ALC202 maps DAC slot according to the following table: (default maps to AC’97 spec. rev2.2)

DSA[1:0]

0,0

0,1

1,0

1,1

Left DAC slot #

3

7

6

10

Right DAC slot #

Comment

4

Default when ID[1:0]=00

8

Default when ID[1:0]=01,10

9

Default when ID[1:0]=11

11

-

2002/07/30

17

Rev.1.28

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