alc250-lf Realtek Semiconductor Corporation, alc250-lf Datasheet - Page 21

• Manufacturer Part Number: alc250-lf
• Description: Two-channel Ac?97 2.3 Audio Codec With Equalizer
• Manufacturer: Realtek Semiconductor Corporation

6.1.21 MX2C PCM DAC Rate
Default: BB80h
The ALC250 allows adjustment of the output sample rate. This register is used to adjust the sample rate. By changing the values,
sampling rates from 8000 to 48000 can be chosen.
6.1.22 MX32 PCM ADC Rate
Default: BB80h
The ALC250 allows adjustment of the input sample rate. This register is used to adjust the sample rate. By changing the values,
sampling rates from 8000 to 48000 can be chosen.
Two-Channel AC’97 2.3 Audio Codec
15:0
15:0
Bit
Bit
SPCV is a read only bit that indicates whether the current S/PDIF-Out configuration is supported or not. If the
Note that If the value written is not support, the closest value is returned.
Note that If the value written is not support, the closest value is returned.
If DRA = 1, DAC operates at a fixed 96KHz sampling rate. The PCM(n) and PCM(n+1) data is captured in the same
frame. In this mode, MX2C is fixed at BB80h, MX32 and ADC is still controlled by VRA.
configuration is supported, SPCV is set as 1 by H/W. So driver can check this bit to determine the status of the
S/PDIF transmitter system. SPCV is always operating, independent of the SPDIF enable bit (MX2A.2). The
S/PDIF output is active if MX2A.2 is set in spite of SPCV. Once S/PDIF output is enabled but SPCV is invalid
(SPCV=0), channel status is still output, but the output data bits will be all zero.
When MX2A.0=0 (VRA is disable), this register will return BB80h when read.
When MX2A.0=0 (VRA is disable), this register will return BB80h when read.
DRA can be written when (ID=00)&(DSA=00), otherwise it is always 0.
The ALC250 supports the following sampling rates, as required in the PC99/PC2001 design guide.
The ALC250 supports the following sampling rates, as required in the PC99/PC2001 design guide.
Type
Type
R/W
R/W
Output Sampling Rate FOSR[15:0]
Output Sampling Rate FISR[15:0]
Sampling rate
Sampling rate
11025
12000
16000
22050
24000
32000
44100
48000
11025
12000
16000
22050
24000
32000
44100
48000
8000
8000
16
Function
Function
FOSR[15:0]
FISR[15:0]
AC44h
BB80h
AC44h
BB80h
7D00h
7D00h
2B11h
3E80h
2B11h
3E80h
1F40h
5622h
1F40h
5622h
5DC0
5DC0
2EE0
2EE0
ALC250 DataSheet
Rev1.3