alc250-lf Realtek Semiconductor Corporation, alc250-lf Datasheet - Page 22

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

6.1.23 MX3A S/PDIF Out Channel Status/Control
Default: 2000h
Two-Channel AC’97 2.3 Audio Codec
13:12
10:4
Bit
15
14
11
3
2
1
0
The consumer channel status block (bit0~bit31):
The ‘V’ bit in the sub-frame is determined by Validity control (MX3A.15) and VCFG (MX2A.15):
Type
PRO=0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Validity
CC0
R
R
Fs0
16
24
8
0
1
0
0
0
1
Validity Control (control V bit in Sub-Frame)
DRS (Double Rate S/PDIF)
This bit only can be set when SPSR is 10b.
S/PDIF Sample Rate SPSR[1:0]
Generation Level (LEVEL)
Category Code (CC[6:0])
Preemphasis (PRE)
Copyright (COPY)
Non-Audio Data type (/AUDIO)
Professional or Consumer format (PRO)
The ALC250 supports consumer channel status format, so this bit is always 0.
0: The V bit (valid flag) in sub-frame depends on whether the S/PDIF data is under-run or over-run.
1: The V bit in sub-frame is always send as 1 to indicate the invalid data is not
00: Sample rate set to 44.1KHz, Fs[0:3]=0000
01: Reserved
10: Sample rate set to 48.0KHz, Fs[0:3]=0100 (default)
11: Sample rate set to 32.0KHz, Fs[0:3]=1100
0: None
0: Not asserted
0: PCM data
0: Consumer format
0: 32K, 44.1K, 48K S/PDIF-Out
1: 96K S/PDIF-Out
/AUDIO
suitable for receiver.
CC1
Fs1
17
25
VCFG
1
9
0
1
0
1
0
COPY
If S/PDIF FIFO is under-run, the ‘V’ bit in the sub-frame is set to
If S/PDIF FIFO is under-run, the ‘V’bit in the sub-frame is always 0,
The ‘V’ bit is always 1, and data bits (bit 8 ~ bit 27) should be
The ‘V’ bit in sub-frame is always “
CC2
indicate that the S/PDIF data is invalid.
and pads the data with “0”s.
forced to 0.
‘0’, and the S/PDIF output data should be forced to zero.
Fs2
10
18
26
2
0
1: Filter preemphasis is 50/15 usec
1: AC3 or other digital non-audio data
1: Asserted
1: Professional format
PRE
CC3
Fs3
11
19
27
3
0
CC4
12
20
28
4
0
0
0
17
Operation
Function
CC5
13
21
29
5
0
0
0
CC6
14
22
30
6
0
0
0
LEVEL
15
23
31
7
0
0
0
ALC250 DataSheet
Rev1.3