ALC250 データシートの表示（PDF） - Unspecified
部品番号
コンポーネント説明
メーカー
ALC250 Datasheet PDF : 46 Pages
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Bit
15
14
13:12
11
10:4
3
2
1
0
ALC250 Data Sheet
Type
Function
R/W Validity Control (control V bit in Sub-Frame)
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
suitable for receiver.
R DRS (Double Rate S/PDIF)
0: 32K, 44.1K, 48K S/PDIF-Out
1: 96K S/PDIF-Out
This bit only can be set when SPSR is 10b.
R/W S/PDIF Sample Rate SPSR[1:0]
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
R/W Generation Level (LEVEL)
R/W Category Code (CC[6:0])
R/W Preemphasis (PRE)
0: None
1: Filter preemphasis is 50/15 usec
R/W Copyright (COPY)
0: Not asserted 1: Asserted
R/W Non-Audio Data type (/AUDIO)
0: PCM data 1: AC3 or other digital non-audio data
R Professional or Consumer format (PRO)
0: Consumer format 1: Professional format
The ALC250 supports consumer channel status format, so this bit is always 0.
The consumer channel status block (bit0~bit31):
0
1
2
3
4
5
6
7
PRO=0 /AUDIO COPY PRE
0
0
0
0
8
9
10
11
12
13
14
15
CC0
CC1
CC2
CC3
CC4
CC5
CC6 LEVEL
16
17
18
19
20
21
22
23
0
0
0
0
0
0
0
0
24
25
26
27
28
29
30
31
Fs0
Fs1
Fs2
Fs3
0
0
0
0
The “V” bit in the sub-frame is determined by Validity control (MX3A.15) and VCFG (MX2A.15):
Validity VCFG
Operation
0
0 If S/PDIF FIFO is under-run, the “V” bit in the sub-frame is set to
indicate that the S/PDIF data is invalid.
0
1 If S/PDIF FIFO is under-run, the “V” bit in the sub-frame is always
0, and pads the data with “0”s.
1
0 The “V” bit is always 1, and data bits (bit 8 ~ bit 27) should be
forced to 0.
1
1 The “V” bit in sub-frame is always “0”, and the S/PDIF output data
should be forced to zero.
Two Channel AC’97 2.3 Audio Codec
17
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