參數(shù)資料
型號(hào)： AD1892JRRL
廠商： ANALOG DEVICES INC
元件分類： 消費(fèi)家電
英文描述： Integrated Digital Receiver/Rate Converter
中文描述： SPECIALTY CONSUMER CIRCUIT, PDSO28
封裝： SOIC-28
文件頁(yè)數(shù)： 16/24頁(yè)
文件大小： 231K
代理商： AD1892JRRL
AD1892
–16–
REV. 0
The AD1892 includes an on-chip 10 byte Q-channel subcode
buffer that is defined in consumer mode only. MiniDisc and
Compact Disc systems use the Q-channel subcode information
to convey format, track, index and timing information. The Q-
channel is one of eight subcode channels defined (others being
P, R, S, T, U, V and W). The other subcode channels are not
supported by the AD1892. The subcode channels are formed
by accumulating user bits over a period of 1176 subframes. The
user bits from both the left channel subframe and the right
channel subframe are used to construct the subcode control
information. The user bits are accumulated into 98 12-bit
words, that form a matrix of sorts. The incoming user bits fill
this matrix row by row. The first two rows (S0 and S1) consist
of all zeros and form an easily identified subcode sync word.
The P-Channel subcode bit is always “1,” except during the
subcode sync word. The Q-channel is the first valid column of
user bits, designated Q2 through Q97 in Figure 25 below.
0
0
0
0
0
0
0
0
0
0
0
0
1
2
3
4
5
6
7
8
9
10
11
12
0
0
0
0
0
0
0
0
0
0
0
0
1
Q2
R2
S2
T2
U2
V2
W2
0
0
0
0
1
Q3
R3
S3
T3
U3
V3
W3
0
0
0
0
1
Q97
R97
S97
T97
U97
V97
W97
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
Q2
R2
S2
T2
U2
V2
W2
0
0
0
0
1
Q3
R3
S3
T3
U3
V3
W3
0
0
0
0
S0
S1
S2
S3
S97
S0
S1
S2
S3
SUBCODE SYNC WORD
SUBCODE SYNC WORD
98
12-BIT WORDS
= 1176 BITS
ONLY Q-CHANNEL IS USED FOR CD AND MD SUBCODE
Figure 25. Subcode User Bit Accumulation
The AD1892 stores only the Q2 through Q97 user bits that
comprise the Q-channel subcode information (96 bits); the
remaining 1080 bits (1176–96) are ignored. These 96 bits of Q-
channel subcode, organized in 12 bytes, are shown below in
Figure 26.
INDEX
DATA8
FRAME
DATA5
ABSOLUTE SECOND
DATA2
16-BIT CRC WORD
G(x) = x
16
+ x
12
+ x
5
+ 1
COMPUTED OVER Q2 TO Q81
TRACK NUMBER
DATA9
SECOND
DATA6
ABSOLUTE MINUTE
DATA3
DATA10
MINUTE
DATA7
ZERO
DATA4
ABSOLUTE FRAME
DATA1
ADRS
CTRL
Q2
Q3
Q4
Q5 Q6
Q7 Q8
Q9 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 Q19 Q20 Q21 Q22 Q23 Q24 Q25
Q26 Q27 Q28 Q29 Q30 Q31 Q32 Q33 Q34 Q35 Q36 Q37 Q38 Q39 Q40 Q41 Q42 Q43 Q44 Q45 Q46 Q47 Q48 Q49
Q50 Q51 Q52 Q53 Q54 Q55 Q56 Q57 Q58 Q59 Q60 Q61 Q62 Q63 Q64 Q65 Q66 Q67 Q68 Q69 Q70 Q71 Q72 Q73
Q74 Q75 Q76 Q77 Q78 Q79 Q80 Q81 Q82 Q83 Q84 Q85 Q86 Q87 Q88 Q89 Q90 Q91 Q92 Q93 Q94 Q95 Q96 Q97
Figure 26. Incoming Q-Channel Subcode
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