AK4122 Datasheet, PDF (34/53 Pages) List of Unclassifed Manufacturers – 24 BIT 96KHZ SRC WITH DIR

ASAHI KASEI
[AK4122]
„ Q-subcode buffers
The DIR of the AK4122 has a Q-subcode buffer for CD application. The AK4122 takes Q-subcode into registers under
the following conditions:
1) The sync word (S0, S1) consists of at least 16 “0”s.
2) The start bit is “1”.
3) Those 7-bits Q-W follows to the start bit.
4) The distance between two start bits is 8-16 bits.
The QINT bit in the control register goes “1” when the new Q-subcode differs from old one, and goes “0” when QINT bit
is read.
12345678 *
S0 0 0 0 0 0 0 0 0 0…
S1 0 0 0 0 0 0 0 0 0…
S2 1 Q2 R2 S2 T2 U2 V2 W2 0…
S3 1 Q3 R3 S3 T3 U3 V3 W3 0…
:
:
:
:
:
:
:
:
:
:
S97 1 Q97 R97 S97 T97 U97 V97 W97 0…
S0 0 0 0 0 0 0 0 0 0…
S1 0 0 0 0 0 0 0 0 0…
S2 1 Q2 R2 S2 T2 U2 V2 W2 0…
S3 1 Q3 R3 S3 T3 U3 V3 W3 0…
:
:
:
:
:
:
:
:
:
:
↑
(*) number of “0” : min=0; max=8.
Q
Figure 22. Configuration of U-bit(CD)
Q2 Q3 Q4 Q5 Q6 Q7 Q8 Q9 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 Q19 Q20 Q21 Q22 Q23 Q24 Q25
CTRL
ADRS
TRACK NUMBER
INDEX
Q26 Q27 Q28 Q29 Q30 Q31 Q32 Q33 Q34 Q35 Q36 Q37 Q38 Q39 Q40 Q41 Q42 Q43 Q44 Q45 Q46 Q47 Q48 Q49
MINUTE
SECOND
FRAME
Q50 Q51 Q52 Q53 Q54 Q55 Q56 Q57 Q58 Q59 Q60 Q61 Q62 Q63 Q64 Q65 Q66 Q67 Q68 Q69 Q70 Q71 Q72 Q73
ZERO
ABSOLUTE MINUTE
ABSOLUTE SECOND
Q74 Q75 Q76 Q77 Q78 Q79 Q80 Q81 Q82 Q83 Q84 Q85 Q86 Q87 Q88 Q89 Q90 Q91 Q92 Q93 Q94 Q95 Q96 Q97
ABSOLUTE FRAME
CRC
G(x)=x¹⁶+x¹²+x⁵+1
Figure 23. Q-subcode
Addr
Register Name
D7 D6 D5 D4 D3 D2 D1 D0
13H Q-subcode Address / Control Q9 Q8 · · · · · · · · · · · · Q3 Q2
14H
Q-subcode Track
Q17 Q16 · · · · · · · · · · · · Q11 Q10
15H
Q-subcode Index
··· ··· ··· ··· ··· ··· ··· ···
16H
Q-subcode Minute
··· ··· ··· ··· ··· ··· ··· ···
17H
Q-subcode Second
··· ··· ··· ··· ··· ··· ··· ···
18H
Q-subcode Frame
··· ··· ··· ··· ··· ··· ··· ···
19H
Q-subcode Zero
··· ··· ··· ··· ··· ··· ··· ···
1AH Q-subcode ABS Minute
··· ··· ··· ··· ··· ··· ··· ···
1BH Q-subcode ABS Second · · · · · · · · · · · · · · · · · · · · · · · ·
1CH Q-subcode ABS Frame Q81 Q80 · · · · · · · · · · · · Q75 Q74
Figure 24. Q-subcode register map
MS0267-E-02
- 34 -
2004/07