BU94605AKV Datasheet, PDF (22/84 Pages) Rohm – AAC/WMA/MP3 +SD Memory Card +CD-ROM+MP3 Record

BU94605AKV BU94607AKV BU94702AKV BU94705AKV
7. SPDIF output
SPDIF interface
Signal Name
I/O
SPDIF
O
SPDIF output
Function
SPDIF output become enabled by setting it using the appropriate command.
The data of the sample rate 48 kHz and 32 kHz is converted into 44.1 kHz and output.
Remarks
Datasheet
7.1 Format
Figure 21. shows the SPDIF signal output format.
Source code
Synchronous
preamble
Source code(4-31)
SPDIF output
0
34
Synchronous
preamble
all 0
(B pattern)
11 12
LSB
Audio data(16bit)
(M pattern)
(W pattern)
00000000101101
Synchronous
preamble
27 28 29 30 31
MSB ^{V U C P}
Figure 21. SPDIF Output Format
One sub frame of SPDIF consists of synchronous preambles, 16-bit audio data, V bit (validity flag), U bit (user data), C
bit (channel status) and P bit (parity bit).
Output rate is fixed to 1X speed (44.1 kHz).
SPDIF outputs synchronous preambles (source code 0-3) as they are, and other elements (source code 4-31) as the
biphase output. While the operation stops, L output is enabled.
Synchronous preambles and C bit use 32 frames (≈4.4 ms) for one cycle. The data formats are shown in Table 4 and
Table 5 V bit is fixed to L. U bit uses 98 frames (≈13.3 ms) for one cycle.
Table 4. Synchronous Preamble Pattern
L0 R0 L1 R1 L2 R2 L3 R3 L4 R4 L5 R5
0B WMWMWMWMWMW
1M W M W M W M W M W M W
::
:
:
:
:
:
:
:
:
:
:
:
31 M W M W M W M W M W M W
L0 R0
0
0
1
0
2
0
3
0
4
0
5
0
:
:
31
0
L1 R1
0
0
0
0
0
0
:
0
Table 5. C Bit Format
L2 R2 L3 R3
Copy
0
1
0
0
Lbit
1
0
0
1
0
0
0
0
:
:
0
0
L4 R4
0
0
0
0
0
0
:
0
L5 R5
0
0
0
0
0
0
:
0
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2012.12.10 Rev.002