BU94603KV Functional Specifications
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Target Spec 0.12
V.13 SPDIF format
Digital audio interface
Signal name I/O
Function
Remarks
SPDIF
O Digital audio output
-
SPDIF output becomes enabled by setting SEL_DOUT terminal to L and setting this condition using the
I2C command. *See Chapter V.4.
Figure V.13 shows the digital audio signal output format.
Figure V.13 SPDIF Output Format
A sub-frame of SPDIF is composed of synchronous preamble, 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.
SPDIF outputs synchronous preamble (source code 0-3) as it is and others (source code 4-31) as
bi-phase output. It outputs L while the operation is stopped.
Synchronous preamble and C bit use 32 frames (
≈4.4ms) as one cycle. Table V.13.1 and Table V.13.2
show these formats. V bit is fixed to L. U bit uses 98 frames (
≈13.3ms) as one cycle.
Table V.13.1 Synchronous Preamble Pattern
L0
R0
L1
R1
L2
R2
L3
R3
L4
R4
L5
R5
0
B
W
M
W
M
W
M
W
M
W
M
W
1
M
W
M
W
M
W
M
W
M
W
M
W
:
:
:
:
:
:
:
:
:
:
:
:
:
31
M
W
M
W
M
W
M
W
M
W
M
W
Table V.13.2 C Bit Format
L0
R0
L1
R1
L2
R2
L3
R3
L4
R4
L5
R5
0
0
0
0
0
0
0
1
0
0
1
0
0
0
2
0
0
0
0
0
0
3
0
0
1
0
0
1
0
0
4
0
0
0
0
0
0
5
0
0
0
0
0
0
:
:
:
:
:
:
:
31
0
0
0
0
0
0
Synchronous
preamble
all 0
Audio data(16bit)
LSB
MSB
V
U
C
P
0
3 4
1112
27 28 29 30 31
Source code
Synchronous
preamble
(B pattern)
(M pattern)
(W pattern)
Source code(4-31)
0
0
0
0
0
0
0
0
1
0
1
1
0
1
SPDIF output
Synchronous
preamble
