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ALC888S-VD Datasheet(PDF) 24 Page - Realtek Semiconductor Corp.

Part No. ALC888S-VD
Description  7.12 CHANNEL HD AUDIO CODEC WITH TWO INDEPENDENT SPDIF OUTPUTS
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Maker  REALTEK [Realtek Semiconductor Corp.]
Homepage  https://www.realtek.com/en/
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 24 page
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ALC888S-VD
Datasheet
7.1+2 Channel HD Audio Codec with Two Independent
SPDIF Outputs
16
Track ID: JATR-2265-11
Rev. 1.2
7.2.3.
Inbound Frame – Single SDI
An Inbound Frame – A single SDI is composed of one 36-bit response stream and multiple data streams.
Except for the initialization sequence (turnaround and address frame), the SDI is driven by the codec at
each rising edge of BCLK. The controller also samples data at the rising edge of BCLK.
The SDI stream tag is not carried by SYNC, but included in the SDI. A complete SDI data stream
includes one 4-bit stream tag, one 6-bit data length, and n-bit sample blocks. Zeros will be padded if the
total length of the contiguous sample blocks within a given stream is not of integral byte length (Figure
11).
Response Stream
SDI
SYNC
A 48kHz Frame is Composed of a Response Stream and Multiple Data streams
Stream 'X'
Stream 'A'
Frame SYNC
Next Frame
Previous Frame
0s
Null Field
Sample 1 Sample 2
...
Sample Z
msb
...
lsb
For 48kHz rate, only Block1 is included
For 96kHz rate, Block{1, 2} includes {(N)
th (N+1)th} time of samples
Z channels of PCM Sample
msb first in a sample
Padded at the end of Frame
Sample Block(s)
Stream Tag
Block 1
Block 2
...
Block Y Null Pad
Figure 10. SDI Inbound Stream
BCLK
SDI
Data Length in Bytes
D
n-1
00
00
Stream Tag
B0
D
n-2
B
1
B
2
B
3
B
4
B
5
B6
B7
B
8
B
9
D0
(Data Length in Bytes *8)-Bit
Next Stream
Null Pad
n-Bit Sample Block
A Complete Stream
Figure 11. SDI Stream Tag and Data




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