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ALC888S-VD Datasheet(PDF) 22 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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 22 page
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ALC888S-VD
Datasheet
7.1+2 Channel HD Audio Codec with Two Independent
SPDIF Outputs
14
Track ID: JATR-2265-11
Rev. 1.2
7.2. Frame Composition
7.2.1.
Outbound Frame – Single SDO
An outbound frame is composed of one 32-bit command stream and multiple data streams. There are one
or multiple sample blocks in a data stream. Only one sample block exists in a stream if the HDA
controller delivers a 48kHz rate of samples to the codec. Multiple sample blocks in a stream means the
sample rate is a multiple of 48kHz. This means there should be two blocks in the same stream to carry
96kHz samples (Figure 7).
For outbound frames, the stream tag is not in SDO, but in the SYNC signal. A new data stream is started
at the end of the stream tag. The stream tag includes a 4-bit preamble and 4-bit stream ID (Figure 8).
To keep the cadence of converters bound to the same stream, samples for these converters must be placed
in the same block.
Command Stream
SDO
SYNC
A 48kHz Frame is composed of Command stream and multiple Data streams
Stream 'X' Data
Stream 'A' Data
Stream 'A' Tag
Stream 'X' Tag
Frame SYNC
(Here 'A' = 5)
(Here 'X' = 6)
Next Frame
Previous Frame
0s
Null Field
Sample Block(s)
Block 1
Block 2
..
.
Block Y
Sample 1 Sample 2
..
.
Sample Z
msb
...
lsb
For 48kHz rate, only Block1 is included
One or multiple blocks in a stream
For 96kHz rate, Block1 includes (N)
th time of samples, Block2
includes (N+1)
th time of samples
Z channels of PCM Sample
msb first in a sample
Padded at the
end of Frame
Figure 7.
SDO Outbound Frame
SDO
SYNC
BCLK
Data of Stream 10
7654
0
1
2
3
Preamble Stream=10
11 0
0
msb
lsb
Previous Stream
Stream Tag
(4-Bit)
(4-Bit)
Figure 8.
SDO Stream Tag is Indicated in SYNC




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