alc269qsrs-gr Realtek Semiconductor Corporation, alc269qsrs-gr Datasheet - Page 21

• Manufacturer Part Number: alc269qsrs-gr
• Description: High Definition Audio Codec With Embedded Class D Speaker Amplifier
• Manufacturer: Realtek Semiconductor Corporation

7.2.
7.2.1.
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 2 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.
High Definition Audio Codec with Embedded
Class D Speaker Amplifier
SYNC
Previous Frame
SDO
Frame Composition
Frame SYNC
Sample 1 Sample 2
Block 1
Outbound Frame – Single SDO
Command Stream
Sample Block(s)
msb
A 48kHz Frame is composed of Command stream and multiple Data streams
Block 2
...
lsb
..
..
.
.
msb first in a sample
Stream 'A' Data
Figure 7.
Stream 'A' Tag
(Here 'A' = 5)
One or multiple blocks in a stream
Sample Z
Block Y
For 48kHz rate, only Block1 is included
For 96kHz rate, Block1 includes (N)
includes (N+1)
Z channels of PCM Sample
SDO Outbound Frame
13
th
time of samples
Stream 'X' Tag
(Here 'X' = 6)
Stream 'X' Data
Track ID: JATR-1076-21
Null Field
th
time of samples, Block2
0s
Padded at the
end of Frame
Next Frame
Datasheet
ALC269
Rev. 1.1