alc262w-vd2-gr Realtek Semiconductor Corporation, alc262w-vd2-gr Datasheet - Page 27

• Manufacturer Part Number: alc262w-vd2-gr
• Description: 4-channel Dac And 6-channel Adc High Definition Audio Codec
• 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 11).
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 12).
To keep the cadence of converters bound to the same stream, samples for these converters must be placed
in the same block.
4-Ch DAC and 6-Ch ADC High Definition Audio Code
SYNC
Previous Frame
SDO
Frame Composition
Frame SYNC
Sample 1
Block 1
Outbound Frame – Single SDO
Command Stream
Sample Block(s)
msb
A 48kHz Frame is composed of Command stream and multiple Data streams
BCLK
SYNC
SDO
Sample 2
Block 2
...
Figure 12. SDO Stream Tag is Indicated in SYNC
lsb
..
..
Previous Stream
.
.
msb first in a sample
Figure 11. SDO Outbound Frame
Stream 'A' Data
Stream 'A' Tag
(Here 'A' = 5)
Preamble Stream=10
One or multiple blocks in a stream
Sample Z
(4-Bit)
7 6 5 4
Block Y
Stream Tag
msb
1
3
For 48kHz rate, only Block1 is included
For 96kHz rate, Block1 includes (N)
includes (N+1)
Z channels of PCM Sample
(4-Bit)
0
2
lsb
1 0
1
18
0
Data of Stream 10
th
time of samples
Stream 'X' Tag
(Here 'X' = 6)
Stream 'X' Data
Null Field
Track ID: JATR-1076-21
th
time of samples, Block2
0s
Padded at the
ALC262 Series
end of Frame
Next Frame
Datasheet
Rev. 1.9