ALC892 datasheet(21/90 Pages) REALTEK

21 / 90 page

ALC892

Datasheet

7.1+2 Channel HD Audio Codec with Content Protection

Track ID: JATR-2265-11

Rev. 1.3

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

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

Preamble Stream=10

11 0

msb

lsb

Previous Stream

Stream Tag

(4-Bit)

Figure 8.

SDO Stream Tag is Indicated in SYNC

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