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ALC892

7.1+2 CHANNEL HD AUDIO CODEC WITH CONTENT PROTECTION

Realtek Semiconductor 

ALC892

Datasheet

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.

Previous Frame

A 48kHz Frame is composed of Command stream and multiple Data streams

Next Frame

SYNC

Frame SYNC

Stream 'A' Tag

(Here 'A' = 5)

Stream 'X' Tag

(Here 'X' = 6)

SDO

Command Stream Stream 'A' Data

Stream 'X' Data

0s

Sample Block(s)

Block 1 Block 2

..

.

Sample 1 Sample 2

..

.

One or multiple blocks in a stream

Null Field

Padded at the

end of Frame

For 48kHz rate, only Block1 is included

Block Y For 96kHz rate, Block1 includes (N)th time of samples, Block2

includes (N+1)th time of samples

Sample Z Z channels of PCM Sample

msb ... lsb msb first in a sample

Figure 7. SDO Outbound Frame

BCLK

SYNC

Stream Tag

msb lsb

1010

Preamble Stream=10 Data of Stream 10

(4-Bit) (4-Bit)

SDO

76543210

Previous Stream

Figure 8. SDO Stream Tag is Indicated in SYNC

7.1+2 Channel HD Audio Codec with Content Protection 13

Track ID: JATR-2265-11 Rev. 1.3

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