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ALC892

7.1+2 CHANNEL HD AUDIO CODEC WITH CONTENT PROTECTION

Realtek Semiconductor 

ALC892

Datasheet

7.2.3. Inbound Frame – Single SDI

An Inbound Frame – A single SDI is composed of one 36-bit response stream and multiple data streams.

Except for the initialization sequence (turnaround and address frame), the SDI is driven by the codec at

each rising edge of BCLK. The controller also samples data at the rising edge of BCLK.

The SDI stream tag is not carried by SYNC, but included in the SDI. A complete SDI data stream

includes one 4-bit stream tag, one 6-bit data length, and n-bit sample blocks. Zeros will be padded if the

total length of the contiguous sample blocks within a given stream is not of integral byte length (Figure

11).

Previous Frame

A 48kHz Frame is Composed of a Response Stream and Multiple Data streams

Next Frame

SYNC

Frame SYNC

SDI

Response Stream

Stream 'A'

Stream 'X'

0s

Stream Tag

Sample Block(s)

Null Field Padded at the end of Frame

Block 1 Block 2

For 48kHz rate, only Block1 is included

...

Block Y Null Pad For 96kHz rate, Block{1, 2} includes {(N)th (N+1)th} time of samples

Sample 1 Sample 2 ...

Sample Z Z channels of PCM Sample

msb ...

lsb msb first in a sample

Figure 10. SDI Inbound Stream

BCLK

SDI

Stream Tag

Data Length in Bytes n-Bit Sample Block

Null Pad

Next Stream

B9 B8 B7 B6 B5 B4 B3 B2 B1 B0 Dn-1 Dn-2

D0 0 0 0 0

(Data Length in Bytes *8)-Bit

A Complete Stream

Figure 11. SDI Stream Tag and Data

7.1+2 Channel HD Audio Codec with Content Protection 15

Track ID: JATR-2265-11 Rev. 1.3

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