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ALC892

7.1+2 CHANNEL HD AUDIO CODEC WITH CONTENT PROTECTION

Realtek Semiconductor 

ALC892

Datasheet

7.3.3. Codec Initialization Sequence

n The codec drives SDI high at the last bit of SYNC to request a Codec Address (CAD) from the

controller

o The codec will stop driving the SDI during this turnaround period

pqrs The controller drives SDI to assign a CAD to the codec

t The controller releases the SDI after the CAD has been assigned

u Normal operation state

Exit from Reset Connection Frame

Turnaround Frame

(Non-48kHz Frame)

Address Frame

(Non-48kHz Frame)

Normal Operation

BCLK

SYNC

SDIx

RST#

Frame SYNC

Frame SYNC

Frame SYNC

1

2

3

45

SD0 SD1

6

SD14

7

8

Response

Codec

Drives SDIx

Codec

Turnaround

( 477 BCLK

Max.)

Figure 14.

Controller Drives SDIx

Controller

Turnaround

( 477 BCLK

Max.)

Codec Initialization Sequence

Codec Drives SDIx

7.4. Verb and Response Format

7.4.1. Command Verb Format

There are two types of verbs: one with 4-bit identifiers (4-bit verbs) and 16-bits of data, the other with

12-bit identifiers (12-bit verbs) and 8-bits of data. Table 7 shows the 4-bit verb structure of a command

stream sent from the controller to operate the codec. Table 8 is the 12-bit verb structure that gets and

controls parameters in the codec.

Bit [39:32]

Reserved

Table 7. 40-Bit Commands in 4-Bit Verb Format

Bit [31:28]

Bit [27:20]

Bit [19:16]

Codec Address

Node ID

Verb ID

Bit [15:0]

Payload

Bit [39:32]

Reserved

Table 8. 40-Bit Commands in 12-Bit Verb Format

Bit [31:28]

Bit [27:20]

Bit [19:8]

Codec Address

Node ID

Verb ID

Bit [7:0]

Payload

7.1+2 Channel HD Audio Codec with Content Protection 21

Track ID: JATR-2265-11 Rev. 1.3

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