alc268 Realtek Semiconductor Corporation, alc268 Datasheet - Page 31

• Manufacturer Part Number: alc268
• Description: 2+2 Channel High Definition Audio Codec
• Manufacturer: Realtek Semiconductor Corporation

7.4. Verb and Response Format
7.4.1.
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 10 shows the 4-Bit verb structure of a command
stream sent from the controller to operate the codec. Table 11 is the 12-Bit verb structure that gets and
controls parameters in the codec.
7.4.2.
There are two types of response from the codec to the controller. Solicited Responses are returned by the
codec in response to a current command verb. The codec will send Solicited Response data in the next
frame, without regard to the Set (Write) or Get (Read) command. The 32-bit Response is interpreted by
software, opaque to the controller.
Unsolicited Responses are sent by the codec independently of software requests. Jack Detection or GPI
status information can be actively delivered to the controller and interpreted by software. The ‘Tag’ in
Bit[31:28] is used to identify unsolicited events. This tag is undefined in the HDA specifications.
Note: The response stream in the link protocol is 36-bits wide. The response is placed in the lower 32-bit
field. Bit-35 is a ‘Valid’ bit to indicate the response is ‘Ready’. Bit-34 is set to indicate that an unsolicited
response was sent.
2+2 Channel High Definition Audio Codec
Bit [39:32]
Bit [39:32]
Reserved
Reserved
Bit [35]
Valid
Bit [35]
Valid
Command Verb Format
Response Format
Codec Address
Codec Address
Bit [31:28]
Bit [31:28]
Table 11. 40-Bit Commands in 12-Bit Verb Format
Table 10. 40-Bit Commands in 4-Bit Verb Format
Unsol=1
Bit [34]
Table 13. Unsolicited Response Format
Table 12. Solicited Response Format
Unsol=0
Bit [34]
Bit [27:20]
Bit [27:20]
Bit [33:32]
Reserved
Node ID
Node ID
23
Bit [33:32]
Reserved
Bit [19:16]
Bit [31:28]
Bit [19:8]
Verb ID
Verb ID
Tag
Track ID: JATR-1076-21
ALC268 Series
Bit [31:0]
Response
Bit [15:0]
Bit [27:0]
Response
Bit [7:0]
Payload
Payload
Datasheet
Rev. 1.3