alc885-gr Realtek Semiconductor Corporation, alc885-gr Datasheet - Page 17

• Manufacturer Part Number: alc885-gr
• Description: 7.1+2 Channel High-performance Hda Codec With Content Protection
• Manufacturer: Realtek Semiconductor Corporation

7.
7.1. Link Signals
The High Definition Audio (HDA) link is the digital serial interface that connects the HDA codecs to the
HDA Controller. The HDA link protocol is controller synchronous, based on a 24.0MHz BIT-CLK sent
by the HDA controller. The input and output streams, including command and PCM data, are isochronous
with a 48kHz frame rate. Figure 4 shows the basic concept of the HDA link protocol.
7.1+2 Channel High-Performance HDA Codec
With Content Protection
Previous Frame
SYNC
BCLK
RST#
SDO
SDI
High Definition Audio Link Protocol
Frame SYNC= 8 BCLK
Command Stream
(40-bit data)
Response Stream
(36-bit data)
T
frame_sync
T
Stream 'A' Data
Stream 'A' Tag
frame_sync
(Here 'A' = 5)
Figure 4.
= 20.833 ? (48KHz)
=20.833 usec (48kHz)
Stream
'C' Tag
HDA Link Protocol
9
(n bytes + 10-bit data)
Stream 'C' Data
Stream 'B' Tag
Stream 'B' Data
(Here 'B' = 6)
ALC885 Series
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Datasheet
Rev. 1.1