alc888s Realtek Semiconductor Corporation, alc888s Datasheet - Page 21

• Manufacturer Part Number: alc888s
• Description: 7.1+2 Channel High Definition Audio Codec With Two Independent S/pdif-out
• Manufacturer: Realtek Semiconductor Corporation

7.1.2.
The HDA controller supports two SDOs for the outbound stream, up to 15 SDIs for the inbound stream.
RST#, BCLK, SYNC, SDO0, and SDO1 are driven by the controller to codecs. Each codec drives its own
point-to-point SDI signal(s) to the controller.
Figure 7 shows the possible connections between the HDA controller and codecs:
• Codec 0 is a basic connection. There is one single SDO and one single SDI for normal transmission
• Codec 1 has two SDOs for doubled outbound rate, a single SDI for normal inbound rate
• Codec 3 supports a single SDO for normal outbound rate, and two SDIs for doubled inbound rate
• Codec N has two SDOs and multiple SDIs
The multiple SDOs and multiple SDIs are used to expand the transmission rate between the controller and
codecs. Section 7.2 Frame Composition, page 14 describes the detailed outbound and inbound stream
compositions for single and multiple SDOs/SDIs.
The connections shown in Figure 7 can be implemented concurrently in an HDA system. The
ALC888S(DD) is designed to receive a single SDO stream.
7.1+2 Channel High Definition Audio Codec
w/Two Independent S/PDIF-OUT
Controller
HDA
SDI14
SDI13
SDO1
SDO0
SYNC
BCLK
RST#
SDI2
SDI1
SDI0
.
.
.
Signaling Topology
Single SDO
Single SDI
Codec 0
Figure 7.
Two SDOs
Single SDI
Codec 1
Signaling Topology
13
.
.
.
Single SDO
Two SDIs
Codec 2
ALC888S & ALC888SDD
Track ID: JATR-1076-21
. . .
Multiple SDIs
Codec N
Two SDOs
Datasheet
Rev. 1.2