ALC892 데이터 시트보기 (PDF) - Realtek Semiconductor
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ALC892 Datasheet PDF : 90 Pages
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ALC892
Datasheet
7.1.1.
Item
BCLK
SYNC
SDO
SDI
RST#
Link Signal Definitions
Table 2. Link Signal Definitions
Description
24.0MHz bit clock sourced from the HDA controller and connecting to all codecs
48kHz signal used to synchronize input and output streams on the link. It is sourced from the HDA
controller and connects to all codecs
Serial data output signal driven by the HDA controller to all codecs. Commands and data streams are carried
on SDO. The data rate is double pumped; the controller drives data onto the SDO, the codec samples data
present on SDO with respect to each edge of BCLK. The HDA controller must support at least one SDO. To
extend outbound bandwidth, multiple SDOs may be supported
Serial data input signal driven by the codec. This is point-to-point serial data from the codec to the HDA
controller. The controller must support at least one SDI, and up to a maximum of 15 SDI’s can be supported.
SDI is driven by the codec at each rising edge of BCLK, and sampled by the controller at each rising edge of
BCLK. SDI can be driven by the controller to initialize the codec’s ID
Active low reset signal. Asserted to reset the codec to default power on state. RST# is sourced from the HDA
controller and connects to all codecs
Signal Name
BCLK
SYNC
SDO
SDI
RST#
Source
Controller
Controller
Controller
Codec/Controller
Controller
Table 3. HDA Signal Definitions
Type for Controller Description
Output
Global 24.0MHz Bit Clock
Output
Global 48kHz Frame Sync and Outbound Tag Signal
Output
Serial Data Output from the Controller
Input/Output Serial Data Input from Codec.
Weakly pulled down by the controller
Output
Global Active Low Reset Signal
BCLK
SYNC
SDO
SDI
8-Bit Frame SYNC
Start of Frame
7 6 5 4 3 2 1 0 999 998 997 996 995 994 993 992 991 990
3
2
10
499 498 497 496 495 494
Codec samples SDO at both rising and falling edge of BCLK
Controller samples SDI at rising edge of BCLK
Figure 5. Bit Timing
7.1+2 Channel HD Audio Codec with Content Protection 11
Track ID: JATR-2265-11 Rev. 1.3
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