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CS5535-UDC Datasheet(PDF) 81 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # CS5535-UDC
Description  Geode??CS5535 I/O Companion Multi-Function South Bridge
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

CS5535-UDC Datasheet(HTML) 81 Page - National Semiconductor (TI)

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Revision 0.8
4.3
AC97 AUDIO CODEC CONTROLLER
The primary purpose of the AC97 Audio Codec Controller
(ACC) is to stream data between system memory and an
AC97 codec (or codecs) using direct memory access
(DMA). The AC97 codec supports several channels of digi-
tal audio input and output. Hence, the ACC contains sev-
eral bus mastering DMA engines to support these
channels. This method off-loads the CPU, improving sys-
tem performance. The ACC is connected to the system
through the GLIU and all accesses to and from system
memory go through the GLIU. The AC97 codec is con-
nected with a serial interface, and all communication with
the codec occurs via that interface (see Figure 4-3).
Features include:
• AC97 version 2.1 compliant interface to codecs: serial in
(x2), serial out, sync out, and bit clock in.
• Eight-channel buffered GLIU mastering interface.
• Support for industry standard 16-bit pulse code modu-
lated (PCM) audio format.
• Support for any AC97 codec with Sample Rate Conver-
sion (SRC).
• Transport for audio data to and from the system memory
and AC97 codec.
• Capable of outputting multi-channel 5.1 surround sound
(Left, Center, Right, Left Rear, Right Rear, and
Low Frequency Effects).
Hardware Includes:
• GeodeLink Adapter.
• Three 32-bit stereo-buffered bus masters (two for output,
one for input).
• Five 16-bit mono-buffered bus masters (three for output,
two for input).
• AC Link Control block for interfacing with external AC97
codec(s).
The ACC logic controls the traffic to and from the AC97
codec. For input channels, serial data from the codec is
buffered and written to system memory using DMA. For
output channels, software-processed data is read from sys-
tem memory and streamed out serially to the codec.
Figure 4-3. ACC Block Diagram
GLIU Data In
GLIU Data Out
GeodeLink Adaptor (GLA)
Output
Data
Mux
Registers / Control
To/From Codec
Control Signals to Bus Masters
GLCP I/F
Bus Master 0
Bus Master 1
Bus Master 2
Bus Master 3
Bus Master 4
Bus Master 5
Bus Master 6
Bus Master 7
CCU
GL Clock
CCU
LBus Clock
CCU
AC Link
Bit Clock
AC
Link


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