CS4630-CM Просмотр технического описания (PDF) - Cirrus Logic
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CS4630-CM Datasheet PDF : 38 Pages
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CS4630
5. SERIAL PORT CONFIGURATIONS
A flexible serial audio interface is provided which
allows connection to external Analog-to-Digital
Converters (ADCs), Digital-to-Analog Converters
(DACs) or Codecs (combined ADC and DAC
functions) in several different configurations. The
serial audio interface includes a primary input/out-
put port with dedicated serial data pins (SDIN, SD-
OUT), two auxiliary audio output ports (SDO2,
SDO3) which share pins with the joystick interface
button input functions, and one auxiliary audio in-
put port (SDIN2). Each of these digital audio input
and output pins carry two channels of audio data.
These two channels may comprise the left and right
channels of a stereo audio signal, or two indepen-
dent monaural audio signals.
Each digital audio channel is internally buffered
through a 16 sample x 20-bit FIFO. The data format
for the serial digital audio ports varies depending
on the configuration. The primary configuration in-
cludes a CS4630 plus a CS4297/97A/98/99.
The CS4630 communicates with the
CS4297/97A/98/99 over the AC-link as specified
in the Intel‚ Audio Codec ‘97 Specification (revi-
sion 2.1). A block diagram for the AC ’97 Control-
ler configuration is given in Figure 11. In this
configuration, the AC ’97 Codec is the timing mas-
ter for the digital audio link. The ASDOUT output
supports data transmission on all ten possible sam-
ple slots (output slots 3 - 12). The ASDIN input
supports receiving of audio sample data on all input
sample slots (input slots 3 - 12). The SDO2 and
SDO3 serial outputs and the SDIN2 serial input are
not supported in this configuration. In the dual AC
‘97 system, the primary AC ‘97 codec is connected
as in the single codec case; however, a second
CS4297A/98/99 is connected to a completely sepa-
rate serial data in pin ASDIN2. A block diagram
ABITCLK
ASYNC
ASDOUT
ASDIN
ARST#
CS4630
MIDIIN
MIDIOUT
JACX, JACY, JBCX, JBCY
JAB1, JAB2, JBB1, JBB2
12.288 MHz
48 kHz
24.576 MHz
BIT_CLK
SYNC
SDATA_OUT
SDATA_IN
RESET#
CS4297A
Joystick/
MIDI Port
Figure 11. AC ‘97 Codec Connection Diagram
20
DS445PP1
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