Cirrus Logic CS4205 - Manual (Page 16)

CS4205
16 DS489PP4
3. DIGITAL SIGNAL PATHS
The CS4205 includes a number of internal digital
signal path options. Figure 9 shows the principal
signal flow options through one channel of the de-
vice. Four commonly used signal flow modes are
detailed in the following sections. The signal flow
modes are controlled through the bits in the AC
Mode Control Register (Index 5Eh). The bit config-
uration for each detailed mode is listed in Table 1
on page 17.
3.1 Analog Centric Mode
Analog centric mode is detailed in Figure 10 on
page 18. In this mode, all the digital sources are
pre-mixed in the digital mixer and sent to the
DACs. The DAC outputs are mixed with the analog
sources in the analog mixer. The ADCs send cap-
tured data directly to the host. The ADC mux is
used to select a single source or the output of the in-
put mixer for capture. In the analog centric mode,
effects processing is only available on digital
sources.
Signal Processing Engine
SRC
DAC LINE_OUT
MONO_OUT
Σ
ADC ½ ADC
SRC
½ SRC
I²S
IN1
I²S
IN2
I²S
IN3
ZV ASRC VOL
VOL
VOL
VOL
Σ
DIG
EFX
I²S
OUT1
S/PDIF
OUT
I²S
OUT2
VOL
VOL VOL
VOL
DACS
CAPS
MICS
DDM
SDOS
SPDS
AC-Link
front
ch
L/R
cap
mic
cap
surr
ch
c+lfe
ch
MIXER
LINE
CD
VIDEO
AUX MIC
mux out mix out mic out
Figure 9. Digital Signal Path Overview