CS4294SLASHCS4298 datasheet(17/81 Pages) CIRRUS

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CS4205

DS489PP4

3.2

Digital Centric Mode

Digital centric mode is detailed in Figure 11. In this

mode, the analog sources are first mixed in the an-

alog mixer and sent to the ADCs. The ADC outputs

are then mixed with the digital sources in the digital

mixer. This allows effects processing on all sources

and supports a “what you hear is what you record”

model. The processed digital signal is sent to the

DACs, bypassing the analog mixer using DAC di-

rect mode. The ADC mux must be set to stereo mix

to support this model. Consequently, only the mix

can be captured by the host, rather than the individ-

ual sources.

3.3

Host Processing Mode

Host processing mode is detailed in Figure 12. This

mode is similar to digital centric mode, except the

output of the digital mixer is captured by the host.

Any mixing with host sources and effects process-

ing is done on the host. The processed signal is sent

to the DACs, bypassing the analog mixer using

DAC direct mode. In host processing mode, the

playback and capture paths are completely separate

inside the CS4205.

3.4

Multi-Channel Mode

Multi-channel mode is detailed in Figure 13. This

mode is an extension of any of the other three

modes, with the distinguishing feature that one or

two additional slot pairs are routed to the serial data

output

ports.

This

allows

for

complete

multi-channel solution with a single AC ’97 audio

codec and external DACs.

AC Mode

Control Bits

Analog Centric

Mode

Digital Centric

Mode

Host Processing

Mode

Multi-Channel

Mode

DACS

0 or 1

CAPS[1:0]

00,10 or 11

MICS

0 or 1

DDM

0 or 1

SDOS[1:0]

10 or 11

SPDS[1:0]

00, 01, 10 or 11

00 or 01

N/A

Table 1. AC Mode Control Configurations

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