CS4294SLASHCS4298 datasheet(55/81 Pages) CIRRUS

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CS4205

DS489PP4

6.3

Digital Docking

The CS4205 features three serial data input ports

used to receive data from three stereo ADCs inside

a docking station. One serial data output port is

used to transmit data to a stereo DAC inside the

docking station. To fully utilize digital docking, the

CS4205 should be configured for digital centric

mode; see Section 3.2, Digital Centric Mode. This

will allow the docking sources to be mixed with the

analog sources from the notebook. The resulting

mix is available for listening on both the notebook

and the docking station and for capturing on the

host. Figure 16 shows a block diagram for digital

docking applications of the CS4205.

Note the BIT_CLK output should be buffered be-

fore sending it as MCLK to the docking station

converters. The capacitance loading of the docking

station connector, the relatively long trace, and the

multiple loads on this signal may exceed the load-

ing restrictions on BIT_CLK. Buffering of SCLK

and LRCLK should also be considered.

6.4

Serial Data Formats

In order to support a wide variety of serial audio

DACs and ADCs, the CS4205 can transmit and re-

ceive serial data in four different formats. The de-

sired format is selected through the SDF[1:0] bits in

the Serial Port Control Register (Index 6Ah). All se-

rial ports use the same serial data format when en-

abled. In all cases, LRCLK will be synchronous

with Fs, and SCLK will be 64 Fs (BIT_CLK/4). Se-

rial data is transitioned by the CS4205 on the falling

edge of SCLK and latched by the DACs on the next

rising edge. Serial data is shifted out MSB first in all

supported formats, but LRCLK polarity as well as

data justification, alignment, and resolution vary.

Table 23 shows the principal characteristics of each

serial format.

Stereo DAC

Stereo ADC

SCLK

CS4205

Line Out L

Line Out R

Mic In L

Mic In R

LRCLK

SDOUT

SDI1

SDI2

SDI3

Stereo ADC

Line In L

Line In R

Stereo ADC

CD In L

CD In R

MCLK

DC '97

Controller

Notebook Side

Docking Station Side

Figure 16. Digital Docking Connection Diagram

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