CS4294SLASHCS4298 datasheet(42/66 Pages) CIRRUS

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CS4202

DS549PP2

5. SERIAL DATA PORTS

5.1

Overview

The CS4202 implements two serial data output

ports that can be used for multi-channel expansion.

Each serial port consists of 4 signals: MCLK,

SCLK, LRCLK, and SDATA. The existing 256 Fs

BIT_CLK will be used as MCLK. The clock pins

are shared between all the serial ports with only the

SDATA pins being separate; SDOUT for the first

output port, and SDO2 for the second output port.

Serial data is transmitted on these ports every

AC-link frame.

The serial data port is controlled by the SDEN,

SDSC, and SDO2 bits in the Serial Port Control

are multiplexed with other functions and cannot be

used unless the other function is disabled or pow-

ered down; see Section 7, Exclusive Functions.

Some audio DACs can run in an internal SCLK

mode where SCLK is internally derived from

MCLK and LRCLK. In this case, SCLK generation

in the CS4202 is optional.

A feature has been designed into the CS4202 that

allows the phase of the internal DACs to be re-

versed. This DAC phase reversal is controlled by

the DPC bit in the Misc. Crystal Control Register

(Index 60h). This feature is necessary since the

phase response for external DACs is unknown and

the phase response of the internal DACs can vary

depending on the path determined by the DDM bit

in the AC Mode Control Register (Index 5Eh) and

the output (LINE_OUT or HP_OUT) being used.

This feature guarantees that all DACs in a system

have the same phase response, maintaining the ac-

curacy of spatial cues.

Please note the data sent to the serial ports is

straight from the AC-link. There is no SRC and no

volume control available on this data, so it is the re-

sponsibility of the controller or host software to

provide this functionality if desired.

5.2

Multi-Channel Expansion

For multi-channel expansion, the two serial data

output ports are used to send AC-link data to one or

two external stereo DACs to support up to a total of

six channels. The first serial port takes the digital

audio data from the SDOUT slots. The second seri-

al port takes the digital audio data from the SDO2

slots. See Table 8 on page 30 for the actual slots

used depending on configuration. Figure 10 shows

a six channel application using the CS4202.

AOUTL

AOUTR

SDATA

DEM#/SCLK

LRCK

MCLK

GPIO1/SDOUT

GPIO4/SDO2

EAPD/SCLK

GPIO0/LRCLK

LINE_OUT_L

LINE_OUT_R

BIT_CLK

CS4334

AOUTL

AOUTR

SDATA

DEM#/SCLK

LRCK

MCLK

CS4334

270K

10uF

ELEC

10uF

ELEC

47K

560

2700pF 2700pF

Left Surround

Right Surround

270K

10uF

ELEC

10uF

ELEC

47K

560

2700pF 2700pF

Center

LFE

AGND

Left Front

Right Front

AGND

10uF

ELEC

10uF

ELEC

1000pF

AGND

220K

AGND

1000pF

Figure 10. Serial Data Port: Six Channel Circuit

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