CS4294SLASHCS4298 datasheet(54/81 Pages) CIRRUS

54 / 81 page

CS4205

DS489PP4

6. SERIAL DATA PORTS

6.1

Overview

The CS4205 implements two serial data output

ports and three serial data input ports that can be

used for digital docking or multi-channel expan-

sion. 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, SDO2 for the second output port, and

SDI[3:1] for the three input ports. Serial data is re-

ceived and transmitted on these ports every

AC-link frame.

The serial data port is controlled by the SDEN,

SDSC, SDI[3:1], and SDO2 bits in the Serial Port

Control Register (Index 6Ah). All the serial data

port pins are multiplexed with other functions and

cannot be used unless the other function is disabled

or powered down; see Section 9, Exclusive Func-

tions. Some audio DACs can run in an internal

SCLK mode where SCLK is internally derived

from MCLK and LRCLK. In this case, SCLK gen-

eration in the CS4205 is optional.

A feature has been designed into the CS4205 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). This

feature guarantees that all DACs in a system have

the same phase response, maintaining the accuracy

of spatial cues.

In the CS4205, the volume of the serial port data is

controlled with the Serial Data Port Volume Con-

trol Registers (Index 6Eh, Address 06h - 07h).

However, there is no SRC available on this data, so

it is the responsibility of the controller or host soft-

ware to provide this functionality if desired.

6.2

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 14 on page 43 for the actual slots

used depending on configuration. Figure 15 shows

a six channel application using the CS4205.

AOUTL

AOUTR

SDATA

DEM#/SCLK

LRCK

MCLK

GPIO1/SDOUT

SPDO/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 15. Serial Data Port: Six Channel Circuit

CS4294/CS4298 数据表(PDF) 54 Page - Cirrus Logic

CS4294/CS4298 数据表(HTML) 54 Page - Cirrus Logic

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81

数据表下载

链接网址

CS4294/CS4298 数据表(PDF) 54 Page - Cirrus Logic

CS4294/CS4298 数据表(HTML) 54 Page - Cirrus Logic

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81

数据表 下载

链接网址

数据表下载