CS4294SLASHCS4298 datasheet(44/66 Pages) CIRRUS

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CS4202

DS549PP2

6. SONY/PHILIPS DIGITAL

INTERFACE (S/PDIF)

The S/PDIF digital output is used to interface the

CS4202 to consumer audio equipment external to

the PC. This output provides an interface for stor-

ing digital audio data or playing digital audio data

to digital speakers. Figure 15 illustrates the circuits

necessary for implementing the IEC-958 optical or

consumer interface. For further information on

S/PDIF operation see application note AN22: Over-

view of Digital Audio Interface Data Structures [3].

For further information on S/PDIF recommended

transformers see application note AN134: AES and

S/PDIF Recommended Transformers [4].

7. EXCLUSIVE FUNCTIONS

Some of the digital pins on the CS4202 have mul-

tiplexed functionality. These functions are mutual-

ly exclusive and cannot be requested at the same

time. The following pairs of functions are mutually

exclusive:

•

GPIO and Serial Data Port (GPIO0 pin is

shared with LRCLK pin, GPIO1 pin is shared

with SDOUT pin, and GPIO4 pin is shared with

SDO2 pin)

•

EAPD and Serial Data Port Serial Clock

(EAPD pin is shared with SCLK pin)

Use of the GPIO0/LRCLK, GPIO1/SDOUT, and

GPIO4/SDO2 pins for serial data port has priority

over their GPIO functionality. There is no priority

assigned to the other exclusive function. A function

currently in use must be disabled or powered down

before the corresponding exclusive function can be

enabled. The following control bits for these func-

tions will behave differently than normal bits: the

EAPD bit in the Powerdown Control/Status Regis-

ter (Index 26h), the GC[4,1:0] bits in the GPIO Pin

Configuration Register (Index 4Ch), and the

SDO2, and SDSC bits in the Serial Port Control

read-only bits if they control a feature that is cur-

rently unavailable because the corresponding ex-

clusive

feature

already

use,

the

corresponding master control for this feature is not

set.

0.1

µF

DGND

DVdd

SPDIF_OUT

TOTX-173

SPDIF_OUT

+5V_PCI

DGND

8.2 k

Ω

DGND

3.3V

247.5

Ω

107.6

Ω

375

Ω

93.75

Ω

Figure 15. S/PDIF Output

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