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CS8413

96 kHz Digital Audio Receiver

Cirrus Logic 

CS8413 CS8414

contained at the end of the Status and IEnable Reg-

isters section.

CS8414 DESCRIPTION

The CS8414 does not need a microprocessor to

handle the non-audio data (although a micro may

be used with the C and U serial ports). Instead, ded-

icated pins are available for the most important

channel status bits. The CS8414 is a monolithic

CMOS circuit that receives and decodes digital au-

dio data which was encoded according to the digital

audio interface standards. It contains an RS422 line

receiver and clock and data recovery utilizing an

on-chip phase-locked loop. The audio data is out-

put through a configurable serial port that supports

14 formats. The channel status and user data have

their own serial pins and the validity flag is OR’ed

with the ERF flag to provide a single pin, VERF,

indicating that the audio output may not be valid.

This pin may be used by interpolation filters that

provide error correction. A block diagram of the

CS8414 is illustrated in Figure 16.

The line receiver and jitter performance are de-

scribed in the sections directly preceding the

CS8413 sections in the beginning of this data sheet.

Audio Serial Port

The audio serial port is used primarily to output au-

dio data and consists of three pins: SCK, FSYNC,

and SDATA. These pins are configured via four

control pins: M0, M1, M2, and M3. M3 selects be-

tween eight normal serial formats (M3 = 0), and six

special formats (M3 = 1).

VA+

22

RXP 9

RXN

10

FILT AGND MCK

20

21

19

Clock & Data

Recovery

Bi-phase

Decoder

and

Frame

Sync

Timing

De-Multiplexer

7

VD+

8

DGND

CS12/ 13

FCK

Parity

Check

Frequency

Comparator

3

Error

Encoder

3

CRC

check

Channel

Status

Latch

SEL 16

6

6

Multiplexer

6 5 4 3 2 27

C0/ Ca/ Cb/ Cc/ Cd/ Ce/

E0 E1 E2 F0 F1 F2

Figure 16. CS8414 Block Diagram

20

M3 M2 M1 M0

17 18 24 23

Audio

Serial

Port

R

e

g

i

s

t

e

r

s

11

FSYNC

12

SCK

26

SDATA

1

C

14

U

28

VERF

15

CBL

25

ERF

DS240F1

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