CS8412-CS 查看數據表（PDF） - Cirrus Logic

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CS8412-CS

Digital Audio Interface Receiver

Cirrus Logic 

CS8411 CS8412

CS8412 DESCRIPTION

The CS8412 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 CS8412 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

CS8412 is illustrated in Figure 16.

The line receiver and jitter performance are de-

scribed in the sections directly preceding the

CS8411 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).

Normal Modes (M3 = 0)

When M3 is low, the normal serial port formats

shown in Figure 17 are selected using M2, M1, and

M0. These formats are also listed in Table 3,

VA+

22

9

RXP

RXN 10

FILT AGND MCK

20 21

19

Clock & Data

Recovery

Bi-phase

Decoder

and

Frame

Sync

Timing

De-Multiplexer

VD+

DGND

CS12/

FCK

7

8

Parity

Check

13

Frequency

Comparator

3

Error

Encoder

3

CRC

check

Channel

Status

Latch

16

SEL

6

6

Multiplexer

6 5 4 3 2 27

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

E0 E1 E2 F0 F1 F2

Figure 16. CS8412 Block Diagram

M3 M2 M1 M0

17 18 24 23

Audio

Serial

Port

11

FSYNC

12

SCK

26

SDATA

1

R

C

14

e

U

g

28

i

VERF

s

t

15

e

CBL

r

s

25

ERF

DS61F1

23

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