CS8411 datasheet(9/38 Pages) CIRRUS

номер детали	CS8411

подробное описание детали	DIGITAL AUDIO INTER FACE RECEIVER

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производитель	CIRRUS [Cirrus Logic]

домашняя страница	http://www.cirrus.com

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CS8411 CS8412

DS61F1

9

status registers are visible and all interrupts are dis-

abled. The IER/SR bit must be set to make the IEn-

able registers visible.

Status register 1 (SR1), shown in Figure 6, reports

all the conditions that can generate a low pulse,

four SCLK cycles wide, on the interrupt pin (INT).

The three least significant bits, FLAG2-FLAG0,

are used to monitor the ram buffer. These bits con-

tinually change and indicate the position of the

buffer pointer which points to the buffer memory

location currently being written. Each flag has a

corresponding interrupt enable bit in IEnable regis-

ter 1 which, when set, allows a transition on the flag

to generate a pulse on the interrupt pin. FLAG0 and

FLAG1 cause interrupts on both edges whereas

FLAG2 causes an interrupt on the rising edge only.

Further information, including timing, on the flags

can be found in the Buffer Memory section.

The

bits;

ERF,

SLIP,

CCHG,

CRCE/CRC1, and CSDIF/CRC2, are latches

which are set when their corresponding conditions

occur, and are reset when SR1 is read. Interrupt

pulses are generated the first time that condition oc-

curs. If the status register is not read, further in-

stances of that same condition will not generate

another interrupt. ERF is the error flag bit and is set

when the ERF pin goes high. It is an OR’ing of the

errors listed in status register 2, bits 0 through 4,

AND’ed with their associated interrupt enable bits

in IEnable register 2.

A4/

13

VA+

FILT

AGND

MCK

19

21

22

20

9

10

SDATA

23

24

FCK

A0-

A3

D0-

D7

48

11

SCK

FSYNC

12

26

CS

RD/WR

4 X 8

25

ERF

14

INT

Buffer

Memory

28 X 8

Control

Registers

2 X 8

De-Multiplexor

Audio

Serial

Port

C.S.

user

aux

crc

check

no lock

Bi-phase

parity

validity

crc

slipped

RXP

RXN

7

8

VD+

DGND

Clock & Data

Recovery

Bi-phase

Decoder

Frequency

Comparator

IEnable

&

Status

Figure 4. CS8411 Block Diagram

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