CS4294-JQ datasheet(10/42 Pages) CIRRUS

Nome de Peças	CS4294-JQ

Descrição Electrónicos	SoundFusion Audio/Docking Codec 97 (AMC 97)

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Fabricante Electrônico	CIRRUS [Cirrus Logic]

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CS4294

10

DS326PP4

2. GENERAL DESCRIPTION

2.1

Overview

The CS4294 is a Mixed-Signal Audio Codec based

on the AC ‘97 1.0 Specification, and the AC ‘97

2.0 Extensions. It is designed to be paired with a

digital controller, typically located on the PCI bus.

The Controller is responsible for all communica-

tions between the CS4294 and the rest of the sys-

tem. The CS4294 functions as an analog mixer, a

stereo audio ADC, a stereo audio DAC, and a con-

trol and digital stream interface to the Controller.

The CS4294 contains three distinct functional sec-

tions: Digital, Analog Audio, and Extended Analog

Audio.

The Digital section includes the AC-Link registers,

power management support, SYNC detection cir-

cuitry, and AC-Link serial port interface logic. The

Analog Audio section includes the analog input

multiplexer (mux), stereo input mixer, stereo out-

put mixer, stereo ADCs, stereo DACs, and analog

volume controls. The Extended Audio section in-

cludes dual ADCs, dual DACs, GPIO control and

status, and power down and wake-up logic.

2.2

Modes of Operation

The CS4294 has two basic modes of operation.

Each mode allows varying functionality to meet a

wide variety of software and hardware configura-

tions. On power up or system reset, the device re-

verts to the basic configuration Mode 0. The four

channel expansion and enhanced digital docking

are activate in Mode 1.

2.2.1 Mode 0

This is the default operating mode for the CS4294.

It supports the legacy AC ‘97 audio modes of oper-

ation including audio mixer, ADC’s, and DAC’s.

2.2.2 Mode 1

Mode 1 is the four channel expansion mode. The

second ADC/DAC pairs are utilized for enhanced

audio functionality. The second stereo DAC’s are

routed to the alternate line audio outputs providing

2 additional audio channels. The secondary ADC

inputs may be connected to the output of the analog

stereo input mixer for enhanced audio effect pro-

cessing or enhanced digital docking in a note book

application.

3. DIGITAL SECTION

3.1

AC-Link

All communication with the Codec is established

with a 5-wire digital interface to the Controller chip

as shown in Figure 7. All clocking for the serial

communication is synchronous to the BIT_CLK

signal. BIT_CLK is generated by the primary Co-

dec and is used to slave the Controller and any sec-

ondary Codecs, if applicable. An AC-link audio

frame is a sequence of 256 serial bits organized into

13 groups referred to as ‘slots’. One frame consists

of one 16-bit slot and twelve 20-bit slots. During

each audio frame, data is passed bi-directionally

between the Codec and the Controller. The input

frame is driven from the Codec on the SDATA_IN

line. The output frame is driven from the Controller

SDATA_OUT line. Both input and output frames

contain the same number of bits and are organized

with the same ‘slot’ configuration. The input and

output frame have differing functions for each slot.

The Controller synchronizes the beginning of a

frame with the SYNC signal. In Figure 9 the posi-

tion of each bit location within the frame is noted.

The first bit position in a new serial data frame is F0

and the last bit position in the serial data frame is

F255. When SYNC goes active (high) and is sam-

pled active by the CS4294 (on the falling edge of

BIT_CLK), both devices are synchronized to a new

serial data frame. The data on the SDATA_OUT

pin at this clock edge is the final bit of the previous

frame’s serial data. On the next rising edge of

BIT_CLK, the first bit of Slot 0 is driven by the

Controller on the SDATA_OUT pin. The CS4294

latches in this data, as the first bit of the frame, on

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