CS4294SLASHCS4298 datasheet(12/66 Pages) CIRRUS

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CS4202

DS549PP2

2. GENERAL DESCRIPTION

The CS4202 is a mixed-signal serial audio codec

with integrated headphone power amplifier com-

pliant with the Intel® Audio Codec ’97 Specifica-

tion, revision 2.2 [6] (referred to as AC ’97). It is

designed to be paired with a digital controller, typ-

ically located on the PCI bus or integrated within

the system core logic chip set. The controller is re-

sponsible for all communications between the

CS4202 and the remainder of the system. The

CS4202 contains two distinct functional sections:

digital and analog. The digital section includes the

AC-link interface, S/PDIF interface, serial data

port, GPIO, power management support, and Sam-

ple Rate Converters (SRCs). The analog section in-

cludes the analog input multiplexer (mux), stereo

input mixer, stereo output mixer, mono output mix-

er, headphone amplifier, stereo Analog-to-Digital

Converters (ADCs), stereo Digital-to-Analog Con-

verters (DACs), and their associated volume con-

trols.

2.1

AC-Link

All communication with the CS4202 is established

with a 5-wire digital interface to the controller

called the AC-link. This interface is shown in

Figure 7. All clocking for the serial communication

is synchronous to the BIT_CLK signal. BIT_CLK

is generated by the primary audio codec and is used

to clock the controller and any secondary audio co-

decs. Both input and output AC-link audio frames

are organized as a sequence of 256 serial bits form-

ing 13 groups referred to as ‘slots’. During each au-

dio frame, data is passed bi-directionally between

the CS4202 and the controller. The input frame is

driven from the CS4202 on the SDATA_IN line.

The output frame is driven from the controller on

the SDATA_OUT line. The controller is also re-

sponsible for issuing reset commands via the RE-

SET# signal. Following a Cold Reset, the CS4202

is responsible for notifying the controller that it is

ready for operation after synchronizing its internal

functions. The CS4202 AC-link signals must use

the same digital supply voltage as the controller, ei-

ther +5 V or +3.3 V. See Section 3, AC-Link Frame

Definition, for detailed AC-link information.

CODEC

SYNC

BIT_CLK

SDATA_OUT

SDATA_IN

RESET#

Digital AC'97

Controller

AC'97

Figure 7. AC-link Connections

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