CS4299 datasheet(11/52 Pages) CIRRUS

11 / 52 page

CS4299

Slot 2. Write operations are similar, with the regis-

ter index in Slot 1 and the write data in Slot 2 of a

SDATA_OUT frame. The function of each input

and output frame is detailed in Section 3, AC Link

Frame Definition. Individual register descriptions

are found in Section 4, Register Interface.

2.3

Sample Rate Converters

The Sample Rate Converters (SRCs) provide high

accuracy digital filters supporting sample frequen-

cies other than 48 kHz to be captured from the

CS4299 or played from the controller. AC ’97 re-

quires support for two audio rates (44.1 and

48kHz). In addition, the Intel® I/O Controller Hub

(ICHx) specification requires support for five more

audio rates (8, 11.025, 16, 22.05, and 32). The

CS4299 supports all these rate, as shown in Table 7

on page 29.

2.4

Output Mixer

The CS4299 has two output mixers, illustrated in

Figure 8. The stereo output mixer sums together

the analog inputs to the CS4299, including the

PC_BEEP and PHONE signals, according to the

settings in the volume control registers. The stereo

output mix is sent to the LINE_OUT and

ALT_LINE_OUT pins on the CS4299. The mono

output mixer generates a monophonic sum of the

left and right channels from the stereo input mixer.

The mono output mix is sent to the MONO_OUT

output pin on the CS4299.

2.5

Input Mux

The input multiplexer controls which analog input

is sent to the ADCs. The output of the input mux is

converted to stereo 18-bit digital PCM data and

sent to the controller by means of the AC-link

SDATA_IN signal.

2.6

Volume Control

The CS4299 volume registers control analog input

levels to the input mixer and analog output levels,

including the master volume level, and the alternate

volume level. The PC_BEEP volume control uses

3 dB steps with a range of 0 dB to -45 dB attenua-

tion. All other analog volume controls use 1.5 dB

steps. The analog inputs have a mixing range of

+12 dB signal gain to -34.5 dB signal attenuation.

The analog output volume controls have from 0 dB

to -94.5 dB attenuation for LINE_OUT and from

0 dB to -46.5 dB attenuation for ALT_LINE_OUT

and MONO_OUT.

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