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CS4299
11
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.
DS319PP6 11
CS4299
- CrystalClear 1
- SoundFusion™ Audio Codec ‘97 1
- TABLE OF CONTENTS 2
- LIST OF FIGURES 3
- LIST OF TABLES 4
- CS4299-KQZ only) 6
- 7
- CODEC_READY 8
- 2. GENERAL DESCRIPTION 10
- 2.1 AC-Link 10
- 2.2 Control registers 10
- 2.3 Sample Rate Converters 11
- 2.4 Output Mixer 11
- 2.5 Input Mux 11
- 2.6 Volume Control 11
- 3. AC LINK FRAME DEFINITION 13
- 3.2 AC-Link Audio Input Frame 16
- 18 DS319PP6 18
- 4. REGISTER INTERFACE 19
- Mute0000000000GN4GN3GN2GN1GN0 22
- 00000SL2SL1SL000000SR2SR1SR0 25
- 003D000MIXMSLPBK0000000 26
- 000000000000S3S2S1S0 26
- ID1ID00000AMAP00000000VRA 28
- 000000000000000VRA 28
- 0000000DDMAMAP0SM1SM00000 30
- 5. POWER MANAGEMENT 33
- 5.1 AC ’97 Reset Modes 33
- 5.1.1 Cold AC ‘97 Reset 33
- 5.1.2 Warm AC ’97 Reset 33
- 5.1.3 Register AC ’97 Reset 33
- 5.2 Powerdown Controls 34
- DVdd S/PDIF 35
- 6. ANALOG HARDWARE 36
- DESCRIPTION 36
- 6.1 Analog Inputs 36
- 6.1.1 Line-Level Inputs 36
- 6.1.2 CD Input 36
- 6.1.3 Microphone Inputs 37
- 6.1.4 PC Beep Input 37
- 6.1.5 Phone Input 38
- 6.2 Analog Outputs 38
- 6.2.1 Stereo Outputs 38
- 6.2.2 Mono Output 38
- 6.4 Power Supplies 39
- 6.5 Reference Design 39
- 7. SONY/PHILIPS DIGITAL 40
- INTERFACE (S/PDIF) 40
- 8. GROUNDING AND LAYOUT 40
- DS319PP6 41 41
- CS4299-xQ 42
- Audio I/O 43
- Clock and Configuration 44
- Misc. Digital Interfaces 45
- Power Supplies 46
- 11. REFERENCE DESIGN 49
- 12. REFERENCES 50
- 48L LQFP PACKAGE DRAWING 51
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