
Copyright
Cirrus Logic, Inc. 1997
(All Rights Reserved)
CS4235
Advanced Product Databook
CrystalClear
Low Cost ISA Audio System
FEATURES
I
Compatible with Sound Blaster, Sound Blaster
Pro, and Windows Sound System
I
Advanced MPC3-Compliant Input and Output
Mixer
I
Enhanced Stereo Full Duplex Operation
I
Dual Type-F DMA Support
I
Integrated CrystalClear 3D Stereo
Enhancement
I
Industry Leading Delta-Sigma Data Converters
(86 dB FS A)
I
Internal Default PnP Resources
I
CS9236 Wavetable Interface
I
CS4610 Audio Accelerator Interface
I
CS4236B/CS4237B/CS4238B Register
Compatible
DESCRIPTION
The CS4235 is a single chip multimedia audio system
that is pin-compatible to the CS423xB for many de-
signs. The product includes an integrated FM
synthesizer and a Plug-and-Play interface. In addition,
the CS4235 includes hardware master volume control
pins as well as extensive power management and 3D
sound technology. The CS4235 is compatible with the
Microsoft
Windows Sound System standard and will
run software written to the Sound Blaster and Sound
Blaster Pro interfaces. The CS4235 is fully compliant
with Microsoft’s PC’97 and PC’98 audio requirements.
ORDERING INFO
CS4235-JQ
CS4235-KQ
100 pin TQFP, 14x14x1.4mm
100 pin TQFP, 14x14x1.4mm
GAIN
GAIN
GAIN
ATTN
L/RAUX1
L/RAUX2
CMAUX2
MIC
MIN
Σ
ATTN
OSCILLATOR
VREF
L/ROUT
INPUT MIXER
OUTPUT MIXER
Σ
VREF
XTALI
XTALO
ISA
BUS
INTERFACE
PLUG
AND
PLAY
CODEC
REG
I/F
Config
IO
IRQ
DMA
CD-ROM or
Upper Address Bits
Decode
Logic
DACK<A:C>
DRQ<A:C>
IRQ<A:G>
IOCHRDY
AEN
IOW
IOR
SA<11:0>
SD<7:0>
FM
Synthesizer
ANALOG
JOYSTICK
LOGIC
MPU-401
UART
with
FIFOS
WSS
SBPRO
Registers
EEPROM
Interface
SDA
SCL
JOYSTICK
MIDI
BRESET
Stereo
DAC2
CS9236
WAVETABLE
INTERFACE
SA<12:15)
(CDROM)
SERIAL PORT
Stereo
ADC1
3D
Enhancement
FIFO
Stereo
DAC1
SERIAL PORT
CS4610
INTERFACE
FIFO
Hardware
Volume Control
UP
DOWN
MUTE
NOV ‘97
DS252PP2