
Preliminary Product Information
This document contains information for a new product.
Cirrus Logic reserves the right to modify this product without notice.
1
Copyright
Cirrus Logic, Inc. 1998
(All Rights Reserved)
Cirrus Logic, Inc.
Crystal Semiconductor Products Division
P.O. Box 17847, Austin, Texas 78760
(512) 445 7222 FAX: (512) 445 7581
http://www.crystal.com
CS4912
Multi-Function Digital Audio Processor
Features
l
24-bit DSP with On-chip Program RAM, Data
RAM, and Stereo DAC
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24x24 Multiplier with 48-bit Accumulator
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CD Quality Stereo DAC with Output Filter
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I
2
C
or SPI Serial Control Port
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Integrated S/PDIF Digital Transmitter Port
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Serial Audio Port, up to 4 In/6 Out
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Asynchronous Audio Input Port
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Programmable Phase Locked Loop
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+5 Volt Only CMOS, 44-pin PLCC
Crystal DSP Application Firmware Kits
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Car Audio Processing for Head or Amp Units
—
Crossover Filters, Parametric or Graphic EQs
—
Compressor, Peak Limiter, Noise Gate
—
4-channel Adjustable Time Delay
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Dolby
Surround Pro Logic Decoder
—
Multiple Output Configurations
—
3D Virtual Surround for 2 Speaker Playback
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Musical Instrument Reverb/Effects
Description
The CS4912 is a highly integrated and cost effective au-
dio processing system for a variety of applications. This
device integrates a 24-bit DSP with on-chip program and
data RAM, a stereo DAC, a full-duplex serial audio inter-
face, a digital audio transmitter, an asynchronous audio
input port, a serial control port, and a phase-locked loop
clock generator. The CS4912 may be coupled with an
ADC such as the CS5331 for 2-in / 2-out audio applica-
tions. A 2-in / 4-out system would include the CS4912
and a stereo CODEC (CS4222), and a 4-in / 6-out sys-
tem can be built using the CS4912 with two CODECs
and a small amount of external logic.
The CS4912 is configured for specific applications by
DSP code loaded into the on-chip RAM. The device can
be initialized by an external microcontroller, or booted di-
rectly from a serial EEPROM using a small amount of
external logic. The CRD4912 board is an evaluation plat-
form for the CS4912, with complete documentation to
simplify the design process. CS4912 application firm-
ware kits are available for Car Audio Processing, Dolby
Pro Logic Decoding, and Reverb/Effects applications.
Ordering information for the application firmware kits is
included in the CRD4912 data sheet.
ORDERING INFORMATION
CS4912-CL
CRD4912-01
44-pin PLCC
Reference Design Kit
SCK/SCL
SDA/CDOUT
CDIN
CS
REQ
SERIAL CONTROL PORT (SPI OR I
2
C)
AUXLR
AUXIN
AUXOUT
AUXCLK
FSYNC
SCLK
SDATA
AUXILIARY
AUDIO
PORT
ASYNC
AUDIO
PORT
RESET
BOOT
DSP
FLT
CLKIN
CLKOUT
PLL
+
CLOCK MANAGER
STEREO DAC
AOUTM
AOUTL
AOUTR
S/PDIF
TX
TRANSMITTER
PROG.
I/O PINS
PIO
XF1
XF2
XF3
XF4
DEC
‘98
DS282PP2