Cirrus Logic CS485xx - Manual

Copyright
 Cirrus Logic, Inc. 2011
(All Rights Reserved)
http://www.cirrus.com
DS734F5
OCT '11
CS485xx Family Data Sheet
Features

Cost-effective, High-performance 32-bit DSP

300,000,000 MAC/S (multiply accumulates per second)

Dual MAC cycles per clock

72-bit accumulators are the most accurate in the industry

24k x 32 SRAM, 2k blocks - assignable to data or program

Internal ROM contains a variety of configurable sound
enhancement feature sets

8-channel internal DMA

Internal watch-dog DSP lock-up prevention

DSP Tool Set w/ Private Keys for Protecting Customer IP

Configurable Serial Audio Inputs/Outputs

Configurable for all input/output types

Maximum 32-bit @ 192 kHz

Supports 32-bit audio sample I/O between DSP chips

TDM input modes (multiple channels on same line)

192 kHz SPDIF transmitter

Multi-channel DSD direct stream digital SACD input

Supports Two Different Input Fs Sample Rates

Output can be master or slave

Dual processing path capability

Input supports dual domain slave clocking

Hardware assist time sampling for sample rate conversion

Integrated Clock Manager/PLL

Can operate from external crystal, external oscillator

Input Fs Auto Detection

Host & Boot via Serial Interface

Configurable GPIOs and External Interrupt Input

1.8V Core and a 3.3V I/O that is tolerant to 5V input

Low-power Mode

“Energy Star ® Ready” in low-power mode, 268 µW in standby
Differentiating from the legacy Cirrus multi-standard, multi-channel
decoders, this new CS485xx family is still based on the same
high-performance 32-bit fixed point Digital Signal Processor core
but instead is equipped with much less memory, tailoring it for more
cost-effective applications associated with multi-channel and
virtual-channel sound enhancements. Target applications are:

Digital Televisions

Multimedia Peripherals

iPod ® Docking Stations

Automotive Head Units

Automotive Outboard Amplifiers

HD-DVD ™ and Blu-ray Disc ® DVD Receivers

PC Speakers
There are also a wide variety of licensable DSP codes available
today as seen by the following examples:
Cirrus also has developed, or is developing their own royalty-free
versions of popular features sets like Cirrus Bass Manager, Cirrus
Dynamic Volume Leveler, Cirrus Original Multichannel Surround,
Cirrus Virtual Speaker & Cirrus 3D-Audio.
The CS485xx family is programmed using the Cirrus proprietary
DSP Composer
™ GUI development tool. Processing chains may be
designed using a drag-and-drop interface to place/utilize functional
macro audio DSP primitives. The end result is a software image that
is down-loaded to the DSP via serial host or serial boot modes.
See Section 6 for ordering information.
CS485xx Block Diagram
32-bit
DSP
D
M
A
P X Y
Serial
Control 1
12 Ch PCM
Audio Out
GPIO Debug
Watchdog
TMR1
TMR2
PLL
S/PDIF
12 Ch. Audio In /
6 Ch. SACD In
CS485xx