Cirrus Logic CS485xx - Manual (Page 9)

1-1 Copyright 2009 Cirrus Logic, Inc. DS734UM7
Overview
CS485xx Hardware User’s Manual
Chapter 1
Introduction
1.1 Overview
The CS485xx is a programmable audio DSP that combines a programmable, 32-bit fixed-point, general-
purpose DSP with dedicated audio peripherals. Its “audio-centric” interfaces facilitate the coding of high-
precision audio applications and provide a seamless connection to external audio peripheral ICs.
The CS485xx can be used as a ROM-based processor in systems that require only the applications stored
in on-board ROM, or it can operate as a RAM-based processor in systems that require custom code. The
CS485xx provides up to 150 MIPS of processing power and includes several 3
rd
party algorithms in ROM. It
has been designed with a generous amount of on-chip program and data RAM, and has all necessary
peripherals required to support the latest standards in consumer entertainment products. In addition,
external serial Flash memory can be attached to the serial control port (SCP) for storage of run-time
parameters, or as a boot-ROM for custom applications. This device is suitable for a variety of high-
performance audio applications. These include:
• Digital TVs
• Car Audio Head Units and Amplifiers
• Portable DVDs
• DVD Mini/Receivers
• Portable Audio Docking Stations
• Shelf Systems
• Digital Speakers
1.1.1 Chip Features
• 3
rd
Party Processing Algorithms in ROM
• Dual-path Audio Processing on Audio
Outputs
• Low-power Standby Mode • 192 kHz S/PDIF Transmitter
• Up to 12-channel Serial Audio Inputs
• Serial Control Port Using SPI
™
or I
2
C
™
• Up to 12-channel Serial Audio Outputs
• 6-channel Direct Stream Digital
®
(DSD) Input
Port for High-resolution Audio
• Customer Software Security Keys • GPIO Support for All Common Sub-circuits
• Large On-chip X,Y, and Program RAM & ROM • Hardware Watchdog Timer
• Dual Clock Domains on Audio Inputs