CS485NI-XYZR View Datasheet(PDF) - Cirrus Logic

Part Name

Description

Manufacturer

CS485NI-XYZR

32-bit Audio Decoder DSP Family

Cirrus Logic 

CS485xx Family Data Sheet

32-bit Audio Decoder DSP Family

Table 2. Device and Firmware Selection Guide

Device

Suggested

Application

Channel Count

Input/Output

Package

Digital TV

Portable Audio Docking Station

CS48520-CQZ

Portable DVD

DVD Mini / Receiver

Up to 4 channel in / 4

channel out

48-pin QFP

Multimedia PC Speakers

CS48540-CQZ

CS48540-DQZ

CS48560-CQZ

CS48560-DQZ

CS48520 features Plus

8 Channel Car Audio

DVD Receiver

CS48540 features Plus

12 channel Car Audio

High-end Digital TV

Dual Source/Dual Zone

SACD

4. Hardware Functional Description

Up to 8 channel in / 8

T channel out

48-pin QFP

F Up to 12 channel in /12

DRA channel out

48-pin QFP

4.1 DSP Core

L I The CS485xx family DSPs are single-core DSP with separate X and Y data and P code memory

spaces. The DSP core is a high-performance, 32-bit, user-programmable, fixed-point DSP that is

IA H capable of performing two multiply-and-accumulate (MAC) operations per clock cycle. The DSP core

has eight 72-bit accumulators, four X- and four Y-data registers, and 12 index registers.

T P The DSP core is coupled to a flexible DMA engine. The DMA engine can move data between

peripherals such as the serial control port (SCP), digital audio input (DAI) and digital audio output

N L (DAO), or any DSP core memory, all without the intervention of the DSP. The DMA engine off loads

data move instructions from the DSP core, leaving more MIPS available for signal processing

E E instructions.

ID D CS485xx family functionality is controlled by application codes that are stored in on-board ROM or

downloaded to the CS485xx from a host controller or external serial FLASH/EEPROM.

Users can develop their applications using DSP Composer to create the processing chain and then

F compile the image into a series of commands that are sent to the CS485xx through the SCP. The

processing application can either load modules (matrix-processors, virtualizers, post-processors)

N from the DSPs on-board ROM, or custom firmware can be downloaded through the SCP.

The CS485xx is suitable for a variety of audio post-processing applications such as automotive

O head-ends, automotive amplifiers, and boom boxes.

C 4.1.1 DSP Memory

The DSP core has its own on-chip data and program RAM and ROM and does not require external

memory for post-processing applications.

The Y-RAM and P-RAM share a single block of memory that can be configured to make Y and P

equal in size, or more memory can be allocated for Y-RAM in 2kword blocks.

DS734F2

©Copyright 2008 Cirrus Logic, Inc.

7

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