CS47048C-DQZR - Cirrus Logic Inc

http://www.cirrus.com DS787PP9

JUL '12

CS470xx 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 highest precision in the

industry

32K x 32-bit SRAM with three 2K blocks assignable to

either Y data or program memory

Integrated DAC and ADC Functionality

8† Channels of 24-bit DAC output: 108dB DR, –98 dB

THD+N

4† Channels of 24-bit ADC input: 105dB DR, –98 dB

THD+N

Integrated 5:1 analog mux feeds one stereo ADC

Configurable Serial Audio Inputs and Outputs

Integrated 192 kHz S/PDIF Rx

Integrated 192 kHz S/PDIF Tx

Supports 32-bit serial data @ 192 kHz

Supports 32-bit audio sample I/O between DSP chips

TDM I/O modes

Supports Different Sample Rates (Fs)

Three integrated hardware SRC blocks

Output can be master or slave

Supports dual-domain Fs on S/PDIF vs. I²S inputs

DSP Tool Set with Private Keys Protect Customer IP

Integrated Clock Manager/PLL

Flexibility to operate from internal PLL, external crystal,

external oscillator

Input Fs Auto Detection w/ µC Acknowledgement

Host Control and Boot via I²C™ or SPI™ 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

“†” features differ on CS47024, CS47028, or CS47048.

See Table 3-1.

The CS470xx family is a new generation of audio

system-on-a-chip (ASOC) processors targeted at high

fidelity, cost sensitive designs. Derived from the highly

successful CS48500 32-bit fixed-point audio enhancement

processor family, the CS470xx further simplifies system

design and reduces total system cost by integrating the S/

PDIF Rx, S/PDIF Tx, analog inputs, analog outputs, and

SRCs. For example, a hardware SRC can down-sample a

192 kHz S/PDIF stream to a lower Fs to reduce memory

and MIPS requirements for processing. This integration

effectively reduces the chip count from 3 to 1, which allows

smaller, less expensive board designs.

Target applications include:

Automotive head units and outboard amplifiers

Automotive processors and automotive integration hubs

Digital TV

MP3 docking stations

AVR and DVD RX

DSP controlled speakers (subwoofers, sound bars)

The CS470xx is programmed using the simple yet powerful

Cirrus proprietary DSP Composer™ GUI development and

pre-production tuning tool. Processing chains can be

designed using a drag-and-drop interface to place/utilize

functional macro audio DSP primitives and custom audio

filtering blocks. The end result is a software image that is

downloaded to the DSP via serial control port.

The Cirrus Framework™ programming environment offers

Assembly and C language compilers and other software

development tools for porting existing code to the CS470xx

family platform.

The CS470xx is available in a 100-pin LQFP package with

exposed pad for better thermal characteristics. Both

Commercial (0°C to +70°C) and Automotive (–40°C to

+85°C) temperature grades.

Ordering Information:

See Section 6 for ordering information.

CS470xx

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CS47048 Block Diagram

DAC0

text

Coyote 32-bit Core

in the CS47048 DSP

DMA

SPI / I2C

Control

I2S

ADC0/1

I2S

I2S / S/PDIF

PLL

ROM

Peripheral Bus

Clock

Manager Timers

RAM

GPIO

DAC1

DAC2

DAC3

DAC4

DAC5

DAC6

DAC7

MUX

1ROM

RAM

ROM

RAM PY

32K x 32-bit SRAM with three 2K blocks

Assignable to Program or Y Data memory

Memory Bus

I2S /

S/PDIF

Stereo Inputs

On Analog in

ADC2/3

DBC

(I2C Slave)

PIC

ADC’s & DAC’s operate

in Single ended or

Differential mode

8ch

SRC3 has 8

independent Channels

for In or Out

4ch

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Contacting Cirrus Logic Support

For all product questions and inquiries, contact a Cirrus Logic Sales Representative.

To find the one nearest you, go to www.cirrus.com.

IMPORTANT NOTICE

Cirrus Logic, Inc. and its subsidiaries (“Cirrus”) believe that the information contained in this document is accurate and reliable. However, the information is subject to change

without notice and is provided “AS IS” without warranty of any kind (express or implied). Customers are advised to obtain the latest version of relevant information to verify,

before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order

acknowledgment, including those pertaining to warranty, indemnification, and limitation of liability. No responsibility is assumed by Cirrus for the use of this information,

including use of this information as the basis for manufacture or sale of any items, or for infringement of patents or other rights of third parties. This document is the property

of Cirrus and by furnishing this information, Cirrus grants no license, express or implied under any patents, mask work rights, copyrights, trademarks, trade secrets or other

intellectual property rights. Cirrus owns the copyrights associated with the information contained herein and gives consent for copies to be made of the information only for

use within your organization with respect to Cirrus integrated circuits or other products of Cirrus. This consent does not extend to other copying such as copying for general

distribution, advertising or promotional purposes, or for creating any work for resale.

CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR

ENVIRONMENTAL DAMAGE (“CRITICAL APPLICATIONS”). CIRRUS PRODUCTS ARE NOT DESIGNED, AUTHORIZED OR WARRANTED FOR USE IN PRODUCTS

SURGICALLY IMPLANTED INTO THE BODY, AUTOMOTIVE SAFETY OR SECURITY DEVICES, LIFE SUPPORT PRODUCTS OR OTHER CRITICAL APPLICATIONS.

INCLUSION OF CIRRUS PRODUCTS IN SUCH APPLICATIONS IS UNDERSTOOD TO BE FULLY AT THE CUSTOMER’S RISK AND CIRRUS DISCLAIMS AND MAKES

NO WARRANTY, EXPRESS, STATUTORY OR IMPLIED, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR PARTICULAR

PURPOSE, WITH REGARD TO ANY CIRRUS PRODUCT THAT IS USED IN SUCH A MANNER. IF THE CUSTOMER OR CUSTOMER’S CUSTOMER USES OR PERMITS

THE USE OF CIRRUS PRODUCTS IN CRITICAL APPLICATIONS, CUSTOMER AGREES, BY SUCH USE, TO FULLY INDEMNIFY CIRRUS, ITS OFFICERS, DIRECTORS,

EMPLOYEES, DISTRIBUTORS AND OTHER AGENTS FROM ANY AND ALL LIABILITY, INCLUDING ATTORNEYS’ FEES AND COSTS, THAT MAY RESULT FROM OR

ARISE IN CONNECTION WITH THESE USES.

Cirrus Logic, Cirrus, the Cirrus Logic logo designs, Framerwork, and DSP Composer are trademarks of Cirrus Logic, Inc. All other brand and product names in this document

may be trademarks or service marks of their respective owners.

SPI is a trademark of Motorola, Inc.

I²C is a trademark of Philips Semiconductor.

Dolby, Pro Logic, Dolby Headphone, Virtual Speaker and the double-D symbol are registered trademarks of Dolby Laboratories, Inc. Supply of an implementation of Dolby

Technology does not convey a license nor imply a right under any patent, or any other industrial or Intellectual Property Right of Dolby Laboratories, to use the Implementation

in any finished end-user or ready-to-use final product. It is hereby notified that a license for such use is required from Dolby Laboratories.

SRS CircleSurround II technology is incorporated under license from SRS Labs, Inc. The SRS Circle Surround II technology/solution rights incorporated in the Cirrus Logic

CS470xx products are owned by SRS Labs, a U.S. Corporation and licensed to Cirrus Logic, Inc. Purchaser of the Cirrus Logic CS470xx products must sign a license for use

of the chip and display of the SRS Labs trademarks. Any products incorporating the Cirrus Logic CS470xx products must be sent to SRS Labs for review. SRS CircleSurround

II is protected under US and foreign patents issued and/or pending. SRS Circle Surround II, SRS and (O) symbol are trademarks of SRS Labs, Inc. in the United States and

selected foreign countries. Neither the purchase of the Cirrus Logic CS470xx products, nor the corresponding sale of audio enhancement equipment conveys the right to sell

commercialized recordings made with any SRS technology/solution. SRS Labs requires all set makers to comply with all rules and regulations as outlined in the SRS

Trademark Usage Manual.

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1 Documentation Strategy

The CS470xx Data Sheet describes the CS47048, CS47028, and CS47024 audio processors. This document should be

used in conjunction with the following documents when evaluating or designing a system around the CS470xx processors.

Table 1-1. CS470xx Related Documentation

The scope of the CS470xx Data Sheet is primarily the hardware specifications of the CS470xx family of devices. This

includes hardware functionality, characteristic data, pinout, and packaging information.

The intended audience for the CS470xx Data Sheet is the system PCB designer, MCU programmer, and the quality control

engineer.

2 Overview

The CS470xx DSP is designed to provide high-performance post-processing and mixing of analog and digital audio. Dual

clock domains are supported when the DAI and SPDIF RX inputs are used together. Integrated sample rate converters

(SRCs) allow audio streams with different sample rates to be mixed. The low-power standby preserves battery life for

applications that are always on, but not necessarily processing audio, such as automotive audio systems.

The CS470xx uses voltage-out DACs and is capable of supporting dual input clock domains through the use of the internal

SRCs. The CS470xx is available in a 100-pin LQFP package. Refer to Table 3-1 and Table 3-2 for the input, output, and

firmware configurations for the CS470xx DSP.

2.1 Licensing

Licenses are required for any third-party audio processing algorithms provided for the CS470xx. Contact your local Cirrus

Logic Sales representative for more information.

Document Name Description

CS470xx Data Sheet This document

CS470xx Hardware User’s Manual Guide Includes detailed system design information such as typical connection diagrams, boot-proce-

dures, and pin descriptions

AN333 - CS470xx Firmware User’s Manual Includes a list of firmware modules available on the CS470xx family platform and detailed firm-

ware design information including signal processing flow diagrams and control API information

DSP Composer User’s Manual Includes detailed configuration and usage information for the GUI development tool

CDB470xx User’s Manual Includes detailed instructions on the use of the CDB470xx development board

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3 Code Overlays

The suite of software available for the CS470xx family consists of an operating system (OS) and a library of overlays. The

software components for the CS470xx family include:

1. OS/Kernel—Encompasses all non-audio processing tasks, including loading data from external serial memory,

processing host messages, calling audio-processing subroutines, error concealment, etc.

2. Decoder—Any module that performs a compressed audio decode on IEC61937-packed data delivered via S/PDIF

Rx or I²S input, such as Dolby Digital (AC3).

3. Matrix-processor—Any Module that performs a matrix decode on PCM data to produce more output channels than

input channels (2Æn channels). Examples are Dolby® Pro Logic® IIx and SRS Circle Surround II®. Generally

speaking, these modules increase the number of valid channels in the audio I/O buffer.

4. Virtualizer-processor—Any module that encodes PCM data into fewer output channels than input channels (nÆ2

channels) with the effect of providing “phantom” speakers to represent the physical audio channels that were

eliminated. Examples are Dolby Headphone® 2 and Dolby® Virtual Speaker® 2. Generally speaking, these

modules reduce the number of valid channels in the audio I/O buffer.

5. Post-processors—Any module that processes audio I/O buffer PCM data. Examples are bass management, audio

manager, tone control, EQ, delay, customer-specific effects, and any post-processing algorithms available for the

CS470xx DSP.

The bulk of standard overlays are stored in ROM within the CS470xx, but a small image is required to configure the

overlays and boot the DSP. This small image can either be stored in an external serial flash/EEPROM, or downloaded via

a host controller through the SPI/I²C serial port.

The overlay structure reduces the time required to reconfigure the DSP when a processing change is requested. Each

overlay can be reloaded independently without disturbing the other overlays. For example, when a different post-processor

is selected, the OS, does not need to be reloaded—only the new post-processor.

Table 3-1 lists the different configuration options available. Refer to the CS470xx Firmware User’s Manual for the latest

listing of application codes and Cirrus Framework™ modules available. See Table 3-2, which provides a summary of the

available channels for each type of input and output communication mode for members of the CS470xx family of DSPs.