2

DS308PP4

CS4281

CrystalClear™ PCI Audio Interface

CIRRUS LOGIC PRODUCT DATA SHEET

TABLE OF CONTENTS

CHARACTERISTICS/SPECIFICATIONS- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3

Absolute Maximum Ratings - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3

Recommended Operating Conditions - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3

AC Characteristics (PCI Signal Pins only) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4

DC Characteristics - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 5

PCI Interface Pins - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 6

AC-Link Serial Interface- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 7

EEPROM Timing Characteristics - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 8

OVERVIEW- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 9

Legacy Support - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 9

SYSTEM ARCHITECTURES - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 9

HOST INTERFACE - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 11

PCI Bus Transactions - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 12

Configuration Space - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 12

Subsystem Vendor ID Fields- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 12

Cirrus-Specific Configuration Registers - - - - - - - - - - - - - - - - - - - - - - - - - - - 15

Interrupt Signal - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 20

AC ’97 LINK - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 20

MIDI PORT - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 22

JOYSTICK PORT - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 22

EEPROM INTERFACE - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 23

GENERAL PURPOSE I/O PINS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 23

PIN DESCRIPTION - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 24

PCI Interface - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 26

External Interface Pins - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 27

Clock / Miscellaneous - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 28

Serial Codec Interface - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 29

PACKAGE OUTLINE- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 30

APPENDIX A. MIGRATION FROM A CS4280 DESIGN TO A CS4281 DESIGN - - - - - 32

Contacting Cirrus Logic Support

For a complete listing of Direct Sales, Distributor, and Sales Representative contacts, visit the Cirrus Logic web site at:

http://www.cirrus.com/corporate/contacts/

Preliminary product information describes products which are in production, but for which full characterization data is not yet available. Advance product infor-

mation describes products which are in development and subject to development changes. Cirrus Logic, Inc. has made best efforts to ensure 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). No responsibility is assumed by Cirrus Logic, Inc. for the use of this information, nor for infringements of patents or other rights of third

parties. This document is the property of Cirrus Logic, Inc. and implies no license under patents, copyrights, trademarks, or trade secrets. No part of this publi-

cation may be copied, reproduced, stored in a retrieval system, or transmitted, in any form or by any means (electronic, mechanical, photographic, or otherwise)

without the prior written consent of Cirrus Logic, Inc. Items from any Cirrus Logic website or disk may be printed for use by the user. However, no part of the

printout or electronic files may be copied, reproduced, stored in a retrieval system, or transmitted, in any form or by any means (electronic, mechanical, photo-

graphic, or otherwise) without the prior written consent of Cirrus Logic, Inc.Furthermore, no part of this publication may be used as a basis for manufacture or

sale of any items without the prior written consent of Cirrus Logic, Inc. The names of products of Cirrus Logic, Inc. or other vendors and suppliers appearing in

this document may be trademarks or service marks of their respective owners which may be registered in some jurisdictions. A list of Cirrus Logic, Inc. trade-

marks and service marks can be found at http://www.cirrus.com.

CrystalClear and CCLS are trademarks of Cirrus Logic, Inc.

Windows, Windows 95, Windows 98, and Windows NT are registered trademarks of Microsoft Corporation.

Intel is a registered trademark of Intel Corporation.

Sound Blaster and Sound Blaster Pro are trademarks of Creative Technology, Ltd.

All other names are trademarks, registered trademarks, or service marks of their respective companies.