CS4237B datasheet(2/114 Pages) CIRRUS

2 / 114 page

TABLE OF CONTENTS

CS4237B PERFORMANCE SPECIFICATIONS 3

GENERAL DESCRIPTION ................................. 12

ISA Bus Interface............................................. 13

PLUG AND PLAY ............................................... 15

PnP Data ......................................................... 16

Loading Resource Data................................... 17

Loading Firmware Patch Data......................... 17

The Crystal Key ............................................... 18

Bypassing Plug and Play................................. 19

Hardware Configuration Data .......................... 20

Hostload Procedure ......................................... 24

External E

2PROM............................................ 24

WINDOWS SOUND SYSTEM CODEC .............. 26

Enhanced Functions (MODEs) ........................ 26

FIFOs ............................................................... 27

WSS Codec PIO Register Interface ................ 27

DMA Interface.................................................. 28

Sound System Codec Register Interface ........ 29

Direct Mapped Registers (R0-R3) ............... 29

Indirect Mapped Registers (I0-I31) .............. 35

WSS Extended Registers (X0-X25) ............ 48

SOUND BLASTER INTERFACE........................ 57

Mode Switching ............................................... 57

Sound Blaster Register Interface .................... 57

GAME PORT INTERFACE ................................. 60

CONTROL INTERFACE ..................................... 61

Control Register Interface................................ 61

Control Indirect Registers (C0-C8) .................. 65

SRS 3D Sound Overview ................................ 68

Hearing Basics................................................. 69

The SRS 3D Stereo Process .......................... 69

SRS Space Control ......................................... 69

SRS Center Control......................................... 70

SRS Mono-to-Stereo Synthesis....................... 71

Consumer IEC-958 Digital Output ................... 71

MPU-401 INTERFACE ........................................ 72

MPU-401 Register Interface ............................ 72

MIDI UART ...................................................... 73

MPU-401 "UART" Mode Operation ................. 73

FM SYNTHESIZER (Internal)............................. 73

EXTERNAL PERIPHERAL PORT...................... 74

Synthesizer Interface ....................................... 74

CDROM Interface ............................................ 75

Modem Interface.............................................. 76

DSP SERIAL AUDIO DATA PORT.................... 76

CS9236 WAVETABLE SERIAL DATA PORT ... 78

WSS CODEC SOFTWARE DESCRIPTION .......79

Calibration ........................................................79

Changing Sampling Rate .................................80

Changing Audio Data Formats.........................81

Audio Data Formats .........................................81

DMA Registers .................................................85

Digital Loopback...............................................86

Timer Registers ................................................86

WSS Codec Interrupt .......................................86

Error Conditions ...............................................87

DIGITAL HARDWARE DESCRIPTION...............87

Bus Interface ....................................................87

Volume Control Interface .................................87

Crystal/Clock ....................................................88

General Purpose Output Pins ..........................88

Reset and Power Down ...................................89

Multiplexed Pin Configuration...........................89

ANALOG HARDWARE DESCRIPTION .............90

Line-Level Inputs Plus MPC Mixer...................90

Microphone Level Inputs ..................................91

Mono Input .......................................................91

Line-Level Outputs ...........................................92

Mono Output with Mute Control .......................92

Miscellaneous Analog Signals..........................92

GROUNDING AND LAYOUT ..............................92

POWER SUPPLIES.............................................93

ADC/DAC FILTER RESPONSE..........................95

PIN DESCRIPTIONS ...........................................97

ISA Bus Interface Pins .....................................98

Analog Inputs ...................................................99

Analog Outputs.................................................100

MIDI Interface...................................................101

External FM Synthesizer Interface ...................101

External Peripheral Port ...................................101

Joystick/DSP Serial Port Interface ...................103

CS9236 Wavetable Serial Port Interface .........104

CDROM Interface.............................................105

Volume Control.................................................106

Miscellaneous ...................................................106

Power Supplies ................................................107

PARAMETER DEFINITIONS...............................108

PACKAGE PARAMETERS .................................109

APPENDIX A: E

2PROM TYPICAL DATA ..........110

APPENDIX B: CS4237B DIFFERENCES...........112

CS4237B

DS213PP4

Windows and Windows Sound System are registered trademarks of Microsoft Corporation.

Sound Blaster and Sound Blaster Pro are registered trademarks of Creative Labs.

Adlib is a registered trademark of Adlib Corporation.

The word SRS and the SRS Symbol

are registered trademarks of SRS Labs, Inc.

The CS4237B incorporates the SRS (Sound Retrieval System) under license from SRS Labs, Inc.

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