cs4237b Cirrus Logic, Inc., cs4237b Datasheet - Page 2

• Manufacturer Part Number: cs4237b
• Description: Crystalclear Advanced Audio System With 3d Sound
• Manufacturer: Cirrus Logic, Inc.

CS4237B PERFORMANCE SPECIFICATIONS 3
GENERAL DESCRIPTION ................................. 12
PLUG AND PLAY ............................................... 15
WINDOWS SOUND SYSTEM CODEC .............. 26
SOUND BLASTER INTERFACE........................ 57
GAME PORT INTERFACE ................................. 60
CONTROL INTERFACE ..................................... 61
MPU-401 INTERFACE ........................................ 72
FM SYNTHESIZER (Internal)............................. 73
EXTERNAL PERIPHERAL PORT...................... 74
DSP SERIAL AUDIO DATA PORT.................... 76
CS9236 WAVETABLE SERIAL DATA PORT ... 78
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
The CS4237B incorporates the SRS (Sound Retrieval System) under license from SRS Labs, Inc.
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ISA Bus Interface............................................. 13
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
Enhanced Functions (MODEs)........................ 26
FIFOs ............................................................... 27
WSS Codec PIO Register Interface ................ 27
DMA Interface.................................................. 28
Sound System Codec Register Interface ........ 29
Mode Switching ............................................... 57
Sound Blaster Register Interface .................... 57
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 Register Interface ............................ 72
MIDI UART ...................................................... 73
MPU-401 "UART" Mode Operation ................. 73
Synthesizer Interface ....................................... 74
CDROM Interface ............................................ 75
Modem Interface.............................................. 76
Direct Mapped Registers (R0-R3) ............... 29
Indirect Mapped Registers (I0-I31) .............. 35
WSS Extended Registers (X0-X25) ............ 48
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PROM............................................ 24
are registered trademarks of SRS Labs, Inc.
TABLE OF CONTENTS
WSS CODEC SOFTWARE DESCRIPTION .......79
DIGITAL HARDWARE DESCRIPTION...............87
ANALOG HARDWARE DESCRIPTION .............90
GROUNDING AND LAYOUT ..............................92
POWER SUPPLIES.............................................93
ADC/DAC FILTER RESPONSE..........................95
PIN DESCRIPTIONS ...........................................97
PARAMETER DEFINITIONS...............................108
PACKAGE PARAMETERS .................................109
APPENDIX A: E
APPENDIX B: CS4237B DIFFERENCES...........112
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
Bus Interface ....................................................87
Volume Control Interface .................................87
Crystal/Clock ....................................................88
General Purpose Output Pins ..........................88
Reset and Power Down ...................................89
Multiplexed Pin Configuration...........................89
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
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
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PROM TYPICAL DATA ..........110
CS4237B
DS213PP4